六盘山盆地石油地质特征与勘探方向

六盘山盆地是油气勘探很有前景的地区,三叠、侏罗系生油条件与鄂尔多斯盆地相似;白垩系发育厚度很大的暗色泥岩,它们在盆地中南部达到了低成熟-成熟阶段。燕山运动期形成的构造、地层圈闭是白垩系以下生油层生成的油气聚集的有利场所;白垩系生成的油气主要聚集在喜马拉雅运动期发育的构造中。应根据三叠-侏罗系和白垩系两套含油气系统的特点,围绕海原、固原主要生油凹陷寻找、落实勘探目标。

Characteristic of Petroleum Geology and Prospecting Targets in Liupanshan Basin.

The Liupanshan basin is a very promising area for oil-gas prospecting. The oil generation condition of triassic and Jurassic are similar to those of Erdos basin. Darkcolor mudstone with great thickness developed well in Cretaceous and it has reached to undermature-matured stage in central and southern area of the basin. The structural trap, and stratigraphic trap which formed in Yanshan movement period are the favorable accumulation environment for oil-gas originated from the source beds below Cretaceous. The Cretaceous-originated hydrocarbon is mainly accumulated in structure developed during the Himalayan movement period. The emphasis of prospecting should be put on how to grasp the features of those two hydrocarbon-bearing systems of Triassic-Jurassic and Cretaceous, to seek and approach the prospecting targets in areas around two principal oil-generation depressions of Haiyuan and Guyuan.