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Reservoir characteristics and exploration method of metamorphic rock in Budate Group in Beier Rift of Hailaer Basin

WANG Yu-hua1,2,ZHANG Ji-guang2,ZHANG Hai-jun3 (1.Guangzhou Geochemistry Institute of Chinese Academy of Sciences,Guangzhou 510640,China;2.Exploration Company of Daqing Oilfield Company Ltd.,Daqing 163453,China;3.Exploration and Daelopment Reseerch Znstitute of Daqing Dilfield Company Ltd.,Daqing 163712,China)  
Beier Rift of Halaer Basin has an area of 3010 km2, including 4 sets of oil-bearing combination from lower to upper part.Among them,metamorphic rock of Budate Group has characteristics of large thickness of reservoirs and high productivity(several wells have daily production more than 30 t).This area consists of cataclastic andesitic tuff,altered volcanic rock,slightly altered and cataclastic anisomerous sandstone,slump breccia,and silt bearing cataclastic tuffaceous shale.Formation dip is large,caverns develop much,fractures crisscross each other,part with metasomatism of kiesel and carbonate.Reservoir space is mainly secondary fractures and all types of corroded pores,and secondarily matrix pores.This area is vertically divided into detrition development zone,fractures,corroded pores and caverns development zone and tight zone.This kind of special reservoir needs concrete exploration techniques.Practice shows that pre-stack time migration processing and 3D seismic interpretation are basis for identifying top form variation of metamorphic rock.Performing inversion processing and interpretation aiming at fracture prediction is one of important evidence for well!arrangement.Obtaining correct core data and imaging logging data is key point of identifying fractures,corroded pores and caverns in metamorphic rock reservoirs.Reasonable fracturing technique is mainly method for getting high oil production.
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