Colin Sayers

Publications

Sayers, C.M., 2021. Mechanical properties of grain contacts in unconsolidated sands. Geophysics, 86(2), pp.1-39.

Sayers, C.M. and den Boer, L.D., 2020. Effect of variations in microstructure on clay elastic anisotropy. Geophysics, 85(2), pp.MR73-MR82.

Sayers, C.M. and den Boer, L.D., 2020. Fracture characterization from seismic data in the presence of multiple vertical fracture sets. In SEG Technical Program Expanded Abstracts 2020 (pp. 2206-2210). Society of Exploration Geophysicists.

Sayers, C.M. and den Boer, L.D., 2019. The impact of different clay minerals on the anisotropy of clay matrix in shale. Geophysical Prospecting, 67(9), pp.2298-2318.

Sayers, C.M., Dasgupta, S., Koesoemadinata, A. and Shoemaker, M., 2019. Rock physics of the Wolfcamp Formation, Delaware Basin. Geophysics, 84(6), pp.1-41.

Sayers, C.M., Dasgupta, S., den Boer, L.D., Gofer, E., Lascano, M., Paddock, D., Sudhakar, V. and Walz, A., 2019. Seismic inversion for engineering applications in unconventional reservoirs. In SEG Technical Program Expanded Abstracts 2019 (pp. 4740-4744). Society of Exploration Geophysicists.

Sayers, C.M., den Boer, L.D., Koesoemadinata, A., Gofer, E. and Shoemaker, M., 2019. Fracture characterization in the Delaware Basin using wide-azimuth seismic data. In SEG Technical Program Expanded Abstracts 2019 (pp. 3225-3229). Society of Exploration Geophysicists.

Sayers, C.M. and den Boer, L.D., 2019, October. Pore-Pressure Prediction in the Permian Basin Using Seismic Prestack Inversion. In Unconventional Resources Technology Conference, Denver, Colorado, 22-24 July 2019 (pp. 2170-2180). Unconventional Resources Technology Conference (URTeC); Society of Exploration Geophysicists.

Sayers, C.M. and Dasgupta, S., 2019. A predictive anisotropic rock-physics model for estimating elastic rock properties of unconventional shale reservoirs. The Leading Edge, 38(5), pp.358-365.

Sayers, C.M. and den Boer, L.D., 2019. Elastic anisotropy of clay in shales. In SEG Technical Program Expanded Abstracts 2019 (pp. 3528-3532). Society of Exploration Geophysicists.

den Boer, L.D. and Sayers, C.M., 2018. Constructing a discrete fracture network constrained by seismic inversion data. Geophysical Prospecting, 66(1), pp.124-140.

Sayers, C.M. and Dasgupta, S., 2018. Rock physics of unconventional reservoirs. In SEG Technical Program Expanded Abstracts 2018 (pp. 3598-3602). Society of Exploration Geophysicists.

Sayers, C.M. and den Boer, L.D., 2018. The Elastic Properties of Clay in Shales. Journal of Geophysical Research: Solid Earth, 123(7), pp.5965-5974.

Kumar, R., Bansal, P., Al-Mal, B.S., Dasgupta, S., Sayers, C., David Ng, P.H., Walz, A., Hannan, A., Gofer, E. and Wagner, C., 2018. Seismic data conditioning and orthotropic rock-physics-based inversion of wide-azimuth P-wave seismic data for fracture and total organic carbon characterization in a north Kuwait unconventional reservoir. Geophysics, 83(4), B229-B240.

Sayers, C.M., 2018. Increasing contribution of grain boundary compliance to polycrystalline ice elasticity as temperature increases. Journal of Glaciology, 64(246), pp.669-674.

Sayers, C.M., 2018. Elastic anisotropy of polycrystalline ice with transversely isotropic and orthotropic symmetry. Geophysical Journal International, 215(1), pp.155-164.

den Boer, L., Sayers, C., Gofer, E., Lascano, M., Walz, M., Dasgupta, S., Purdue, G. and Goodway, W., 2017. Characterization of fluid-flow anisotropy in a carbonate reservoir using AVAZ inversion of wide-azimuth seismic data. In SEG Technical Program Expanded Abstracts 2017 (pp. 3012-3016). Society of Exploration Geophysicists.

Sayers, C. and Dasgupta, S., 2017. Rock physics of the Wolfcamp formation, Delaware Basin. In SEG Technical Program Expanded Abstracts 2017 (pp. 3653-3659). Society of Exploration Geophysicists.

Sayers, C.M., 2017, November. Seismic Inversion for Engineering Applications in Unconventional Reservoirs. In First EAGE/AMGP/AMGE Latin-American Seminar in Unconventional Resources.

C.M. Sayers, M. Lascano, E. Gofer, L. Den Boer, M. Walz, A. Hannan, S. Dasgupta, W. Goodway, M. Perez and G. Purdue (2016) Geomechanical model for the Horn River Formation based on seismic AVA inversion, 86th SEG Annual Meeting, Expanded Abstracts.

R. Kumar, P. Bansal, B. Al-Mal, S. Dasgupta, C. Sayers, P. Ng, A. Hannan, E. Gofer, M. Walz and C. Wagner (2016) Orthotropic rock-physics based inversion for fracture and total organic carbon (TOC) characterization from azimuthal P-wave seismic survey: Case study from a northern Kuwait unconventional reservoir, 86th SEG Annual Meeting, Expanded Abstracts.

R. Kumar, T. Al-Mutairi, P. Bansal, S. Dasgupta, C. Sayers, P. Ng, A. Hannan, E. Gofer, C. Wagner, M. Walz (2016) Seismic data conditioning for AVOA analysis: Case study from a north Kuwait unconventional reservoir, 86th SEG Annual Meeting, Expanded Abstracts.

C.M Sayers and L.D. den Boer (2016) The elastic anisotropy of clay minerals, Geophysics, 81, C193-C203.

Ahmadi, M., A. Dahi Taleghani, and Sayers, C.M. (2016) The effects of roughness and offset on fracture compliance ratio, Geophysical Journal International, 205, 454-463.

