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Multiparametric Modelling of Anisotropic Elastic Properties of ShalesNormal access

Authors: A. Yurikov, M. Pervukhina, R. Beloborodov and M. Lebedev
Event name: 81st EAGE Conference and Exhibition 2019
Session: Seismic Interpretation - Rock Physics II
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201900806
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1020.5Kb )
Price: € 20

Summary:
Anisotropic elastic properties of shales are important for understanding of shale compaction trends, improved seismic to well tie, non-hyperbolic moveout correction, and serve as a baseline for predicting properties of organic-rich shales. However, no predictive models of elastic properties of shale have been developed so far due to a multiparametric nature of such modelling problem and the fact that effects of some parameters of shales are poorly understood. The large number of parameters required for prediction of elastic properties of shales stems frommulticomponent nature of these rocks, as shales are composite media comprising clay particles of different mineralogy and silt. The complexity of the system is complemented with the pores of micro to nano-scale, which shape and orientation is poorly understood. In this study, we use the elastic moduli of two artificially compacted samples with controlled composition and porosity to understand the parameters that affect elastic properties of shales and to establish a predictive modelling workflow. We invert the elastic properties of an individual kaolinite particle and perform a forward modelling taking into account the effect of reorientation of particles due to compaction, the effect of porosity reduction, the effect of silt fraction and the properties of contacts between particles.


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