Abstract
A logging tool overcame questionable results obtained by routine core analysis and other conventional techniques for identifying permeable zones. For this test, Lomax Exploration Co., in conjunction with the US Department of Energy (DOE), used Numar corp.'s magnetic resonance imaging log (MRIL) in the Monument Butte field, Duchesne County, Utah. The tool also enhanced the interpretation of conventional logs over the two zones of interest. Because of interbedded sands, shales, and silts, cores collected just inches apart can yield very different permeability and porosity values. As a result, sidewall core analysis has historically been misleading. Lomax Exploration felt that MRIL could improve permeability determinations for secondary recovery projects as well as aid in evaluating zones for initial production in the Uinta basin. The paper describes the Uinta basin, MRIL, MRIL logs, and well completion.
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