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超压泥岩盖层内断裂能否形成垂向封闭,关键取决于其断裂带内泥岩盖层岩石排替压力的大小,排替压力越大,封闭能力越强;反之则越弱。根据不被破坏泥岩盖层与断层带内泥岩盖层岩石排替压力之间的关系,利用超压使断裂带内泥岩盖层排替压力的改变系数,建立了一套超压泥岩盖层内断裂垂向封闭能力的评价方法,并将其应用于海拉尔盆地乌尔逊凹陷苏仁诺尔断裂在大一段超压泥岩盖层内断裂垂向封闭性评价中,结果得到其均具有较好的封闭能力,较大一段泥岩盖层封闭能力还强,与目前该凹陷南二段油气分布十分吻合,表明该方法用于超压泥岩盖层内断裂垂向封闭性评价是可行的。
Whether the fractures in the overpressured mudstone cover can form a vertical seal depends critically on the displacement pressure of the mudstone caprock in the fault zone. The larger the displacement pressure is, the stronger the sealing capability is, and vice versa. Based on the relationship between the failure pressure of the caprock and the caprock pressure in the fault zone, a set of overpressured mudstone caprock caprock The evaluation method of the vertical sealing capacity of faults is applied to evaluate the vertical sealing of faults in the Upper Jurassic Fault in the Wuerxun Depression in the Hailaer Basin. Therefore, the sealing ability of the larger mudstone cap is also strong, which is in good agreement with the current distribution of oil and gas in the second member of this depression, indicating that this method is feasible to evaluate the vertical sealing property of fractures in overpressured mudstone caprock.