Construction And Application Of 3D Structure Model For Quaternary Aquifer System In Western Plain Of Lli River Valley

Based on 3D geological modeling technology,this study introducedthethree-dimensionalgeologicalmodelingand reserves calculation technology of the petroleum and mineral industriesintotheQuaternaryaquiferstructuralmodel constructionandpermeabilityanalysisofthehydrogeology industry.Based on the GOCAD 3D geological modeling technique,the complex and variable Quaternary geological structure and aquifer characterizations of the western plain of Ili River valley were studied.The geological structure,sedimentary environment and aquifer system structural characteristics of Quaternary in the plain were analyzed.The main research results are as follows:(1)Using the 3D geological structure modeling technique to model the Quaternary in the western part of the Ili River valley,we analyze the borehole data and the profile,and determine the boundaries of the Quaternary strata in the plain area and the fault location and spatial distribution.The three-dimensional geological structure model of the western plain of lli River Valley was constructed using GOCAD 3D geological modeling software,and the volume and geological structure of the various layers within the region were obtained.The results show that the strata within the area are relatively flat and there are three main control faults:Hongshanzui fault,Qingshuihe fault and Huocheng fault.The volume of the upper Pleistocene(Qp~3)in the study area is about5.25×10~111 m~3,the product of the Middle Pleistocene(Qp~2)is about8.75×10~111 m~3,and the volume of the lower Pleistocene(Qp~1)is about 4.9375×10~111 m~3.(2)Through statistical analysis of the Quaternary lithologic spatialstructureandthecontentandspatialdistribution characteristics of various lithologies in the study area,The lithology of major aquifers such as gravel,gravel,and pebbles is abundant in the area,but the distribution is uneven.They are mainly concentrated in the upper reaches of the modern river basin,paleochannels,and alluvial-diluvial fans.Among them,the gravel content is the highest,accounting for 32.9%of the total lithology.The clay content ranks second and the content is 14.6%.Because the lithologic structure in the study area is mostly an aerated water medium containing water-containing medium.Most of the aquifers in the area are dominated by multi-layered confined aquifers,and only the aquifers in front of the rivers and mountains in the study area are dominated.(3)By analyzing the characteristics of the permeability of the western plains,it can be seen that the permeability coefficient varies greatly throughout the entire area,and the permeability coefficient of various types of lithologies varies widely,and is slightly different from the ideal value.The permeability coefficient of the main aqueous medium basically conforms to the law.Through the three-dimensional structure chart of permeability coefficient,the permeability coefficient in the study area is generallybetween0-2m/dandthemaximumcanreach12m/d.Which is greater than 2 m/d of high permeability zone is mainly concentrated in the lli river alluvial plain,Huoerguosi River,Fruit Gully,and the front area of Wusun Mountain.In other areas of the plain area,the aqueous medium alternates with the aerated water medium,aquifer from coarse particles of the single structure of unconfined aquifer to multilayer structure containing fine grained soils of confined aquifer,the permeability becomes worse.