川西南部须二段低渗透砂岩储层裂缝类型及其形成序列

曾联波; 李跃纲; 王正国; 李梅

Volume 32 Issue 2

Mar. 2007

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Article Navigation > Earth Science > 2007 > 32(2): 194-200

CENG Lian-bo, LI Yue-gang, WANG Zheng-guo, LI Mei, 2007. Type and Sequence of Fractures in the Second Member of Xujiahe Formation at the South of Western Sichuan Depression. Earth Science, 32(2): 194-200.

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CENG Lian-bo, LI Yue-gang, WANG Zheng-guo, LI Mei, 2007. Type and Sequence of Fractures in the Second Member of Xujiahe Formation at the South of Western Sichuan Depression. Earth Science, 32(2): 194-200.

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Type and Sequence of Fractures in the Second Member of Xujiahe Formation at the South of Western Sichuan Depression

1.
Key Laboratory for Hydrocarbon Accumulation, Ministry of Education, China University of Petroleum, Beijing 102249, China
2.
Faculty of Resources and In for mation Technology, China University of Petroleum, Beijing 102249, China

Received Date: 2006-03-02
Publish Date: 2007-03-25

Abstract

Abstract

Fracture is an important controlling factor for the distribution of natural gas reservoirs in the second member of Xujiahe Formation at the south of western Sichuan depression. Using the data of outcrops, cores, thin sections and image logs, we analyzed the fracture origin types, distribution characteristics and formation sequences. There are three types of fractures, i.e. tectonic fractures, diagenetic fractures and fractures related to overpressure in the low-permeability sandstone reservoirs. Among them, the tectonic fractures are the main. They are mostly shears with four sets of S-N, NE-SW, E-W and NW-SE orientations. Their development degree dies down in turn. But influenced by modern stress field, the fracture of NW-SE orientation is the primary seepage one. Moreover, there are many tension veins filled with asphaltum in the study area. Combined with the analysis of rocky memorial information measured by acoustic emission, it shows there were overpressures in the reservoir rocks in the Middle and Late Cretaceous where the maximum coefficient of formation pressure could reach 1.6-2.1. After the pressure was released in the Middle and Late Neogene, the pressure coefficient decreased to 1.2-1.3. In the basal part of medium-granular sandstone and grit, there developed many approximately horizontal shear fractures related to the thrusting of faults and interlayer sliding under tectonic compression. The tectonic fractures mainly formed in the end of Triassic, Cretaceous and Neogene-Early Pleistocene.
- fracture,
- origin type,
- formation sequence,
- the second member of Xujiahe Formation,
- south of western Sichuan depression

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References(46)

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Type and Sequence of Fractures in the Second Member of Xujiahe Formation at the South of Western Sichuan Depression

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