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Evaluating Electrical Anisotropy Parameters in Miocene Formations in the Cierpisz Deposit

Bała M., Cichy A.

Acta Geophysica

2015

Vol. 63, no. 5

1296--1315

The electrical anisotropy of rocks is generally an effect of alternating layers of thin-bedded sandstones and shales with clear lamination. Thin-bedded rock sequences can be treated as an anisotropic medium described by two resistivities: horizontally to the bedding RH and vertically to the bedding RV. Such sequences have fairly low resistivity and, as a result of poor vertical resolution of conventional electric tools, one can sometimes fail to distinguish them from the adjoining shales. This paper presents the possibility of calculating the anisotropy parameters based on resistivity logs recorded with a laterolog tool (DLL) and an induction tool HRAI. We have also performed an analysis of the ambiguity of the results and attempts to assess the water saturation (SW) generating cross-plots based on calculated resistivities, RH and RV. It is very important to correctly evaluate the resistivity of sandstone interbeds when calculating water saturation (SW) and hydrocarbon saturation (SG), in formulating an integrated quantitative interpretation of anisotropic formations.

Czy anizotropia elektryczna może być wywołana zmianami nasycenia wodą i gazem w mikro- i makroporach skał miocenu?

Bała M.

Przegląd Geologiczny

2013

Vol. 61, nr 9

523--531

The paper presents the problem of evaluation of variation in the electrical anisotropy coefficient for sandstone-shaly Miocene deposits depending on water and gas saturation of the pore space. A rock model built of alternating layers with varying micro- and macroporosity is discussed. This may correspond to a rock formation composed ofparallel thin layers of sandstones or mudstones and claystones, which are dominated by macro- and micropores, and are characterized by different grain size or grain sorting. The anisotropy coefficient is then affected by changes in electrical resistivity in individual layers that are a result of changes in saturation.