建昌-喀左盆地石油地质条件初步分析

Preliminary analysis of petroleum geological condition of Jianchang—Kazuo basin

通过野外石油地质调查以及采样分析,结合近年获得的新资料,对建昌-喀左盆地内发育的侏罗系和白垩系地层石油地质条件进行了认识与评价。得出结论为:北票组和九佛堂组有机质丰度较高,为较好烃源岩,生烃母质为腐殖型和腐泥腐殖型,处于低成熟—成熟阶段;储集层为北票组、九佛堂组、沙海组,储层物性差,属低孔低渗储层;发育两套区域盖层,有3种类型的生储盖组合,并见有油气运移的痕迹。四官营子凹陷、建昌凹陷、汤神庙压坳是盆地内油气勘探最有利地区。

Through field investigation of petroleum geology and sample analysis, as well as combinating the new information attained in recent years, the petroleum geological conditions of Jurassic and Cretaceous strata in Jianchang-Kazuo basin were recognized and evaluated. The conclusions are as follow: Beipiao and Jiufotang groups, which are higher in organic abundance and better hydrocarbon rocks, are the main hydrocarbon rocks in the basin, and the hydrocarbon-born material are humic and mud humic patterns, which are in low maturity to maturity. The reservoir strata are Beipiao, Jiufotang and Shahai group whose reservoir characteristics are worse, belonging to low oozing reservoir strata. There two district covers and three types of source-reservoir-cap rock combinations. The oil and gas move marks are seen easily. The best available oil and gas exploration in the basin are Siguanyingzi, Jianchang and Tangshenmiao depressions.