| 摘要: |
| 川西坳陷松华镇-白马庙地区须二段气藏为非常规裂缝性气藏，储层以致密碎屑岩为主,有效储层以裂缝为基 础。测井裂缝识别和岩心观察表明,须二段具有北西、北东和东西向3组裂缝,其中北西向裂缝是在北西向区域挤压 应力作用下形成的区域裂缝，另外两组是与局部构造变形有关的构造裂缝。裂缝的形成大致分为印支期、燕山期和 喜玛拉雅期，其中喜玛拉雅期是形成构造裂缝和区域裂缝的主要时期。构造裂缝的发育受岩石本身的力学性质以 及局部构造制约，区域裂缝则与区域应力场强度有关。在现今应力场作用下，北西向裂缝开启性较好，是开发布井 应首先考虑的一组裂缝。 |
| 关键词: 川西坳陷 须家河组 构造裂缝 区域裂缝 成因类型 控制因素 |
| DOI： |
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| 基金项目:国家自然科学基金项目(40272057);国家重点基础研究规划课题(G199904305) |
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| Characteristics and controlling factors of fractures in the second member of Xujiahe formation in Songhuazhen-Baimamiao area of west Sichuan depression |
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YU Hong-feng1,2,WANG Ying-min1,2,ZHOU Wen3
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(1. Key Laboratory for hydrocarbon Accumulation of Education Ministry in China University of Petroleum，Beijing 102249，China;2.Basin and Reservoir Research Center in China University of Petroleum，Beijing 102249, China;3. College of Energy Resources of Chengdu University of Technology, Chengdu 610059，China)
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| Abstract: |
| The gas reservoir of the second member of Xujiahe formation in Songhuazhen-Baimamiao area of west Sichuan depression is non-conventional fracture gas reservoir. It is mainly compact clastic rock and its primary reservoir space is fracture .The investigation on fracture identification through logging and core observation suggest that three sets of fractures develop in the target sequence. One is NW direction of strike, which is regional fracture formed by NW directional regional stress field, the others are NE and EW directions of strike, which are structural fractures generated by the local structure distortion. The carbon and oxygen isotope data show that main epoch of fractures formation may be on Indosinian, Yansha-nian and Himalayan, and the Himalayan is primary period when structural and regional fractures formed. The growth of structural fracture is controlled by such factors as lithology, porosity, lamellation and local structures, and the regional fracture controlled mainly by the regional stress field. Impacted by the present stress field, the NW directional fractures are well opened and should be firstly taken into account when arranging the wells for the exploitation. |
| Key words: west Sichuan depression Xujiahe formation structural fracture r^ional fracture genetic type contiulling factor |
