%0 Journal Article
%T A new approach in rock-typing, documented by a case study of layer-cake reservoirs in field
%A Granier Bruno
%J Carnets de G¨Ļologie
%D 2003
%I Carnets de G¨Ļologie
%X In carbonate reservoirs, the relationship between porosity  , a measure of the combined volumes of several kinds of pore space (e.g. interparticle and separate-vug), and permeability K are neither linear nor logarithmic, hence only weakly correlatable. Approaches to an estimation of permeability that employ both petrographical and petrophysical parameters, the so-called rock-typing techniques, have proven to be the most nearly precise. However in many studies simple K/  cross-plots are used for each rock-type to provide trendlines from which K values are derived as a function of   values; this is common practice even though the coefficient of correlation r2 departs significantly from 1.This paper describes and provides examples of an improved technique of rock-type classification in which each rock-type is characterized by a discrete and unique Gaussian distribution of log K. It facilitates upscaling for it suggests the use of a single geometric mean value for permeability and a corresponding standard deviation (variance, or coefficient of variation) for each rock-type.This new technique can be used in uncored wells by extrapolating these determinations into wireline logs as documented below in a case study of layer-cake reservoirs in a field of the Abu Dhabi offshore (U.A.E.).
%K petrophysics
%K sedimentary petrography
%K limestone
%K dolomite
%K chalk
%K rock-typing
%K porosity
%K permeability
%K rock-type
%K Abu Dhabi
%U http://paleopolis.rediris.es/cg/CG2003_A04_BG/index.html