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Abstract


 
Chapter from: M 66:  Hydrocarbon Migration And Its Near-Surface Expression
Edited By 
Dietmar Schumacher and Michael A. Abrams

Authors:
Norman R. Carlson and Kenneth L. Zonge

Geochemistry, Generation, Migration

Published 1996 as part of Memoir 66
Copyright © 1996 The American Association of Petroleum Geologists.  All Rights Reserved.
 

Carlson, N., and K. L. Zonge, 1996, Induced polarization effects associated with hydrocarbon accumulations: minimization and evaluation of cultural influences, in D. Schumacher and M. A. Abrams, eds., Hydrocarbon migration and its near-surface expression: AAPG Memoir 66, p. 127-137.
 
Chapter 10
Induced Polarization Effects Associated With Hydrocarbon Accumulations: Minimization 
and Evaluation of Cultural Influences
Norman R. Carlson
Kenneth L. Zonge

Zonge Engineering and Research Organization, Inc.
Tucson, Arizona, U.S.A.
 

Abstract

The use of induced polarization (IP) Previous HitmethodsNext Hit in oil and gas exploration dates back to the 1930s, but the validity of anomalies has been difficult to establish. Although recent geochemical and downhole research has verified the source of IP anomalies in some geologic environments, the influence of cultural (anthropogenic) features on the Previous HitelectricalNext Hit data remains a serious stumbling block to the acceptance of Previous HitelectricalNext Hit Previous HitmethodsTop in oil exploration. Spurious effects from power lines, pipelines, fences, and well casings can be misinterpreted as anomalies from hydrocarbon alteration or can mask true alteration anomalies.

The cultural problem is not insurmountable, however, and it is not valid to assume automatically that all IP anomalies measured over oil fields are the result of culture. A case study of the development of an oil field near Post, Texas, illustrates how proper survey design can be used to minimize and evaluate the effects of culture in the interpretation of IP survey data. Evaluation of before-and-after IP data sets and two-dimensional finite element modeling strongly support the interpretation that the observed IP anomaly results from hydrocarbon-induced alteration and not from well casing or other cultural effects. Furthermore, the interpreted extent of the IP anomaly as defined in 1982 agrees well with the productive limits of the field as it exists more than 12 years later.

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