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“5.12”汶川大地震瞬间在龙门山内部形成了长达300km的地层岩石破裂错断,随后又发生余震4万多次,这必然改变其内部的压力疏导系统。地震对川西油气聚散有何影响是大家关心的问题。通过对地震特征、地震破裂与地下流体运移关系的分析,认为龙门山地震对川西地区油气运移聚散有着控制性的影响作用,并提出了一个龙门山地震控制川西油气运移聚散的概念模型。依据该模型分析认为,地震将导致龙门山推覆体地层中油气的散失和川西坳陷天然气的爆发式深生浅储成藏。该模型能较好地解释现今川西天然气藏的一些特点。
“5.12 ” Wenchuan earthquake instantaneous formation of up to 300km stratigraphic rock rupture fault within the Longmen Mountain, followed by aftershocks occurred more than 40,000 times, which inevitably change its internal pressure diversion system. The impact of the earthquake on the hydrocarbon accumulation in western Sichuan is a matter of concern to all. Based on the analysis of the relationship between earthquake characteristics, earthquake rupture and subsurface fluid migration, it is considered that the Longmen Shan earthquake has a controlling effect on hydrocarbon migration and accumulation in western Sichuan, and a Longmenshan earthquake is proposed to control the migration and accumulation of oil and gas in western Sichuan Conceptual model. According to the model analysis, the earthquake will result in the loss of oil and gas in the Longmen Shan nappe formation and the explosive deep-water shallow accumulation of natural gas in the western Sichuan depression. The model can better explain some characteristics of present western Sichuan gas reservoirs.