Margaret M. Sanders, Ph.D.
Margaret Sanders is a Research Geologist with the USGS Geology, Energy & Minerals (GEM) Science Center in Reston, VA.
Dr. Sanders joined the USGS in 2018 as a Research Geologist working in the Organic Petrology Laboratory in Reston, Virginia. Currently, she works with the Alaska Petroleum Systems project, where her research is focused on Alaskan North Slope coal and source rock organic petrology and characterization in support of oil and gas assessments. She also works with the Thermal Indices project investigating the use of hydrous pyrolysis for the artificial maturation of sedimentary organic matter.
Professional Experience
October 2018 to present: Research Geologist, USGS Geology, Energy & Minerals Science Center, Reston, Virginia
October 2017 to September 2018: Postdoctoral Fellow, University of Kentucky, Lexington, Kentucky
September 2014 to December 2014: Organic Petrology Intern, ConocoPhillips
May 2013 to August 2013: Applied Geologist Intern, BP
May 2013 to August 2013: Geochemistry Intern, Shell
Education and Certifications
Ph.D., Geoscience, Southern Illinois University, 2017
M.S., Geology, Southern Illinois University, 2012
B.S., Atmospheric, Oceanic, and Environmental Science, University of California, Los Angeles, 2006
Affiliations and Memberships*
The Society for Organic Petrology (TSOP)
American Association of Petroleum Geologists (AAPG)
Geological Society of America (GSA)
Science and Products
Portable Raman spectroscopic analysis of bulk crushed rock
This study presents a simplified method and empirical relationships for determining organic matter thermal maturity using a portable Raman system equipped with a 785 nm laser, for analysis of crushed, whole-rock samples. Several sets of rocks comprised of shale and coal samples with various mineralogical composition, thermal maturity, total organic carbon (TOC), and age were used to test the metho
Thermal evolution of graptolite and solid bitumen properties at high maturity under natural and artificial conditions
To refine the use of graptolite and solid bitumen properties as thermal proxies at overmature conditions, we evaluated their evolution via Raman and infrared spectroscopies, reflectance, and geochemical screening in high-temperature hydrous and anhydrous experiments in comparison to naturally matured samples. Naturally matured samples included four overmature Wufeng-Longmaxi marine shales from the
Maturation study of vitrinite in carbonaceous shales and coals
This study evaluated carbonaceous shales proximal to coal measures and coal samples via isothermal hydrous pyrolysis (HP) to compare differences in the maturation pathways of vitrinite in different matrices and with different starting aromaticity. Sample residues were analysed via vitrinite reflectance (VRo), geochemical screening tests (organic carbon and programmed temperature pyrolysis), and in
Solid bitumen and vitrinite reflectance suppression explored using hydrous pyrolysis of artificial source rock (2021)
The most commonly used parameter for thermal maturity calibration in basin modelling is mean random vitrinite reflectance (Ro). However, Ro suppression, or lower than expected Ro, has been noted in samples containing a high proportion of liptinite macerals. This has been empirically demonstrated using hydrous pyrolysis experiments of artificial source rock containing various proportions of thermal
Evaluation of portable Raman spectroscopic analysis for source-rock thermal maturity assessments on bulk crushed rock
This study presents a simplified method and empirical relationships for determining organic matter thermal maturity using a portable Raman system equipped with a 785 nm laser, for analysis of crushed, whole-rock samples. Suites of rocks represented by shale and coal samples with various mineralogical composition, thermal maturity, and total organic carbon (TOC) were used to test the method and bui
Authors
Martha (Rebecca) Stokes, Aaron M. Jubb, Paul C. Hackley, Justin E. Birdwell, Elliott Barnhart, Clint Scott, Jenna L. Shelton, Margaret M. Sanders, Javin J. Hatcherian
Thermal evolution of graptolite and solid bitumen properties at high maturity under natural and artificial conditions
To refine the use of graptolite and solid bitumen as thermal proxies at overmature conditions, we evaluated their evolution via Raman and infrared (IR) spectroscopies, reflectance, and geochemical screening using high-temperature pyrolysis experiments in comparison to naturally matured samples. Naturally matured samples included marine shales from the overmature Upper Ordovician Wufeng-Lower Silur
Authors
Jianyang Song, Paul C. Hackley, Margaret M. Sanders, Aaron M. Jubb, Qingyong Luo
Maturation study of vitrinite in carbonaceous shales and coals: Insights from hydrous pyrolysis