C.M. Sayers, M. Hirao and T. Morishita (2016) Grain boundary compliance and ultrasonic velocities in pure copper undergoing intergranular creep, Int. J. Solids and Structures, 96, 400–408.

Da Silva, J.A., and C.M. Sayers (2015) AVAZ interpretation using anisotropic rock physics, 85th SEG Annual Meeting, Expanded Abstracts.

Sayers, C.M., K. Fisher and J.J. Walsh (2015) Rock physics of the Eagle Ford Shale, 85th SEG Annual Meeting, Expanded Abstracts.

Sayers, C., L. den Boer, S. Dasgupta, and B. Goodway (2015) Anisotropy estimate for the Horn River Basin from sonic logs in vertical and deviated wells, The Leading Edge, 34, 296-306.

Sayers, C.M., S. Guo, and J. Silva (2015) Sensitivity of the elastic anisotropy and seismic reflection amplitude of the Eagle Ford Shale to the presence of kerogen, Geophys. Prosp. 63, 151-165.

Bachrach, R., C.M. Sayers, J Da Silva, and S. Dasgupta (2014) Recent advances in the characterization of unconventional reservoirs with wide-azimuth seismic data, 84th SEG Annual Meeting, Expanded Abstracts.

Sayers, C.M., J.J. Walsh, and K. Fisher (2014) Sonic anisotropy of the Lower Eagle Ford Shale, 84th SEG Annual Meeting, Expanded Abstracts.

Sayers, C.M., and L. den Boer (2014) Shale anisotropy and the elastic anisotropy of clay minerals, 84th SEG Annual Meeting, Expanded Abstracts.

Bachrach, R., C.M. Sayers, S. Dasgupta, and J Da Silva (2014) Seismic reservoir characterization for unconventional reservoirs using orthorhombic AVAZ attributes and stochastic rock physics modeling, 84th SEG Annual Meeting, Expanded Abstracts.

Sayers, C.M., and S. Dasgupta (2014) Elastic anisotropy of the Middle Bakken formation, 84th SEG Annual Meeting, Expanded Abstracts.

Ahmadi, M., A. Dahi Taleghani, and Sayers, C.M. (2014) Direction dependence of fracture compliance induced by slickensides, Geophysics, 79, C91-C96.

Sayers, C.M. (2013). "The effect of kerogen on the AVO response of organic-rich shales." The Leading Edge, 32(12), 1514-1519.

Nagy, Z.R., D.W. Lee, C.M. Sayers, T.R. Zapata and J.L. Silvestro (2013) Iterative 3D Geomechanical Modeling to Determine Distribution and Impact of Stresses in Deepwater Gulf of Mexico Subsalt and Near-Salt Environments. ARMA-2013-527, 47th U.S. Rock Mechanics/Geomechanics Symposium, 23-26 June, San Francisco, California.

Bachrach, R., Sayers, C.M., Dasgupta, S., Silva, J., and Volterrani, S. (2013) Recent Advances in the Characterization of Unconventional Reservoirs with Wide-Azimuth Seismic Data. Unconventional Resources Technology Conference, Denver, Colorado, 12-14 August 2013: pp. 263-272.

Sayers, C.M. (2013) The effect of kerogen on the elastic anisotropy of organic-rich shales, Geophysics, 78, N1–N10.

Far, M.E., L. Thomsen and C.M. Sayers (2013) Seismic characterization of reservoirs with asymmetric fractures, Geophysics, 78, D65–D74.

Sayers, C.M. (2013) The effect of anisotropy on the Young's moduli and Poisson's ratios of shales, Geophys. Prosp., 61, 416–426.

Far, M.E., C.M. Sayers, L. Thomsen, D. Han, and J.P. Castagna (2013) Seismic characterization of naturally fractured reservoirs using amplitude versus offset and azimuth analysis, Geophys. Prosp., 61, 427–447.

Sayers, C.M., and L.D. den Boer (2012) Characterizing production-induced anisotropy of fractured reservoirs having multiple fracture sets, Geophys. Prosp., 60, 919–939.

Far, M.E., L. Thomsen and C.M. Sayers (2012) Inversion for asymmetric fracture parameters using synthetic AVOA data, 82nd SEG Annual Meeting, Expanded Abstracts.

Adachi J., Z.R. Nagy, C.M. Sayers, M. Smith and D.F. Becker (2012) Drilling Adjacent to Salt Bodies: Definition of Mud Weight Window and Pore Pressure Using Numerical Models and Fast Well Planning Tool , SPE-159739, SPE Annual Technical Conference and Exhibition, 8-10 October, San Antonio, Texas.

Sayers, CM, and L.D. den Boer (2011) Rock physics-based relations for density and S-velocity versus P-velocity in deepwater subsalt Gulf of Mexico shales, The Leading Edge, December 2011, 30 1376-1381.

Sayers, C.M. and L.D. den Boer (2011) Velocity-density relations for deepwater subsalt Gulf of Mexico shales, 81st SEG Annual Meeting, Expanded Abstracts.

Eftekharifar, M. and C.M. Sayers (2011) Seismic characterization of fractured reservoirs: A resolution matrix approach, 81st SEG Annual Meeting, Expanded Abstracts.

Eftekharifar, M. and C.M. Sayers (2011) Seismic characterization of fractured reservoirs: Inversion for fracture parameters illustrated using synthetic AVOA data, 81st SEG Annual Meeting, Expanded Abstracts.

L.D. den Boer, C.M. Sayers, S. Noeth, A. Hawthorn, P.J. Hooyman, and M.F. Smith (2011) Using Tomographic Seismic Velocities to Understand Subsalt Overpressure Drilling Risks in the Gulf of Mexico, OTC 21546, presented at the 2011 Offshore Technology Conference held in Houston, 2-5 May 2011.

Sayers, C.M,. and S. Noeth (2010) Sensitivity of velocities to overpressure within heterogeneous tight gas sand reservoirs, The Leading Edge, December 2010, 29, 1490-1493.

Sayers, C.M. and J. Le Calvez (2010) Characterization of microseismic data in gas shales using the radius of gyration tensor, 80th SEG Annual Meeting, Extended Abstracts.

