六盘山盆地石油地质特征与勘探方向探讨

PETROLEUM GEOLOGICAL CHARACTERISTICS AND EXPLORATION ORIENTATION RESEARCH IN LIUPANSHAN BASIN

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,盆地中南部达到了低成熟—成熟阶段。盆地的石油地质条件有其独特性,燕山期形成的构造、地层圈闭是白垩系以下生油层生成油气聚集的有利场所,白垩系生成的油气主要在喜山期发育的构造聚集。勘探的方向重点是把握三叠—侏罗和白垩系两套含油气系统的特点,围绕海源、固原主要生油凹陷寻找、落实勘探目标。

Iiupanshan basin is a potential area. The oil generating conditions in Tras - Jura are similar to Ordos basin. Very thick dark claystone developed in Cretaceous. It has reached low and maturation stage in middle - south of the basin. The petroleum geologic setting of the basin has its special characteristic. The structures and the stratigraphic traps formed during Yanshan period are a good area for hydrocarbon accumulation of oil generative beds bellowed the Cretaceous. The hydrocarbon generated from the Cretaceous is mainly located in the structural settings developed during the Himalaya orogeny.The main direction of the exploration is to study the characteristic of the two sets of hydrocarbon bearing systems between the Trias - Juras and the Cretaceous. To achieve the goal, the main oil generative deposition along the Haiyuan and Guoyuan area have to be studied.