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Technical Papers: Application of Innovative Technologies to Fractured Devonian Shale Reservoir Exploration and Development Activities

Society: SPE
Paper Number: 84816
Presentation Date: 2003
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Abstract

This project was conducted under the auspices of NYSERDA contract 4881-ERTER-ER-99 with its primary purpose to obtain and use “ground-truth” data collected from two Upper Devonian shale wells. With this information a better understanding of the productive potential in western New York has been obtained.

Both wells (W. Stein Unit No. 2 and S. Preston No. 8) were drilled in August 2001 by Great Lakes Energy Partners LLC and are located in Athens field Crawford County Pa., adjacent to the Tyrone Mount Union lineament. The wells were completed open hole without any stimulation.

Technologies used to acquire this information include running geophysical logs, gas sample analysis, and examining ten rotary sidewall cores from the Stein Unit No. 2. From this data, various models were built to characterize geologic reservoir and fluid flow characteristics, and were used to estimate gas in place, bulk, permeability, and deliverability.

Though the existent natural fracture systems provide conduits from the reservoir to the wellbore, the shale in this area contains only a limited quantity of gas-in-place and is exceptionally lean in organic content. Permeability studies indicate this is a dual-porosity system producing primarily via the fractures, and, to a lesser extent, from the matrix. Very little adsorption of gas is present and the reservoir is relatively low in organic content. An analysis conducted by the University of Michigan reveals that the gas is primarily thermogenic in origin with possible traces of biogenic origin.

The results of this paper are significant because they provide a better understanding of the production mechanisms of the reservoir within a localized area.

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