Abstract:

 Field investigation and explained seismic profiles show that Longmen Mountains thrust belt has very complex structural characters, such as popup, triangle belt, fault related fold and duplex.These structures can form various kinds of hydrocarbon pools and have some regular patterns in their distributions: one is zonation, this means that the distribution of pools made of various kinds of structures are close related to the main faults on Longmen Mountains thrust belt, for example, there should be some faults related to fold type pools between the Beichuan-Yingxiu fault and the Majiaoba- Tongjichang-Shuangshi fault and some triangle belt type pools between the Majiaoba-Tongjichang-Shuangshi fault and the GuangyuanGuankou-Dayi fault, etc.; the other is stratification, which means the detachment layers developed in Longmen Mountains thrust belt have very great influence on the pools’ distribution in profiles, for example, the region on the detachment layers has more types of structural pools than that beneath the detachment layers.

Key words:  structural pool, pop-up, triangle belt, duplex, fault related fold, Longmen Mountains thrust belt, western Sichuan basin