Sayers, C.M. (2010) The effect of anisotropy on the Young's moduli and Poisson's ratios of shales, 80th SEG Annual Meeting, Extended Abstracts.

Horne, S., J. Walsh and C.M. Sayers (2010) Dipole sonic log calibration using walkaway VSP data, 80th SEG Annual Meeting, Extended Abstracts.

Sayers, C.M. (2010) Geophysics Under Stress: Geomechanical Applications of Seismic and Borehole Acoustic Waves: 2010 Distinguished Instructor Short Course, Society of Exploration Geophysicists, ISBN 1560802103

Sayers, C.M. (2009) Seismic characterization of reservoirs containing multiple fracture sets, Geophys. Prosp., 57, 187-192.

Sayers, C.M. (2009) The sensitivity of seismic waves to the normal and shear compliance of fractures, SEG, Expanded Abstracts, 28 3441-3445.

Sayers, C.M., Z. Nagy, J. Adachi, V. Singh, K. Tagbor, and P. Hooyman (2009) Determination of in-situ stress and rock strength using borehole acoustic data, SEG, Expanded Abstracts, 28, 3505-3509.

C.M. Sayers, C.L. Russell, M. Pelorosso, J. Adachi, J.S. Pastor, V. Singh, K.M. Tagbor, and P.J. Hooyman (2009) Calibrating the mechanical properties and in-situ stresses using acoustic radial profiles, SPE 124161.

G. Han, K.S. Shepstone, I.S. Harmawan, U. Er, H. Jusoh, L.S. Lin, R. Koya, S. Carney, L.D. Barker, D. Pringle, N. Morita, E. Papamichos, P. Cerasi, C.M. Sayers, J.C. Heiland, M.S. Bruno and J. Diessl (2009) A Comprehensive Study of Sanding Rate From Gas Field: From Reservoir, Completion, Production, to Surface Facilities, SPE 123478.

Sayers, C.M., Dahi Taleghani, A, and Adachi, J (2009) The effect of mineralization on the ratio of normal to tangential compliance of fractures, Geophys. Prosp., 57, 439-446.

Zhang, Y, Sayers, C.M., and Adachi, JI (2009) The use of effective medium theories for seismic wave propagation and fluid flow in fractured reservoirs under applied stress, Geophys. J. Int., 177, 205 - 221.

Smith, T.M., Sayers, C.M,. and Sondergeld, C.H. (2009) Rock properties in low-porosity/low-permeability sandstones, The Leading Edge, January 2009, 28, 48-59.

Sayers, CM (2008) The effect of low aspect ratio pores on the seismic anisotropy of shales, SEG, Expanded Abstracts, 27, 2750-2754.

Sayers, CM, Adachi, J, and Dahi Taleghani, A (2008) The effect of near-wellbore yield on elastic wave velocities in sandstones, SEG, Expanded Abstracts, 339-343.

Zhang, Y, Sayers, CM, and Adachi, J (2008) The use of effective medium theories for seismic wave propagation and fluid flow in fractured reservoirs under applied stress, SEG, Expanded Abstracts, 27, 2932-2936.

Sayers, CM (2008) The elastic properties of carbonates, The Leading Edge, 27, 1020-1024.

Cook, J, Frederiksen, RA, Hasbo, K, Green, S, Judzis, A, Martin, JW, Suarez-Rivera, R, Herwanger, J, Hooyman, P, Lee, D, Noeth, S, Sayers, C, Koutsabeloulis, N, Marsden, R, Stage, MG, and Tan, CP, (2007), Rocks Matter: Ground Truth in Geomechanics, Oilfield Review, Autumn 2007, pp 36-55.

Sayers, C.M., Kisra, S., Tagbor, K., Dahi Taleghani, A. and Adachi, J. (2007) Calibrating the mechanical properties and in-situ stresses using acoustic radial profiles, SPE 110089.

Sayers, CM (2007) Seismic characterization of reservoirs containing multiple fracture sets, SEG, Expanded Abstracts, 26, 1456-1460.

Sayers, C.M. (2007) Effects of borehole stress concentration on elastic wave velocities in sandstones, Int. J. Rock Mech., 44, 1045-1052.

Sayers, C.M. (2007) Asymmetry in the time-lapse seismic response to injection and depletion. Geophysical Prospecting, 55, 699-705.

Galvin, R., Gurevich, B. and Sayers, C.M. (2007) Fluid-dependent shear-wave splitting in a poroelastic medium with conjugate fracture sets, Geophysical Prospecting, 55, 333-343.

Sayers, CM, and Schutjens, PMTM (2007), An introduction to reservoir geomechanics, The Leading Edge, 26, 597-601.

Bachrach, R., Noeth, S., Banik, N., Sengupta, M., Bunge, G., Flack, B., Utech, R., Sayers, C., Hooyman, P., den Boer, Leu, L., Troyer, B., and Moore, J. (2007) From pore pressure prediction to reservoir characterization: A combined geomechanics-seismic inversion workflow using trend-kriging techniques in a deep-water basin, The Leading Edge, 26, 590-595.

Sayers, CM, den Boer, LD, Nagy, ZR, and Hooyman, PJ (2006), Well-constrained seismic estimation of pore pressure with uncertainty, The Leading Edge, 25, 1524-1526.

D. Doornhof, TG Kristensen, NB Nagel, PD Pattillo & C Sayers (2006) Compaction and Subsidence, Oilfield Review 18, no 3 (Autumn 2006): 50 - 68.

Tollefsen, E, Goobie, RB, Noeth, S, Sayers, C, den Boer, L, Hooyman, P, Akinniranye, G, Cooke, J, Thomas,R and Carter, E (2006) Optimize Drilling and Reduce Casing Strings Using Remote Real-Time Well Hydraulic Monitoring, SPE 103936, presented at the First International Oil Conference and Exhibition in Mexico, 31 August-2 September, Cancun, Mexico.

Sayers, C, den Boer, L, Lee, D, Hooyman, P, and Lawrence, R (2006) Predicting Reservoir Compaction and Casing Deformation in Deepwater Turbidites Using a 3D Mechanical Earth Model, SPE 103926, presented at the First International Oil Conference and Exhibition in Mexico, 31 August-2 September, Cancun, Mexico.

