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基于地质类比方法,综合运用地质、地球物理、地球化学等资料及盆地模拟技术恢复了西湖凹陷中部地区油气成藏动力学过程.结果表明:研究区内沉积充填和构造沉降具有幕式演化特征,并以始新世地层沉积厚度最大、沉积-沉降速率最高;烃源岩有机质热演化具有成熟时间短、生油窗窄、生气窗宽的特点;主力烃源岩平湖组进入成熟生烃门限的时间早,生排烃能力强,且生排烃过程发生在晚渐新世至早-中中新世期间;研究区油气运移和油气聚集主要受控于古构造面,保俶斜坡带和天屏断裂陡坡带以平行流为主,中央背斜带以汇聚流为主,存在多个有利油气聚集区,油气聚集作用主要发生在龙井运动(7Ma)以来.
Based on the geological analogy method, synthetically using the data of geology, geophysics and geochemistry, and the basin simulation technology, the dynamic process of hydrocarbon accumulation in the central part of the Xihu sag is restored.The results show that the sedimentary filling and tectonic subsidence in the study area have the episodic evolvement characteristics, And the sedimentary-sedimentation rate is the highest in the Eocene strata. The thermal evolution of organic matter in the source rock has the characteristics of short mature time, narrow oil generation window and wide angry window. The main source rocks of the Pinghu Formation have entered the mature hydrocarbon generation threshold As time goes by, the hydrocarbon generation and expulsion ability is strong, and the process of hydrocarbon generation and expulsion occurs during the Late Oligocene to Early-Middle Miocene. The hydrocarbon migration and hydrocarbon accumulation in the study area are mainly controlled by paleo-structural surface, The steep slope of the Tianping fault is dominated by parallel flow, while the central anticline is dominated by convergent flow. There are several favorable hydrocarbon accumulation areas. The hydrocarbon accumulation mainly occurs in the Longjing movement (7Ma).