鄂尔多斯盆地合水地区长7致密油储层伊利石成因

doi:10.11743/ogg20130518

Abstract

Abstract:

Chang 7 reservoir in Heshui area,Ordos Basin is a typical tight oil reservoir with high content of illite up to 9.1%,which is the key factor controlling the quality of reservoir.Analyses of the composition,distribution and occurrence of illite through SEM,EDS,cast thin section and X-diffraction show that the Chang 7 reservoir is very fine turbidity sandstones.The pervasive dissolution of K-feldspar yield lots of secondary pore which is the main pore type.The illites are complex in chemical composition and are mainly in scattered,chaotic sheet-like shape.They only occur in residue intergranular pores.And their content increases with the decreasing of grain size.In comparison with the adjacent shales,the relative content of clay mineral is similar,but the K-feldspar/plagioclase ratio is smaller.Volcanic activities were very intense during the deposition of Chang 7,which provides the favorable condition for semctite development at the early diagenetic stage.The semctites were transformed to illites subsequently.This process may be the main genesis of illite in Chang 7,as illitization of smectite is very common.In addition,the palaeo-geotemperature in the study area is generally lower than 120 ℃ and there are no external potassium-rich hot fluid input,making it impossible for the formation of illite of other genesis.

Key words: tight oil, illite, reservoir characteristics, Chang 7 oil reservoir, Heshui area, Ordos Basin

CLC Number:

TE122.2

Tian Jianfeng, Gao Yongli, Zhang Pengbo, Wang Xiujuan, Yang Youyun. Genesis of illite in Chang 7 tight oil reservoir in Heshui area,Ordos Basin[J]. Oil & Gas Geology, 2013, 34(5): 700-707.

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Genesis of illite in Chang 7 tight oil reservoir in Heshui area,Ordos Basin

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