The U.S. Geological Survey is conducting an investigation of the oil and gas resource potential of the existing and proposed Wilderness Lands in the western United States. This paper discusses the procedures used to combine a variety of geologic and geographic data, along with logged information on wells and petroleum statistics, by applying computer and αigital cartographic techniques for the purpose of assessing the petroleum resources in the Wilderness Lands, The methodology briefly described in this paper involves a review by geologists of existing information and evaluating the geologic characteristics for each Wilderness tract to determine the favorability, or lack of favorability, for petroleum occurrence. The assessments of the petroleum resources are reported in two phases: by a designated qualitative rating of the petroleum potential for each Wilderness area, displayed on state maps; and by estimating the fractional amount of the oil and gas within each province or basin that occurs in the Wilderness Lands, expressed as probability distributions for the quantitative estimates. This is a progress report of the U.S. Geological Survey's work to date on the assessment of the petroleum potential of the western Wilderness Lands.

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