Permeability is the key parameter for reservoir characterization. The permeability of the formation is usually evaluated from the cores and/or well tests. It should be noted that cores and well test data are often only available from few wells in a reservoir while the well logs are available from the majority of the wells. Therefore, the evaluation of permeability from well log data represents a significant technical as well as economic advantage.

The evaluation of permeability in heterogenous formation from well log data however represents a difficult and complex problem. Generally, a simple correlation between permeability and porosity cannot be developed in heterogenous formation. The goal of this study has been to develop a generalized methodology to determine the permeability of a heterogeneous formation utilizing geophysical well logs as well as other geological information.

Granny Creek Field in West Virginia has been selected as the study area in this paper. This field has produced oil from Big Injun Formation since early 1900's. The waterflooding operation was initiated in 1970's and currently is in progress. Well log data are available on substantial number of wells. Core samples are also available from a few wells. Core samples and the well logs were analyzed to determine permeability, porosity and water saturation. The results of core and log analysis were complemented by geological interpretations to develop a correlation between permeability and well log responses. The results presented in this paper could serve as a guideline for correlating permeability with well logs responses in heterogeneous formations. A systematic and synergetic approach which integrating data from various well logs as well as depositional, lithological and sedimentological interpretations has been developed to evaluate the permeability.

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