THE DISTRIBUTION CHARACTER AND OVERLAPPING RELATIONSHIP BETWEEN URANIUM AND HEAVY CRUDE OIL IN CHEPAIZI UPLIFT OF THE JUNGGAR BASIN
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摘要: 车排子凸起位于准噶尔盆地西缘,为一海西期继承性发育的古隆起,现今总体呈向东南倾斜的斜坡。石炭系火山岩之上超覆沉积了侏罗系、下白垩统吐谷鲁群、新近系沙湾组、塔西河组、独山子组和第四系。通过对该区石油钻井测井、录井及试油资料分析发现,在白垩系和新近系发育多层含铀砂岩,且主要分布在沙湾组和塔西河组砂岩、砂砾岩及吐谷鲁群砂岩中,具有高异常GR(自然伽马)和GRSL(总伽马)值、低KTH(无铀伽马)值特征,为铀矿化异常所致;而稠油则分布在侏罗系、吐谷鲁群和沙湾组储层中。两者具有良好的叠置关系,与地下水化学特征关系密切。横向上主要沿P1—P103—P602—P7—P2等井呈北东—南西向展布,纵向上铀砂主要发育在稠油段上方。Abstract: Chepaizi Uplift,a successive Hercynian paleo-uplift,is located in the western margin of the Junggar Basin,and it is a slope leaning to southeast.Quaternary,Dushanzi Formation,Taxihe Formation and Shawan Formation of Neogene,Anjihaihe Formation of Paleocene,Tugulu Group of Lower Cretaceous and Jurassic sedimentary overlap the Carboniferous volcanic rock.Through the analysis of the well drill data,log data and well test,a couple layers of uranium bearing sandstone are found,with the feature of high GR value,high GRSL value and low KTH value which are caused by high uranium content and mainly distribute in the sandstone and conglomerate in Shawan Formation and Taxihe formation,also in the sandstone in Tugulu Group,while heavy crude oil distributes in Jurassic,Tugulu Group and Shawan Formation.Uranium bearing sandstone mainly overlays the heavy crude oil reservoir,which is intently related to the groundwater character,and they distribute horizontally along Wells P1-P103-P602-P7-P2.
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