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Book Chapter

A Comparison of Measurement Techniques for Porosity and Pore Size Distribution in Shales (Mudrocks): A Case Study of Haynesville, Eastern European Silurian, Niobrara, and Monterey Formations

By
Milad Saidian
Milad Saidian
Colorado School of Mines, Golden, Colorado, U.S.A. (e-mails: milad.saidian@gmail.com, ukuila@gmail.com, mprasad@mines.edu, saul.rivera.barraza@gmail.com, lemuel.godinez@yahoo.com)
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Utpalendu Kuila
Utpalendu Kuila
Colorado School of Mines, Golden, Colorado, U.S.A. (e-mails: milad.saidian@gmail.com, ukuila@gmail.com, mprasad@mines.edu, saul.rivera.barraza@gmail.com, lemuel.godinez@yahoo.com)
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Manika Prasad
Manika Prasad
Colorado School of Mines, Golden, Colorado, U.S.A. (e-mails: milad.saidian@gmail.com, ukuila@gmail.com, mprasad@mines.edu, saul.rivera.barraza@gmail.com, lemuel.godinez@yahoo.com)
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Saul Rivera Barraza
Saul Rivera Barraza
Colorado School of Mines, Golden, Colorado, U.S.A. (e-mails: milad.saidian@gmail.com, ukuila@gmail.com, mprasad@mines.edu, saul.rivera.barraza@gmail.com, lemuel.godinez@yahoo.com)
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Lemuel J. Godinez
Lemuel J. Godinez
Colorado School of Mines, Golden, Colorado, U.S.A. (e-mails: milad.saidian@gmail.com, ukuila@gmail.com, mprasad@mines.edu, saul.rivera.barraza@gmail.com, lemuel.godinez@yahoo.com)
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Leo Alcantar-Lopez
Leo Alcantar-Lopez
Chesapeake Energy Reservoir Technology Center, Oklahoma City, Oklahoma, U.S.A. (e-mail: Leonardo.alcantar-lopez@chk.com)
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Published:
January 01, 2016

Abstract

Porosity and pore size distribution (PSD) are required to calculate reservoir quality and volume. Numerous inconsistencies have been reported in measurements of these properties in shales (mudrocks). We investigate these inconsistencies by evaluating the effects of fine grains, small pores, high clay content, swelling clay minerals and pores hosted in organic content. Using mudrocks from the Haynesville, Eastern European Silurian, Niobrara, and Monterey formations, we measured porosity and pore or throat size distribution using subcritical nitrogen (N2) gas adsorption at 77.3 K, mercury intrusion, water immersion, and helium porosimetry based on Gas Research Institute standard methodology. We used scanning electron microscope (SEM) images to understand the pore structure at a microscopic scale. We separated the samples from each formation into groups based on their clay and total organic carbon (TOC) contents and further investigated the effects of geochemical and mineralogical variations on porosity and PSD. We find that differences in the porosity and PSD measurement techniques can be explained with thermal maturity, texture, and mineralogy, specifically clay content and type and TOC variations. We find that porosity and PSD measurement techniques can provide complementary information within each group provided the comparison is made between methods appropriate for that group. Our intent is to provide a better understanding of the inconsistencies in porosity measurements when different techniques are used.

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Contents

AAPG Memoir

Imaging Unconventional Reservoir Pore Systems

Terri Olson
Terri Olson
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American Association of Petroleum Geologists
Volume
112
ISBN electronic:
9781629812755
Publication date:
January 01, 2016

References

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