Jiyuan Oilfield Chang 4+5 Oil Reservoirs Geological Conditions And Forecast

In this paper,a more in-depth characterization of the study area Sedimentary characteristics and microfacies plane distribution,reservoir characteristics analysis of research priorities,through the development of a variety of plan members clearly Chang 4 + 5 reservoir in the characteristics and main controlling factor,Looking for high-yield relative permeability reservoir development area.After a small layer of fine division and stratigraphic correlation,micro sedimentary facies and sand body distribution characteristics of reservoir characteristics and evaluation of research,reservoir characteristics and main factor analysis,production and other steps to build a preferred target.Construction and development through micro-amplitude contrast proven oil development blocks and test cases,clearly Chang 4 + 5 reservoir distribution of the small layer structure from high-point control,obviously controlled favorable sedimentary facies,with lithologic Tibetan characteristics.Based on core observation and description,lithology,paleontology,sedimentary structure characteristic analysis,the mayor 4 + 5 reservoir major group subfacies delta front,delta plain obvious features,skeleton sand underwater delta distributary channel sand bodies.Small layer sand body width is generally less than 3Km,in some areas less than 1.5Km,Chang 4+5₂²southeast of Chang4 + 5 river sediment thickness,underwater distributary channel contiguous development,concentrated in thickness between 5.4 15.9m.Reservoir rock types are mainly fine grained lithic feldspathic sandstone,followed by feldspathic sandstone and feldspathic lithic sandstone.Diagenetic facies types include strong compaction hydromica / kaolinite cementation diagenetic facies,carbonate cementation diagenetic facies,chlorite film-residual intergranular pore diagenetic facies and kaolinite cementation-feldspar dissolution diagenetic equal four types Chang 4 + 5 reservoir in the gap of a maximum of 20.09%,the minimum is 0.72%,with an average of 10.79%.Mainly distributed porosity range between 7%-13%,accounting for 66.32 percent the number of samples,a peak of 11%-13%,accounting for 30.17 percent the number of samples.Maximum permeability of 6.69 × 10^-3?m²,the minimum is 0.03 × 10^-3?m²,with an average of 0.51 × 10^-3?m².The Jiyuan Oilfield Chang 4 + 5 reservoir sandstones are divided into five types,and reservoir comprehensive evaluation of the resource potential of the regions,preferably a three class ? favorable area,2 ? favorable areas,and 13 class ? favorable area.