二连油田中低孔隙度地层介电测井解释方法研究

二连油田宝饶内带储层一般为中低孔隙度特征，应用介电测井对储层的流体性质进行定量解释受到限制，实际生产中以定性解释为主。以介电测井理论为基础，系统分析了孔隙度、相移角、含水饱和度、泥质含量等参数对介电测井的影响，提出了利用相移角资料和定义含水指数判断储层流体性质的方法。考虑到泥岩束缚水含量较高，相移角受孔隙度、含水饱和度、泥质含量等参数的影响明显，在利用相移角进行定量解释时．认为相移角的测量值是岩石骨架、流体、泥质几部分的加权和，在不同的含水饱和度条件下作相移角与孔隙度的交会图。当含水饱和度大于10．7％时孔隙度与相移角为正比关系；当含水饱和度小于10．7％时孔隙度与相移角成反比关系。无论储层的孔隙度、相移角数值为多少，具有相同含水饱和度的资料点的斜率是相同的．即可以用资料点的斜率代替含水饱和度。

Dielectric Log Interpretation Method of Middle-low Porosity Reservoir in Er Lian Oilfield

The reservoir of Baorao intrazone in Er Lian oilfield is of middle-low porosity,the dielectric logging is accordingly restricted in its quantitative interpretation,and usually limited to qualitative identification.Based on the theory of dielectric logging,analyzed is the influence of porosity,water saturation,phase-shift angle,shale content,etc.on dielectric logging.Also,provided is a method of fluid identification with phase shift angle and the definition of watercut index.Since shale irreducible water con...