南方古生界3套富有机质页岩矿物组成与脆性分析

Mineral composition and brittleness of three sets of Paleozoic organic-rich shales in China South area

应用XRD技术对南方古生界3套富有机质泥页岩进行了矿物组成测定和脆性分析。结果表明:下寒武统和上二叠统页岩中石英丰富,平均含量分别可达46.65%和44.02%;黏土矿物较低,平均含量分别为30.02%和36.41%。上奥陶—下志留统页岩黏土含量较高,平均值54.95%,石英含量较低,平均值为29.04%。3套暗色页岩脆性指数都较高,下寒武统和上二叠统样品脆性指数平均值分别高达67.06%和59.89%,上奥陶—下志留统页岩脆性指数为44.74%。研究结果说明南方古生界3套富有机质页岩具有良好的可压裂性。

Mineral composition and brittleness analyses were performed on three sets of Paleozoic organic-rich shales from China south area using the X-ray diffraction technology in this study.The results show that quartz is abundant in the Lower Cambrian and Upper Permian shales,with average contents of 46.65% and 44.02% respectively,while their clay minerals components are less,with average contents of 30.02% and 36.41% respectively.However,clay minerals are rich in the Upper Ordovician and Lower Silurian shales,with an average content of 54.95%,while quartz is less,with an average content of 29.04%.The brittleness indexes of the three sets of shales are all high,with 67.06% for the Lower Cambrian shales,58.89% for the Upper Permian shales and 44.74% for the Upper Ordovician and Lower Silurian shales.It is believed that the three sets of the shales are excellent fracturing formation.