Sayers, CM, den Boer, LD, Nagy, ZR, and Hooyman, PJ (2006), Well-constrained seismic estimation of pore pressure with uncertainty, SEG, Expanded Abstracts, 25, 1530-1534.

Sayers, CM (2006) Effects of borehole stress concentration on elastic wave velocities in sandstones, SEG, Expanded Abstracts, 25, 329-333.

Sayers, CM (2006), Time-lapse seismic response to injection and depletion, SEG, Expanded Abstracts, 25, 3195-3199.

Noeth, S., Sayers, C.M., Hooyman, P.J., den Boer, L., Banik, N., Bachrach, R., Bunge, G., Utech, R., Leu, L. and Moore, J. (2006): Trend-kriged seismic velocities to predict pore pressure and model effective stress for reservoir characterization in a deepwater basin, SEG, Expanded Abstracts, 25, 1535-1539.

Sayers, C.M (2006), An introduction to velocity-based pore pressure prediction, The Leading Edge, 25, 1496-1500.

Sayers, C.M. (2006) Sensitivity of time-lapse seismic to reservoir stress path. Geophysical Prospecting, 54, 369-380.

den Boer, LD, Sayers, CM,. Nagy, ZR, Hooyman, PJ, and Woodward, MJ (2006) Pore pressure prediction using well-conditioned seismic velocities, First Break, Vol. 24, pp 43-50.

Sayers, C.M. (2006) Sensitivity of elastic wave velocities to reservoir stress changes caused by production, paper ARMA/USRMS 06-1048 presented at Golden Rocks 2006, the 41st U.S. Symposium on Rock Mechanics (USRMS), Golden, Colorado, June 17-21, 2006.

Alford, J, Goobie, RB, Sayers, CM, Tollefsen, E, Cooke, J, Hawthorn, A, Rasmus, JC, and Thomas, R, 2006, A sound approach to Drilling, Oilfield Review, Winter 2005/2006, pp 68-78.

Sayers, CM (2005) Sensitivity of elastic-wave velocities to stress changes in sandstones, The Leading Edge, 24, 1262-1266.

Barriol, Y, Glaser, KS, Pop, J, Bartman, B, Corbiell, R, Eriksen, KO, Laastad, H, Laidlaw, J, Manin, Y, Morrison, K, Sayers, CM, Romero, MT, and Volokitin, Y, 2005, The Pressures of Drilling and Production, Oilfield Review, Autumn 2005, pp 22-41.

Sayers, CM,. den Boer, L, Nagy, Z, Hooyman, P, and Ward, V (2005) Pore pressure in the Gulf of Mexico: Seeing ahead of the bit, World Oil, Vol. 226 No. 12, pp 55-58.

Sayers, CM (2005), Sensitivity of elastic wave velocities to reservoir stress path, 75th SEG Annual Meeting, Extended Abstracts, 2492-2495.

Sayers, CM, den Boer, LD, Nagy, ZR, Hooyman, PJ, and Ward, V (2005), Regional trends in undercompaction and overpressure in the Gulf of Mexico, SEG, Expanded Abstracts, 24, 1219-1222.

Nagy, Z.R., Elisabeth, F., Sayers, C.M., Valleau, D. and Berkovski, D. (2005) Understanding the geomechanics risk. E&P, vol 78, issue 10, p. 69-70.

Sayers, C.M. (2005) Seismic anisotropy of shales. Geophysical Prospecting, 53, 667-676.

Sayers, C. M. (2005) Seismic Anisotropy of Shales - What Determines the Sign of Thomsen's Delta Parameter?, 67th Mtg.: Eur. Assn. Geosci. Eng., E044.

Sayers, CM, den Boer, LD, Nagy, ZR, Hooyman, PJ and Ward, V (2005), Regional Trends in Undercompaction as a Predictor of Shallow Water Flow and Overpressure in the Deepwater Gulf of Mexico, Eos. Trans. AGU, 86(18), Jt. Assem. Suppl., Abstract NS13A-06.

Smit, D. and Sayers, C.M. (2005) Can tidal-driven pressure changes reveal reservoir properties for use in 4D monitoring? World Oil, March 2005, 37-43.

Malinverno, A., Sayers, C.M. , Woodward, M.J. and Bartman, R.C. (2004) Integrating diverse measurements to predict pore pressure with uncertainties while drilling, SPE 90001, presented at the SPE Annual Technical Conference and Exhibition held in Houston, Texas, 26-29 September 2004.

Sayers, C.M. (2004) Monitoring production-induced stress changes using seismic waves, 74th SEG Annual Meeting, Extended Abstracts, 2287-2290.

Smit, D.-J. and Sayers, C.M. (2004) Tidal-driven constraints for time-lapse reservoir monitoring, 74th SEG Annual Meeting, Extended Abstracts, 1559-1562.

Sayers, C.M. (2004) Seismic anisotropy of shales: What determines the sign of Thomsen’s delta parameter? 74th SEG Annual Meeting, Extended Abstracts, 103-106.

Sayers, C.M. (2004) Inversion of elastic wave velocity measurements for monitoring changes in rock stress resulting from production, paper ARMA/NARMS 04-473 presented at Gulf Rocks 2004, the 6th North America Rock Mechanics Symposium (NARMS), Houston, Texas, June 5-9, 2004.

Galvin, R., Gurevich, B. and Sayers, C.M. (2004) Fluid-dependent shear-wave splitting in a poroelastic medium with conjugate fracture sets, 66th EAGE Conference, Paris, France, 7-10 June 2004, Extended Abstracts, Paper A-06.

Sayers, C.M., Smit, T.J.H., van Eden, C., Wervelman, R., Bachmann, B., Fitts, T., Bingham, J., McLachlan, K., Hooyman, P., Noeth, S. and Mandhiri, D. (2003) Use of reflection tomography to predict pore pressure in overpressured reservoir sands, 73rd SEG Annual Meeting, Extended Abstracts, 1362-1365.

