Joint elastic-electrical effective medium models of reservoir sandstones

Han, Tongcheng; Best, Angus I. ORCID:; MacGregor, Lucy M.; Sothcott, Jeremy; Minshull, Tim A.. 2011 Joint elastic-electrical effective medium models of reservoir sandstones. Geophysical Prospecting, 59 (4). 777-786.

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Improvements in the joint inversion of seismic and marine controlled source electromagnetic data sets will require better constrained models of the joint elastic-electrical properties of reservoir rocks. Various effective medium models were compared to a novel laboratory data set of elastic velocity and electrical resistivity (obtained on 67 reservoir sandstone samples saturated with 35 g/l brine at a differential pressure of 8 MPa) with mixed results. Hence, we developed a new three-phase effective medium model for sandstones with pore-filling clay minerals based on the combined self-consistent approximation and differential effective medium model. We found that using a critical porosity of 0.5 and an aspect ratio of 1 for all three components, the proposed model gave accurate model predictions of the observed magnitudes of P-wave velocity and electrical resistivity and of the divergent trends of clean and clay-rich sandstones at higher porosities. Using only a few well-constrained input parameters, the new model offers a practical way to predict in situ porosity and clay content in brine saturated sandstones from co-located P-wave velocity and electrical resistivity data sets.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 00168025
Additional Keywords: Clean and shaly reservoir sandstones; Effective medium models; Joint elastic-electrical properties
Date made live: 23 Jun 2011 12:38 +0 (UTC)

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