Sherilyn Williams-Stroud



To continue and enhance my career goal of being instrumental in providing science information and improved understanding of science in a public service context, such as a civil service appointment, or an academic teaching position. I enjoy working with highly-skilled and motivated people who are self-directed, but I also would like to be able to mentor students. The opportunity to do research is also very important.


Ph.D.,Structural Geology 1988
The Johns Hopkins University Baltimore, MD

M.A., Structural Geology 1984
The Johns Hopkins University Baltimore, MD

B.A. Geology 1981
Oberlin College Oberlin, Ohio



I enjoy utilizing leading-edge computer modeling software and tools for geomechanically-based strain analyses of subsurface structures in reservoir rocks to predict sub-seismic deformation. I am interested in using calculations of the present-day stress tensor relationship with current deformation states to extrapolate the regional tectonic history. Because of its restricted stability field under geologic conditions, I want to map and analyze gypsum structures and combine the structural analysis with gypsum deformation experiments to develop analog models to scale up to deep mantle deformation processes. I am also interested in evaporite geochemistry as it relates to seawater composition through geologic time.


Senior Research Scientist (1998-present)
ChevronTexaco Exploration and Production Technology, 4800 Fournace Pl., Bellaire, TX 77401
Apply fracture evaluation technologies and structural geologic modeling to exploration and production efforts to better define reservoir seals and hydrocarbon migration pathways. Work with basin, geochemical and stratigraphic modelers to integrate fracture models and basin structure models into basin geology interpretations. Interact with business units to delineate necessary activities for fracture core research program. Coordinate funding for university fracture research consortia, track and review the results of their research, disseminate resulting technologies to the business units. Developed fracture prediction methods based on volume strain analysis and borehole fracture interpretations that were used to plan additional wells in reservoirs in the Arabian Plateau. Evaluated stress magnitudes in gas sand reservoirs in the Sichuan Basin that are used as a basis for understanding active tectonic stresses for use in borehole stability calculations.

Adjunct Faculty (2000-2002)
University of Houston - Downtown, One Main Street, Houston, TX 77002
Teach Saturday and section of the introductory physical geology course. Customized the course around the lecture/laboratory format, and created a web page to relay information to the students, provide them with on line resources, and encourage them to be interested in science for more than just satisfying a course requirement for graduation.

Staff Scientist For Program (1996-1998)
U.S. Geological Survey, Denver Federal Center, Denver, CO 80225
Oversee internal programs of the Central Region USGS Geologic Division, including the National Reactor Facility, National Ice Core Laboratory, Core Research Center, Central Publications Support Services, and the Geologic Division Microbeam Laboratory. Participate in management meetings to facilitate planning and development, review proposals and recommend approval for internal program projects. Accomplish or oversee accomplishment of special internal projects involving safety, Human Resources, and EEO issues, compiling matrixes for Regional activities, contributions to State Fact Sheets. Helped to redesign the funding mechanism for the microbeam laboratory and the position description of the microbeam scientist. Chaired a committee that developed recommendations for implementing revised cost structure for USGS publications by publication type and priority.

Guest Faculty (July-August 1996)
Keck Geology Consortium, Carleton College, Northfield, MN 55057
Participated in the Keck Geology Consortium field camp, environmental geophysics project in Butte Montana. My job was to assist undergraduate (junior -senior) level geology students with design, logistics and field data collection for so that they would leave the field camp with sufficient data and project organization to complete their senior geology thesis project. As a faculty advisor, I maintained advisory contact with students to help them complete their project and develop a presentation for the Keck Consortium meeting for all of the consortium projects from that year.

Research Geologist (1988-1996)
U.S. Geological Survey, Denver Federal Center, Denver, CO 80225
Yucca Mountain Project (1995-1996): Conduct mapping and collect fracture data from surface and subsurface exposures in order to construct structural model of volcanic tuff rocks at Yucca Mountain, Nevada, to be used to assess site suitability for potential national nuclear waste repository. Created fracture database used to generate the fracture synthesis report of Yucca Mountain fracture data required for site suitability assessment. Paradox Basin Project (1988-1995): Conduct research in the area of evaporite geology using petrographic analysis of salt rock drill cores, field studies, mass balance calculations and geochemical computer models to develop models for depositional history and brine evolution of salt and potash deposits. Served as Commodity Specialist for potash, bromine and iodine. Worked as team member on other research projects, including scientific exchange project with the Polish Geological Survey to study and compare large evaporite basins in the U.S. and in Poland.

