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Rock physics modelling of shale diagenesis Normal access

Authors: Anders Dræge, Morten Jakobsen and Tor Arne Johansen
Journal name: Petroleum Geoscience
Issue: Vol 12, No 1, February 2006 pp. 49 - 57
DOI: 10.1144/1354-079305-665
Organisations: Geological Society of London
Language: English
Info: Article, PDF ( 7.82Mb )
Price: € 30

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.

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