Doyen, P.M. , Malinverno, A., Prioul, R., Hooyman, P., Noeth, S., den Boer, L., Psaila, D., Sayers, C.M. and Smit, T.J.H. (2003) Seismic pore pressure prediction with uncertainty using a probabilistic mechanical earth model, 73rd SEG Annual Meeting, Extended Abstracts, 1366-1369.

Hatchell, P.J., van den Beukel, A., Molenaar, M.M., Maron, K.P., Kenter, C.J., Stammeijer, J.G.F., van der Velde, J.J., and Sayers, C.M. (2003) Whole earth 4D: monitoring geomechanics, 73rd SEG Annual Meeting, Extended Abstracts, 1330-1333.

Sayers, C.M., D.-H. Han (2002) The effect of pore fluid on the stress-dependent elastic wave velocities in sandstones, 72nd SEG Annual Meeting, Extended Abstracts.

Sayers, C.M., Hooyman, P.J., Smirnov, N., Fiume, G., Prince, A., de Leon Mojarro, J.C., Terrazas Romero, M. and Gonzalez, O.M. (2002) Pore Pressure Prediction for the Cocuite Field, Veracruz Basin, SPE 77360, presented at the SPE Annual Technical Conference and Exhibition held in San Antonio, Texas, 29 September-2 October 2002.

Sayers, C.M., Johnson, G.M. and Denyer, G. (2002) Pre-drill Pore Pressure Prediction Using Seismic Data, Geophysics, 67, 1286-1292.

Sayers, C.M. (2002) Fluid-dependent shear-wave splitting in fractured media. Geophysical Prospecting, 50, 393-401.

Sayers, C.M. (2002) Stress-dependent elastic anisotropy of sandstones, Geophysical Prospecting, 50-85-95.

Sayers, C.M., Woodward, M.J. and Bartman, R.C. (2002) Seismic pore-pressure prediction using reflection tomography and 4C seismic data, The Leading Edge, 21, 188-192.

Sayers, C.M., Woodward, M.J. and Bartman, R.C. (2001) Predrill pore-pressure prediction using 4-C seismic data, The Leading Edge, 20, 1056-1059.

Sayers, C.M. and Woodward, M.J. (2001) Predrill pore-pressure prediction using 4-C seismic data, 71st SEG Annual Meeting, Extended Abstracts, paper MC 1.6.

Sayers, C.M. and Dean, S.(2001) Azimuth-dependent AVO in reservoirs containing non-orthogonal fracture sets, Geophysical Prospecting, 49, 100-106.

Sayers, C.M and Woodward, M.J. (2001) Enhanced seismic pore pressure prediction, OTC 13044, presented at the 2001 Offshore Technology Conference held in Houston, 30 April - 3 May 2001.

Badri, M.A., Sayers, C., Hussein, R.A. and Graziano, A. (2001) Pore pressure prediction data using seismic velocities and log data in the offshore Nile Delta, Egypt, SPE 68195, presented at the 2001 Middle East Oil Show held in Bahrain, 17-20 March 2001.

Badri, M.A., Sayers, C.M., Awad, R. and Graziano, A. (2000) A feasibility study for pore-pressure prediction using seismic velocities in the offshore Nile Delta, Egypt, The Leading Edge, 19, 1103-1108.

Sayers, C.M., Johnson, G.M. and Denyer, G. (2000) Predrill Pore Pressure Prediction Using Reflection Tomography, 70th SEG Annual Meeting, Extended Abstracts, paper INT 1.7.

Jenkerson, M.R., Houck, R., Walsh, M., Combee, L., Curtis. A., Martin, J., Moldoveanu, N., Ozbek, A., Sayers, C. and Walker, R. (2000) Signal Preserving Swell Noise Attenuation Using Point Receiver Data, 70th SEG Annual Meeting, Extended Abstracts, paper SP 6.4.

Cuvillier, G., Edwards, S., Johnson, G., Plumb, D., Sayers, C.M., Denyer, G., Mendonca, J.E., Theuveny, B. and Vise, C. (2000) Solving Deepwater Well-Construction Problems, Oilfield Review, 12, 2-17.

Robertsson, J.O.A., Ryan-Grigor, S., Sayers, C.M. and Chapman, C.H. (2000) A finite difference injection approach to modeling seismic fluid flow monitoring, Geophysics, 65, 896-906.

Ryan-Grigor, S. and Sayers, C.M. (2000) Sensitivity of reflection seismic data to oil-column height in high-porosity sandstones, Geophysical Prospecting, 48, 189-207.

Sayers, C.M., Johnson, G.M. and Denyer, G. (2000) Pore Pressure Prediction From Seismic Tomography, OTC 11984, presented at the 2000 Offshore Technology Conference held in Houston, 1-4 May 2000.

Robertsson, J.O.A., Ryan-Grigor, S., Sayers, C.M. and Chapman, C.H. (2000). A finite difference injection approach to modeling seismic fluid flow monitoring, OTC 12133 presented at the 2000 Offshore Technology Conference held in Houston, 1-4 May 2000.

Sayers, C.M., Johnson, G.M. and Denyer, G. (2000) Predrill Pore Pressure Prediction Using Seismic Data, IADC/SPE 59122, presented at the 2000 IADC/SPE Drilling Conference held in New Orleans, 23-25 February 2000.

Leaney, W.S., Sayers, C.M. and Miller, D.E. (1999) Analysis of multiazimuthal VSP data for anisotropy and AVO, Geophysics, 64, 1172-1180.

Schoenberg, M.A., Dean, S. and Sayers, C.M. (1999) Azimuth-dependent tuning of seismic waves reflected from fractured reservoirs, Geophysics, 64, 1160-1171.

Sayers, C.M. (1999) Anisotropic velocity analysis using mode-converted S-waves, J. Seis. Expl., 8, 1-14.

Sayers, C.M. (1999) Stress-dependent seismic anisotropy of shales, Geophysics, 64, 93-98.

Robertsson, J.O.A., Ryan-Grigor, S., Sayers, C.M. and Chapman, C.H. (1999) A finite difference injection approach to modeling seismic fluid flow monitoring,69th SEG Annual Meeting, Extended Abstracts, 1691-1694.

