DESCRIPTION OF GROSS RESERVOIR HETEROGENEITY BY CORRELATION OF LITHOLOGIC AND FLUID PROPERTIES FROM CORE SAMPLES
Title:
DESCRIPTION OF GROSS RESERVOIR HETEROGENEITY BY CORRELATION OF LITHOLOGIC AND FLUID PROPERTIES FROM CORE SAMPLES
Author:
JOHNSON, C.R. GREENKORN, R.A.
Appeared in:
Hydrological sciences journal
Paging:
Volume 8 (1963) nr. 3 pages 52-63
Year:
1963-09-01
Contents:
This paper presents a method for the geologic assessment of the distribution, shape, and character of heterogeneity for reservoir studies. The goals of a supporting lithological study would ordinarily be (1) to subdivide the test reservoir into gross units each of which has a characteristic lithology significant to the performance of the reservoir, and (2) to describe the physical relationships of these gross units so that workable analogs of the reservoir can be constructed. To effect these goals from a scrutiny of subsurface core or outcrop samples, a single, or a set of lithological features significant to permeability and porosity must be not only identified but be capable of rapid evaluation so that a significant number of samples can be analyzed. From correlation of lithological features and flow properties, certain reservoir lithotypes can be identified, each of which has a characteristic permeability and porosity. By subdividing representative core samples into these lithotypes and correlating these from well-to-well, the three-dimensional distribution of these lithotypes can guide the construction of reservoir models. We have applied this method to core samples from a heterogeneous brine-saturated sandstone reservoir in central Oklahoma to provide an example of such a reservoir study. In this example, the reservoir was subdivided into lithotypes based on a cursory examination of 29 lithological features, five of which could be related to permeability and porosity.
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