西湖凹陷平湖油气田断层封闭性评价  

Study on fault-sealing in Pinghu oil and gas field, Xihu depression

作　　者：张娟[1] 

机构地区：[1]中国石化股份胜利油田分公司地质科学研究院,山东东营257015

出　　处：《油气地质与采收率》2012年第4期18-20,112,共3页Petroleum Geology and Recovery Efficiency

摘　　要：断层封闭性对西湖凹陷平湖油气田的油气分布具有重要的控制作用,对其开展系统的研究和评价是目前勘探实践的需要。利用断层泥比率、泥岩涂抹潜力及构造应力场分析等方法对平湖油气田5条主要断层进行了封闭性综合评价。结果表明: 当断层泥比率大于60%且泥岩涂抹潜力大于4时,基本达到断层侧向封闭条件。断层封闭性与构造应力相关,拉张应力期,断层开启; 挤压应力期,断层封闭。平湖油气田0号断层在平湖组P4—P12砂层组沉积时期封闭性好,在平湖组P1—P3砂层组沉积时期封闭性差;在花港组沉积时期断层封闭性中等。1号断层在平湖组沉积时期封闭性较好,在花港组沉积时期封闭性差。2号断层在平湖组沉积时期封闭性较好,在花港组沉积时期封闭性好。4号断层和11号断层在平湖组、花港组沉积时期封闭性均差。Exploration practice showed that fault-sealing controlled the hydrocarbon distribution in Pinghu oil and gas field of Xihu depression, while the corresponding research had not been carried out. According to the sand-mud docking relationship on both sides of faults and smear gouge ratio calculation, fault-sealing evaluation of the main five faults in research area were studied , and the fault-sealing history in the key hydrocarbon migration period was reconstructed by the technology of layer flatten. The research results showed that fault-sealing in Pinghu Formation was better, and in Huagang Formation was weaker, when smear gouge ratio was more than 68 percent, fault side blocking were formed. Fault-sealing ability was changed by the various tectonic evolutionary stages and had relationship with tectonic stress field; in the faulted stage, the research area was mainly in tensile stress, and the faults was open; in the depression stage, some regions was mainly in compression-torsion stress, and the faults in the area was seal such as number 1 fault and in the north of number zero fault, fault-sealing in the other regions was weak.

关 键 词：断层泥比率 泥岩涂抹潜力 构造应力场 断层封闭性 平湖油气田 

分 类 号：TE112.321[石油与天然气工程—油气勘探]