Abstract
This paper covers the essentials of the tools, and practice of basic Russian well logs and Russian log analysis techniques. Emphasis is placed on those tools used in Russia which are significantly different than their counterparts in other major petroleum producing provinces.
The BKZ Kapotax is five Russian lateral electrical resistivity logs run at different spacings depending on the reservoir thickness. It is used to calculate true formation resistivity. The technique corrects for mud and borehole effects using response curves modeled for a lateral log. This technique uses different tool spacings, borehole size, mud resistivities, diameter of invasion and the resistivities of the five laterals.
This paper presents the BKZ method for predicting the true formation resistivity from this combination of lateral logs. Laterals were the primary resistivity log recorded by Russians before the early 1980’s. Now the induction conductivity log is also being used, but not in the BKZ technique for determining Rt. Only lateral devices are used for this determination.
By using the BKZ method, quantitative information may be extracted from historically recorded data and allows improved evaluation of reservoirs in previously drilled wells.