Geological Well Logs: Their Use in Reservoir Modeling

by S. Luthi

Overview

When I joined Schlumberger in 1982 I was surprised to find very few geologists in the company, and the few there were worked more as log analysts than geol­ ogists. The reason for this became soon clear to me: Except for the dipmeter there was no tool, and no other service, that was considered "geological". Schlumber­ ger geologists were supposed to work with dipmeters, and, if they had a taste for it, the natural gamma-ray spectroscopy logs. It turned out that my timing was fortunate. At Schlumberger's research center, in Ridgefield, Connecticut, a prototype electrical imaging tool had been designed, and after having spent three years in the Middle East I was transferred there. The first field test results were just coming in, and the images were startling. We could see geological details that nobody had ever seen from a log: cross-beds, unconformities, pebbles, fractures, folds, faults. No cores were needed to confirm the reality of these data; they were too real to be artifacts.

Product Details

ISBN-13:	9783540678403
Publisher:	Springer Berlin Heidelberg
Publication date:	05/11/2001
Edition description:	2001
Pages:	373
Product dimensions:	6.10(w) x 9.25(h) x 0.03(d)

Table of Contents

1 Introduction.- 1.1 Overview.- 1.2 A Brief History of Logging.- 1.3 The Petrophysical Approach.- 2 Geological Measurements.- 2.1 Dipmeter.- 2.2 Electrical Borehole Imaging.- 2.3 Acoustic Borehole Imaging.- 2.4 Density Borehole Imaging.- 2.5 Optical Borehole Imaging.- 2.6 Nuclear Magnetic Resonance Logging.- 2.7 Nuclear Spectroscopy Logging.- 2.8 Paleomagnetic Logging.- 2.9 Core Sampling.- 3 Applications and Case Studies.- 3.1 Structural Modeling.- 3.2 Bedding and Reservoir Zonation.- 3.3 Fractured Reservoirs.- 3.4 Well Correlation.- 3.5 Geological Drilling.- Conclusions.- Figure Credits.- Abbreviation Index.