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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 63 (1979)

Issue: 11. (November)

First Page: 2117

Last Page: 2117

Title: Geochemical Prospecting for Stratigraphic Traps: ABSTRACT

Author(s): William E. Harrison

Article Type: Meeting abstract

Abstract:

Petroleum geochemistry has received considerable attention in recent years and has emerged as a useful tool in exploration efforts. Most of the methods currently being used find maximum benefit and application in frontier exploration areas. Such studies generally provide information on source-rock quality, maturity level, and migration history. Some techniques, however, are applicable to more mature petroleum provinces and are especially suited for stratigraphic-trap exploration efforts. One such method involves pyrolysis of samples (well cuttings) and measurement of the quantity of hydrocarbons that are volatilized. Detecting, quantifying, and mapping hydrocarbon content of samples from specific stratigraphic units help to assess proximity to oil accumulations.

As oil moves to a trap, small quantities of hydrocarbons are invariably left in the rocks which served as avenues of migration. Concentrations of these hydrocarbons are highest near an oil accumulation and become progressively lower at greater distances from an accumulation. Concentration gradients can be mapped and interpreted in much the same way as conventional subsurface data and thus can provide the exploration geologist with a quantitative tool. Data are rapidly obtained, and information derived from initial boreholes can be used to help position subsequent tests. Preliminary results from several Mid-Continent study areas have been encouraging.

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Copyright 1997 American Association of Petroleum Geologists