The Mid-Continent oil and gas region, in the broadest use of the term, includes all of Oklahoma, Kansas, and Arkansas, and all of Texas, Louisiana, and Mississippi excepting a strip less than 100 miles wide along the coast of those three states, and also eastern New Mexico and western Missouri—an area 900 miles in diameter, comprising about one-sixth of the total area of the United States. The productive strata in this vast region range in age from early Ordovician to Tertiary, and are scattered through formations exceeding 50,000 feet in aggregate maximum thickness. Productive beds younger than Paleozoic are confined to the Gulf Coastal Plain.
Present producing depths range from less than 100 feet to almost 9,000 feet, with no indication that production may not be found at much greater depths where the mantle of sediments is very thick.
Figures & Tables
The AAPG volumes of Structure of Typical American Oil Fields preceed this book, which was written as a sequel to those, and at first conceived as a third volume of the earlier work. This book is designed to review, modify and, if possible, clarify ideas with regard to the fundamental concepts of oil geology, utilizing, for this purpose, the material presented in the two earlier data-based volumes. To conform to the original standard set for it, this book has been kept relatively free from factual data and has been compiled rather as a summation, based upon the best available evidence, of present knowledge of the science. This volume does not include a discussion of the technique of field or laboratory geology, but does include papers divided into 7 parts: History; Origin and evolution of petroleum; Migration and accumulation of petroleum; Relations of petroleum accumulation to structure; Porosity, permeability, compaction; Oil-field waters; and Subsurface temperature gradients.