车排子地区春风油田稠油成藏模式

Discussion on the accumulation mode of heavy oil in the Chunfeng oilfield of Chepaizi area

通过对车排子地区春风油田稠油的物性和地球化学特征的分析研究,认为稠油主要是来源于二叠系的原油后期遭受生物降解作用形成的,并伴随着一定的水洗和氧化作用。通过对稠油储层流体包裹体特征、烃源岩的生排烃史、储层成岩作用和构造运动的综合分析,认为研究区稠油为车拐断裂带古油藏调整的产物,稠油油藏的成藏模式为远源阶梯状输导次生成藏模式,早期生成的油气聚集后发生次生调整,通过断层和不整合面运移到春风油田,晚期又遭受生物降解,形成稠油油藏。

Through detailed study of physical prosperities and geochemical characteristics of heavy oil in Chunfeng oilfield of Chepaizi area,heavy oil mainly comes from source rock of Permian,companying with some water bath and oxidation. After integrated analysis of the reservoir fluid inclusion characteristics,the generation and expulsion history of the source rock and the diagenesis of the reservoir rock and structure movement,heavy oil has been found to be the product of ancient reservoir adjustment.The accumulation mode is far source and stepped migration mode.The oil from Permian first accumulated in the Cheguai faulted belt,the structure movement result in the destroy and reconstruct of the reservoir,the hydrocarbon migrated to the Chunfeng oilfield.Later,under biodegradation,heavy oil reservoirs were formed.