渝东南龙马溪组页岩储集空间特征研究

Research of longmaxi formation shale reservoir space features in the Southeast of Chongqing

开展对解四川盆地东南缘龙马溪组页岩的储集空间特征及其影响因素的研究,有利于页岩气的勘探和开发。在区域地史演化、区域构造、沉积环境调研和分析的基础上,结合岩心、铸体薄片、扫描电镜、X衍射及分析化验资料,对研究区古生界下志留统龙马溪组页岩的矿物成分,储集空间发育特征及类型进行综合分析。研究表明,川东南龙马溪组页岩矿物成分主要包括粘土矿物类、石英、长石等碎屑矿物类、碳酸盐岩类。龙马溪组页岩储集空间类型丰富,包括:粒间孔、粒内孔、有机质孔、溶蚀孔和微裂缝等。

In order to understand the Longmaxi shale reservoir space characteristics and its influencing factors in the southeast margin of the Sichuan basin is beneficial to shale gas＇ s exploration and development. We make a comprehensive study about the Longmaxi shale mineral composition,the feature and type of reservoir space development in the lower silurian series of palaeozoic era,based on the region geologic evolution,regional structure,depositional environment study and analysis,meanwhile to combine cores,casting thin sections,scanning electron microscopy,X- ray diffraction analysis and assay data. Results show that the Longmaxi shale main mineral composition is comprise of clay mineral,quartz,feldspar,mica and other clastic mineral and iron,aluminum and manganese ＇s oxide and hydroxide,carbonate rock type. Longmaxi shale reservoir space includes organic pore,intergranular hole,intragranular pore,intercrystalline hole,porosity,clay minerals interlayer hole,hole biological and micro cracks.