Based on actual field data from the South Wilburton field in eastern Oklahoma, this paper presents an approach to original gas in place (OGIP) estimation in gas fields during early development. This approach integrates material balance and Fetkovich decline curve analysis, both classical techniques. These classical techniques are enhanced with modern digital tools such as digital recorders and microcomputers, which in many cases eliminate the requirement for lengthy shut-ins and extensive manipulation and filtering of data. Thus, OGIP estimates can be arrived at quickly and in a practical manner during the development of a new field with confidence stemming from convergence of the two techniques. This allows the working interest owner to reassess and modify developmental strategies and play participation. The approach has been utilized in the development of the South Wilburton field and has assisted developmental decision making.

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