Dynamic Reserve Evaluation Of Upper Paleozoic Gas Reservoirs In Block X Of G Gas Field

The Upper Paleozoic gas reservoir type in Block X of G gas field is a tight sandstone gas reservoir.The characteristics of low permeability,low porosity,strong heterogeneity and downhole throttling production mode lead to the lack of a systematic dynamic reserve evaluation system in the study area.Therefore,based on the geological and production characteristics of Block X,this article analyzes the adaptability of traditional dynamic reserve evaluation methods,and aims to establish a dynamic reserve evaluation system for downhole choke-producing gas wells suitable for low-permeability gas reservoirs in Block X.Aiming at the problem that some gas wells with complex production conditions have errors in calculating dynamic reserves using traditional evaluation methods,an innovative dynamic reserve prediction model based on the combination of gray correlation theory and multiple linear regression was established to accurately evaluate dynamic reserves for the study area Provides strong support.This paper firstly studies and analyzes the geological characteristics of the Upper Paleozoic and the production performance characteristics of gas wells in the study area;secondly,evaluates the traditional dynamic reserve evaluation methods,analyzes the adaptability of the dynamic reserves according to the geological and production characteristics of the study area,and determines the adaptability The dynamic reserve evaluation system of the block;then for some gas wells in the study area that have large initial production fluctuations,rapid pressure drops,water production and fluid accumulation,and other complex dynamic production factors,there are errors when calculating dynamic reserves using traditional dynamic reserve evaluation methods.Problem,innovatively established a new model for predicting dynamic reserves based on gray correlation theory and multiple linear regression,and through practical applications to determine that the model is suitable for block X;finally according to the gas wells under different production conditions according to the established dynamic reserves The evaluation system and the established prediction model calculate the dynamic reserves of all the production wells of the Upper Paleozoic gas reservoirs in the study area.The calculation results show that the average dynamic reserves of the Upper Paleozoic gas reservoirs in Block X are 0.47×10~8m~3,and the total is 378.85×10~8m~3.The results of dynamic reserves analyze and study the extent of reserves production in the study area.The research results of this paper have important guiding significance for improving the degree of reserves production in the study area and optimizing the development plan.