Softening of organic matter in shales at reservoir temperatures

Simon Emmanuel*, Moshe Eliyahu, Ruarri J. Day-Stirrat, Ronny Hofmann, Calum I. Macaulay

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

The elastic modulus of organic matter can strongly influence the mechanical behaviour of source rocks. Although recent advances have shed crucial light on the mechanical properties of natural organic matter under ambient conditions, the elastic properties of kerogen and bitumen at reservoir temperatures remain poorly constrained. In this paper, we use a novel atomic force microscope technique to measure the changes to organic matter during the heating of an organic-rich shale. Our measurements show that bitumen becomes more compliant with heating and in an experiment during which the temperature was increased from 25 to 225°C, the reduced elastic modulus dropped from 6.3 to 0.8 GPa. In contrast to bitumen, we were unable to discern any significant changes to the elastic modulus of kerogen with increasing temperature. Our results suggest that the temperature dependence of the elastic properties could be used as an additional method to differentiate between bitumen and kerogen in shales. Moreover, our analysis indicates that temperature should be taken into account when modelling the elastic properties of bitumen under reservoir conditions.

Original languageAmerican English
Pages (from-to)262-269
Number of pages8
JournalPetroleum Geoscience
Volume23
Issue number2
DOIs
StatePublished - 1 May 2017

Bibliographical note

Publisher Copyright:
© 2017 The Author(s).

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