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Hydrocarbon Index Mapping of the Eagle Ford Formation, Southeast Texas Giddings Field--a Simple Quantitative Alternative Exploration Technique.

Sam Lyssy
Clayton Williams Energy, Inc. Midland, Texas

The Eagle Ford formation in the Giddings Field of southeast Texas exhibits variable stratigraphic and lithological properties across a large geographical area of prospective hydrocarbon reservoir. Petrophysical and core analysis combined with resistivity mapping suggests that localized reservoir enhancement or “sweet spots” can be identified using a simple mathematical approach informally referred to as EHI or Eagle Ford Hydrocarbon Index. The value of this calculation is that it transcends variations in Eagle Ford stratigraphy, providing a simple tool which can be used to improve the identification of enhanced reservoir conditions associated with either primary or secondary (fractures) hydrocarbon filled porosity.


AAPG Search and Discovery Article #90164©2013 AAPG Southwest Section Meeting, Fredericksburg, Texas, April 6-10, 2013