致密砂岩气藏采收率影响因素灰色关联分析

Grey Correlation Analysis of Factors Affecting the Recovery Rate of Tight Sandstone Gas Reservoirs

鉴于致密砂岩气藏非均质性强、储层物性差、采收率较低等难题,进行了致密砂岩气藏采收率的影响因素研究。以苏里格气田为研究对象,从岩心实验研究成果出发,应用灰色关联分析法计算地质、开发各方面因素影响采收率的关联度,通过对比分析确定各参数的影响程度。结果表明:致密气藏采收率的最主要影响因素是储层渗透率,其次是垂直-水平渗透率比、孔隙度、储层厚度、采气速度。在苏里格气藏后期开发方案设计中,根据致密气影响采收率的主要因素来调整参数,为提高采收率对策的制定提供支撑。

Given the challenges of strong heterogeneity,poor reservoir properties,and low recovery rate in tight sandstone gas reservoirs,in-depth research was conducted on the factors affecting the recovery rate of tight sandstone gas reservoirs.Taking the Sulige gas field as the research object,starting from the research results of core experiments,the grey correlation analysis method is applied to calculate the correlation degree of geological and development factors affecting oil recovery,and the degree of influence of each parameter is determined through comparative analysis.The calculation results prove that the main influencing factor on the recovery rate of tight gas reservoirs is reservoir permeability,followed by the vertical to horizontal permeability ratio,porosity,reservoir thickness,and gas production rate.In the later development plan design of Sulige gas reservoir,parameters are adjusted based on the main factors that affect oil recovery of tight gas,providing support for the formulation of measures to improve oil recovery.