The presence of vitrinite in sedimentary rocks of post-Silurian age allows its reflectance to be used to estimate the thermal maturation of organic matter in petroleum systems. Increasing reflectance of vitrinite, which is primarily driven by aromaticity, depends primarily on the time and temperature attributes of its evolutionary pathway. This study evaluated carbonaceous shales proximal to coal
Authors
Divya K. Mishra, Paul C. Hackley, Aaron M. Jubb, Margaret M. Sanders, Shailesh Agrawal, Atul K. Varma
Identification of thermal maturity-relevant organic matter in Shale Working Group Report 2021
The Identification of Thermal Maturity-Relevant Organic Matter in Shale Working Group of the ICCP was established in 2008 to provide guidelines for identifying and measuring the reflectance of the population of dispersed organic matter that is relevant to thermal maturity determination. Information products published by the working group include ASTM D7708 Standard Test Method for Microscopical De
Authors
Paul C. Hackley, Javin J. Hatcherian, Jennifer L. Rivera, Margaret M. Sanders, Brett J. Valentine
Molecular mechanisms of solid bitumen and vitrinite reflectance suppression explored using hydrous pyrolysis of artificial source rock
The most commonly used parameter for thermal maturity calibration in basin modelling is mean random vitrinite reflectance (Ro). However, Ro suppression has been noted in samples containing a high proportion of liptinite macerals. This phenomenon has been demonstrated empirically using hydrous pyrolysis of artificial source rock containing various proportions of thermally immature Wyodak-Anderson c
Authors
Margaret M. Sanders, Aaron M. Jubb, Paul C. Hackley, Kenneth E. Peters
Assessment of undiscovered gas resources in Upper Devonian to Lower Cretaceous strata of the western North Slope, Alaska, 2021
Using a geology-based assessment methodology, the U.S. Geological Survey estimated a mean of 1,407 billion (1.4 trillion) cubic feet of gas in conventional accumulations in Upper Devonian to Lower Cretaceous strata of the western North Slope, Alaska.
Authors
David W. Houseknecht, Tracey J. Mercier, Christopher J. Schenk, Thomas E. Moore, William A. Rouse, Julie A. Dumoulin, William H. Craddock, Richard O. Lease, Palma J. Botterell, Margaret M. Sanders, Rebecca A. Smith, Christopher D. Connors, Christopher P. Garrity, Katherine J. Whidden, Jared T. Gooley, John W. Counts, Joshua H. Long, Christina A. DeVera
Assessment of undiscovered oil and gas resources in the Central North Slope of Alaska, 2020
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 3.6 billion barrels of oil and 8.9 trillion cubic feet of natural gas (associated and nonassociated) in conventional accumulations in Mississippian through Paleogene strata in the central North Slope of Alaska.
Authors
David W. Houseknecht, Katherine J. Whidden, Christopher D. Connors, Richard O. Lease, Christopher J. Schenk, Tracey J. Mercier, William A. Rouse, Palma J. Botterell, Rebecca A. Smith, Margaret M. Sanders, William H. Craddock, Christina A. DeVera, Christopher P. Garrity, Marc L. Buursink, C. Özgen Karacan, Samuel J. Heller, Thomas E. Moore, Julie A. Dumoulin, Marilyn E. Tennyson, Katherine L. French, Cheryl A. Woodall, Ronald M. Drake, Kristen R. Marra, Thomas M. Finn, Scott A. Kinney, Chilisa M. Shorten
Science and Products
- Data
Portable Raman spectroscopic analysis of bulk crushed rock
This study presents a simplified method and empirical relationships for determining organic matter thermal maturity using a portable Raman system equipped with a 785 nm laser, for analysis of crushed, whole-rock samples. Several sets of rocks comprised of shale and coal samples with various mineralogical composition, thermal maturity, total organic carbon (TOC), and age were used to test the methoThermal evolution of graptolite and solid bitumen properties at high maturity under natural and artificial conditions
To refine the use of graptolite and solid bitumen properties as thermal proxies at overmature conditions, we evaluated their evolution via Raman and infrared spectroscopies, reflectance, and geochemical screening in high-temperature hydrous and anhydrous experiments in comparison to naturally matured samples. Naturally matured samples included four overmature Wufeng-Longmaxi marine shales from theMaturation study of vitrinite in carbonaceous shales and coals
This study evaluated carbonaceous shales proximal to coal measures and coal samples via isothermal hydrous pyrolysis (HP) to compare differences in the maturation pathways of vitrinite in different matrices and with different starting aromaticity. Sample residues were analysed via vitrinite reflectance (VRo), geochemical screening tests (organic carbon and programmed temperature pyrolysis), and inSolid bitumen and vitrinite reflectance suppression explored using hydrous pyrolysis of artificial source rock (2021)
The most commonly used parameter for thermal maturity calibration in basin modelling is mean random vitrinite reflectance (Ro). However, Ro suppression, or lower than expected Ro, has been noted in samples containing a high proportion of liptinite macerals. This has been empirically demonstrated using hydrous pyrolysis experiments of artificial source rock containing various proportions of thermal - Publications