USGS Graduate Internship (1986-1987)
U.S. Geological Survey,National Center, Reston, VA 22092
Conduct experiments in the deformation of gypsum, make micro-structural analyses, prepare thin sections, do photo-microscopy and other research leading to the completion of a Ph.D. thesis.

Teaching Assistant (1985-1986)
The Johns Hopkins University, Baltimore, MD 21218
Prepare and deliver lectures and assist with laboratory exercises in advanced undergraduate structural geology course, microfabric analysis.


Arabian Plateau, Kuwait and Saudi Arabia
Basin and Range Province, Nevada, USA
Deepwater Gulf of Mexico
Guaduas Basin, Colombia
Offshore Nigeria
Paradox Basin, Colorado and Utah, USA
Pri-Caspian Basin, Karachaganak, Kazakhstan
Red River Basin, Oklahoma
Sichuan Basin, China





American Association of Petroleum Geologists
American Geophysical Union
Geological Society of America
National Association of Black Geologists and Geophysicists
SEPM (Society For Sedimentary Geology)

Professional Society Service Work

Co-Leader of Mini-Summit on Diversity in AAPG, AAPG Leadership Meeting, Tulsa, OK, January 2002.
AAPG Core and Sample Preservation Committee, 2000 to present
Local Chair, USGS Geologic Division Ethnic Minority Advisory Committee, 1992-1995
Convener, 1994 AAPG meeting poster session, "Geochemical and Textural Indicators of Basin Brine Evolution in Evaporites", 1992 93
Debate Coordinator, Mini Debate Series, 1994 SEPM/AAPG Convention, "Evaporite Deposition  Is Depth the Question?"


Refereed Journal Articles

Williams, S., 1988, The shear strength of gypsum single crystals on three cleavage planes, Tectonophysics, v. 148, p. 163 173.

Williams Stroud, S., 1994, Evolution of an inland sea of marine origin to a non marine saline Lake: The Pennsylvanian Paradox salt deposit, SEPM Special Publication 50, p. 293 306.

Williams Stroud, S., Searls, J. P. and Hite, R. J., 1994, Potash Resources, in Industrial Minerals and Rocks, 6th Edition, Society for Mining, Metallurgy, and Exploration, Inc., p. 783 802.

Williams Stroud, S., 1994, Potash Mining Engineering (industrial Minerals 1993 annual review article), June, 1994, p. 540 542.

Williams Stroud, S., 1995, Solution to the Paradox? Results of some chemical equilibrium models and mass balance calculations as applied to the Paradox basin evaporite deposit, American Journal of Science, vol 294, p. 1189 1228.

Williams Stroud, S., and Paul, J., 1997, Initiation and growth of gypsum piercement structures in the Zechstein Basin, Journal of Structural Geology, 19 (7), p. 897 907.

Sweetkind, D. S., Anna, L. O., Williams Stroud, S. C., and Coe, J. A., (1997), Characterizing the fracture network at Yucca Mountain, Nevada, Part 1, Integration of field data for numerical simulations, Hoak, T. E., Klawitter, A. L., and Blomquist, P. K., eds., Fractured Reservoirs: Characterization and Modeling, p. 185 196.


Williams, S., 1986, Experimental pressure solution of gypsum, Abstract for poster session, American Association of Petroleum Geologists Annual Convention.

Williams, S., 1986, Deformation mechanisms observed during in situ deformation of gypsum, abstract for poster session, American Geophysical Union Spring Meeting.

Williams Stroud, S., 1991, The Evolution of an inland sea of Marine Origin to a non marine saline lake: The Pennsylvanian Paradox Salt Deposit, Conference on Sedimentary and Paleolimnological Records of Saline Lakes, Saskatoon, Saskatchewan, Canada, Aug. 13 16, 1991.

