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油源分析表明,孤岛油田西南缘Ng下油藏原油主要来自渤南洼陷Es3烃源岩,油气藏类型以构造油气藏为主。断层封闭性是研究区Ng下油藏成藏的主控因素,对研究区主要断层封闭性研究结果表明:Ng7下、Ng8下断层封闭性较好,利于形成油气藏;Ng8下以下断层封闭性较差,可作为油气运移的通道。研究区Ng下油气成藏模式可概括为渤南油源型断阶输导-断层封堵成藏模式,断块油气藏和与断层伴生的逆牵引微背斜构造油气藏是该区Ng下油气藏勘探的重要方向,该成藏模式应用效果良好,展示了孤岛油田西南缘地区Ng下油气藏较好的勘探开发前景。
The analysis of oil source shows that the crude oil of Ng under the southwestern margin of Gudao Oilfield comes mainly from Es3 source rock in Bonan Sag, and the types of reservoirs are mainly composed of structural reservoirs. Fault sealing is the main controlling factor for the formation of reservoirs under Ng in the study area. The study on the main fault sealing in the study area shows that the fault sealing under Ng8 is better under Ng7, which is favorable for the formation of reservoirs. The fault sealing below Ng8 Poor, can be used as a channel for oil and gas migration. The hydrocarbon accumulation pattern under Ng in the study area can be summarized as follows: fault-block fault-trap accumulation model of Bonan oil source type, fault block reservoirs and inverted traction micro-anticline structural reservoirs associated with faults are under Ng The important direction of oil and gas exploration is that the reservoir model has good application effect and shows the prospect of exploration and development of Ng reservoirs in the southwestern margin of Gudao Oilfield.