Geochemical Orientation Over Blackburn Oil Field, Nevada The Blackburn field, which was discovered by Amoco Production Company in March 1982, is a structural trap above a low-angle extensional fault (Flanigan, 1994). Oil generated in the Dale Canyon Formation north of the field has migrated up-dip to the Blackburn structure since middle to late Pliocene time. As of the end of 1993, the field produced 3.1 MMBO (250-300 API, 0.4-0.7% sulfur) from Devonian, Mississippian, and Oligocene reservoirs. In 1990, free gas was collected from 9’-deep wells at ¼-mile intervals on ½-mile spaced lines. The free gas was analyzed for C1-C6 hydrocarbons. As indicated in the bubble plot, normal hexane is anomalous over the Blackburn field and to the north of the field. The source of the anomaly north of the field could be the Dale Canyon source rock or another structural high with contained hydrocarbons.

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