闽西南中二叠统童子岩组页岩气形成的地质条件及远景区预测  

Geological conditions of the Middle Permian Tongziyan Formation and its predicting of prospective areas in southwestern Fujian

作　　者：陈泉霖[1,2] 程乔 冯庆来 邓瑞锦[3] CHEN Quan-lin;CHENG Qiao;FENG Qing-lai;DENG Rui-jin(School of Earth Sciences,China University of Geosciences,Wuhan 430074,China;Fujian Administration of Coal Geology,Fuzhou 350005,China;Fujian Exploration Institute of Coalfield and Geology,Fuzhou 350005,China)

机构地区：[1]中国地质大学地球科学学院,武汉430074 [2]福建省煤田地质局,福州350005 [3]福建省煤田地质勘查院,福州350005

出　　处：《桂林理工大学学报》2020年第2期263-270,共8页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(41530315,41030422,41372213);福建省公益性基础性地质调查项目(GY20140301)。

摘　　要：根据钻孔岩心样品等分析资料,结合闽西南二叠系中统童子岩组有机地球化学在空间上的分布特征,研究了童子岩组页岩气形成地质条件。结果表明:童子岩组泥页岩有机质富集程度较好,其中一段中部以及三段底部是页岩气富集的有利层段;童子岩组一段、二段、三段的有机质成熟度平均值分别为4.56%、4.40%、4.29%,均处于很高的演化程度;有机质类型为Ⅲ型——腐殖型;该组一段、二段、三段泥页岩的脆性指数平均值为48%、43%、49%,具有较好的压裂条件。与美国典型页岩气盆地相比,童子岩组泥页岩孔隙度较低,与国内四川盆地筇竹寺组则相接近;童子岩组泥页岩的渗透率条件总体良好。永定-龙岩、龙岩-漳平、永安-大田以及永安市附近的4块远景区,可作为福建页岩气下一步工作的重点区域。Based on analysis data of borehole core samples and the spatial distribution characteristics of organic geochemistry of the Permian Middle Tongziyan Formation in the southwestern Fujian,the geological conditions of shale gas formation in Tongziyan Formation are studied.The results show that the shale of Tongziyan Formation has a good organic-rich degree,in the middle of Member 1 or at the bottom Member 3 there are favorable intervals for shale gas enrichment.The average organic matter maturity(Ro)of Member 1,2 and 3 of the Tongziyan Formation is 4.56%,4.40%,and 4.29%,respectively,all of them are in a high degree of evolution.The type of organic matter is typeⅢ:humus type.The average brittleness index of shale for Member 1,2 and 3 of Tongziyan Formation is 48%,43%and 49%,with good fracturing conditions.Compared with typical shale gas basins in the United States,the shale porosity of Tongziyan Formation is lower,similar to that of Qiongzhusi Formation in Sichuan Basin in China.The shale of Tongziyan Formation has a good permeability.Four prospective areas of Yongding-Longyan,Longyan-Zhangping,Yongan-Datian and near Yongan city are proposed as the key region for further work.

关 键 词：页岩气 形成条件 远景区 童子岩组 二叠系 闽西南 

分 类 号：P618.13[天文地球—矿床学]