Date of Award

12-1987

Degree Name

Master of Science

Department

Geosciences

First Advisor

Dr. William B. Harrison III

Second Advisor

Dr. David A. Barnes

Third Advisor

Dr. W. Thomas Straw

Access Setting

Masters Thesis-Open Access

Abstract

The Lucas Formation in the West Branch Oil Field contains over 1000 feet of carbonates and evaporites deposited in restricted marine environments. Deposition ranged from a tidal flat environment (Richfield Member) to subaqueous basin central type deposition (Iutzi and Horner Members).

Early diagenesis of the Lucas Formation carbonates included dolomitization and related porosity development in certain depositional facies where physiochemical conditions were favorable. Significant porosity and permeability reduction occurred during burial resulting from anhydrite, celestite, and halite cementation. Calcite pseudopar and microspar (a neomorphic product) also reduced porosity.

Hydrocarbon production from the Lucas Formation in the West Branch Field is apparently restricted to early dolomitized diagenetic facies lacking significant later cements. Variation in reservoir quality is interpreted to be controlled by variations in diagenetic facies.

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Geology Commons

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