Oil & Gas Geology ›› 2016, Vol. 37 ›› Issue (6): 979-989.doi: 10.11743/ogg20160620

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An quantitative evaluation method of probability for diversion flow oil and gas laterally from faults to sand bodies: A case study from Leave Chu Structure in the Raoyang Sag,Bohai Bay Basin

Wang Wei1, Sun Tongwen1, Cao Lanzhu2, Lyu Yanfan1, Fu Guang1, Lu Xiuqin2, Deng Wei1, Zhang Huan1   

  1. 1. College of Geosciences, Northeast Petroleum University, Daqing, Heilongjiang 163318, China;
    2. Exploration and Development Research Institute of Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, China
  • Received:2016-09-27 Revised:2016-10-12 Online:2016-12-08 Published:2017-01-02

Abstract: In hydrocarbon exploration,it is very important to identify the dominant strata for oil and gas lateral charge after vertical migration,but there is few effective evaluation method.This paper took Leave Chu area of the Raoyang Sag in the Bohai Bay Basin as an example.On the basis of comprehensive analysis on factors influencing oil and gas lateral diversion probability,such as caprock thickness and contact area between faults and sand bodies,evaluation methods of influence factors were established by using reservoir seismic inversion.Correlation between percentage of trap-filling and various selected factors was systematically analyzed to build quantitative evaluation equation for fault-sand lateral diversion probability.The results show that when fault-sand lateral diversion factor R>0.3,oil and gas lateral diversion initiates.A positive correlation between the R and percentage of trap-filling is observed.Moreover,when R>0.9,reservoirs are fully charged net pay zone.The factor R is applied to the faults f038 and f008,and the results are in good agreement with drilling data.

Key words: fault-sand lateral diversion, quantitative evaluation, oil and gas migration, Leave Chu Structure, Raoyang Sag, Bohai Bay Basin

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