川东南DS地区龙马溪组页岩裂缝发育特征及主控因素

发布时间：2018-01-19 12:30

本文关键词： 页岩裂缝发育特征主控因素龙马溪组 DS地区　出处：《油气地质与采收率》2017年06期 　论文类型：期刊论文

【摘要】：川东南DS地区下志留统龙马溪组页岩裂缝发育,通过野外地质调查和典型取心井岩心观察,结合包裹体均一温度和X衍射等实验测试结果,对裂缝发育特征及主控因素进行研究。结果表明:研究区主要发育2期裂缝,Ⅰ期发生在燕山运动中晚期,主要受江南雪峰隆起NW向挤压,形成近EW向和SSE向平面X型共轭剪切缝和NE向剖面剪切缝;Ⅱ期发生在燕山运动末期—喜马拉雅期,主要受NE向挤压,形成NNE向和NEE向平面X型共轭剪切缝和NW向剖面剪切缝,该期为受川中古隆起、江南雪峰隆起和黔中隆起叠合作用影响。裂缝发育特征主要受构造作用和构造部位、岩石力学性质、岩性和矿物成分等因素影响,其发育程度与距断层的距离、岩石脆性矿物和粘土矿物含量、杨氏模量、泊松比等关系密切。
[Abstract]:Shale fractures developed in Longmaxi formation of Lower Silurian in DS area of southeast Sichuan. Field geological investigation and core observation of typical coring wells combined with the experimental results of inclusion homogenization temperature and X-ray diffraction were carried out. The characteristics of fracture development and the main controlling factors are studied. The results show that the two phases of fractures are mainly developed in the study area, stage I occurred in the middle and late Yanshanian movement and was mainly squeezed in the NW direction of the Xuefeng uplift in the south of the Yangtze River. Forming near EW and SSE plane X conjugate shear fractures and NE profile shear fractures; The second stage occurred in the late Yanshanian movement and Himalayan period, which was mainly squeezed by NE direction, forming NNE and NEE plane X type conjugate shear fractures and NW profile shear fractures, which were the middle paleouplift of Sichuan. The characteristics of fracture development are mainly affected by tectonic action, structural location, rock mechanics, lithology and mineral composition, and the distance between the development degree and the fault. The contents of brittle minerals and clay minerals, Young's modulus and Poisson's ratio are closely related.
【作者单位】：西南石油大学地球科学与技术学院;西南石油大学油气藏地质及开发工程国家重点实验室;天然气地质四川省重点实验室;中国石油塔里木油田分公司;中国石油青海油田分公司采油二厂;
【基金】：国家科技重大专项“四川盆地重点地区应力与裂缝发育规律及评价方法研究”(2017ZX05036003-003) 四川省应用基础研究项目“冲断带前缘地腹高陡逆断裂形成机理及裂缝发育量预测”(2017JX0176)
【分类号】：P618.13
【正文快照】： 页岩气资源在北美地区已取得良好的勘探开发效益,自2005年以来,中国加大了页岩气的勘探开发力度,在四川盆地先后发现了涪陵、威远、长宁和昭通等具有商业性价值的页岩气田。目前川东南DS地区龙马溪组含气页岩储层已成为四川盆地页岩气勘探的热点[1-2]。美国页岩气开发成果表明

【相似文献】