不同泥质分布形式泥质砂岩导电规律实验研究

本文利用人工制作的不同含量分散泥质和层状泥质砂岩岩心样品，测量不同矿化度和不同含油饱和度的岩心电阻率，从实验角度研究了不同泥质分布形式和含量的岩心导电规律，结果表明，泥质分布形式或含量不同，则泥质砂岩导电规律不同.基于层状泥质与分散泥质砂岩的并联导电实验规律，以及分散粘土和地层水混合物的导电规律可用HB电阻率方程描述，建立了考虑泥质分布形式影响的泥质砂岩电阻率模型.通过1组不同泥质分布形式泥质砂岩人造岩心实验数据的测试，表明该模型可以描述分散泥质砂岩、层状泥质砂岩和混合泥质砂岩地层的导电规律.分散泥质,层状泥质,人造岩样,实验测量,并联导电,HB方程,电阻率模型

Experimental study of conductance mechanism in laminated and dispersed shaly sands

In the paper, shaly sand samples with variations of dispersed clay content and laminated shale content have been designed and manufactured for the first time. Core sample resistivity is measured in different water salinity and oil saturation. Effects of shale distribution and shale content on conductance mechanism in shaly sands are studied with measured data, and it shows that shale distribution and shale content variation can cause different conductance rules for shaly sands. Based on the experimental result of parallel conductance between laminated shale and the dispersed shaly sand, and the assumption under which conductance of mixture of dispersed clay and water can be described with HB resistivity equation, a resistivity model for laminated and dispersed shaly sands is established. A set of artificial sample data with different dispersed clay contents and laminated shale contents shows that the proposed resistivity model can describe conductance mechanism for dispersed shaly sands, laminated shaly sands, also for dispersed and laminated shaly sands.