PREFACE 



It is the object of this symposium to acquaint the student, the practicing 

 petroleum geologist, and the petroleum engineer with the tools and techniques 

 used in the search for new oil and gas pools. The various facets of subsurface 

 exploration fall into the following broad categories: analysis of well cuttings, 

 cores, and fluids; well logging methods and interpretation; subsurface strati- 

 graphic and structural interpretation; geophysical and geochemical prospecting; 

 drilling, formation testing, and well completion ; subsurface reports ; and explora- 

 tion planning. In executing the objective of the symposium there is, of necessity, 

 some overlap into the areas of surface exploration and production engineering. 



This symposium is a logical outgrowth of Subsurface Geologic Methods 

 (1st edition, 1949; 2nd edition, 1950) compiled by L. W. LeRoy, which was 

 made possible by the support and interest of many contributors in the petroleum 

 industry. Because of rapid advances and refinements in subsurface geologic 

 methods during the past 8 years, it was deemed necessary to reorganize and 

 compile these new methods in the present volume. This volume will be sold 

 by the Publications Department of the Colorado School of Mines. 



Several of the papers that were printed in Subsurface Geologic Methods 

 have been included in the present symposium with little or no revision; other 

 papers from the former volume have been considerably revised in the light 

 of recent developments in the particular field being considered. Some subjects 

 treated in the former volume, namely those concerning mining methods and 

 "hardrock" geology, have been dropped from the present compilation because 

 of the change in primary objective. Many new subjects, not included in the 

 former volume, have been added. It is hoped that these papers will be of 

 value to geologists and petroleum engineers in the field as well as to educational 

 institutions that offer formal courses in subsurface geology and petroleum 

 geology. 



The editors wish to thank the contributors to this symposium, without 

 whose interest it would have been a much more difficult task. We would also 

 like to acknowledge gratefully the assistance received from George W. Johnson, 

 Professor of English at the Colorado School of Mines, for his many editorial 

 suggestions. Special thanks go to Roger Hull, Hendrietta Jenson, and Doris 

 Graham, of the Colorado School of Mines Publications Department, for their 

 diligent work on this volume. We wish to extend our appreciation to John W 

 Vanderwilt, President of the Colorado School of Mines, for his support of this 

 symposium. 



John D. Haun 



Colorado School of Mines 

 Golden, Colorado 

 June 1, 1958 



