油气地质与采收率2017，Vol.24Issue(6)：54-59,6.
川东南DS地区龙马溪组页岩裂缝发育特征及主控因素
Development characteristics and controlling factors of shale fractures in the Longmaxi Formation in DS area, southeast Sichuan
摘要
Abstract
Fractures developed well in the Lower Silurian Longmaxi Formation in DS area,southeast Sichuan.The develop ment characteristics and controlling factors of shale fractures were studied based on the experimental results of field geological survey,core observation of typical well,homogeneous temperature of inclusions and X-ray diffraction.The results show that there are 2 periods of fracture development in the area.The first period is at the middle-late Yanshan movement,which was dominated by NW compression induced by the rise of Jiangnan Xuefeng uplift,and near EW and SSE X-type conjugate shear fracture in plane and NE longitudinal shear fracture developed.The second period is from the end of Yanshan movement to the Himalayan period,which was dominated by NE compression as a combined effect of the rise of central Sichuan paleo-uplift,Jiangnan Xuefeng uplift and central Guizhou uplift.As a result,NNE and NEE X-type conjugate shear fracture in plane and NW longitudinal shear fracture developed.The development of fractures is mainly controlled by tectonic movement,structural position,rock mechanical properties,lithology and mineral composition.The degree of fracture development is closely related to the distance from the fault,the content of brittle mineral and clay mineral of rock,Young's modulus and Poisson's ratio.关键词
页岩裂缝/发育特征/主控因素/龙马溪组/DS地区Key words
shale/fracture/development characteristic/controlling factor/Longmaxi Formation/DS area分类
能源科技引用本文复制引用
朱梦月,秦启荣,李虎,牛瑞,钟城,黄为,罗振华,何威..川东南DS地区龙马溪组页岩裂缝发育特征及主控因素[J].油气地质与采收率,2017,24(6):54-59,6.基金项目
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). （2017ZX05036003-003）
