Отправлено: 03.02.09 10:49. Заголовок: Гоце Тенчов -- Tenchov

Петрофизик из Болгарии (вместе с Куртевым представлял болгарскую петрофизическую школу)
Я с ним познакомился примерно в 1974 году (по линии координационного совета каротажников стран экономической взаимопомощи -СЭВ)
Был такой координационнный совет (возглавляемый геофизическими администраторами и организованный В.C.Мануковым) который функционировал до распада СССР
Две публикации Тенчова (уже после его пребывания в Ливии) были опубликованы в Soc.Petr. Engineers

Journal of Petroleum Science and Engineering
Vol: 16, Issue: 1-3, September, 1996 pp. 71-79

Title: Temperature dependence of the electrochemical potential in shaly sands and SP log interpretation
Author: Tenchov, G.G.a
Affiliations: a. Department of Meteorology and Geophysics, Physics Faculty, Sofia University, J. Bautcher 5, Sofia 1126, Bulgaria
Abstract (English): Temperature dependence of the electrochemical potential in shaly sands was studied on core samples from 20° to 80°C. Using the Dual Water Model it was shown that the bound water volume increases with temperature. This effect was relatively high for brines and for shaly sands of low electrochemical activity. The SP reduction factor was very slightly affected by temperature. The possibility of evaluating water saturation in shaly sands using SP-GR logs was tested. A chart for evaluation of formation water resistivity was prepared from laboratory data. The results can help further development of well log petrophysical interpretation in hydrocarbon-saturated shaly sands.


===
Journal of Petroleum Science and Engineering
Vol: 21, Issue: 3-4, November, 1998 pp. 263-271

Title: Evaluation of electrical conductivity of shaly sands using the theory of mixtures
Author: Tenchov, G.G.a
Affiliations: a. Department of Meteorology and Geophysics, Physics Faculty, Sofia University, J. Bautcher 5, Sofia 1126, Bulgaria
Keywords: petrophysics; shaly sands; log analysis; electrical conductivity; cation exchange capacity
Abstract (English): On the basis of the theory of mixtures, an equation is proposed for the electrical conductivity of shaly sands. Using a simple shaly sand model, Waxman and Smits, Hill and Milburn's core data and regression analysis, the equation was specified. It was fitted using core data for water conductivity within 0.2 to 25 S/m. The equation satisfies core data with a mean relative error of about 3%. The theory of mixtures allows clarification of the physical meaning of the cementation exponent representing it as the coefficient of mixing of shaly sand components. The saturation exponent was represented as the coefficient of mixing of the pore fluids. In clean sands, the derived equation is reduced to the Archie–Dahnov equation. The equation allows one to derive the effective porosity of cores which in turn exhibits good correlation with water permeability. The working hypothesis that shale porosity has the same magnitude as the total porosity of the shaly sands was assumed. It allows to evaluate shale content of core samples from their electrical conductivity without using destructive analysis. The derived shale content correlates with the cation exchange capacity and mixture exponent. The equation can be combined with nonelectrical equations used in sonic, density and neutron logs, and applied in log analysis.

Publisher: Elsevier Science
Language of Publication: English
Item Identifier: S0920-4105(98)00072-2

Кстати, в этой статье есть ссылки и на меня с Элланским (принцип смешения)