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Pore-scale Analysis of Electrical Properties in Laminated Rock Using Digital Rock Physics
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 76th EAGE Conference and Exhibition 2014, Jun 2014, Volume 2014, p.1 - 5
Abstract
A significant percentage of the world’s estimated hydrocarbon reserves are contained in thinly layered reservoir formations. In order to analyze the electrical properties of laminated rocks, a laminated digital rock is reconstructed via process-based method. Then a finite element method special designed to analysis the electrical properties of porous media is imposed on the model. Differing from the electrical properties of homogenous rock, the RI-Sw curve of laminated rock does not show a linear relationship, due to the bedding effect and anisotropy. The RI-Sw curve can be divided into two linear segments with different saturation exponent. The first segment with lower slope is at high value of water saturation, and the second one with higher slope is at low water saturation. If we take the capillary pressure into consideration, the first segment of RI-Sw curve with low value of slope should correspond to macro-porous layers and the high slope segment should correspond to the micro-porous layers. Traditional Archie equations cannot well describe the electrical behavior of laminated rock partially saturated with formation water. Therefore, the electrical behavior of laminated rock should be considered in calculating water saturation.