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四川盆地上奥陶统五峰组-下志留统龙马溪组黑色页岩是页岩气勘探开发的重要目标层位之一。根据裂缝(节理)产状统计、薄片研究、纳米级扫描电镜研究、脆性矿物含量分析、地球化学分析和岩石力学分析,对四川盆地东南部贵州习水骑龙村五峰组-龙马溪组泥页岩剖面进行研究。整个剖面的裂缝(节理)产状与区域断裂近似一致,走向主要有3组(近东西方向、北西西-南东东方向和北北东-南南西方向),此外还有一组近南北方向的次要节理发育。页岩储层中的裂缝多以微裂缝形式存在。随着抗压强度的增加,岩石微裂缝也被破坏严重,并逐渐形成大规模复杂的裂缝网络体系。平行层理方向上岩石力学性质主要受到地应力的控制。水力压裂若沿着垂直于最大水平应力(北东东-南西西)的方向,可以扩大水力压裂的处理面积。
Upper Ordovician Wufeng Formation - Lower Silurian Longmaxi Formation Black Shale in the Sichuan Basin is one of the important target beds for shale gas exploration and development. Based on the statistics of the occurrences of fractures (joints), thin-sheet studies, nanoscale SEM, brittle mineral content analysis, geochemical analysis and rock mechanics analysis, the mudflats of the Wufeng Formation-Longmaxi Formation in the Xiushikilong Village, southeastern Sichuan Basin Rock profile study. The fractures (joints) in the whole section have similar occurrences to the regional faults, with three main groups (near east-west, north west-south east and north north east-south south west) and a group of sub-north-south To joint development. Most of the fractures in shale reservoirs exist as microfractures. With the increase of compressive strength, the micro-cracks in the rock are also seriously damaged, and gradually formed a large-scale complex fracture network system. The mechanical properties of rock in the direction of parallel bedding are mainly controlled by in-situ stress. Hydraulic fracturing can increase the area treated for hydraulic fracturing if it is along a direction perpendicular to the maximum horizontal stress (NE-CSW).