March 8, 2019:

Quick-Look Deterministic Approach for Evaluating Shale Distribution in
Sandstone Reservoirs

James J. Willis, Ph.D.
Willis School of Applied Geoscience
St. Martinville, Louisiana

Shale distribution in sandstone reservoir can be broadly described in
terms of three components:  shale laminations interlayered within the
overall sandstone interval, dispersed shale within the overall sandstone
pore network, and structural shale comprised of sand-sized particles of
shale composition.  Quantification of shale distribution types can be
readily constrained by quick-look deterministic graphical and mathematical
analyses using total porosity versus shale volume, effective porosity
versus shale volume, and density porosity versus neutron porosity.  Use of
conventional triple combination log data can determine the range of
distribution quantities (from most pessimistic to most optimistic in terms
of reservoir quality), but additional data such as nuclear magnetic
resonance, core, and triaxial resistivity log data can constrain these
ranges to specific quantities.  Determination of the laminar shale
fraction determines the sandstone fraction; the dispersed shale fraction
reduces the effective porosity of the sandstone fraction; and the
structural shale fraction further reduces the useful porosity of the
sandstone fraction.


James J. Willis received his B.S. and M.S. degrees in Geology from the now
University of Louisiana-Lafayette in 1989 and 1990, respectively, and his
Ph.D. as a National Science Foundation fellow at Baylor University, Waco,
Texas, in 1993, graduating with an overall university gpa of 4.0.  From
1994-1996, he studied planetary tectonics as a NASA-funded postdoctoral
fellow at Southern Methodist University.  In 1996, he returned to
UL-Lafayette, where he was awarded in 1997 the Hensarling-Chapman Endowed
Professorship in Geology.  He began independent consulting activities in
1991, and in 2001 he left academia for full-time consulting for clients
ranging from one-man shops to supermajors.  James has been an active
researcher, receiving several million dollars in grants from federal,
state, and industry sources, has presented numerous talks, and has
published on a diversity of geoscience topics, including two best paper
awards with GCAGS.  He has been the GCAGS Publisher since 2006 and
Managing Editor since 2011.  In 2018, he founded the Willis School of
Applied Geoscience, reformulating decades of industry training and
networking to provide fast-track industry-ready training for graduate
students at zero cost—he graduates his first student this Spring.





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