低孔渗泥质砂岩三水孔隙结合导电模型及其在海上油田的应用  

Three-water pore combination conductive model for low porosity and permeability shaly sand and its application to offshore oilfields

作　　者：宋延杰[1] 陈济强[1] 唐晓敏[1] 王瑛[2] 

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]中海油田服务股份有限公司油田技术事业部,北京101149

出　　处：《大庆石油学院学报》2010年第6期100-105,共6页Journal of Daqing Petroleum Institute

基　　金：黑龙江省自然科学基金项目(TE2005-24)

摘　　要：针对低孔渗泥质砂岩储层孔渗低、孔隙结构复杂、微孔隙水高等特点,利用电导率差分方程和三水导电理论,建立低孔渗泥质砂岩三水孔隙结合电阻率模型.采用单参数变化方法,考察胶结指数和饱和度指数变化对模型预测的岩石导电规律的影响,得出电阻增大系数随黏土束缚水胶结指数和饱和度指数的增大而增大,随可动水胶结指数和微孔隙水胶结指数的增大而减小.利用储层温度压力下岩心实验数据,通过计算电导率与测量电导率对比,表明该模型能描述海上低孔渗泥质砂岩储层的导电规律.利用实验确定的胶结指数和饱和度指数以及经验确定的微孔隙水和黏土束缚水孔隙度进行实际应用,表明该模型可用于海上低孔渗泥质砂岩储层定量评价.Since the reservoirs have low porosity and low permeability,complex pore structure,high capillary bound water,new conductance theory will be used to describe conductivity for the reservoirs.A three-water pore combination conductivity model is proposed for low porosity and low permeability shaly sand reservoirs based on conductivity difference equation and three-water conductance theory.The effect of cementation exponent and saturation exponent on rock conductivity predicted by the model is investigated by only changing one of them,and the result shows that resistivity index increases as exponent of clay bound water or saturation exponent increases,decrease as exponent of free water or exponent of capillary bound water increases.It shows that this model can describe conductance law in offshore low porous and permeable shaly sand reservoirs by comparing measured conductivity with calculated conductivity under reservoir temperature and pressure.Log interpretation with calculated cementation exponent,saturation exponent and capillary bound water porosity,clay bound water porosity also shows that this model is quantitatively applicable to offshore low porous and permeable shaly sand reservoirs.

关 键 词：低孔渗储层 孔隙结合导电理论 三水导电理论 电阻率模型 

分 类 号：P631.4[天文地球—地质矿产勘探]