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孤岛油田西南缘断层封闭性研究对于确定馆下段油气藏的分布有着极为重要的意义。通过分析断层两盘岩性配置关系、泥岩涂抹、断裂带内充填物泥质含量等影响封闭性的因素,对该区主要断层的封闭性进行了研究。结果表明,断层封闭性是研究区馆下段油气藏成藏的主控因素。馆上段和馆下段7和8砂层组断层封闭性较好,有利于形成油气藏;馆下段8砂层组以下断层封闭性较差,可作为油气运移的通道。明确了研究区馆下段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馆下段油气藏勘探的重要目标。利用研究成果部署的孤南斜209井在馆下段成功钻遇油层25.2m/6层,展示了孤岛油田西南缘馆下段油气藏较好的勘探开发前景。
The study of fault sealing in the southwestern margin of Gudao Oilfield is very important for determining the distribution of reservoirs in the lower part of Gudao Oilfield. By analyzing the relationship between the lithologic configuration of the two faults in the fault, the application of mudstone and the muddy content of the fill in the fault zone, the sealing property of the main faults in this area is studied. The results show that fault sealing is the main controlling factor for the reservoir formation in the lower part of the reservoir. The upper seams and the lower seams 7 and 8 are well sealed, which is favorable for the formation of oil and gas reservoirs. The faults beneath the lower sandstone of the lower section of 8 are less well closed and can be used as channels for hydrocarbon migration. It is clear that the fractured reservoir-forming model of Bonan oil source fault-type fault-blockage in the lower section of the study area, fault block reservoirs and inverted traction micro-anticline structural reservoirs associated with faults are important for exploration of oil and gas reservoirs in the lower part of the reservoir aims. Using the results of the study, the simple Nanyan 209 well drilled the 25.2m / 6-layer reservoir in the lower section of the museum, demonstrating the prospect of exploration and development in the lower reservoir of the Southwestern Margin of Gudao Oilfield.