川中地区须家河组泥页岩资源潜力评价

Study on Shale Resources Potential of Xu-jiahe Formation in Central Sichuan Basin

四川盆地中部地区上三叠统须家河组泥岩厚度大,分布范围广,是主力烃源层之一。结合前人研究结果,通过有机地球化学的手段对其泥岩的有机质丰度、母质类型、以及热演化程度地球化学数据等进行分析,对川中须家河组泥页岩的资源量进行计算。研究结果表明,川中地区须家河组,烃源岩岩性以炭质泥岩和黑色泥岩为主,有机质类型以II2-III型混合母质为主,有机质演化阶段主要处于处于成熟~高成熟阶段;须家河组泥页岩的有效页岩厚度大,分布相对较稳定。综合各种因素的影响作用,计算出有效页岩生气强度为3.0~12.0 ×108 m3/km2,资源量3.12 ×108~12.48 ×108 m3。

The upper Triassic Xujiahe Formation in the middle part of the Sichuan basin is characterized by large thickness and wide distribution. It is one of the main source rocks in the three members of the Xujiahe Formation. Combined with the former research results, through the analysis of organic matter abundance, kerogen type and thermal evolution degree of rock geochemical data, the amount of resources of the Xujiahe Formation shale in Sichuan was calculated. The results show that the source rocks of the Xujiahe Formation in Central Sichuan Province are mainly composed of carbonaceous mudstone and black mudstone. The organic matter type is dominated by the mixed material of type II2 and III, and the evolution stage of organic matter is mainly in the mature to high mature stage. The effective shale thickness of the shale in Xujiahe formation is large and the distribution is relatively stable. the Xujiahe Formation in Central Sichuan, mainly carbon mudstone and black mudstone, mainly organic type II 2-type hybrid matrix of them, in the mature to high mature stage;Xujiahe Formation shale effective thickness, stable distribution. The effective shale gas intensity is 3.0~12.0 ×108 m3/km2, and the average resource is about 3.12 ×108~12.48 ×108 m3.