The Study On The Characteristics And Main Control Factors Of The Chang6 Reservoir In The South Area Of Haojiaping Of Xingzichuan,Ordos Basin

In this paper,on the basis of modern petroleum geology,reservoir geology,petrology,sedimentology,logging,geochemistry and statistical theory,use test instruments such as casting sheet and mercury injection,as well as chemical test analysis and other means,based on regional geological background,take the field geology survey as a supplementary mean,synthesize the above knowledge to analyze rock profile,and stratigraphic division and correlation of the objective layer,development and distribution characteristics of sedimentary facies,reservoir petrology characteristics,microscopic characteristics and reservoir types are studied,finally based on the above research results of Chang6 reservoir,comprehensively evaluate the Chang6 reservoir and analyze the reservoir control factors.The main research results are as follows:The sedimentary facies of the study area is the sedimentary facies of subaqueous distributary channel in the delta front,and the lithology is mainly composed of light gray,gray and gray green fine grained argillaceous sandstone.The reservoir type is the underwater distributary channel sandstone and channel sandstone,and the intergranular pore is the main storage space,which is a typical small hole-middle and thin throat and small pore-fine throat and micro throat.The average porosity of the study area was 9.1%,and the mean permeability was 0.55×10^-3?m²,which belongs to the low porosity and ultra-low permeability reservoir that the researchers often describe.The reservoir in the study area belongs to stress sensitivity and has strong heterogeneity.The cementation,dissolution,compaction and metasomatism in the formation of Chang6 reservoirs have obvious influence on the reservoir property,which is the main diagenesis.The Chang6 reservoir is the lithologic reservoir,whose distribution is mainly controlled by the source rocks and sedimentary micro facies.The research area has favorable hydrocarbon source rock conditions and cover conditions,well developed underwater distributary channel sand body,which is the main reservoir space of oil and gas in the region.The reservoir in the area are mainly composed of type?a and?b,which is corresponding to low-ultra-low permeability reservoir.