Sedimentary Reservoir Study Of Permian Shang Wuerhe Formation In Well Block Jinlong-2 Of Junggar Basin

Well Block Jinlong-2 located in the northwest edge of Junggar Basin,Since 2010,Xinjiang Oilfield Company turn to Zhongguai-wuba slope region,By Jinlong-2 wells old wells review on Shang Wuerhe section test oil,access to industrial oil and gas flow.However,due to the stratigraphic framework region,sedimentary characteristics,reservoir characteristics,etc.is not understanding enough,so that the block of oil and gas reservoir distribution,size,proved developed reserves rational calculation and reservoirs is restricted.In this paper,through the comprehensive utilization of existing data in the study area,have a fine division and correlation on the stratum Shang Wuerhe Formation of Permian.Combined with cores,well logging and other information,launched a study of reservoir sedimentary facies and reservoir characteristics on Shang Wuerhe Formation of Permian,and reservoir evaluation and classification analysis of key factors.Studies have shown that :Shang Wuerhe Formation of Permian strata on the bottom-up can be divided into three sections,the overall size tapers showed a clear upward sedimentary hemicycle.Sedimentary Facies of fan delta front underwater distributary channel microfacies,which is also the main quality reservoir development phase band.Shang Wuerhe Formation of Permian reservoir rocks are coarse-grained lithic sandstones and pebbly sandstones,low structure maturity and compositional maturity,poor physical properties,especially low porosity and low permeability reservoir,reservoir space mainly for dissolution pores.Reservoir property is mainly controlled provenance distance and sedimentary facies.Fan delta front from the source area farther underwater distributary channel microfacies is mainly developed high quality reservoir facies and provenance closer distance fan delta plain development and siltstone,mudstone,sandy coast shallow lake,reservoir generally rudimentary.