川西坳陷须家河组二段致密砂岩储层成岩作用与孔隙演化——以大邑地区为例

doi:10.11743/ogg20120215

Abstract

Abstract:

The percentage of gas production from low-permeability gas reservoirs is increasing in China.However,the low-permeability gas reservoirs are geologically complex and can not be predicted easily,impeding their exploration and development.The second member of the Upper Triassic Xujiahe Formation in western Sichuan depression of Sichuan basin has poor poroperm characteristics as a whole and belongs to low porosity and permea-bility reservoirs.Based on the study of reservoir characteristics and diagenesis,this paper determines the filling sequence and relative content of cements of each stage through microscopic observation of thin sections.Characteri-stic inclusions are identified in cements of each stage and used to measure temperature.The results in combination with burial history and thermal history are used to determine the forming time of cements of each stage,hydrocarbon charging time and their sequences.In addition,the paper describes the rate and causes of porosity change in different periods,reconstructs the reservoir forming history and determines the time of reservoir tightening.Finally,this paper presents further exploration targets according to the analysis of hydrocarbon charging history.

Key words: diagenesis, porosity evolution, fluid inclusion, Xujiahe Formation, Dayi area, western Sichuan depression, Sichuan Basin

CLC Number:

TE122.2

Luo Wenjun, Peng Jun, Du Jing’an, Du Lei, Han Haichen, Liu Huan, Li Jianbo, Tang Yong. Diagenesis and porosity evolution of tight sand reservoirs in the 2^nd member of Xujiahe Formation,western Sichuan Depression:an example from Dayi region[J]. Oil & Gas Geology, 2012, 33(2): 287-295,301.

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Diagenesis and porosity evolution of tight sand reservoirs in the 2^nd member of Xujiahe Formation,western Sichuan Depression:an example from Dayi region

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Diagenesis and porosity evolution of tight sand reservoirs in the 2nd member of Xujiahe Formation,western Sichuan Depression:an example from Dayi region

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Diagenesis and porosity evolution of tight sand reservoirs in the 2^nd member of Xujiahe Formation,western Sichuan Depression:an example from Dayi region