The Study On Reservoir Characteristics Of The Nine 8 District Qigu Formation Of Karamay Oilfield And Its 3D Geological Modeling

Due to the influence of factors such as high viscosity of crude oil and poor development methods,most of the production wells in the Karamay Oilfield in the nine8^th area are short or nearly out of production.Therefore,this requires geologists to carry out further exploration on the basis of predecessors’geological knowledge and obtain more profound and detailed understanding.Based on the reservoir and geological data of the research area,this paper analyzes the stratum development and tectonic evolution patterns in this area,division and contrast of the three small layers of the previous research division,and divides the results into eight single sand layer,and it is found that the small layers are evenly distributed in the area and the thickness changes little.Through the study of sedimentary microfacies division on the body level reveals the genetic type,geometry and distribution of the sand body,and maps the corresponding distribution plane of the microfacies,it was found that the sedimentary facies of the study area belonged to the braided fluvial facies,and in each single layer,it is mainly deposited by rivers and floodplains.Through the the observation of the core and data analysis to obtain the petrological characteristics of the reservoir.And sum up the characteristics of lithology,physical properties,oil and gas properties and electrical properties respectively of the reservoirs in the area,and simultaneous analyze its four character,it was found that fine sandstone,medium sandstone and pebbly sandstone in this area are the major oil-bearing lithologies.According to the logging curve characteristics of the coring well,combined with previous research results to establish a new lithology,porosity,permeability and oil saturation model,and on the basis of the above log interpretation model,the parameters of the 98411 well in the area were interpreted to verify the accuracy of the interpretation model;application of Petrel software to establish 3D geological feature model of reservoir in this area,combining regional geological features with logging data,according to the modeling steps,implements the data processing and establishes construction model,lithofacies model and reservoir property model of the work area respectively,which provides the basis for the calculation of the next step reserves and the remaining oil distribution,and provides a solid geological research basis for the fine description of the later oil fields.