摘要
由于中基性火山岩储层的特殊性,很难利用传统的导电模型求准含气饱和度。为准确计算储层含气饱和度,对研究区中基性火山岩储层孔隙类型、特征及岩电实验资料进行了研究,结果表明:储层孔隙类型主要有气孔、溶蚀孔及微缝,且具有超高孔喉半径比,储层中存在不导电孔隙和导电背景;对Maxwell导电模型进行分析推导,将总孔隙分为导电孔隙和不导电孔隙,引入孔隙联通因子,得到导电孔隙度;应用电导率叠加原理,建立了基于导电孔隙的原始含气饱和度模型,该模型处理的含气饱和度与毛管压力分析饱和度相比,平均绝对误差小于3%,且与试气资料具有较好的一致性。
Because of the particularity of neutral and basic volcanic reservoir,it is difficult to compute its gas saturation by the traditional electric conduction model.Through the study on the type and feature of pore and on the litho-electric experimental data of neutral and basic volcanic reservoir,the paper finds that the main pore types are blowhole,corrasion hole and micro-crack,which is of extremely high pore throat radius ratio;there is non-electric conduction pore in the conductive background.Because of this,through the analysis of Maxwell conductivity model,the total porosity can be divided into conductive porosity and non-conductive porosity.By introducing communicating pore factor,the paper gets the conductive porosity.With the principle of conductivity superposition,the model of the reservoir gas saturation based on the conductive pore is obtained.Comparing with the saturation from the analysis of capillary pressure data,the gas saturation by this model is of less than 3% mean absolute error,and agrees with the well testing data.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2011年第3期915-920,共6页
Journal of Jilin University：Earth Science Edition
基金
国家重点基础研究发展计划项目(2009CB219300)
关键词
饱和度
电导率
中基性火山岩
导电孔隙
Maxwell导电模型
saturation
electric conductivity
neutral and basic volcanic reservoir
the conductive pore
Maxwell conductivity model
