Stephen Cossey

Chief Geoscientist @ Cossey and Associates Inc.

Dr. Stephen Cossey is chief geoscientist at Cossey and Associates Inc. providing geoconsulting. He has more than 40 years of experience in the petroleum industry. He worked for Conoco Uranium exploration and International Exploration and Sohio/BP prior to starting his own company in 1995. With Sohio, he was working in oil & gas exploration in frontier areas of the US. He spent 2 years based at BP Research in Sunbury, UK, and helped to start BP’s deep-water research program. The remainder of the time at BP was spent working on exploration in the onshore US

Actus Veritas Geoscience and U3 Explore Network                        2022 – Present


Participating in AVGeo collaborative, multidisciplinary projects as a member of a subject matter experts team delivering and advising on geoscience and engineering aspects of subsurface characterization, instructor for E&P project evaluation methodologies and their application in subsurface characterization for carbon sequestration projects.

Cossey & Associates, Inc., Houston and Durango, CO                   1995 –Present


Projects are in the exploration, appraisal, development, and modeling of deep-water clastic reservoirs, specifically building deep-water databases and reservoir models from the core, outcrop, seismic and other data.

Projects are delivered for companies:

Agip, AGI, Amerada Hess Norge, AMGP, Amoco, Anadarko, Apache Egypt, Arawak Energy, Arco, AWE, Baker Atlas, Bass Enterprises, BHP Billiton, BP, British Borneo, British Gas, Burlington Resources, Capitol Energy, CAREC, CGX Resources, ChevronTexaco, Cobalt International, ConocoPhillips, Custer Resources, Daewoo, Devon Energy, DGA, Dominion, DONG, Ecopetrol, EEX, Energy and Geoscience Institute, Elf, El Paso, EnCana, Energy Africa, Enterprise, ENI, ExxonMobil, Fletcher Challenge, Fugro-Robertson, Goodrich Energy, Grana y Montero, GYMSA, Halliburton, Hardman, Hunt Oil, Hunter 3D, Idemitsu Norge, IHS Energy, INPEX, Interoil Peru, Itochu, Japex, JOGMEC, Kerr McGee, KNOC, Lonropet, Marbit Geoconsulting, Mariner, Maxus, Mitsubishi, Mitsui, Moche Energy, Murphy Oil, Namibian Mines and Energy, Namcor, Neumin Production, Newfield Exploration, Nexen Petroleum, Niko Asia Ltd., Noble Energy, Norbay Oil, Norsk Hydro, Ocean Energy, Oil Search Ltd., ONGC, Oxy, Pacific Stratus Energy S.A., Paluxy Ridge Consulting, PanCanadian, Pemex, PennzEnergy, Petrobras, Petrobras Energia Peru, PetroCanada, PetroChina, Petrolera Monterrico, Petroleum Agency SA, PetroSA, PetroSUMMIT, Petro Tech Peruana S.A., PetroTrin, Phillips, Pioneer, PlusPetrol Norte, Premier Oil, RepsolYPF, Repsol Exploracion del Peru, RIFTT, RWE Dea, St Marys Land, Samson, SandRidge Energy, Santos USA, Savia Peru, Senergy Ltd, Schlumberger, Scotia Group, Seis Strat Services, Shell Canada, Shell International, Shell Norge, Siboil de Peru, Sigmund Kane and Hatch, SK Energy, Sonangol, Sonat, Spinnaker Exploration, Star Deep Water, Statoil, Stone Energy, Svenska, Texaco, Teyra Geoconsulting, Talisman, Texwood Energy, 3DX Technologies, TrinMar, Triton, Tullow Oil, UCL, Union Oil and Gas Group, United World Energy, Unocal, Venari Resources, Venture Production, Vitol, Westech Energy, Wintershall AG, Woodside Petroleum, XTO Energy, Zebbra Energy, 3MSCo Resources.

Previous experience:

BP / StandardOil/ Sohio, Houston, Dallas, and Sunbury, U.K.  

Exploration, Research, New Ventures


Geologist, International Exploration

Research Geologist, Uranium Exploration


B.S., Geology, University College of Swansea, Wales, 1974

M.S., Geology, University of S. Carolina, Columbia, 1975

Ph.D., Geology, University of S. Carolina, Columbia, 1978.

Recent Publications

Access to 90 publications Published by Stephen Cossey is available on the ResearchGate

The most recent papers are:

Framework and Rossella, E.A., and Cossey, S.P.J., 2012, What is the evidence for subduction in the Caribbean Margin of Colombia? XISimposio Bolivariano: PETROLEUM EXPLORATION IN SUBANDEAN BASINS, Cartagena deIndias, Colombia, August 29th to September 1st, 2012.

