Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (6): 1687-1694.doi: 10.13278/j.cnki.jjuese.201706108

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A New Predicting Method for Comprehensive Damage Degree of Mudstone Caprock by Fault and Its Application

Zhan Mingwang1, Fu Guang1, Qiu Cuiying2, Yang Zaizeng3   

  1. 1. College of Geosciences, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    2. Second Oil Production Plant, Daqing Oil Field Co, Daqing 163511, Heilongjiang, China;
    3. Fourth Oil Production Plant, Daqing Oil Field Co, Daqing 163511, Heilongjiang, China
  • Received:2017-04-17 Online:2017-11-26 Published:2017-11-26
  • Supported by:
    Supported by Major Projects of National Science and Technology of China(2016ZX05007-003)

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Abstract: In order to study the damage degree of fractures to caprock and its influence on oil and gas distribution in a fault developed zone in a petroliferous basin, based on the previous studies, we defined the comprehensive sealing ability of fractures and the comprehensive sealing capacity of mudstone caprock, and calculated the ratio of these two, and finally obtained the method for calculating the comprehensive damage degree of fractured mudstone caprock. This method was applied to calculate the comprehensive damage degree of K1d1 mudstone caprock in Huhenuoren structure in Bessie slope of Baer sag Hailar basin. The results show that the comprehensive damage degree of the F5 fault to K1d1 mudstone caprock is in the level of strong-stronger at the measuring site of No. 4, 6, 9, 10 and 11, but in weak level at the other measuring sites. In the site of No.4, 6, 9, 10 and 11 of the caprock with strong damage degree, no or little gas and oil appear in drilling well. The preservation of oil and gas is poor for the reason of strong caprock damage caused by fractures. In the measuring site of No.1-3, 5, 7,8 and 12-15 of the caprock with weak damage degree, the preservation of oil and gas is relatively better, and the near oil-bearing properties of well are industrial oil well or low production well. The comprehensive damage degree of F5 fault to K1d1 mudstone caprock is consistent with the K1n2 oil and gas show. It is proved that the method is feasible for study on the comprehensive damage extent of mudstone caprock by fault.

Key words: fault, mudstone caprock, comprehensive damage extent, Huhenouren structural zone, K1d1 Formation

CLC Number: 

  • P618.13
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