礁滩相碳酸盐岩气藏气层下限标准研究

普光气田是中石化在川东北探区首个投入开发的大型礁滩相碳酸盐岩气田。由于气田埋藏深、储层储集空间类型多样、储层物性在纵横向上差异大,且具有多套气水系统等特征,导致物性较差的Ⅲ类气层和气水过渡带处气、水层识别难度大。本文在储层储集空间类型判别基础上,利用测井、试气、分析化验等资料,建立单位气层厚度产能与渗透率、含水饱和度和孔隙度、电阻率与孔隙度等各种交会图版,识别气层、干层、水层,确定出了普光气田气层物性、电性等下限标准。研究成果直接指导了普光气田气水关系研究、井位部署及井型优化、投产层段优选、储层改造措施确定等,取得较好效果,并为气田动用储量评价打下基础。

Minimum standard of gas pay identification for reef flat carbonate rock reservoir

Puguang Gas Field is a large reef flat carbonate rock gas field which is firstly put into production in the northeast of Sichuan by SINOPEC.Due to the characteristics of deeply buried reservoir,various types of reservoir spaces,large vertical and horizontal differences in reservoir properties and multiple sets of gas water systems,it is very difficult to distinguish the gas and water layers of Ⅲ type gas pay with poor property and gas-water layers in the transition zone.On the basis of identification of reservoir space type,this paper established the various kinds of cross plots such as capacity of unit thickness in the gas pay and permeability,water saturation and porosity,resistivity and porosity to distinguish gas,dry layers and water layers,and identified the minimum standards of physical and electrical properties for gas pays by using the data of logging,gas testing and experiment,which provided direct guidance for studying the relationship between gas and water,well location deployment,well track optimization,producing interval optimization and determination of reservoir adjustment measure with a good effect,and also laid a foundation for evaluating the producing reserves.