苏里格气田上古生界主要含气层系粘土矿物分布及其主控因素

doi:10.11743/ogg20120511

Abstract

Abstract:

Clay minerals distribute widely in the gas reservoirs of the 8^th member of the Shihezi Formation and the 1st member of the Shanxi Formation in the Upper Paleozoic of the Sulige gas field in Ordos Basin.The study of clay mineral content changes and main controlling factors plays a very important role in the low-permeability reservoir stimulation and protection.Based on a comprehensive study of data such as X-ray diffraction,thin sections and cast thin sections of clay minerals,and so on,we proved that the clay minerals in the 1^st member of Shanxi Formation and the upper and lower 8^th member of the Shihezi Formation are mostly chlorite,illite,kaolinite and illite-smectite mixed-layer.The horizontal and vertical distributions of these minerals are studied with the single factor analysis method and the main controlling factors for their distribution difference are also analyzed.The results show that the mother rocks in different provenance regions determined their original composition,climate condition changes from relatively warm and wet to dry controlled their weathering and alteration degrees,and strong hydrodynamics,proper pH value and weak reductive environment of fluvial sedimentary environment provided favorable conditions for their deposition,transformation as well as preservation.However,the increase of illite content from alteration of feldspar during the late diagenetic stage B caused the lowering of reservoir quality.

Key words: clay mineral, gas-bearing layer, Upper Paleozoic, Sulige gas field, Ordos Basin

CLC Number:

TE122.2

Li Mingrui, Zhang Qing, Duan Hongzhen, Deng Jie. Clay mineral distribution and its controlling factors in the Upper Paleozoic gas reservoirs of Sulige gas field[J]. Oil & Gas Geology, 2012, 33(5): 743-750.

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Clay mineral distribution and its controlling factors in the Upper Paleozoic gas reservoirs of Sulige gas field

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