Present Interpretations of the Structural Theory for Oil and Gas Migration and Accumulation
The purpose of this paper is to present a review and an analysis of the published literature relating to the migration and accumulation of oil. Some available facts bearing on this subject, heretofore unpublished, have been used in the discussion. The final object of this analysis is to crystallize from the widely divergent views of previous writers the more probable values of each explanation and thus establish a starting point for future study along this line.
Any theory advanced to account for the migration and accumulation of oil is so intimately connected with ideas of oil origin and associated problems that a large part of this paper has been devoted to a discussion of these pertinent subjects as a necessary background for the consideration of migration.
The term “structural theory” is used rather than “anticlinal theory” throughout the paper because it is a term broad enough to include the occurrence of oil on the flanks of anticlines, in lenses, and in synclines, as well as the occurrence of oil on anticlines, domes, and noses.
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.