Sayers, C.M. and Johns, A. (1999) Anisotropic velocity analysis using 4C seismic data, 69th SEG Annual Meeting, Extended Abstracts, 780-783.

Sayers, C.M. (1998) Misalignment of the orientation of fractures and the principal axes for P- and S-waves in rocks containing multiple non-orthogonal fracture sets, Geophysics J. Int, 133, 459-466.

Sayers, C.M. (1998) Long-wave seismic anisotropy of heterogeneous reservoirs, Geophysics J. Int, 132, 667-673.

Horne, S.A., McGarrity, J.P., Sayers, C.M., Smith, R.L. and Wijnands, F. (1998) Fractured reservoir characterisation using multi-azimuth walkaway VSPs , 68th SEG Annual Meeting, Extended Abstracts, Paper ST 7.5, 1640-1643.

Sayers, C.M. and Ebrom, D.A. (1997) Seismic traveltime analysis for azimuthally anisotropic media: Theory and experiment, Geophysics, 62, 1570-1582.

Soenneland, L., Hafslund Veire, H., Reymond, B., Signer, C., Pedersen, L., Ryan, S. and Sayers, C. (1997) Seismic reservoir monitoring on Gullfaks, Leading Edge, 16, 1247-1252.

Sayers, C.M. (1997) Determination of anisotropic velocity models from walkaway VSP data acquired in the presence of dip, Geophysics, 62, 723-729.

Sayers, C.M. and Rickett, J.E. (1997) Azimuthal variation in AVO response for fractured gas sands, Geophysical Prospecting, 45, 165-182.

Sayers, C.M. and Ebrom, D.A. (1997) Seismic traveltime analysis for azimuthally anisotropic media, 67th SEG Annual Meeting, Extended Abstracts, 1238-1241.

Pedersen, L., Ryan, S., Sayers, C., Soenneland, L. and Hafslund Veire, H. (1996) Seismic snapshots for reservoir monitoring, Oilfield Review, 8, 32-43. Translation appeared also in Russian and Japanese editions.

Schutjens, P.M.T.H., de Ruig, H., Sayers, C.M., van Munster, J.G. and Whitworth, J.L. (1996) Production-induced compaction of the Brent field: An experimental approach, SPE Formation Evaluation, June 1996, 99-108.

Schoenberg, M., Muir, F. and Sayers, C. (1996) Introducing ANNIE: A simple three-parameter anisotropic velocity model for shales, J. Seis. Expl., 5, 35-49.

Leaney, W.S., Miller, D.E. and Sayers, C.M. (1995) Fracture-induced anisotropy and multi-azimuthal walkaways, 3rd SEGJ/SEG International Symposium, 8 - 10 November 1995, Extended Abstracts, 424-432.

Sayers, C.M. (1995) Simplified anisotropy parameters for transversely isotropic sedimentary rocks, Geophysics, 60, 1933-1935.

Sayers, C.M. (1995) Reflection moveout in azimuthally anisotropic media, 65th SEG Annual Meeting, Houston, 8 - 13 October 1995, Extended Abstracts, Paper IN3.3, 340-343.

Sayers, C.M. (1995) Stress-dependent seismic anisotropy of shales, 65th SEG Annual Meeting, Extended Abstracts, Paper RP2.1, 902-905.

Sayers, C.M. (1995) Anisotropic velocity analysis, Geophysical Prospecting, 43, 541-568.

Sayers, C.M. (1995) Stress-dependent elastic wave velocities in shales, Int. J. Rock Mech., 32, 263-267.

Sayers, C.M. (1995) Stress-dependent elastic wave velocities in shales, 57th EAGE Conference, Glasgow, 29 May - 2 June 1995, Extended Abstracts, Paper B001.

Sayers, C.M. and Kachanov, M. (1995) Microcrack-induced elastic wave anisotropy of brittle rocks, J. Geophys. Res. B, 100, 4149-4156.

Schoenberg, M. and Sayers, C.M. (1995) Seismic anisotropy of fractured rock, Geophysics, 60, 204-211.

Armstrong, P., Ireson, R., Chmela, W., Dodds, K., Esmersoy, C., Miller, D., Hornby, B., Sayers, C. Schoenberg, M., Leaney, S. and Lynn, H. (1994) The promise of seismic anisotropy, Oilfield Review, 6, 36-47.

Sayers, C.M. (1994) P-wave propagation in weakly anisotropic media, Geophys. J. Int., 116, 799-805.

Sayers, C.M. (1994) The elastic anisotropy of shales, J. Geophys. Res. B, 99, 767-774.

Sayers, C.M. (1994) Reply, J. Geophys. Res. B, 99, 11,753-11,754.

Thompson, R.B., Lee, S.S, Li, Y. and Sayers C.M. (1994) Ultrasonic and neutron diffraction characterization of texture in an in homogeneously rolled titanium plate. Mat. Sci. and Eng., A177, 261-267.

Schutjens, P.M.T.M., de Ruig, H., Sayers, C.M., van Munster, J.G. and Whitworth, J.L. (1994) Compressibility measurement and acoustic characterization of quartz-rich consolidated reservoir rock (Brent field, North Sea). In EUROCK '94, A.A. Balkema, Rotterdam.

Sayers, C.M. (1993) Anelliptic approximations for shales, J. Seis. Expl., 2, 319-331.

Sayers C.M. and Dahlin A. (1993) Propagation of ultrasound through hydrating cement pastes at early times. Advanced Cement Based Materials, 1, 12-21.

Sayers C.M. (1993) Ultrasound in solids with porosity, microcracking and polycrystalline structuring in Evaluation of Materials and Structures by Quantitative Ultrasonics, 249-300, J.D. Achenbach (editor), (Springer-Verlag, New York).

Sayers C.M. (1993) Comment on "Crack models for a transversely isotropic medium" by C.H. Cheng J. Geophys. Res. B. 98, 14,211-14,213.

Sayers C.M. and Grenfell R.L. (1993) Ultrasonic propagation through hydrating cements. Ultrasonics, 31, 147-153.

Schoenberg, M. and Sayers C.M. (1993) Seismic anisotropy of fractured rocks, Expanded Abstracts of the 3rd International Congress of the Brazilian Geophysical Society, Volume II, pp 1511-1515.

