廊固凹陷河西务构造带断裂特征与油气成藏

河西务构造带断裂发育,与油气运聚成藏密切相关。本文通过对构造带断裂特征进行分析,进一步阐明了断裂与油气聚集的关系。河西务断层活动强度大、持续时间长,不同位置活动强度和活动时期差异使构造带演化具有分段性特征,南部形成时间较早,中深层（Ek-E s3）含油气;北部较晚,浅层含油气（E s2-Ed）。不同层段断层封闭性具有规律性,中深层反向断层封闭性好,浅层反向、顺向断层封闭性取决于断距和两侧岩性配置关系。河西务断层不控制油气分布,次级断层控制;断层封闭性好有利于油气聚集。

Faults Feature and Hydrocarbon Accumulation in Hexiwu Structural Belt of Langgu Depression

exiwu structural belt is developed in faults that are closely linked with hydrocarbon migra- tion and accumulation. In this paper, through the analysis of faults feature, the relationship between the fracture and hydrocarbon accumulation is further clarified. Hexiwu Fault exercised in intensity and strength. The belt has a evolution of sub--belt characteristics because of the differences in activity intensi- ty and time at different locations o The Southern part formed earlier and the deep layer （Ek--Es3） saved hy- drocarbon~ the north part was later and shaIlow layer （Es2--Ed） saved. The fault sealir~g property has a regularity in different layers. In the deep, antithetic fault sealing is good in the shallow, antithetic and consequent fault sealing depends on the fault distance and lithology on both sides. Hexiwu fault does not control hydrocarbon distribution, secondary faults do; the fault sealing is favorable for hydrocarbon accumulation.