桩106井区馆陶组油气藏形成条件及控制因素

老河口油田桩106地区馆陶组是曲流河道砂体成藏.本文从构造、沉积及储层特征的研究入手,分析了曲流河道砂体油气藏的形成条件、油气藏类型,并寻找该地区河道砂体成藏的控制因素.认为主要含油层系为馆陶组上亚段曲流河河道砂体,主要有上倾尖灭岩性油气藏、透镜状岩性油气藏和构造岩性油气藏等3种油藏类型.丰富优质的油源、优越的油气运聚条件以及良好的储盖组合是该区油气富集的主要原因.盆控断层和输导层共同构成“网毯式”的油气输导体系,对该区馆陶组油气的运聚起到重要的控制作用,储盖组合决定油气富集层位,沉积相变影响储层分布及物性,从而影响含油层系的分布.

Conditions and control factors of hydrocarbon accumulation in Guantao Formation in Zhuang 106 well-block of Laohekou Oilfield

Guantao Formation reservior in Zhuang 106 well-block is the subtle lithological reservoir formed in meandering river environment. Its hydrocarbon accumulation conditions and reservoir types are analyzed from structure, deposition and reservoir characteristics in order to find the control factors of the hydrocarbon accumulation in the fluvial sandbody. It is held that main oil-bearing strata are the meandering river sandstone in upper member of Guantao Formation, and main reservoir types are of updip pinch outlithological trap, lenticular lithological trap and structural - lithological trap. There are rich and high-quality oil source, favourable hydrocarbon accumulation and migration conditions and good reservoir bed - capping bed assembly in this area, which is the reason for the hydrocarbon enrichment in the area. The chief faults and their associated faults form a net-blanket-type hydrocarbon migration path system, which plays a key place in the hydrocarbon migration and accumulation of the Guantao Formation in this area. The reservoir bed - capping bed assembly determines the strata of hydrocarbon accumulation. The sedimentary facies change controls the distribution and the physical property of the reservoir bed, and therefore it controls the distribution of the oil-bearing strata.