Rossello, E.A., and Cossey, S.P.J., 2013, Interpretaciones Ambiguas de Morfologías

Compresionales sobre Márgenes Continentales: Aplicación al Caribe Colombiano, XIV

Coingreso Colombiano de Geología, 31 Jul – 2 agosto 2013, ISBN 978-958-57950-0-6, p.238.

Vásquez, R.O., Cossey, S.P.J., Van Nieuwenhuise, D.S., Davis, J., and J. Castagna, 2014, New

Insights into the Stratigraphic Framework and Depositional History of the Paleocene and Eocene Chicontepec Formation, Onshore Eastern Mexico, AAPG Annual Meeting, Houston, 6-9 April, 2014, Extended Abstracts Control ID: 1841799 10p.

Cossey, S.P.J., VanNieuwenhuise, D. V., Davis, J., Rosenfeld, J.H., Pindell, J., 2016, Compelling evidence from eastern Mexico for a Late Paleocene/Early Eocene isolation, drawdown, and refill of the Gulf of Mexico, Interpretation, Vol. 4, No. 1 (February 2016), p. SC63-SC80, 20FIGS.

Cossey, S.P.J., and M. Bitter, 2016, The KPg Impact Deposits in the Tampico-Misantla Basin, Eastern Mexico, 35th Annual GCSSEPM Foundation Perkins-Rosen Research Conference, Houston December 2016,p.A-1-A-7.

Weimer, P., R. Bouroullec, J. Adson, and S. P.J. Cossey, 2017, An overview to the petroleum systems of the northern deep-water Gulf of Mexico: AAPG Bulletin, v. 101, p.941-993.

Weimer, P., E. Zimmermann, S. P. J. Cossey, H. Hirsh, B. Snyder, M. Leibovitz, K.

Schwendeman, B. Hankins, B. Herber,  D. Bettinger, J. Adson, W. S. Gutterman, T.J. Payeur,  R. Bouroullec, J. G. Roesink,J. Nicolette, T. G. Lapinski, and A. A. van den Berg, 2017, Atlas of fields and discoveries, central Mississippi Canyon, Atwater Valley, northwestern LloydRidge, and western Desoto Canyon protraction areas, northern deep-water Gulf of Mexico: AAPG Bulletin, v. 101, p. 995-1002, plus 93 p. on AAPG-Data Share 81.

Cossey, S.P.J.,2017, The Geological Treasure of the Sierra Madre, GEOExPro, February 2017,p.12-15.

Cossey, S. P. J. , M. R. Bitter, G. R.Dickens, D. V. Nieuwenhuise, J. Pindell, J. H. Rosenfeld, A. Beltrán-Triviño,P. Cornick, and C. Agnini, 2019, Paleo-canyon formation and contemporaneous oil seepage near the Paleocene/Eocene boundary, Tampico-Misantla Basin, eastern Mexico: GeoGulf Transactions, v. 69, p. 27–53.

Pindell, J., Weber, B., Hale-Erlich, W., Cossey, S., Bitter, M., Molina Garza, R., Graham, R., and Erlich, R.N., 2020, Strontium isotope dating of evaporites and the breakup of the Gulf of Mexico and Proto–Caribbean Seaway, in Martens, U., and Molina Garza, R.S., eds., Southern and Central Mexico: Basement Framework, Tectonic Evolution, and Provenance of Mesozoic– Cenozoic Basins: Geological Society of America special paper 546, p. 1–21,

Pindell, J., and S.P.J. Cossey, 2020, It Is Still Viable!: Paleogene Gulf of Mexico Water-Level Drawdown Hypothesis, AAPG Explorer, July 2020, p.

Cossey, S.P.J., M. R. Bitter, M. W. Titus, A. Zumberge, and J. Zumberge, 2020, Hydrocarbon Sources and Migration Events in the Chicontepec Formation (Wilcox Group Equivalent) of Eastern Mexico, GeoGulf Transactions, v. 70, p. ??-??

Cossey, S.P.J.,J. Pasley and H. J. White, 2020, The Sedimentology, Depositional History and Reservoir Modelling of Zama Field, Offshore Mexico, GeoGulf Transactions, v.70.

Cossey, S.P.J., Rosenfeld, J., Bitter, M., and J. Pindell, 2021, Update on the PaleogeneWaterLevel Drawdown Hypothesis, Gulf of Mexico, GCAGS Journal, v. 10 (2021), p.123–141.

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