Sayers C.M. (1992) Elastic anisotropy of short-fibre reinforced composites. Int. J. Solids Structures, 29, 2933-2944.

Sayers C.M. and van Munster J.G. (1991) Microcrack-Induced Seismic Anisotropy of Sedimentary Rocks. J. Geophys. Res. B, 96, 16,529-16,533.

Sayers C.M. (1991) Ultrasonic anisotropy of metal matrix composites. Research in Non-Destructive Evaluation, 2, 135-141.

Sayers C.M. (1991) Fluid flow in a porous medium containing partially closed fractures. Transport in Porous Media, 6, 331-336.

Sayers C.M. and Kachanov M. (1991) A simple technique for finding effective elastic constants of cracked solids for arbitrary crack orientation statistics. Int. J. Solids and Structures, 27, 671-680.

Sayers C.M. (1990) The crystal structure of iron in the Earth's inner core, Geophysical Journal Int., 103, 285-286.

Sayers C.M. (1990) Orientation of microcracks formed in rocks during strain relaxation. Int. J. Rock Mechanics, 27, 437-439.

Sayers C.M., van Munster J.G. and King M.S. (1990) Stress-induced ultrasonic anisotropy in Berea sandstone. Int. J. Rock Mechanics 27, 429-436.

Sayers C.M. (1990) Stress-induced fluid flow anisotropy in fractured rock. Transport in Porous Media, 5, 287-297.

Sayers C.M. (1990) Ultrasonic studies of deformation and failure of rocks, in Elastic Waves and Ultrasonic Nondestructive Evaluation, pp 363-368, S.K. Datta, J.D. Achenbach and Y.S. Rajapakse (Editors) Elsevier Science Publishers B.V.

Sayers C.M. (1990) Inversion of ultrasonic wave velocity measurements to obtain the microcrack orientation distribution function in rocks. Engineering Fracture Mechanics 35, 743-749.

Sayers C.M. (1989) Elastic wave propagation in anisotropic microcracked rocks, in Elastic Wave Propagation, pp 431-436, M.F. McCarthy and M.A. Hayes (Editors), (Elsevier Science Publishers B.V., Amsterdam).

Sayers C.M. (1989) Seismic anisotropy of the inner core. Geophys. Res. Lett., 16, 267-270.

Sayers C.M. (1988) Stress-induced ultrasonic wave velocity anisotropy in fractured rock. Ultrasonics 26, 311-317.

Sayers C.M. (1988) Inversion of ultrasonic wave velocity measurements to obtain the microcrack orientation distribution function in rocks. Ultrasonics 26, 73-77.

Sayers C.M. (1987) Ultrasonic determination of texture and residual stress in polycrystalline metals, in Solid Mechanics Research for Quantitative Non-destructive Evaluation. 319-333, J.D. Achenbach and Y. Rajapakse (editors), (Martinus Nijhoff, Dordrecht).

Sayers C.M. (1987) Ultrasonic determination of texture and residual stress in polycrystalline metals, in Ultrasonic Methods in Evaluation of Inhomogeneous Materials, 367-379, A. Alippi and W.G. Mayer (editors) (Martinus Nijhoff, Dordrecht).

Sayers C.M. (1987) Orientation of Olivine in Dunite from elastic wave velocity measurements. Geophys. Res. Lett. 14, 1050-1052.

Sayers C.M. (1987) Thermal contraction stresses in cemented Tungsten Carbide composites, Mat. Sci. and Eng. 91, 195-199.

Sayers C.M. (1987) The elastic anisotropy of polycrystalline aggregates of Zirconium and its alloys, J. Nucl. Mat. 144, 211-213.

Sayers C.M. (1987) Elastic wave anisotropy in the upper mantle, Geophys. J. Roy. Astr. Soc. 88, 417-424.

Sayers C.M. (1987) Characterisation of microstructures using ultrasonics, in Ultrasonic Methods in Evaluation of Inhomogeneous Materials", 175-185. A. Alippi and W.G. Mayers (editors) (Martinus Nijhoff, Dordrecht).

Sayers C.M. (1986) Angular dependent ultrasonic wave velocities in aggregates of hexagonal crystals. Ultrasonics 24, 289-291.

Sayers C.M. and Proudfoot G.G. (1986) Angular dependence of the ultrasonic SH wave velocity in rolled metal sheets. J. Mech. Phys. Solids 34, 579-592.

Sayers C.M., Allen D.R., Haines G.E. and Proudfoot G.G. (1986) Texture and stress determination in metals by using ultrasonic Rayleigh waves and neutron diffraction. Phil Trans. Royal Soc. 320, 187-200.

Sayers C.M. and Clarke G.P. (1986) Effect of non-alignment of specimen and texture axes on the measurement of stress using the ultrasonic SH wave technique, J. Phys. D 19, 1547-1553.

Ferraz A., Chapman R.G., March N.H., Alascio B. and Sayers C.M. (1986) Sol. State Comm 57, 937-939.

Windsor C.G., Allen. A.J., Hutchings M.T., Sayers C.M., Sinclair R.N., Schofield P and Wright C.J. (1985) Neutrons for materials science, in Neutron Scattering in the Nineties IAEA, Vienna.

Sayers C.M. (1985) Angular dependence of the Rayleigh wave velocity in polycrystalline metals with small anisotropy. Proc. Roy. Soc. A 400, 175-182.

Allen D.R., Langman R. and Sayers C.M. (1985) Ultrasonic SH wave velocity in textured aluminum plates. Ultrasonics, 215-222.

Sayers C.M. (1985) Scattering of Ultrasound by minority phases in polycrystalline metals. Wave Motion 7, 95-104.

Sayers C.M. (1984) Texture independent determination of residual stress in polycrystalline aggregates using Rayleigh waves. J. Phys. D., 17, L179-L184.

Allen A.J., Andreani C., Hutchings M.T., Sayers C.M. and Windsor C.G. (1984) Neutron Diffraction Studies of Texture and Residual Stress in Weldments in Microstructural Characterisation of Materials by Non-Microscopical Techniques" pp 169-174 ed. N. Hessel Andersen et al. published by Riso National Laboratory.

