The Research On Sedimentary Reservoir Of Mesozoic-Cenozoic In The Midwest Section Of Yakela Fault-Uplift In Tarim Basin

The research area is located in the Tarim Basin Kuche County,the tectonic of this area developed in middle west Yakela Fault Salient of Shaya uplift,its north neighbor is Kuche depression and the south one is Halahatang depression.The Cenozoic strata comparatively developed in this area,including Triassic-lower Cretaceous which is continuous deposition,lacking of upper cretaceous,affacting by basin structure transformation.The paleogene system deposition featured with the north thick and south thin,paleogene-quaternary system is continuous deposition.Cretaceous-paleogene mainly developed lake and delta sedimentary system.The lake is characteristic of oxidation wide and shallow.The delta sedimentary system consists of fan-delta and braided river delta.ShuShanHe group in Cretaceous mainly contains littoral and shallow lake,dam deposit.Baxigai group in Cretaceous constitutes with braided river delta and littoral and shallow lake deposits.Cretaceous Bashijiqike group is delta plain subfacies to delta front subfacies.Paleogene mainly developed braided river delta front subfacies,coastal and shallow lake facies.The lithology in Cretaceous reservoir is lithic arkose and feldspathic lithic sandstone.The structure in Cretaceous Baxigai group and cretaceous Shushanhe showed better maturity,which overall belongs to low porosity,low permeability reservoir.Stages in late the stage of cretaceous diagenetic evolution is late diagenetic A period.Reservoir sensitivity damage in Sandaoqiao Baxigai group featured with acid sensitivity,its alkali sensitivity and salt sensitivity is medium strong salt sensitivity,and its speed sensitivity and stress sensitivity is medium weak.Paleogene reservoir lithology is mainly lithic arkose,feldspathic lithic sandstone,low compositional maturity.Reservoir space is mainly primary intergranular pore,which overall belongs to low and middle hole,medium-high permeability reservoir.Rock rate statistics,modeling results and attribute clustering analysis results shows that the speed of mudstone and sandstone,cream rock and formation in Cenozoic strata in this research area is apparent speed difference.The root-mean-square amplitude attribute is relatively sensitive prediction for paleogene sandstone and Cretaceous Baxigaisand body which can better reflect the sand body of lateral change of lithology combination and distribution.