Petroleum Geology is a complex discipline, drawing upon data from many
technologies. It is the function of Well site Geologists to integrate
processed data produced prior to and dur- ing the drilling operation
With their own geological observations. For this reason, it is necessary
that geologists appreciate some of the technology, theory of
measurement, and processing of this data in order to better assess and
use them. In the Field Geologists's Training Guide (Exlog, 1985) and Mud
Logging: Principles and Interpretations (Exlog, 1985), an introduction
is given to the scope of petroleum geology, and the techniques of
hydrocarbon (oil and gas) logging as a reservoir evaluation tool. This
handbook is intended to provide the Logging Geologist, and those
training for a Consultant Wellsite Geologist position, with a review of
geological techniques and classification systems. This will ensure the
maximum development of communicable geological informa- tion. Whether a
geologist's work lies in this direction or in the more applied field of
pressure evaluation, it is the application of geological insight to
engineering problems that distinguishes the professional logging
geologist in the field. This book will be of interest to and become a
regular reference for all geologists. 1 INTRODUCTION CUTTINGS
RECOVERY 1. 1 In an ideal borehole and mud system, cuttings would be
transported to surface with the same order and composition as they were
cut, as in Figure 1-1.