用侧向与感应电阻率比值识别低渗透率储层流体性质  

On Identifying Low Permeability Flood Reservoir with Ratio of Laterolog to Induction Resistivity

作　　者：杨洪明 谢丽[2] 马建海[2] 何金兰 肖兴怀 

机构地区：[1]中国石油集团测井有限公司青海事业部,甘肃敦煌736202 [2]青海油田分公司,甘肃敦煌736202

出　　处：《测井技术》2005年第1期49-51,共3页Well Logging Technology

摘　　要：柴达木盆地低孔隙度低渗透率储层具有钙质含量高、孔喉半径小、储层骨架电阻率高的特点。储层无论是含油还是含水都具有较高电阻率,仅靠含油饱和度不足以准确判断储层所含流体性质。利用同时测量双侧向、双感应电阻率的有利条件,依据侧向串联测井受高阻影响反映地层骨架、感应测井并联测井受低阻影响明显反映流体性质的特点,确定每个储层的侧向电阻率与感应电阻率比值,建立电阻率比值与孔隙度交会图定量解释图版;结合孔隙度、含油饱和度定量解释图版,建立双图版定量解释标准,提高了低孔隙度低渗透率储层测井解释符合率。In caidamu basin, there is a kind of low porosity and permeability stratum with rich calcium,small apertures and high resistivity.It's not enough to correctly judge the liquid's character in the stratum according to the oil saturation because the stratum resistivity is always high whatever there is oil or water in the pores. Dual-laterolog and dual-induction log created favorable conductions for reservoir fluids identification.The dual-laterolog measures rock's resistivity mainly because of it's “series-connection” logging method but is influenced by high resistivity rocks; the dual-induction log measures liquid's resistivity and reflects liquid's characters mainly because of it's “parallel-connection” logging method but is influenced by low resistivity. With the advantages of dual-laterolog and dual-induction log curves which are always measured in each well,we figured out the ratio of laterolog to induction resistivity and established quantitative interpretation cross plot of resistivity ratio VS. porosity.Combining with the quantitative interpretation cross-plot of porosity VS. oil saturation and resistivity ratio VS. porosity, we established quantitative interpretation standard of dual crossplots and finally improved the interpretation accuracy of low porosity and permeability strata.

关 键 词：双侧向测井 双感应测井 低渗透率储层 电阻率比值 流体识别 

分 类 号：P631.811[天文地球—地质矿产勘探] TE122.24[天文地球—地质学]