【摘要】 通过对龙门山北段地区的野外地质调查,以青川—茂汶,北川—映秀和马角坝—灌县断裂为界,将龙门山北段分为后山带、前山带和山前带。结合地表地质的观察和地震资料的综合解释将龙门山北段地区地腹构造划分为3个构造单元,即地表及浅层推覆构造单元、地腹叠瓦式构造单元以及山前单斜构造单元。根据野外调查分析结合区域钻井资料认为龙门山北段地区纵向发育多套有利的生储盖组合,推覆构造运动一方面为油气运移提供了动力和富集圈闭;同时多次构造运动的叠加破坏了早期形成的油气藏。综合龙门山北段地区构造运动、油气生储盖条件等对油气成藏的影响认为,纵向上地腹二叠系叠瓦构造单元为油气聚集有利区带,而平面上山前的隐伏前锋带是未来的勘探方向。更多还原

【Abstract】 According to the field geology survey of northen section of Longmen mountain,the Qing Chuan~Mao Wen fault,Bei Chuan~Ying Xiu fault and Ma Jiao Ba fault are used as the boundary,the mountain can be divided to back belt,front belt and foothill belt.Combining the surface geology survey and comprehensive interpretation of seismic data,three structural units are divided in the subsurface of northen section of Longmen mountain,they are surface and shallow layer structural units,imbricate unit in subsurface and monocline unit in foothill belt.Based on the analysis of field survey and the drilling data in this area,it seems that there are several suits of source beds,reservoirs and cap rocks in the vertical direction in northen section of Longmen mountain.The thrust movement can provide dynamic force and trap for oil-gas migration,on the other hand,the overlay structural movement can also destroy the early oil-gas reservoir.Combining the affection of structural movement,oil-generating condition,reservoir condition and capping formation condition to the oil-gas aggregation in northen section of Long men mountain,it seems that,the imbricate unit of permain layer in subsurface is a favorable zone for oil-gas accumulation,the buried faults zone in foothill belt are the future exploitation direction in this area.更多还原