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断层是惠民凹陷南部地区油气运移的主要通道,主要油源断层的输导与封闭性决定了该区油气富集程度。利用断裂活动期与油气运移期的匹配关系,研究了该区主要断裂输导与封闭性能的时间变化规律,活动期断层对油气起输导作用,静止期其输导与封闭性能受到很多地质因素影响。采用定量方法对该区夏口断层、营子街断层、玉皇庙南断层的封闭性进行单因素研究,并利用模糊评价方法,分别对其进行了综合评价。结果表明,该区断层静止期,沿断层走向,其输导与封闭性能具有一定的变化规律。沿夏口断层走向,夏23—夏37井区附近封闭性差,夏37井区附近封闭性中等,夏37—夏224井区西侧封闭性较差,夏224—夏223井区附近封闭性中等,夏口断层的最东段封闭性变差;营子街断层自西向东封闭性由差变好;玉皇庙南断层的封闭性整体较好,但是断层东、西段封闭性好,中段封闭性差。该区断层输导与封闭的主控因素有断层活动性及断距、断层走向与倾角、泥岩涂抹系数。
The fault is the main channel for hydrocarbon migration in the southern area of the Huimin Depression. The conductivity and sealing of major oil source faults determine the degree of oil and gas accumulation in this area. Based on the matching relationship between fault active period and hydrocarbon migration period, the time variation of the conductivity and sealing performance of the main faults in this area is studied. Active faults act as the conduits for oil and gas transport, and the transport and sealing properties of the faults in the quiescent period are affected by many geological Factors affect. Quantitative methods were used to study the sealing of the Xiaokou fault, Yingzijie fault and the Jade Emperor Miao South fault in this area by using the single factor method and the fuzzy evaluation method. The results show that there is a certain variation rule in the fault quiescence and fault strike along the fault. Along the strike of the summer mouth, the tightness is close to the area around Xia 23- Xia 37 in the middle, and the closure is nearer to the middle of Xia 37 well. The closure on the west side of Xia 37-Xia 224 zone is poor. Medium, the closure of the easternmost part of the Yakou fault becomes worse; the closure of the Yingzijie fault changes from west to east, and the closure of the Jade Emperor Miao south fault is better. However, the closure of the east and west sections of the fault is good, Sealing in the middle is poor. The main controlling factors of fault transmission and sealing in this area are fault mobility and fault distance, fault strike and dip angle and mudstone smearing coefficient.