Reservoir Description Of The Chang4+5-Chang6of The Xinzhai Block In The Wuqi Area, Ordos Basin

As the lack of the comprehensive understanding of the reservoir characterics in WuQi area, thesis based on sedimentology, petroleum geology and structural geology theory, synthesize the geological, well logging data, using more technology, and combining the multidisciplinary research methods, with chang4+5and chang6reservoir as the research object, and structure, sedimentary environment as research emphasis,do the geological evaluation for reservoir description research, through the research, this paper get the following results:The studies suggested that major reservoir in this area is chang4+51, chang4+52, chang61-1, chang61"2and chang62reservoir, reservoir groups to delta front subfacies is mainly underwater distributary channel microfacies; The major reservoirs in the study area is chang4+51, chang4+52, chang61-1and chang61"2reservoir, the lithology is mainly fine-grained feldspar sand stone. From deposition, petrophysical property, rock components, filler content, pore types, pore structure, etc, comprehensive research think chang4+52and chang61"1has good reservoir conditions.Based on the sedimentary facies, reservoir petrology characteristic and the physical characteristics, researching the macroscopic distribution characteristics of the reservoir, finally has carried on the comprehensive evaluation of reservoir, chang4+5and chang6reservoir mainly development of low porosity, low permeability and ultra-low permeability reservoir, parts of the reservoir is dense layer; Underwater distributary channel and river mouth bar is the high quality oil and gas reservoir of the yanchang formation, the main reservoir types in the area is lithologic reservoir, Chang4+52, Chang61-1, and Chang61-2is the best oil and gas accumulation layer in this area.