南堡凹陷1号构造断层垂向封闭能力定量评价Quantitative-地球科学.PDF

Doi ：10.3799/dqkx.2017.574 南堡凹陷 1 号构造断层垂向封闭能力定量评价 胡欣蕾，吕延防，付广，王超，刘哲 东北石油大学地球科学学院，黑龙江大庆，163318 摘要：通过对断裂带内部结构及其特征研究发现，断层岩是断层构成的重要部分，断层垂向 封闭能力的强弱关键取决于油气运移方向断层岩与下伏储层岩石的排替压力差。若断层岩排 替压力大于储层岩石，断层垂向封闭，其封闭能力的大小取决于二者排替压力差值的大小， 差值越大，断层垂向封闭能力越强；反之断层垂向开启。断层岩的排替压力大小受泥质含量、 压实成岩程度、岩石结构方向性等因素的影响，其泥质含量越高、压实成岩程度越大、断面 方向与铅直方向夹角越小，断层岩排替压力越大。基于断层垂向封闭机理及影响因素，综合 实验室不同角度泥岩样品排替压力测试结果与岩石力学分解关系，在确定与目标点断层岩具 有相同压实成岩程度围岩地层的基础上，建立了一套定量评价断层垂向封闭能力的方法，并 将其应用于渤海湾盆地南堡凹陷 1 号构造内典型断层垂向封闭能力评价中，结果表明：f1 断层在不同测线处的断-储排替压力差为-0.114~1.035MPa，除 L7~L11 测线处其它测线内断 层岩排替压力均大于储层岩石，断层垂向封闭，与油气分布吻合关系较好。通过与未考虑岩 石结构方向性方法的比较，证实该方法具有更好的可行性和更高的可信度。 关键词：南堡凹陷；垂向封闭能力；断层岩；排替压力；压实成岩时间；岩石结构方向性 Quantitative Evaluation of Fault Vertical Sealing Ability of 1st Structure in Nanpu Sag Hu Xinlei, Lv Yanfang, Fu Guang, Wang Chao, Liu Zhe College of Earth Sciences, Northeast Petroleum University, Daqing, Heilongjiang, 163318 Abstract ：By the study of the internal structure and its characteristics of fault zone, it can be found that fault rock constitutes an important part of fault and its distribution in fault is universal, the vertical sealing ability of fault is mainly determined by the difference of capillary entry pressure between fault rock and underlying reservoir rock. Fault sealed when the capillary entry pressure of fault rock greater than that of reservoir rock, the sealing ability determined by the degree of capillary entry pressure difference, the greater the difference, the stronger the sealing ability of fault, and vice versa. The capillary entry pressure of fault rock depends on mud content, diagenetic degree and structure directionality of rock, the higher the mud content, the larger the degree of diagenesis, the smaller the angle between fault surface and vertical direction, which result in the greater the capillary entry pressure. Based on