南堡油田中浅层油气成藏主控因素研究

Research on the Main Controlling Factors of Hydrocarbon Accumulation in Mid-Shallow Layer of Nanpu Oilfield

摘要: 在地震、测井和地质录井等资料分析的基础上，应用断层活动性和封闭性的定量评价、波阻抗储层反演等方法，对渤海湾盆地南堡油田中浅层油气成藏主控因素进行了研究。结果表明：古近系东营组一段、新近系馆陶组和明化镇组是南堡油田中浅层的主要富集层系，以构造油气藏为主，总计发育23条油源断层，油源断层控制中浅层油气藏在平面上的宏观分布。研究区馆陶组局部发育火成岩，厚值中心达400 m，火成岩的发育有利于油气垂向和侧向封堵，火山岩厚度与断距的配置关系是造成油气在纵向上差异分布的主控因素。泥岩涂抹作用和断层面两侧岩性的对置关系对油气保存起重要作用，形成断层侧向封堵的条件为SGR > 40%，油气在砂岩–泥岩对置或砂岩–火山岩对置的有利圈闭中富集，波阻抗异常高的储层油气显示情况较好。基于南堡油田中浅层油气成藏要素分析，指出南堡4号构造带、南堡2号构造带东部和南堡3号构造带是下步有利勘探区。

Abstract: Based on the data of seismic, well logging and geological logging, research on the main control-ling factors of hydrocarbon accumulation in mid-shallow layer of Nanpu oilfield were studied by using quantitative evaluation of fault-activity & fault-seal, technologies of wave impedance refu-tation of reservoir. The results showed that hydrocarbon of Nanpu oilfield in Bohai Bay basin was mainly enriched in the strata of 1st Member of Dongying Formation in Paleogene, Guantao Formation and Minghuazhen Formation in Neogene, and structural hydrocarbon reservoir is the main type. Totally 23 oil-source faults are developed, which control the macro distribution of mid-shallow reservoirs in the plane. In the research area, igneous rocks are locally developed in Guantao Formation, and the thickness center reaches 400 m. The developed igneous rock is favor of horizontal and vertical sealing of hydrocarbon. The relationship between volcanic rock thickness and fault spacing was the main control factor that caused the longitudinal differential hydrocarbon distribution. Mud smear and the opposing relationship of lithology on both sides of fault plane play an important role in hydrocarbon preservation, and the condition formed fault-seal was smear gouge ratio which is more than 40%. Hydrocarbon is enriched in the traps with favorable configuration relationship of sand-mud or sand-igneous rock, and the reservoir with abnormally high wave impedance has better hydrocarbon shows. Based on the analysis of the controlling factors of mid-shallow hydrocarbon accumulation in Nanpu oilfield, it was pointed out that No. 4 structural belt, eastern of No. 2 structural belt and No. 3 structural belt were the favorable exploration areas in future.