LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (6): 64-71.doi: 10.3969/j.issn.1673-8926.2015.06.009

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Hydrocarbon accumulation and enrichment rule of Ordovician in Yingmai - 2 area, northern uplift of Tarim Basin

Chen Siming 1,Hou Mingcai 1,Fang Qifei2,Fan Shan 3,Yao Qingzhou 2,Zhou Junfeng 2   

  1.  1. Institute of Sedimentary Geology ， Chengdu University of Technology ， Chengdu 610059 ， China ； 2. PetroChina Research Institute of Petroleum Exploration & Development-Northwest ， Lanzhou 730020 ， China ； 3. Research Institute of Exploration and Development ， PetroChina Tarim Oilfield Company ， Korla 841000 ， Xinjiang ， China
  • Online:2015-12-20 Published:2015-12-20

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Abstract:

In order to confirm the oil and gas accumulation rules of Ordovician carbonate reservoir in Yingmai-2 area, through the analysis of petrography and temperature features of fluid inclusion, the time-space relation for reservoirforming conditions was studied from the aspects of accumulation stages, structure, fault and reservoir. The result shows that the Ordovician reservoir in Yingmai-2 area experienced three hydrocarbon inclusions stages, including the late Caledonian-early Hercynian, the late Hercynian and the Himalayan stage. These three stages represent the oil and gas charging of three different periods and intensities, and the main stage is the intermediate oil and gas charging in late Hercynian. Under the background of structure, the oil and gas accumulation of Yingmai-2 area were controlled by space-time matching of fracture and reservoir during the main reservoir-forming period. Reservoir development and oil and gas enrichment were dominated by superimposition of fractures in three different stages. NNW and NW strike-slip fault and NE thrust-strike-slip fault played an important role in hydrocarbon migration and adjustment. The faults of three different periods met to form the fault interference zone, which can control the development and enrichment of oil and gas reservoir. On this basis, the replacing area of oil and gas enrichment of Yingmai-2 area was predicted.

Key words:  low salinity water flooding , carbonate reservoir , enhanced oil recovery , wettability alteration , pore connectivity

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