川东开江古隆起区石炭系气藏成藏机理剖析

ANALYSIS ON THE FORMING MECHANISM OF THE CARBONIFEROUS GAS RESERVOIRS IN THE KAIJIANG PALEOHIGH REGION OF EAST SICHUAN AREA

徐国盛 赵异华

XU Guo-sheng ZHAO Yi-hua

成都理工大学 油气藏地质及开发工程国家重点实验室, 四川 成都 610059 2. 中国石油 西南油气田分公司 川中油气矿研究所, 四川遂宁 629001

States Key Laboratory Resrovoir Geology and development engineering, Chengdu University of Science and Engineering, Chengdu, Sichuan 610059,China 2. Central Sichuan Research Institute of Petroleum Minerals, Southwest Petroleum Fields Branch, CNPC, Suining, Sichuan 629001, China

川东地区是四川盆地稳定地块中的相对构造活动带,区内发育10排高陡构造带,其中主要的含气构造带位于开江古隆起区。川东获得天然气探明储量占全川近60%,使川东尤其是开江古隆起区成为四川乃至全国天然气的主产区。文中着重剖析了形成于开江古隆起区的3类石炭系成组气藏的成藏机理,指出开江古隆起的早期成藏及石炭系丰富的气源为现今大气田和成组气藏的形成奠定了坚实基础;位于开江古隆起顶部的大天池为最有利的富气构造带;继承非均质成组气藏为主要的富气类型。

East Sichuan area is a relative structre mobile belt in the stable blocks of the Sichuan Basin,in which ten lines of high steep structural belts were developed and major gas bearing structural belts are located in the Kaijiang Paleohigh region.The explored reserves of natural gas in East Sichuan area are about 60% of those in the whole Sichuan Province.This makes East Sichuan area,especially the Kaijiang Paleohigh region become the main producing zone of natural gas in Sichuan Province and even in China.In this paper,the forming mechanism of three kinds of the Carboniferous grouped gas reservoirs formed in the Kaijiang Paleohigh region was analysed emphatically.It was pointed out that the pool formation of the Kaijiang Paleohigh in the early stage and the rich Carboniferous gas sources laid a solid foundation for the formation of present great gasfields and grouped gas reservoirs,the Datianchi structural belt in the top of the Kaijiang Paleohigh is the most favorable gas enriched structural belt,and the grouped gas reservoirs of the inheritance anisotropic type are the main gas enriched type.

https://doi.org/10.11781/sysydz200302158