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从油气形成条件分析入手,对大民屯凹陷法哈牛—曹台地区太古宇潜山油气成藏控制因素进行研究。研究结果表明,油源条件是决定基岩潜山圈闭能否成藏的关键,研究区具备良好的油源条件;在侧向供油的情况下,与潜山接触的烃源岩的深度控制了潜山油气藏的底界深度。储层是控制油气富集程度的重要因素,太古宇潜山储层岩性主要为变质岩,储层类型为裂缝型,以构造裂缝为主,裂缝控制着油气的富集程度。构造条件在潜山圈闭形成及储层发育过程中起到了重要的作用,同时,构造运动过程中形成的断层在沟通烃源岩及油气在潜山内部的运移中起到了通道作用。封闭条件是油气成藏的必要条件之一,对油气藏的分布起到一定的控制作用。研究区发育的泥岩、非渗透层及凝固的高凝油层等为油气藏的形成提供了良好的封闭条件。
Beginning with the analysis of oil and gas formation conditions, the controlling factors of hydrocarbon accumulation in the Archean Buried Hill in Faha Niu-Caotai area in the Damintun Depression were studied. The results show that oil source conditions are the key factors that determine whether the buried bedrock of the bedrock can accumulate or not, and the study area has good oil source conditions. In the case of lateral oil supply, the depth of the source rock in contact with the buried hill Controls the depth of the bottom of buried hill reservoirs. The reservoir is an important factor controlling the degree of oil and gas accumulation. The lithology of the Archean buried hill reservoirs is mainly metamorphic rocks. The reservoir type is fracture type, which is dominated by structural fractures, and the fractures control the enrichment degree of oil and gas. The tectonic conditions played an important role in the formation of buried hills and the development of reservoirs. At the same time, faults formed during the tectonic movement played a role in channeling the source rock and the migration of oil and gas inside the buried hill. Closure conditions are one of the necessary conditions for oil and gas accumulation and play a certain role in controlling the distribution of oil and gas reservoirs. The developed mudstone, non-permeable layer and solidified high-oil-formation layer in the study area provide a good sealing condition for the formation of oil and gas reservoirs.