吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (3): 705-718.doi: 10.13278/j.cnki.jjuese.20170006
胡欣蕾, 吕延防, 孙永河, 孙同文
Hu Xinlei, Lü Yanfang, Sun Yonghe, Sun Tongwen
摘要: 为了更加准确地评价盖层内断层垂向封闭能力,在利用实验验证岩石各向异性对排替压力影响的基础上,结合断层岩与储层岩石的力学分解关系,综合考虑不同类型岩石压实成岩时间对排替压力的影响,对断层垂向封闭的断-储排替压力差法进行改进,并以此来定量评价渤海湾盆地南堡凹陷5号构造Fnp5-3和Fnp5-5两条主要断层的垂向封闭能力。研究结果表明:存在一个断-储排替压力差封油气下限值,只有当断层岩排替压力大于储层岩石排替压力且二者差值大于等于封油气下限值时,断层垂向封闭。由此确定反向断层Fnp5-3的封油气下限值为0.221 MPa,顺向断层Fnp5-5的封油气下限值为0.311 MPa;受油气富集部位及断裂带内部结构发育特征的影响,反向断层较顺向断层更易形成封闭,此评价结果与油气分布规律吻合关系较好。而利用改进前方法得到的评价结果(断层垂向不封闭)与实际钻井含油气性相矛盾,表明改进后方法在综合定量评价断层垂向封闭能力时的合理性与可行性。
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