Published:January 01, 1985
Clays have long been of interest to man, and since the earliest times he has attempted to devise a system for their classification. The ancients regarded them as earths under the old earth-air-fire-water scheme, but their true nature was unknown until the advent of X-ray diffraction studies in the 1920's. In spite of recent advances, there is no generally accepted definition of the terms clays and clay mineral.
Figures & Tables
Clay Minerals for Peteroleum Geologists and Engineers
These notes provide a general introduction of clays for the uninitiated, plus a review of traditional and more recent concepts for those who already know something about clays. The concept of fundamental illite particles and the phenomen of interparticle diffraction, relatively new concepts that are reshaping the manner of visualizing mixed-layer clays, are discussed in some detail. A discussion of shaly-sand log analysis, from a clay mineralogy perspective, is included. Isotope geology is discussed because of its potential for permitting a better understanding of temperatures and timing of diagenesis.