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《Xinjiang Geology》 2006-01
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RESEARCH OF THE FRACTURE RESERVOIRS IN QINGXI OILFIELD

ZHOU Xiao-feng1,2,3,ZHAO Ying-cheng2,WANG Chong-xiao4,DU Wen-bo4(1.Lanzhou Research Center of Oil&Gas Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou,Gansu,730000,China;2.Northwest Institute,Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou,Gansu,730020,China;3.Graduate school of Chinese Academy of Sciences,Beijing,100039,China;4.Research Institute of Petroleum Exploration and Development,Yumen Oilfield Company,PetroChina,Yumen,Gansu,735200,China)  
Qingxi oilfield locates at Qingnan sag that lies in the west of Jiuxi basin.Liugouzhuang fault nose and Kulongshan anticline are the main structures in Qingxi oilfield.and whose reservoir is Xiagou group.Reservoirs of Qingxi oilfield mainly comprise of the argilliferous dolostone in the moderate deep lacustrine facies to deep lacustrine facies and the conglomerate in the fan-delta-front subfacies in lower Cretaceous.The present depth of Xiagou formation is more than 4000m,and it is at the later stage of diagenesis and is tightly compacted to reservoirs with very low permeability.As the argilliferous dolostone with laminated structures and large amount of feldspars and quartz can easily form fracture networks along and cutting through layers,contracting fracture networks caused by the changing between clay minerals,fracture networks caused during the generation of oil and gas,dissolved fracture and cave networks,and structural fracture networks,which act as the network for oil and gas migration and accumulation.According to the liquid-save-compartment theory and the oil and gas accumulation mechanism under abnormally high pressure,the oil and gas accumulation should be densely distributed at the structural transition belts,the outer flanks of arc faults,the intersection of faults and anticline structures where the structural stresses are focused and released.Xiagou formation in Qingxi oilfield wholly contains oil and gas,but the enrichment levels differ greatly within it.Fractures contribute a lot to the flow and accumulation of oil and gas.There are some difficulties in the recognition of sections with effective fractures,which are caused by the complex mineral constituents of the strata and the variety of fractures and their assemblages.Qingxi oilfield is chracterized by great differences in production and elastic recovery ratio between wells,high rate of production decreases,and different result of acid treating.
【Fund】: 中国石油勘探与生产公司勘探前期评价项目(KTQQ-2004-018)资助
【CateGory Index】: P618.13
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