Evaluation of portable Raman spectroscopic analysis for source-rock thermal maturity assessments on bulk crushed rock
This study presents a simplified method and empirical relationships for determining organic matter thermal maturity using a portable Raman system equipped with a 785 nm laser, for analysis of crushed, whole-rock samples. Suites of rocks represented by shale and coal samples with various mineralogical composition, thermal maturity, and total organic carbon (TOC) were used to test the method and buiAuthorsMartha (Rebecca) Stokes, Aaron M. Jubb, Paul C. Hackley, Justin E. Birdwell, Elliott Barnhart, Clint Scott, Jenna L. Shelton, Margaret M. Sanders, Javin J. HatcherianThermal evolution of graptolite and solid bitumen properties at high maturity under natural and artificial conditions
To refine the use of graptolite and solid bitumen as thermal proxies at overmature conditions, we evaluated their evolution via Raman and infrared (IR) spectroscopies, reflectance, and geochemical screening using high-temperature pyrolysis experiments in comparison to naturally matured samples. Naturally matured samples included marine shales from the overmature Upper Ordovician Wufeng-Lower SilurAuthorsJianyang Song, Paul C. Hackley, Margaret M. Sanders, Aaron M. Jubb, Qingyong LuoMaturation study of vitrinite in carbonaceous shales and coals: Insights from hydrous pyrolysis
The presence of vitrinite in sedimentary rocks of post-Silurian age allows its reflectance to be used to estimate the thermal maturation of organic matter in petroleum systems. Increasing reflectance of vitrinite, which is primarily driven by aromaticity, depends primarily on the time and temperature attributes of its evolutionary pathway. This study evaluated carbonaceous shales proximal to coalAuthorsDivya K. Mishra, Paul C. Hackley, Aaron M. Jubb, Margaret M. Sanders, Shailesh Agrawal, Atul K. VarmaIdentification of thermal maturity-relevant organic matter in Shale Working Group Report 2021
The Identification of Thermal Maturity-Relevant Organic Matter in Shale Working Group of the ICCP was established in 2008 to provide guidelines for identifying and measuring the reflectance of the population of dispersed organic matter that is relevant to thermal maturity determination. Information products published by the working group include ASTM D7708 Standard Test Method for Microscopical DeAuthorsPaul C. Hackley, Javin J. Hatcherian, Jennifer L. Rivera, Margaret M. Sanders, Brett J. ValentineMolecular mechanisms of solid bitumen and vitrinite reflectance suppression explored using hydrous pyrolysis of artificial source rock
The most commonly used parameter for thermal maturity calibration in basin modelling is mean random vitrinite reflectance (Ro). However, Ro suppression has been noted in samples containing a high proportion of liptinite macerals. This phenomenon has been demonstrated empirically using hydrous pyrolysis of artificial source rock containing various proportions of thermally immature Wyodak-Anderson cAuthorsMargaret M. Sanders, Aaron M. Jubb, Paul C. Hackley, Kenneth E. PetersAssessment of undiscovered gas resources in Upper Devonian to Lower Cretaceous strata of the western North Slope, Alaska, 2021
Using a geology-based assessment methodology, the U.S. Geological Survey estimated a mean of 1,407 billion (1.4 trillion) cubic feet of gas in conventional accumulations in Upper Devonian to Lower Cretaceous strata of the western North Slope, Alaska.AuthorsDavid W. Houseknecht, Tracey J. Mercier, Christopher J. Schenk, Thomas E. Moore, William A. Rouse, Julie A. Dumoulin, William H. Craddock, Richard O. Lease, Palma J. Botterell, Margaret M. Sanders, Rebecca A. Smith, Christopher D. Connors, Christopher P. Garrity, Katherine J. Whidden, Jared T. Gooley, John W. Counts, Joshua H. Long, Christina A. DeVeraAssessment of undiscovered oil and gas resources in the Central North Slope of Alaska, 2020
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 3.6 billion barrels of oil and 8.9 trillion cubic feet of natural gas (associated and nonassociated) in conventional accumulations in Mississippian through Paleogene strata in the central North Slope of Alaska.AuthorsDavid W. Houseknecht, Katherine J. Whidden, Christopher D. Connors, Richard O. Lease, Christopher J. Schenk, Tracey J. Mercier, William A. Rouse, Palma J. Botterell, Rebecca A. Smith, Margaret M. Sanders, William H. Craddock, Christina A. DeVera, Christopher P. Garrity, Marc L. Buursink, C. Özgen Karacan, Samuel J. Heller, Thomas E. Moore, Julie A. Dumoulin, Marilyn E. Tennyson, Katherine L. French, Cheryl A. Woodall, Ronald M. Drake, Kristen R. Marra, Thomas M. Finn, Scott A. Kinney, Chilisa M. Shorten
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government