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

• 地质与资源 • 上一篇    下一篇

泥岩盖层内断层垂向封闭能力综合定量评价:以南堡凹陷5号构造东二段泥岩盖层为例

胡欣蕾, 吕延防, 孙永河, 孙同文   

  1. 东北石油大学地球科学学院, 黑龙江 大庆 163318
  • 收稿日期:2017-09-16 出版日期:2018-05-26 发布日期:2018-05-26
  • 作者简介:胡欣蕾(1991-),女,博士研究生,主要从事油气藏形成与资源评价方面的研究,E-mail:dqsyhuxinlei@163.com
  • 基金资助:
    国家油气重大专项（2016ZX05007-003-03）；国家科技重大专项（2016ZX05006-005）；国家自然科学基金项目（41572127）；东北石油大学校级研究生创新科研项目（YJSCX2017-001NEPU）；中国石油天然气股份有限责任公司重大科技项目（2016D-0702）

Comprehensive Quantitative Evaluation of Vertical Sealing Ability of Faults in Caprock: An Example of Ed2 Mudstone Caprock in Nanpu Sag

Hu Xinlei, Lü Yanfang, Sun Yonghe, Sun Tongwen   

  1. College of Earth Sciences, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
  • Received:2017-09-16 Online:2018-05-26 Published:2018-05-26
  • Supported by:
    Supported by National Oil and Gas Major Project (2016ZX05007-003-03),National Science and Technology Major Project (2016ZX05006-005),National Natural Science Foundation of China (41572127),Ortheast Petroleum University Graduate Students' Innovative Project (YJSCX2017-001NEPU),PetroChina Company Limited Science and Technology Major Project (2016D-0702)

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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。

关键词: 垂向封闭, 排替压力, 压实成岩时间, 岩石各向异性, 泥岩, 南堡凹陷

Abstract: To accurately evaluate the vertical sealing ability of the faults in caprock, based on the experiment of verifying the influence of the rock anisotropy and the mechanical relation of the displacement pressure of the fault rock and the reservoir rock in different directions, we improved the pressure-difference method to evaluate the fault sealing ability,and further analyzed the vertical sealing ability of the main faults Fnp5-3 and Fnp5-5 in 5th structure of Nanpu sag in the Bohai Bay basin, in combination with the differences in diagenetic time of different rocks, as well as the influence of the rock anisotropy on displacement pressure. The results indicate that:there is a low limit of displacement pressure difference between the fault rock and the reservoir rock, and only if the displacement pressure of the fault rock is larger than that of the reservoir rock,and the difference between the above two is larger than or equal to the low limit, then the faults seal vertically. From this, it is determined that the low limit of the reverse fault Fnp5-3 is 0.221 MPa, and the low limit of the forward fault Fnp5-5 is 0.311 MPa. Influenced by the accumulation of oil-gas and the characteristics of the fault internal structure, reverse faults are more likely to seal than forward faults. This is coincided well with the pattern of oil-gas accumulation; while the evaluation results obtained by the previous method without considering the above factors are inconsistent with the actual drilling oil-gas results. The improved method is reasonable and feasible for a comprehensive evaluation of the fault vertical sealing ability.

Key words: vertical sealing ability, displacement pressure, diagenetic time, anisotropy of rock, mudstone, Nanpu sag

中图分类号: 

  • P618.13
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