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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 69 (1985)

Issue: 4. (April)

First Page: 567

Last Page: 581

Title: Regional Source Rock Mapping Using a Source Potential Rating Index

Author(s): Harry Dembicki, Jr. (2), Fredric L. Pirkle (3)

Abstract:

A method has been developed to combine sediment thickness, organic carbon content, and thermal-maturity data from potential source rock units into a single mappable parameter that can be used to indicate areas of potential hydrocarbon generation. This parameter is computed by multiplying the average percent organic carbon by the effective source rock thickness of a formation. This yields a richness factor that is then multiplied by maturity scaling factors to give source potential ratings for oil and/or gas generation. The rating values can be combined with kerogen type data, if available, to refine these assessments of generating potential. The rating index can also be used with burial history curves and thermal-maturation modeling to look at source potential during geol gic time. An example is given of the rating index mapping applied to the Bakken Formation in the Williston basin.

The source potential rating index provides objective, semiquantitative measures by which the source potential of a single formation can be compared within an area, or by which the source potential of two or more formations can be compared in the same or different basins. In conjunction with structural analysis of a basin, the resulting maps can help the explorer explain known hydrocarbon accumulations, trace migration pathways, and point toward new areas for exploration.

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