The Deerfield oil field, representing the only commercial production from the Trenton formation in Michigan, is centrally located near the western boundary of Monroe County, 35 miles southwest of Detroit. Activity in this field which started during 1920 was renewed in the spring of 1927 and has continued intermittently to the present time.
This field, the northward extension of the "Bowling Green fault" or "drop-off," is on the northern and western edges of a north-plungingstructural nose on the northwestern flank of the Cincinnati arch.
The Trenton formation is encountered at depths ranging from 2,050 to 2,110 feet. The producing zones are of secondarily crystallized dolomite and occur at various depths in the upper 125 feet of the Trenton. A non-productive area on top of the anticline is caused by a greater westward dip of the oil zones than of the Trenton formation.
The productive closure is a 40- to 50-foot "halo" on the north and west flanks of the fold. The productive area is, therefore, approximately 220 acres with a total estimated recovery of 2,500 barrels per acre. This reservoir is of the gas-expansion type with no apparent water drive. The oil is dark green and has a gravity of 42.7º and a sulphur content of 0.17 per cent. Forty producing wells have been drilled into the field and seventeen of these are now on production.
Two tests have been drilled below the Trenton. The deepest test, the Consolidated Development Company’s Lamont Bragg B-2, reached the total depth of 3,250 feet. It was estimated that the granite would have been encountered at approximately 3,800 feet.
Figures & Tables
Structure of Typical American Oil Fields: A Symposium of the Relation of Oil Accumulation to Structure
Modern petroleum geology in the United States had its beginning in the first decade of the 20th Century when the U.S. Geological Survey began mapping the structure of the rocks in and near old fields in order to discover the various types of structural conditions under which oil and gas are trapped. Structural geology has evolved as a branch of the broader science far more rapidly than have methods of mapping the attitude of rocks at the surface. This volume, published in the late 1920s, was designed to afford authoritative and modern descriptions of the structure of typical oil fields in the United States. Each of the 39 fields contained here is described by an author who is intimately familiar with the available data. The relationship of structure at the surface and at depth for different terranes is clearly set forth wherever the strata are not parallel. The volume concludes with a summary paper on the role of geologic structure in the accumulation of petroleum. Fields include: Florence, Colorado; Stephens, Arkansas; Kevin-Sunburst, Montana; Bradford Pennsylvania; and Salt Creek, Wyoming.