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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Most phases of oil and gas operations in the Four Corners-Intermountain area showed declines for 1987. Exploratory drilling slipped 6.5%, while development drilling plummeted 51.9% for a 16-year low. Reflecting the decline in drilling of new wells and depletion of existing wells, oil production declined to 8% from 1986. Gas production declined 9.1%.
Difficult-to-produce, low-gravity crude was discovered in Devonian and in Pennsylvanian rocks by 2 wells just south of Tertiary production at Eagle Springs field, Nevada. An apparent discovery in Tertiary tuff 18 mi north of the Devonian Blackburn field, Nevada, opened up a new producing area. Pennsylvanian carbonates provided significant discoveries in the Paradox basin.
Coal-bed gas is taking an increasing role as a source of methane. Horizontal drilling technology has been introduced into the San Juan basin, but results are not yet known.
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