A NEW APPROACH IN ROCK-TYPING, DOCUMENTED BY THE CASE STUDY OF LAYER-CAKE RESERVOIRS IN FIELD 'A', OFFSHORE ABU DHABI (U.A.E.)

摘要

This paper presents a case study of rock-typing drawn from an integrated reservoir study on layer-cake reservoirs in field "A", offshore Abu Dhabi. In many case studies, a K/O cross-plot for each rock-type provides a trendline that is used to derive the permeability K as a function of the porosity O. However, the rock-type classification we arrived at shows that these parameters are not correlated. Each rock-type is characterized by distinct Gaussian distributions for both log K and O. This leads us to a new and promising approach providing an easy way of up scaling as it suggests using a single geometric mean permeability value and the corresponding standard deviation (variance, or coefficient of variation) for each rock-type.