【摘要】 以三维地震资料、钻井资料分析以及流体包裹体资料为基础,分析锦州25-1大型轻质油气田基本成藏条件,并对其生烃史、排烃动力、成藏期次、油气充注过程进行研究。结果表明:锦州25-1油气田是一个优质的大型油气田,其形成的基本条件是该区具有多成因的大型圈闭群、充足的烃源岩条件以及理想的储盖组合;烃原岩排烃的主要动力是干酪根向油转化所产生的孔隙流体压力,孔隙流体压力的周期性累积和释放是油气幕式充注的主要原因;油气大规模充注成藏的时期是东营组末期(21～25 Ma);油气主要来自锦州25-1构造南北两翼的辽西北洼和辽西中洼;双灶供烃、超压-持续强充注、高效输导、理想储盖4因素耦合是研究区形成大型优质油气田的根本原因。更多还原

【Abstract】 Based on 3D seismic data,drilling and fluid inclusion data,Jinzhou 25-1 large-scale oil-gas field formation conditions were analyzed.The hydrocarbon generation history,hydrocarbon expulsion dynamics,hydrocarbon accumulation period and hydrocarbon charging history of the field were researched.The results show that Jinzhou 25-1 oil-gas field is a perfect large-scale light gas-oil field and its basic formation conditions include multiple genesis large-scale trap group,abundant hydrocarbon source rock and perfect reservoir-cap combination.The hydrocarbon expulsion dynamic in the source kitchen is the pore fluid pressure produced by the transformation from kerogen to hydrocarbon.The episodic accumulation and release of the pore fluid pressure is the main reason of the hydrocarbon episodic charging.The main pool forming period of the field is lateral period(21-25 Ma) of Dongying group deposition.The hydrocarbon source of the oil-gas field is from the north sub-sags and middle sub-sag of Liaoxi sag.The major reason of the large-scale gas-oil field formation in the area is the matching of the hydrocarbon supplying from the double source kitchen,sustained strong charging from overpressure source,high effective transforming and perfect reservoir-cap combination.更多还原