The initial well in the Comanche Ranch field was drilled to a total depth of 6,730 ft on April 2002 and reached the basal Glen Rose of the Cretaceous. The prospect was originally intended to be a Glen Rose reef play based on 3-D seismic acquired in 2001.

Since the discovery oil well was so prolific, Saxet Petroleum Inc. has kept two rigs drilling continuously and has drilled over 10 successful wells.

The reservoir is not a reef but is composed of carbonate rocks deposited as a reworked forereef facies. These rocks have undergone episodic tectonism including joint fracturing and thrusting, as well as alteration via hot hydrodynamic flow of deep-seated acidic fluids. These fluid incursions have metamorphosed localized areas, creating secondary porosity and permeability that now define the trapping mechanism. There is also evidence of secondary hydrocarbon migration.

Many of the initial wells have been conventionally cored and this information is still being analyzed.

This paper is a very preliminary report and a synthesis of Saxet Petroleum's activities to date. There remain many unanswered questions about Comanche Ranch Field. What are the defining reservoir parameters, the ultimate reserve potential, the proper well stimulation and completion procedures, the reservoir diagenetic history, the geologic history, and perhaps most importantly, what is the significance of the field to future exploration efforts in the region?

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