HYDROCARBON PRESERVATION CONDITIONS IN LONGMEN MOUNTAIN, WEST SICHUAN BASIN

Based on researches of hydrocarbon in thrust nappe belt at home and abroad,from aspects such as tectonic deformation,cover,and relationship between hydrocarbon and preservation,studies of oil-and-gas preservation have been carried out in the Longmen Mountain thrust nappe belt.Main controlling factors of accumulation have been summarized.On the basis of zone evaluation,it has been pointed out that,the east to the Jiangyou-Dujiangyan fracture is favorable for hydrocarbon preservation and accumulation.Tectonic deformation preservation model of the Longmen Mountain thrust nappe belt has been set up.Evaluation methods and index adapted to the study area have been concluded.The Shanbantan and Yazihe anticlines have been predicted as favorable exploration targets.