阜新盆地石油地质特征

PETROLEUM GEOLOGICAL CHARACTER OF FUXIN BASIN

刘建英 王世云 尹继宏

Liu Jianying Wang Shiyun Yin Jihong

阜新盆地是晚侏罗-早白垩世的地堑型断陷盆地,面积约2000km。主要受北北东向和北西向两组同生断裂控制,其沉积最大厚度约6000m。九佛堂组和沙海组三、四段为主要生油层,其中所夹扇三角洲砂体及水下重力流砂体为有利储集层,具一定的含油远景。

Fuxin Basin is a graben-type basin that covers an area of 2000 km formed on Pre-cambrian basement during Late Jurassic-Early Cretaceous.Contemporaneous faults could be primarily classified into two groups such as NNE-stretching and NW-stretching faults.The former controlled the thickness and distribution of Upper Jurassic,and the later con-trolled the distribution of coal-rich zones and local structures.The Jiufotang Formation and the third-fourth member of the Shahai Formation are the main source rocks whose organic matter is mainly type-Ⅱ,and the threshold depth of oil-generation that is calcu-lated with average 3.93℃/100m of geothermal gradient is 1350 m.Reservoirs occupy 70% of the total sediment thickness,in which sandbodies of fan-delta and subaqueus gravity-flows are more favourable for hydrocarbon preservation.

10.11743/ogg19920411