摘要
川西前陆盆地上三叠统砂体沉积厚度大,范围广,发育巨厚的煤系烃源岩,其油气具有多期成藏、燕山期或喜山期聚集、喜山期调整成藏的特点。岩性油气藏分布范围广,类型多,主要存在的岩性相关气藏圈闭类型有以下几种:构造岩性、砂岩透镜体、古河道、砂岩上倾尖灭、地层超覆、成岩、不整合遮挡岩性圈闭;其岩性圈闭形成以近烃源岩裂缝发育的三角洲砂体发育为基础,良好的成藏配置为关键,适配的古构造提供了油气的聚集部位。
The thickness of sand body for upper Triassic lithologic reservoir in foreland basin of west Sichuan is large and the distribution area is wide. The coal measure source rock developed and the reservoir endured several times of gas accumulation. The gases mainly accumulated during Yanshan and Himalaya stage, and the gas pool is adjusted during Himalaya stage. There are various and abundant lithologic hydrocarbon reservoirs in the foreland basin of west Sichuan. There are seven types of lithologic traps including structural lithoiogic trap, sandstone lens trap, paleochannel trap, sandstone updip pinchout trap, stratigraphic overlap trap, diagenesis trap and unconformity trap. The formation of lithologic trap is based on the delta sand body which is close to the source rock and fracture development, and the key is good reservoir formation allocation. The paleotectonics can provide the space for oil and gas accumulation.
出处
《断块油气田》
CAS
北大核心
2009年第6期1-4,共4页
Fault-Block Oil & Gas Field
基金
国家科技重大专项课题"中国大型气田形成条件
富集规律及目标评价"(2008ZX05007-002)部分成果
关键词
川西前陆盆地
上三叠统
岩性气藏
成藏模式
主控因素
foreland basin in west Sichuan
Upper Triassic
lithologic gas reservoirs
reservoir accumulation mode
main controlling factors.
