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Petroleum Geoscience; February 2006; v. 12; no. 1; p. 49-57; DOI: 10.1144/1354-079305-665
© 2006 Geological Society of London
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Original Article

Rock physics modelling of shale diagenesis

Anders Dræge, Morten Jakobsen and Tor Arne Johansen

Centre for Integrated Petroleum Research, University of Bergen and Department of Earth Science, University of Bergen, Allegaten 41, 5007 Bergen, Norway

A model for estimating the effective anisotropic properties of cemented shales is presented. The model is based on two mathematical methods for estimation of effective properties of a composite medium; a self-consistent approximation and a differential effective medium model. In combination these theories allow approximation of a shale with connected clay minerals and cement, and disconnected pores and quartz grains, which can be compared with the conditions in a real cemented shale. A strategy is also presented for estimation of stiffnesses in the transition zone from mechanical compaction to chemical compaction dominated diagenesis. Combining these theories with a shale compaction theory, enables modelling of the effective elastic stiffnesses for shales from deposition and mechanical compaction to deep burial and chemical compaction/cementing. Results from the model were compared with velocity data from three wells, showing good fit for velocity predictions, following the main velocity trends with increased temperature and depth.

KEYWORDS: shale, diagenesis, anisotropy, velocity, cementation, rock physics




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[Abstract] [Full Text] [PDF]


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