古龙油田葡萄花油层断层封闭性分析

摘要

古龙油田断层极为发育,断层的封闭性对研究区油气的运聚起着重要的控制作用,研究断层封闭性有利于预测油气成藏的有利部位.从断层类型、几何特征和埋深对研究区断层封闭性开展地质定性分析,重点从断层两盘岩性对置、泥岩涂抹和应力对断层封闭性进行了定量分析,研究典型断层的封闭演化史.结果表明,古龙油田葡萄花油层一级断层和三级断层封闭性较好,二级断层封闭性一般;平面上鼻状构造断层封闭性好于向斜断层封闭性,其中龙南鼻状构造断层封闭性最好.%Faults in the Gulong oilfield are extremely developed.The fault sealing ability plays an important role in controlling the oil and gas migration and accumulation in the study area, so the study of fault sealing is in favor of the prediction of favorable locations for oil and gas accumulation.Qualitative analysis were carried out on the fault sealing ability in the study area from the aspects of fault type, geometric characteristics and buried depth, focusing on the two sides lithology configuration, clay smearing and stress.The sealing evolution history of typical faults was also studied.The results show that the primary and tertiary faults have good sealing ability, while the sealing ability of the secondary faults is ordinary.The fault sealing ability of the nose structure is superior to that of the syncline fault, in which the fault sealing ability of Longnan nose structure is the best.