四川盆地九龙山构造须二段致密砂岩储层裂缝特征、形成时期与主控因素

doi:10.11743/ogg20120405

Abstract

Abstract:

Physical properties of tight sands in the 2^nd member of Xujiahe Formation in northwestern Sichuan Basin are controlled by structural fractures(SF)formed at different stages.The study on characteristics,timing and controlling factors of the structural fractures can provide useful information for reservoir evaluation and prediction.Identification of cutting relations of the SF on the basis of fracture observation on outcrops,cores and thin sections reveals that the SF can be grouped into NW-SE-trending,NE-trending,NNW-trending,near EW-trending and SEE-trending,of them NW-SE-trending is predominant.At least four stages of SF were identified based on the analysis of the fluid inclusion homogenization temperature of fillings in fractures with different cutting relation and ESR,as well as palaeo-stress data.The first stage is the Late Indosinian,and the SF formed at this stage feature in calcite filling and fluid inclusion homogenization temperature(FIHT)of 84-120℃.The second stage is the Late Yanshanian,and the SF formed at this stage are characterized by quartz filling and FIHT of 72-137℃.The third stage is the Early-middle Himalayan Period and the SF formed at this stage feature in quartz filling,cutting relations with the SF of previous two stags,and FIHT of 153-179℃.The fourth stage is the Late Himalayan Period,and the SF formed in this stage are characterized by coarser calcite fillings with some dolomites and FIHT of 165-190℃.Because of the active tectonic movement during the Indosinian and Himalayan Period,the SF are well developed.The formation and distribution of SF are jointly controlled by tectonic stress and the mechanical property of rocks.Lithic sandstone with high porosity,fine particle and thin layer are favorable for SF development.

Key words: formation timing of structural fracture, tight sandstone, Xujiahe Formation, Jiulong Mountain area, Sichuan Basin

CLC Number:

TE122.2

Bai Bin, Zou Caineng, Zhu Rukai, Zhang Jian, Zhang Benjian, Bi Lina. Characteristics,timing and controlling factors of structural fractures in tight sandstones of the 2^nd member of Xujiahe Formation in Jiulong Mountain structure, Sichuan Basin[J]. Oil & Gas Geology, 2012, 33(4): 526-535.

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Characteristics,timing and controlling factors of structural fractures in tight sandstones of the 2^nd member of Xujiahe Formation in Jiulong Mountain structure, Sichuan Basin

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Characteristics,timing and controlling factors of structural fractures in tight sandstones of the 2nd member of Xujiahe Formation in Jiulong Mountain structure, Sichuan Basin

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Characteristics,timing and controlling factors of structural fractures in tight sandstones of the 2^nd member of Xujiahe Formation in Jiulong Mountain structure, Sichuan Basin