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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


 
Chapter from: M 61: Basin Compartments and Seals 
Edited by 
Peter J. Ortoleva

Authors:
Gerilynn R. Moline, Jean M. Bahr, and Peter A. Drzewiecki

Methodology and Concepts


Published 1994 as part of Memoir 61
Copyright © 1994 The American Association of Petroleum Geologists.  All Rights Reserved.
Chapter 14

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Permeability and Porosity Estimation
by Electrofacies Determination

Gerilynn R. Moline
Jean M. Bahr
Peter A. Drzewiecki
University of Wisconsin--Madison
Madison, Wisconsin, U.S.A.


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ABSTRACT


Low-permeability seals associated with abnormal pressures are most commonly identified by examining vertical pressure profiles and noting the depths at which a major change in the pressure gradient occurs. Alternatively, zones of very low permeability that may act as fluid seals may be identified on the basis of core analyses and well tests. Often, however, there are an insufficient number of direct pressure or permeability measurements to adequately identify the depth and lateral extent of these seals. A method has been developed for estimating porosity and permeability through the use of wireline logs. Multivariate statistical techniques are used to segment the logs and group the segments into electrofacies types. Application of this technique to 18 wells within the St. Peter Sandstone of the Michigan basin shows that the electrofacies characterization reflects both the hydraulic and diagenetic characteristics of the formation. Six electrofacies types have been identified, one of which has characteristics similar to those found within seals in other basins.

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