Oil & Gas Geology ›› 2013, Vol. 34 ›› Issue (6): 790-796.doi: 10.11743/ogg20130611

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Quantitative evaluation of control of faults on hydrocarbon accumulation and play fairway prediction:a case from Es3(1) in Qijia-Yuanyanggou area, the Liaohe Depression

Sun Tongwen1, Lv Yanfan1, Liu Zhe1, Fu Guang1, Sun Yonghe1, Zhang Dongwei2   

  1. 1. College of Geosciences, Northeast Petroleum University, Daqing, Heilongjiang 163318, China;
    2. Research Institute of Petroleum Exploration & Development, Liaohe Oilfield Company of CNPC, Panjin, Liaoning 124000, China
  • Received:2012-09-18 Revised:2013-10-11 Online:2013-12-08 Published:2014-01-04

Abstract: In order to understand the control of faults on hydrocarbon accumulation in the Paleogene Shahejie Fm(Es3(1))in Qijia-Yuanyanggou area,the Liaohe Depression,source rock-rooted faults were identified on the basis of fault system division.In addition,the SGR method and fault growth rate were applied respectively to quantitatively evaluate the lateral sealing capacity of fault traps and the fault activity intensity after hydrocarbon accumulation period.The results show that the control of faults on hydrocarbon accumulation is depicted mainly in the following three aspects.Firstly,the oil source-rooted faults control the locations of hydrocarbon accumulation;secondly,the lateral sealing capacity of faults controls fullness of the fault traps;and thirdly,the fault activity intensity after hydrocarbon accumulation period controls the preservation of pre-existing oil and gas.Based on the above studies,criteria for selection of favorable targets were established.When oil sources are sufficient and reservoir physical properties are good,class-Ⅰ trap is defined as fault traps under the control of two or more source rock-rooted faults,having a hydrocarbon fullness greater than 50% and fault activity intensity(after hydrocarbon accumulation period)less than 2m/Ma.Drilling risk of class-Ⅰ is minimum,followed by class-Ⅱ and class-Ⅲ traps.Finally,two class-Ⅰ traps and one class-Ⅱ trap were mapped,and the oil-bearing area of Es3(1) in these traps is 5.8 km2

Key words: lateral sealing capacity, fault activity intensity, source rock-rooted fault, play fairway, Es3(1), Qijia-Yuanyanggou area, Liaohe Depression

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