Abstract：Based on the effective medium HB resistivity models in laminated or dispersed shaly sands proposed by Berg,the general effective medium HB resistivity model in laminated and dispersed shaly sands is established in the paper. In the derivation of the model we assume that clay-bound water fraction is included in total pores,the resistivity of clay-bound water and formation water has not been considered,and their differences are incorporated into clay grain conductivity. By analying influence parameters of the model,we find out that shale distribution largely affects water saturation calculated by the model,the less the resistivities of sand grains or clay grains,the more largely the resistivities of grains affect the relation between C, (conductivity of shaly sands )and S, r (total water saturation),the effect of m (cementation factor)(m=n). Testing on artificial samples with conducting rock grains,it proves that the model can be applied in clay-free porous rocks with conducting grains,but formation water resistivity must be less than rock grain resistivity. Testing on rock sample data in dispersed shaly sands,it shows that introducing another parameter to the model can decrease the relative error of fitted Cl. However,when we consider the difference of electrical properties between clay-bound water and formalion water in the model,although another parameter is added to the model,the relative error of fitled Ct is increased slightly. Testing on logs in laminated shaly sands,it demonstrates that the model.
宋延杰, 吕桂友, 王春燕, 李鹏举. 混合泥质砂岩有效介质通用HB电阻率模型研究[J]. 石油地球物理勘探, 2003, 38(3): 275-280.
Song Yanjie, Lü Guiyou, Wang Chunyan, Li Pengju. Study of general effective medium I-IB resistivity model in mixed shaly sands. OGP, 2003, 38(3): 275-280.
