The Reservoir Quality Evaluation Of Alluvial Mid-fan In Wangguantun Oil Field Guan 997 Fault Block

After more than 30 years' water injecting,reservoir in Wangguantun Oil Field Guan 997 fault block have been entered the middle-last stage of development.With the increasing of water content,reservoir heterogeneity become stronger,reservoir quality decline and the extraction efficiency of come down.Meanwhile,as the injection-production well spacing gets relatively perfect and geological data enriches,the fault structure and sedimentary environment needs to be systematicly restudied.Considering the problems above,using core analysis test data,log data,tracer monitoring data and production performance data,this article systematicly to establish a single sand level isochronous stratigraphic framework which can be used in the whole study area to reconsider the fault structure of Wangguantun Oil Field Guan 997 block fault and determine the oil group of sedimentary microfacies distribution in Zao ? and Zao ? oil set to Illustrate the research area within the group oil reservoir layer upon layer,interlayer and plane heterogeneity,and to reveal the distribution of sand body control factors and to build a Individual Sandstone Body 3D model of study area.This paper overall analyzes the impact of fault structure,sedimentary environment,heterogeneity and other factors on the quality of Zao ? and Zao ? oil set,evaluates the reservoir quality of Zao ? and Zao ? oil set in the study area,and finally descrtipts the quantitative of remaining oil distribution,making practical exploration plan service,achieve the goal of improving reservoir development effects.It is considered that Guan 997 fault block mainly develops braided river deposit in alluvial fan mid-fan,and the reservoir lithology is mainly fine sandstone,and is characterized by low composition maturity and medium structure maturity.The pore structure type is mostly medium to low pore fine throat type,average porosity is 13.95% and average permeability is 81.35 mD.Pore medium permeability reservoir.On this basis,the reservoir quality control factors are analyzed from the angle of structure and deposition,and the rational allocation of reservoir sand body and fault is beneficial to the accumulation of oil and gas,and the sedimentary conditions control the original physical property of the reservoir,and the diagenesis is the key factor for the later transformation of the reservoir.According to the above reservoir quality factors,3 parameters of sedimentary sand porosity,permeability,mud content are selected.The quality of Zao ? and Zao ? oil reservoir in Guan 997 fault block is evaluated,and the difference distribution characteristics of reservoir quality are revealed.The results show that the braided river controls the macroscopic distribution of the reservoir,and the reservoir with the best quality is Guan 997 fault block in the heart beach and braided channel.