六盘山盆地含油气系统

THE STUDY OF OIL-GAS-BEARING SYSTEM IN LIUPANSHAN BASIN

六盘山盆地是在元古代结晶基底和加里东褶皱基底之上发育起来的中、新生代小型盆地,盆地纵向发育白垩系、三叠系、石炭系三套烃源岩层系,形成了上、中、下三套含油气系统,其中,T—J含油气系统海固凹陷运聚子系统存在燕山、喜山两次生烃充注,生烃量大,并且与盆地燕山、喜山两期构造主形成期匹配,极有利于圈闭捕获油气成藏,因此,T—J系统形成了盆地最主要的油气勘探目的层系,海固凹陷运聚子系统可作为盆地油气勘探的主攻凹陷,分布于海固凹陷成排成带发育的燕山、喜山期构造是油气勘探的有利区带。

Liupanshan basin is a small Mesozoic and Cenozoic basin which developed on the Proterozoic crystalline basement and Caledonian fold basement. There are three sets of series of strata of hydrocarbon source rock of Cretaceous, Triassic and Carboniferous and formed upper, middle and lower three sets of oil-gas-bearing system. Among them, in the Haigu depression, T-J oil-gas-bearing system had experienced two times of hymn generation and migration in Yanshanian and Himalayan period with great amount of hydrocarbon generation and matching the main developing stage of the Yanshanian and Himalayan sturcture. It is very favorable to form the hydrocarbon trap. So T-J systems are the main exploration target zones of this basin and the Haigu depression can be aimed as the exploration depression. The structures developed in Yanshanian and Himalayan periods in Haigu depression are favorable belts for oil and gas exploration.