Reservoir Comprehensive Evaluation And Productive Advantageous Regions Prediction On Chang2 Reservoir Of Geng179 Block Of Jiyuan Area

The study area locates in Ding bian County,west-central of Yishan slope Erdos basin.The target stratum is Chang 2 oil reservoirs group.Based on logging,drilling,well-logging,oil testing data,data of experimental analysis and so on,using modern geological theory and various processing software,the author carries out the study of sedimentary stratigraphic correlation,the distribution of sedimentary facies and sandstone and comprehensive geological research of Chang 2 reservoir.Identifies the regularity of the spacical development and distribution of Chang2 sandstone reservoir,carries out the comprehensive classification evaluation,finds out controlled factors of the distribution and enrichment of the Chang 2 oil reservoirs,forecasts the favorable oil accumulation zone.The strata in the study area is relatively flat.The dip direction of the formation is west by south.The structure is consistent with the regional monoclinic background.Nose-uplifting structures are developed.Chang 2 is Delta front parfacies deposition.The lithology mains with feldspathic sandstone and small amounts of lithic arkose.Chang2 reservoir is characterized by characterized chmesoporosity and low permeability.Diagenesis is strong and the diagenetic evolution stage reached into “A” stage of late diagenesis period.Pore types maining with intergranular dissolved pore contain intergranular pore,intergranular dissolved pore,intragranular dissolved pore,moldic pore,intercrystalline pore,micro fracture and soon.Clastic particles are sub angular,sorting,particle support,line contact or point-line contact,the type of cementation for film-pore type or increase-pore type.The reservoir has strong anisotropism.Reservoir thickness,porosity and permeability is controlled by sedimentary facies belt,has a certain direction.The common percolation area of oil-water two phases is narrow and the bound water saturation is higher.The reservoir is hydrophilic.According to comprehensive classification evaluation standard of Chang 2reservoir,there are a total of four types including A,B,C,D in Chang 2 reservoir,corresponding to good reservoir,medium reservoir,mainly poor reservoir,poor reservoir and mainning with ?,?.