A New Method of Explaining the Water Saturation of Low Resistivity Reservoir with Complex Pore Structure

doi:10.11885/j.issn.1674-5086.2016.06.26.01

Abstract

Abstract: The gravelly sandstone reservoirs of the Liusha Formation in Wushi, Beibu Gulf are subject to complicated changes in lithology, sorting and distribution of pore throats, the resistivity of the oil layer is lower than that of the mudstone and is similar to that of the water layer, the porous tube microstructure model was used to simulate the response of pore structure and rock resistivity. It is proved that the complex pore structure of rock is an important reason for the formation of peculiar low resistivity reservoir of gravel sandstone. The Archie correction equation is proposed based on experimental "bent" rock electrical data caused by complex pore structures. The modified Archie formula is applicable to reservoirs with different pore structures. The Wushi A Oilfield gravel sandstone reservoir is evaluated by a new method, can effectively improve the oil saturation, and the results are more compatible with core capillary pressures and NMR-bound water.

Key words: gravel bearing sandstone, ball tube model, pore structure, bent rock resistivity, Archie formula

CLC Number:

TE51

ZHANG Hengrong, HE Shenglin, ZHENG Xiangwei, HU Xiangyang, ZENG Shaojun. A New Method of Explaining the Water Saturation of Low Resistivity Reservoir with Complex Pore Structure[J]. 西南石油大学学报(自然科学版), 2018, 40(1): 97-103.

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