The rapid accumulation of data, mainly from field observations and oceanographic research in the past few years, has forced the conclusion that turbidites are not freaks of nature but are very commonplace, especially in environments of deep-water sedimentation. Billions of barrels of oil have been produced from turbidites in the Los Angeles basin alone. A thorough knowledge of their characteristic features and mode of origin would be of great use in petroleum exploration and development in areas where turbidites exist. By virtue of their mode of deposition, turbidites have peculiar syngenetic structures which serve as useful recognition clues and as indicators of current direction and sea-bottom topography. Much more data collecting is necessary before these potential clues can be fully utilized in predicting shape, size, and trend of turbidites from isolated well data, but the possibilities are enormous. Turbidites are deposited in low places on the sea floor, and their over-all geometry is controlled by the shape of these low places. Channel, fan, and blanket-like shapes have been observed. Descriptions in the literature of entire turbidites, showing their complete geometry, are lacking, but four incomplete or generalized examples are given from the California Tertiary.
Figures & Tables
Geometry of Sandstone Bodies
This volume contains the eight papers presented as a symposium of the Research Committee of The American Association of Petroleum Geologists at the 1960 annual meeting in Atlantic City, New Jersey. One paper presented in the General Session at that meeting, one reprinted paper, and three other solicited papers are also included.
The choice of “Geometry of Sandstone Bodies” as a timely and pertinent subject lor the 1960 symposium was made after an extensive canvass of Research Committee members and about fifty other geologists vitally interested in research in petroleum geology. From a group of about 15 proposed subjects, this one was selected as first choice by almost all those canvassed. Partly because of this high level of interest, the decision was made to attempt publication of the symposium as a special volume of The American Association of Petroleum Geologists. The word geometry in the title probably had several different meanings among the selectors, and for this reason an attempt was made to define the term adequately in order to establish uniformity of communication among symposium participants.
The dictionary definition of the word “geometry” is the science of magnitudes in space. In applying the term to the symposium theme, some modification and interpretation of its formal meaning were needed, and the following definition was therefore proposed for use in this volume—
Geometry of Sandstone Bodies—Spatial relationships of sandstone deposits within the sedimentary framework.
As used in this book, the subject is more than just a three-dimensional study in which thickness is added to areal distribution.