Herring, J.R., Piper, D.Z., Williams Stroud, S., Spirakis, C.S. and Sheppard, R.A., 1991, U.S. Geological Survey research on agricultural industrial minerals in the United States  Implications for Exploration, in Good, E.E., Slack, J.F., and Kotra, R.K., eds., U.S. Geological Circular 1062, USGS Research on Mineral Resources 1991 programs and abstracts p. 38 39

Williams Stroud, S.C., 1993, Fluid inclusion evidence for multiple generations of halite crystallization in the Paradox Formation, Colorado and Utah, Geological Society of America Abstracts with Programs, 1993 Annual Meeting, Boston, MA.

Williams Stroud, S.C., and Kyser, T. K., 1994, Evolution of basin brines in the Paradox Formation, Western United States: Evidence from sedimentary textures, fluid inclusions, and stable isotopes, AAPG 1994 Annual Convention Program.

Dean, W. E., Peryt, T. M.., Czapowski, G., Paul, J., Williams Stroud, S., 1994, Comparative anatomy of large evaporite basins: The Zechstein Basin of central Europe and the Delaware Basin of Texas and New Mexico, AAPG 1994 Annual Convention Program.

Petrichenko, O., Williams Stroud, S., 1995, Chemical composition of water in the Late Carboniferous evaporite Paradox Basin (USA), XIII Carboniferous Permian Congress, Krakow, Poland.

Dean, W. E., Peryt, T. M., Czapowski, G., Williams Stroud, S., Johnson, K. S., Gasiewicz, A., 1995, Comparative anatomy of large Permian evaporite basins: the Zechstein basin of Poland and the Permian Basin of southwestern United States, XIII Carboniferous Permian Congress, Krakow, Poland.

Sweetkind, D. S., and Williams Stroud, S., 1995, Controls on the genesis of fracture networks, Paintbrush Group, Yucca Mountain, Nevada, EOS, Transactions, American Geophysical Union, 76 (46, Suppl.), p. 597, American Geophysical Union 1995 fall meeting, San Francisco, CA

Williams Stroud, S. C. and Barton, C., 2000, Stress magnitudes associated with flexural slip in a hanging wall anticline, Geological Society of America Abstracts with Programs, 32 (7).

Internal Reports and Open-File Reports

Williams, S., 1988, The shear strength of gypsum single and polycrystals and its implications for petrofabric analysis. Unpublished Ph.D. dissertation, The John Hopkins University, 152 p.

Williams Stroud, S., 1991, Descriptive model of Potash bearing bedded salt (Model 35ab(T), p. 26-28; Descriptive Model of Naturally Occurring Iodine Brines (Model 35am), p. 36-37; Descriptive Model of Naturally Occurring Bromite Brine (Model 35 am), p. 38 39; Descriptive Model of Iodine Bearing Nitrate (Model 35bl), p. 45 46; in Orris G.J., and Bliss, J.D., eds., Some Industrial Mineral Deposit Models: Descriptive Deposit Models, U.S. Geological Survey Open File Report 91 11A.

Williams Stroud, S., 1992, Potash, Saline brines and brine deposits, in Minerals and Energy Resources of the BLM Roswell Resource Area East Central New Mexico, Susan Bartsch Winkler, editor. USGS Open File Report 92 0261.

Williams Stroud, S., 1992, Potash, Saline brines and brine deposits, in Minerals and Energy Resources of the BLM Roswell Resource Area East Central New Mexico, Susan Bartsch Winkler, editor. USGS Open File Report 92 0261.

Sweetkind, D. S., and Williams Stroud, S. C., 1996, Synthesis of fracture data from the Yucca Mountain project: Administrative Report for U. S. Dept. of Energy, 91 pages and 30 figures.

In Preparation

Petrichenko, O. I., Williams Stroud, S. C., and Peryt, T. M., 2002, (submitted to Journal of Sedimentary Research) The Relationship of Brine Chemistry of the Pennsylvanian Paradox Evaporite Basin to Secular Variation in Seawater Chemistry.

Williams-Stroud, S.C., (in preparation) Fracture Modeling in the Subsurface using stress and strain analysis and 3D modeling software.