四川盆地石炭系四中心耦合天然气成藏过程  

Allegiance of four centers and pool-forming process of Carboniferous in Sichuan Basin of China

作　　者：徐国盛[1] 徐元刚[1] 刘树根[1] 袁海锋[1] 曹竣锋[1] 杨运会[1] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室(成都理工大学),成都610059

出　　处：《成都理工大学学报（自然科学版）》2011年第4期369-377,共9页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家重点基础研究发展规划(973)项目(2005CB422106);中国石化前瞻性项目(PH08001)

摘　　要：基于四川盆地石炭系天然气成藏经历了四中心(生烃中心、生气中心、储气中心、保气中心)变迁的观点,对石炭系天然气成藏过程重新恢复与梳理。其中,志留系烃源岩因各地进入生烃门限时间不同,使得其在空间上表现为多个生烃中心持续供烃。志留系排出的液态烃进入石炭系开江古隆起区域后,聚集形成大型构造-岩性古油藏。后经深埋,古油藏高温裂解为古气藏,生气中心原位继承性转变为储气中心。喜马拉雅运动后,古隆起解体,即储气中心(大型构造-岩性古气藏)解体,古气藏逸散破坏或重新聚集成今气藏。通过油热裂解气和地层条件下水溶气量的定量模拟,得出川东石炭系气藏之成藏率为9.15%。研究表明,各中心的生成和消亡,都受盆地各次构造运动的控制,而现今气藏形成与分布的关键取决于储气中心解体的局部构造格局与保存条件。Based on the point that the gas pool-forming of Carboniferous in Sichuan Basin transited 4 centers,that is,hydrocarbon-generating center（Silurian hydrocarbon kitchen）,gas-generating center（ancient oil pool）,gas-reserving center（ancient gas pool） and gas-conserving center（nowaday gas pool）,this paper recovers and straightens out the gas pool-forming process of Carboniferous.There are several hydrocarbon-generating centers that continue to supply the hydrocarbons in the area because the hydrocarbon-generating thresholds of Silurian in different regions are different.After the hydrocarbon liquid of Silurian assembled in the Kaijiang palaeohigh,a great structure-lithologic ancient oil pool formed.After deeply buried,the oil pool was split into an ancient gas pool due to high temperatures,and the gas-generating center changed into the gas-reserving center in situ.By the Himalayan movement,the palaeohigh（gas-reserving center） was dismembered,the old gas pool effused and the present gas pool formed.The rate of pool-forming of the Carboniferous gas pool in East Sichuan area is 9.15% through quantitative measurement of oil splitting and water-soluble gas under reservoir conditions.The research demonstrates that the generation and disappear of the centers are controlled by the tectonic movement of the basin and the key to the formation and distribution of the gas pool is the local structure format and feasibility of conservation.

关 键 词：四中心耦合 古隆起解体 热裂解气 石炭系 四川盆地 

分 类 号：TE122.32[石油与天然气工程—油气勘探]