Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (3): 705-718.doi: 10.13278/j.cnki.jjuese.20170006

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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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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

CLC Number: 

  • P618.13
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