CHARACTERISTICS AND MODELS OF HYDROCARBON ACCUMULATION IN XINGLONGTAI OILFIELD, LIAOHE DEPRESSION
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摘要: 利用地球化学、地质资料对辽河坳陷兴隆台地区的成藏特征进行了系统研究,认为研究区具有多油源供烃、多类型输导、多期次充注的特点。油源对比研究表明,油气主要来源于清水洼陷,其次为陈家洼陷,其中清水洼陷沙三段为主要烃源岩。含氮化合物指示油气沿着断层、砂体、不整合面等多种输导体,从生烃洼陷向构造高部位进行运移。流体包裹体与烃源岩生烃史显示研究区发生了多期成藏,主要成藏期为东营末期。综上,建立了以下3种成藏模式:潜山油气藏的"单源供烃、断层-不整合输导、早期成藏模式",沙三段油气藏的"自生自储、断层-浊积砂输导、早期成藏模式"和浅层沙二段、沙一段、东营组油气藏的"多源供烃、断层-砂体输导、晚期成藏模式"。Abstract: The characteristics of hydrocarbon accumulation in Xinglongtai area were studied based on geochemical and geological data. Data shows that the region is characterized by multiple sources, multiple types of conduits and several stages of hydrocarbon charging. Oil-source correlation suggests that the Qingshui sag is the main hydrocarbon generation sag, with the Chenjia sag the next, and the Sha-3 member of the Qingshui sag is also a significant reservoir. Nitrogen compounds indicate that hydrocarbon migrates from the generation sag to the high part of the structure through faults, sands and unconformities. Fluid inclusions and genetic history of source rocks indicate that there are several stages of hydrocarbon accumulation, and the late Oligocene (30.8~24.6 Ma) is the main one. Based on the researches above, three hydrocarbon accumulation models for the Xinglongtai area are established:(1)single source, faults-unconformity conduit, earlier accumulation in buried hill reservoirs; (2)self-source, fault and turbidite sands conduit, earlier accumulation in E2s3 turbidite reservoirs; (3)multi-source, fault-sand conduit, later accumulation in E3s1+2 and E3d reservoirs.
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