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Effect of pyrolysis on elastic properties and microstructure of organic-rich Mancos shale

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Authors
Pervukhina, M.
Uvarova, Y.
Dautriat, J.
Dewhurst, D.
Patrusheva, N.
Lebedev, Maxim
Date
2014
Type
Conference Paper

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Pervukhina, M. and Uvarova, Y. and Dautriat, J. and Dewhurst, D. and Patrusheva, N. and Lebedev, M. 2014. Effect of pyrolysis on elastic properties and microstructure of organic-rich Mancos shale. SEG Technical Program Expanded Abstracts. 2014: pp. 2866-2870.
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SEG Technical Program Expanded Abstracts 2014
Source Conference
SEG International Exposition and 84th Annual Meeting
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Department of Exploration Geophysics
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Abstract

We have studied changes of static and dynamic elastic properties of the organic-rich Mancos shale caused by heating to the temperature within the range 380°C-550°C. An increase of ultrasonic velocities and static Young's moduli has been observed in the samples that experienced temperatures up to ~400°C. Further heating to temperatures up to 550°C has led to the decrease of elastic moduli. The samples subjected to temperatures above 430°C show an increase in stress sensitivity, which implies microcrack generation. Micro-CT images of small samples have been obtained to inspect the microstructural changes caused by this dry pyrolysis. Comparison of the registered micro-CT images of Mancos shale samples subjected to temperatures up to 470°C shows significant shrinkage of the kerogen that fills pore spaces resulted from bitumen expulsion into the pores.