摘要
湘中拗陷为中扬子地台页岩气研究的重点区域,通过野外露头、有机地球化学及钻井资料,分析该区泥盆—二叠系页岩气资源勘探远景。研究表明,湘中拗陷页岩主要以中泥盆统棋子桥组、上泥盆统佘田桥组、下石炭统大塘阶测水段、二叠系上统龙潭组和大隆组为主。该5套泥质岩及页岩有机碳含量高,有机质类型好,热演化程度高,基本达到成熟—过成熟阶段,是有效页岩气气源岩。同时,该区早古生代沉积环境和后期热演化、构造改造等与美国东部页岩气盆地相似,据此可推断湘中拗陷页岩气勘探潜力较大。
The Xiangzhong depression is the key area of the shale gas studying in mid-Yangtze platform. The exploration prospects of Devonian-Permian for shale gas resource are analyzed based on the outcrop, geochemistry and drilling data. The result show that the shale formations of Devonian-Permian are dominated by the Qiziqiao Formation of Middle Devonian, Shetianqiao Formation of Upper Devonian, Ceshui Member of Datang Stage of Lower Carboniferous, Longtan Formation and Dalong Formation of Upper Permian in the depression. These argillaceous rock and shale characterized by rich organic matter content, favorable kerogen type and high thermal evolution （mature to overmature） are valid source rocks of the shale gas. The sedimentary environment of the Early Paleozoic and the thermal evolution, sectonic reworking in later stages are similar to the shale gas basin in the east of United States. Thus we can infer that this area is rich in shale gas resources.
出处
《油气地球物理》
2013年第2期56-59,共4页
Petroleum Geophysics
关键词
湘中拗陷
页岩气
泥页岩
有机地球化学
Xiangzhong depression, shale gas, mud shale and organic geochemistry
