Differences of vertical hydrocarbon enrichment controlled by different types of faults: a case study of Qi'nan slope of Qikou depression,Bohai Bay Basin
Chu Rong1,2, Liu Haitao2, Wang Haixue1, Jiang Wenya3, Fu Xiaofei1, Wang Qi1, Liu Shirui1
1. School of Earth Sciences, Northeast Petroleum University, Heilongjiang Daqing 163318, China;
2. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
3. Research Institute of Exploration and Development, PetroChina Dagang Oilfield Company, Tianjin 300280, China
Bohai Bay Basin had undergone multi-period tectonic events, and fault traps were widely developed in this area. As the boundary condition of fault trap, faults played a vital role in hydrocarbon accumulation. Taking the Qi'nan slope with developed fault traps as an example, this paper analyzed the difference between the synthetic fault and antithetic fault in controlling the vertical oil and gas enrichment. Based on the 3D seismic data, the fault growth process and fault trap distribution, the formation and distribution of the fault-screened traps were also analyzed. Combined with the oil and water distribution, reservoir interpretation as well as quantitative grain fluorescence analysis, the differences in the reservoir controlling and formation mechanisms of different types of faults were clarified. The results showed that:(1) the fault segmented growth and differential activities between the hanging wall and footwall could be the main reasons for the formation of fault-screened traps under the control of synthetic fault, while the fault traps formed by the antithetic fault in the slope area could be the result of fault block tilting and warping; (2) synthetic fault traps could be developed at the segmented growth point of the hanging wall only when the synthetic fault activity was in the "hard-linkage" stage, while the antithetic fault trap could be developed at the footwall when antithetic fault activity was in the early stage; (3) synthetic faults could control the hydrocarbon accumulation in one or multiple petroleum systems, while antithetic faults could often control the hydrocarbon enrichment in one petroleum system; (4) the difference of vertical hydrocarbon accumulation controlled by different types of faults could be related to the position of trap development and the fault-caprock configuration. Shale smear factor was used to quantitatively evaluate the vertical hydrocarbon adjustment in the petroleum system controlled by the middle caprock of Member 1 of Shahejie Formation. The oil and gas was preserved when the shale smear factor was less than 3.5 but vertically leaked when the shale smear factor was higher than 3.5.
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Chu Rong, Liu Haitao, Wang Haixue, Jiang Wenya, Fu Xiaofei, Wang Qi, Liu Shirui. Differences of vertical hydrocarbon enrichment controlled by different types of faults: a case study of Qi'nan slope of Qikou depression,Bohai Bay Basin[J]. Acta Petrolei Sinica, 2019, 40(8): 928-940.
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2019, Vol. 40 
