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岑巩页岩气区块位于上扬子地台牛蹄塘组主要页岩气富集区,其页岩气勘探潜力巨大。研究区内褶皱、断裂构造发育较好,主要是受北北东和东西方向的影响。本文通过文献检索、野外地质调查、资料收集与整理、地化实验测试等方法,对岑巩页岩气区块下寒武统牛蹄塘组页岩的地层特征、页岩厚度、矿物成分,储集空间类型以及裂缝发育程度等进行研究。结果表明,岑巩页岩区块烃源岩有机质含量高,平均为3.38%;储层具有低孔-超低渗、高比表面积特征;以脆性矿物为主,有利于后期的人为压裂形成裂缝。由此可认为,岑巩页岩气区块具备了较好的烃源岩、储层、埋藏条件,可采资源量大。
The Cengong shale gas block is located in the major shale gas-rich area of the Niutitang Formation of the Upper Yangtze Platform, and has great potential for exploration of shale gas. The fold and fault structure in the study area developed well, mainly due to the influence of the north, east, east and west directions. In this paper, through the methods of literature search, field geological survey, data collection and collation, geochemical experiment, etc., the stratigraphic characteristics, shale thickness, mineral composition, Storage space type and degree of crack development. The results show that the organic matter content of the source rocks in the area of CenGeng shale is high, with an average of 3.38%. The reservoirs are characterized by low porosity-ultra-low permeability and high specific surface area. They are mainly composed of brittle minerals, which are favorable for the later man-made fracturing crack. Therefore, it can be considered that the Shagong shale gas block has good source rocks, reservoirs and burial conditions, and the recoverable resources are large.