The field is located at the juncture of Pike, Gibson, and Warrick counties, Indiana, where the surface formations are of Pennsylvanian age. The regional dip amounts to 35 feet per mile to the southwest, and the collecting structures are mere pimples upon the regional slope. Surface structure does not coincide with subsurface dips, the lime-stone outcropping in the field showing production coming from a syncline. The oil sand manifests evidences of lens-like accumulation and may be responsible for the arching of the overlying rocks.
The Oakland City sand or the Mooretown sandstone forms the reservoir for petroleum. Gas is entirely lacking; each well had to be shot and put on a pump to secure production. Water is almost a negligible quantity, and the amount handled with the oil is decreasing. The crude is of good quality, green to brown in color, and fairly high in gasoline content. Production is light; consequently development has been slow.
Figures & Tables
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 30 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. Fields include: McKittrick, California; Fairport, Kansas; Urania, Louisiana; Artesia, New Mexico; Burbank, Oklahoma; Cabin Creek, West Virginia; and Luling, Texas.