Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (3): 685-693.doi: 10.13278/j.cnki.jjuese.201703104

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A Method Study of Destruction Degree of Faults to Caprock Comprehensive Sealing Gas Ability and Its Application

Wang Wei, Fu Guang, Hu Xinlei   

  1. College of Geosciences, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
  • Received:2016-09-28 Online:2017-05-26 Published:2017-05-26
  • Supported by:
    Supported by National Nature Science Foundation of China (41372153) and Northeast Petroleum University Innovation Foundation for Postgraduate (YJSCX2015-003NEPU)

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Abstract: To study the role of fault in oil-gas accumulation and distribution,based on the study of the caprock comprehensive sealing gas ability and its study method,characterizing caprock comprehensive sealing ability by utilizing pressure gradient of gas under residual pressure dissipating outwards through caprock, by comparing the difference of the caprock comprehensive sealing gas ability before and after caprock destroy and that after caprock destroyed by faults,we set a quantitative study method of destruction degree of faults to caprock comprehensive sealing gas ability,and made an example of Ed2 mudstone caprock in No.5 structure zone from Nanpu sag of Bohai bay basin,finally carried out a quantitative study of destruction degree of NP5-2 Fault to Ed2 mudstone caprock comprehensive sealing gas ability. the result indicated that, the regional destruction degree was preferably high,except for week destruction degree in L6 survey line, and intermediate weak destruction degree in L1, L5, L8 survey lines. The destruction degree was preferably strong in the west than the east,and it coincided well with the distribution of present found gas below Ed2 mudstone caprock gas reservoir in the east part of fault. This method is feasible to quantitatively study the destruction degree of faults to caprock comprehensive sealing gas ability.

Key words: fault, caprock, comprehensive sealing gas ability, destruction degree

CLC Number: 

  • P618.13
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