Overton Field is located in Smith and Cherokee Counties, Texas, approximately 20 miles southeast of Tyler on the western flank of the Sabine uplift in the East Texas basin. The field produces from the Taylor interval, the lowest member of the Jurassic Cotton Valley Sand (CVS). The Taylor in the field area has been divided into four mappable sand packages separated by shale intervals. As is typical of most production from the Cotton Valley, these sands have very low permeability, with the distribution of rock quality controlled by a complex depositional and diagenetic history. Data from the field document the low permeability and stratigraphic nature of the reservoir. Core data confirms deposition of these sands in a shore face environment. Thin section and SEM work highlight the effect of clay linings in inhibiting quartz overgrowths.

Discovered by American Petrofina in 1978, the field has experienced both an initial development phase and a more recent significant expansion and infill. Field production is currently in excess of 100 MMCFD with over 300 wells drilled. Integration of geologic and engineering data has resulted in optimized well locations and field extension as well as enhanced completion confirmed the orientation and extent of hydraulic fractures, aiding in optimal field development. This has resulted in significant additional natural gas resource development and production as well as an efficient and comprehensive development of the field. In addition, this field represents a model for low-permeability sandstone reservoir accumulation and development that can be applied in other hydrocarbon producing regions.

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