摘要
川西地区南部系指四川盆地川西拗陷西南部，面积约１．３万ｋｍ２。该区侏罗系有机碳含量极低，属氧化环境，无生油气能力，但钻井中油气显示普遍，并获工业性气流，具一定的产能和储量。综合研究认为，该区侏罗系形成次生气藏。成藏机制主要是：下伏上三叠统具有丰富的油气资源；多期构造运动所形成的断层、裂缝为天然气的再次运移提供了通道；川西地区具有油气二次运移的动力；具有较好的储集和圈闭条件；上覆盖层良好。进而指出了面积约６５００ｋｍ２的勘探有利区和可供钻探的具体构造。
The south part of West Sichuan. i.e. the southwest port of West Sichuan depression in Sichuan Basin,is about 1. 3x104km2. In such as oxidized environment, the organic carbon content of Jurassic in the area is quite low. without the capability of generating oil or gas. But the gas show is widespread and commercial gas flow is obtained while drilling. It has a certian production capacity and reserve. The authors consider that Jurassic in this area belongs to secondary gas reservoir after studying.The reasons why the secondary gas reservoir can be formed arc that ① the Upper Triassic under Jurassic has abundent oil gas resources; ② structural motions in mult periods had formed passages for the gas to seeondarily migrate: ③ the area in West Sichuan has the dynamic force for secondary migration; ④there are more and better trap structures in the area;⑤ the above structures is good. Finally. the favouring districts and structures for explorating are pointed out in this paper.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1994年第1期23-28,共6页
Natural Gas Industry
关键词
川西地区
侏罗纪
次生油气藏
成因
West Sichuan, Jurassic,secondary gas reservoir, forming mechanism. explorative direction.
