川西须家河组致密砂岩储层绿泥石成因及其与优质储层关系

doi:10.11743/ogg20120512

Abstract

Abstract:

Tight gas production is taking up bigger and bigger shares in China’s total natural gas production.However,further exploration and development of this kind of gas reservoirs face great challenges due to their distribution complexity and prediction difficulty.Although the Xujiahe Formation in western Sichuan depression is typical tight sandstone,it has relatively good reservoirs with relatively higher permeability and porosity.Research of these reservoirs reveals a unique phenomenon of the existence of a rim chlorite cementation.Based on analysis of data such as thin section,SEM and X-ray diffraction and in combination with sedimentary facies,regional geology and volcanic activity,the authors determined the period in which the chlorite was formed.It is suggested that the existence of chlorite can effectively protect the primary pores in these reservoirs.However,the sole exis-tence of ring-shaped chlorite cementation does not necessarily mean a relatively better reservoir.Other pre-requirements for a high-quality reservoir are also needed,for example,the ring must be thick and continuous enough and the reservoirs must be formed in high-energy sedimentary environment.

Key words: chlorite, tight sandstone, reservoir, the Xujiahe Formation, western Sichuan depression

CLC Number:

TE122.3

Sun Quanli, Sun Hansen, Jia Bao, Yu Jianjun, Luo Wenjun. Genesis of chlorites and its relationship with high-quality reservoirs in the Xujiahe Formation tight sandstones, western Sichuan depression[J]. Oil & Gas Geology, 2012, 33(5): 751-757.

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Genesis of chlorites and its relationship with high-quality reservoirs in the Xujiahe Formation tight sandstones, western Sichuan depression

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