特种油气藏2018，Vol.25Issue(2)：25-30,6.DOI:10.3969/j.issn.1006-6535.2018.02.005
黔江区块龙马溪组页岩气保存条件研究
Shale Gas Preservation Condition of Longmaxi Formation in Qianjiang
摘要
Abstract
Qianjiang block with a relatively low overall exploration level is considered as a major shale gas enrich-ment area in southeast Sichuan. The geology-geophysics technologies are used to explore the shale gas preservation condition in the Longmaxi Formation by combining with hydrocarbon accumulation analysis,structure,cap-rock, formation water,natural gas composition,etc. Research indicates that the fundamental factor for the shale gas loss is the later tectonic movement,including the connection between faults with large and small scales,cap-rock seal-ing and regional cap-rock age. The regional structure is dominated by the NE-NNW faults with a distribution pat-tern of"differentiation in east-west and block in north-south". The gentle southeastern slope area is characterized by less-developed fault and fractures,medium burial depth and high-quality cap-rock. Natural gas composition and formation water properties demonstrates that high-quality cap-rock and structural condition could effective re-duce the shale gas loss and formation water invasion. A set of shale gas preservation indexes is established based on the above understanding to optimize the favorable preservation zones,which could provide certain reference for the shale gas drilling and exploration in the extra-basinal syncline zones.关键词
地质-地球物理技术/保存条件/页岩气/龙马溪组/黔江区块/川东南Key words
geology-geophysics technology/preservation condition/shale gas/Longmaxi Formation/Qianjiang/southeast Sichuan分类
能源科技引用本文复制引用
董清源,田建华,王锦喜,吴斌,刘军..黔江区块龙马溪组页岩气保存条件研究[J].特种油气藏,2018,25(2):25-30,6.基金项目
国土资源部全国油气资源战略选区调查与评价专项"中下扬子及东南地区资源调查评价与选区"(2009GYXQ150) （2009GYXQ150）
中国石化石油物探技术研究院横向课题"黔江页岩气区块三维地震解释及勘探目标优选"(CQKC-201512-155) （CQKC-201512-155）
