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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。
Based on the field geological survey in the northern segment of Longmenshan and the Qingchuan-Maowen, Beichuan-Yingxiu and Majiaba-Guanxian faults, the northern segment of Longmenshan is divided into the hind mountain, fore mountain and piedmont belts. Based on the observation of surface geology and the comprehensive interpretation of seismic data, the tectonic belts of the northern segment of Longmen Mountain are divided into three tectonic units, that is, the surface and shallow nappe tectonic units, unit. According to the field survey and analysis of drilling data in the region, it is considered that there are several sets of favorable reservoir-cap assemblages in the Longmen Mountains, and the nappe tectonism provides impetus and enrichment traps for hydrocarbon migration on the one hand; Overlapping destroyed early formed reservoirs. Synthesizing the northern Longmen Shan tectonic movement, oil and gas reservoirs cover the conditions on the accumulation of oil and gas that the vertical belly Permian shoal tectonic units for the accumulation of favorable hydrocarbon accumulation zone, while the plane uphill before the hilly striker zone is Future exploration direction.