Sayers C.M. (1984) Impurity promoted intergranular fracture. Phil. Mag. 50, 635-640.

Sayers C.M. (1984) Hydrogen adsorption on platinum. Surf. Sci. 143, 411-422.

Allen D.R. and Sayers C.M. (1984) The measurement of residual stress in textured steel using an ultrasonic velocity combinations technique. Ultrasonics 22, 179-188.

Sayers C.M. and Allen D.R. (1984) The influence of stress on the principal polarisation directions of ultrasonic shear waves in textured steel plates. J. Phys. D. 17, 1398-1413.

Sayers C.M. and Wright C.J. (1984) Hydrogen absorbed on nickel, palladium and platinum powders, J. Chem. Soc., Faraday Trans. 1, 80, 1217-1220.

Sayers C.M. and Tait C.E. (1984) Ultrasonic properties of transducer backings. Ultrasonics 22, 57-60.

Sayers C.M. (1984) Detectability of Defects by Thermal Non-Destructive Testing. Brit. J. NDT 26, 28-33.

Sayers C.M. (1984) The strain distribution in anisotropic polycrystalline aggregates subjected to an external stress field. Phil. Mag. 49, 243-262.

Sayers C.M. (1984) Vibrational modes of hydrogen adsorbed on the (110) surface of nickel. Surf. Sci. 136, 582-593.

Sayers C.M. (1983) Comments on "Kramers-Kronig relationships and wave propagation in composites" by A.I. Beltzer. (J. Acoust. Soc. Am. 73, 355 (1983)). J. Acoust. Soc. Am. 74, 1070-1071.

Wright C.J. and Sayers C.M. (1983) Inelastic neutron scattering from adsorbates. Rep. Prog. Phys. 46, 773-815.

Sayers C.M. and Smith R.L.(1983) Ultrasonic velocity and attenuation in an epoxy matrix containing lead inclusions. J. Phys. D. 16, 1189-1194.

Sayers C.M. (1983) The vibration spectrum of hydrogen bound by nickel catalysts. J. Phys. C. 16, 2381-90.

Allen A.J., Hutchings M.T., Sayers C.M., Allen D.R. and Smith R.L. (1983) Use of neutron diffraction texture measurements to establish a model for calculation of ultrasonic velocities in highly orientated austenitic weld material. J. Appl. Phys. 54, 555-60.

Sayers C.M. (1983) Coincidence of bounds for some elastic moduli of polycrystals with [100] fibre texture. Phil. Mag. A47, L1-4.

Allen D.R., Cooper W.H.B., Sayers C.M. and Silk M.G. (1982) The use of ultrasonics to measure residual stresses in "Research Techniques in Non Destructive Testing Vol. 6" ed. R.S. Sharpe (Academic Press, New York) 151-209.

Sayers C.M. (1982) Vibrations of neutrally adsorbed atoms on transition metal surfaces (abstract only) in "Vibrations at Surfaces" ed. R Caudano, J.-M. Gilles and A.A. Lucas, p. 135 (Plenum Press, New York).

Sayers C.M. (1982) Ultrasonic velocities in anisotropic polycrystalline aggregates. J. Phys. D. 15, 2157-67.

Sayers C.M. and Smith R.L. (1982) The propagation of ultrasound in porous media. Ultrasonics, 201-205.

Sayers C.M. (1982) Local moments and magnetic ordering in transition metals. Z. Phys. B. 46, 131-6.

Sayers C.M. (1981) The vibration spectrum of hydrogen bound by molybdenum sulphide catalysts. J. Phys. C. 14, 4969-83.

Allen D.R. and Sayers C.M. (1981) Neutron scattering studies of textures in mild steel. NDT International, 263-9.

Sayers C.M. and Kajzar F. (1981) On the stability of crystal structures in the 3d transition metal series. J. Phys. F. 11, 1055-61.

Sayers C.M. (1981) Ultrasonic velocity dispersion in porous materials. J. Phys. D. 14, 413-20.

Sayers C.M. (1980) Theory of hydrogen vibrations on transition metal surfaces. Surface Science 99, 471-487.

Allan G., Friedel J. and Sayers C.M. (1980) On the intraatomic Coulomb and exchange energies in degenerate narrow bands. J. Phys. Lett. 41, L287-9.

Sayers C.M. (1980) On the propagation of ultrasound in highly concentrated mixtures and suspensions. J. Phys. D. 13, 179-84.

Sayers C.M. (1979) On the use of pair interactions to model vibrations of an adatom on a transition metal surface. J. Phys. C. 12, 4333-6.

March N.H. and Sayers C.M. (1979) Magnetic properties of liquid metal alloys. Adv. Phys. 28, 1-47.

Sayers C.M. (1979) The vibration frequency of an atom at the surface of a tight binding metal. Surf. Sci. 82, 195-201.

Sayers C.M. (1979) The Einstein temperature of itinerant ferromagnets. J. Phys. F. 9, 123-9.

Friedel J. and Sayers C.M. (1978) On the bulk modulus of the transition metals. J. de Phys. Lett. 39, L59-60.

Friedel J. and Sayers C.M. (1977) Correlation effects in the bulk modulus and equilibrium lattice spacing of the transition metals. J. de Phys. Lett. 38, L263-5.

Friedel J. and Sayers C.M. (1977) On the role of d-d electron correlations in the cohesion and ferromagnetism of transition metals. J. de Phys. 38, 697-705.

Sayers C.M. (1977) Correlation effects in the cohesive properties of the transition metals. J. Phys. F. 7, 1157-66.

Sayers C.M., March N.H., Watson L.M. and Fabian D.J. (1977) On the soft X-ray emission from Fe-Al alloys. J. Phys. F. 7, L77-79.

Sayers C.M. (1976) Screening of non-transition element impurities in iron. J. Phys. F. 6, 1939-52.

Sayers C.M., March N.H., Dev A., Fabian D.J. and Watson L.M (1975) Soft X-ray emission study of the screening of Al impurities in Fe. J. Phys. F. 5, L207-210.

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