松辽盆地北部长春岭背斜带油气成藏探讨

摘要

There are several different views on the hydrocarbon accumulation process of the Changchunling Anticline in the northern Songliao Basin, such as oil source and oil and gas reservoir accumulation time. On the base of previous studies, from geochemistry, structure, sedimentation and hydrocarbon distribution, combining with thermal history and hydrocarbon generation history,hydrocarbon accumulation process is discussed in this paper. It is suggested that the oil of the Changchunling Anticline comes mainly from the first Member of the Qingshankou Formation, Lower Cretaceous, in the Wangfu Depression; natural gas is mainly from the deep coal bearing strata in the fault depressions on both sides; natural gas began to accumulate at about 85～77.4 Ma, the main accumulation period of oil reservoir is about from 75 to 67Ma. The gas reservoir formed earlier than the oil reservoir.%针对松辽盆地长春岭背斜带油气来源,油藏、气藏形成时期先后等问题仍存在分歧的研究现状,在前人研究的基础上从地球化学、构造、沉积、油气分布等方面出发并结合热史、生烃史,探讨松辽盆地北部长春岭背斜带油气成藏过程.研究认为:长春岭背斜带原油主要来源于王府凹陷上白垩统青山口组-段烃源岩,气源主要为两侧断陷深层煤系地层;天然气大约在85～77.4Ma开始聚集成藏,油藏主要成藏期约为75～67Ma,气藏成藏时期早于油藏.