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Book Chapter

Introduction

Published:
January 01, 1990

Abstract

The characterization of naturally fractured reservoirs should include core analyses that encompass interpretation of natural and induced fractures. A definition of the term “fracture,” as we use it in this discussion, is given in Section1 of the Appendix. Unfortunately, to date, the differentiation of induced fractures from natural ones in core has been somewhat speculative and often has been based on improper techniques. Consequently, erroneous interpretations commonly have been made and useful information contained in both natural and induced fractures, as well as in other structures, often have been over looked.

This book addresses the problem of distinguishing natural fractures from induced fractures in oriented and unoriented core. Natural fractures include any cored fracture that existed in a volume of rock prior to initiation of drilling or coring-related stresses. Induced fractures in core are those that develop during drilling, coring, and subsequent handling. Many of the procedures for distinguishing between the two are based primarily on recognition of fracture surface structures and fracture traces that differ between natural fractures and induced fractures.

This book contains a minimum of theoretical text dealing with the mechanical aspects of fracture development, and concentrates instead on general descriptions and explanations of common fracture types with specific examples taken from cores. The examples highlight fractures that are encountered commonly in diverse rock types. In the Appendix we describe the term “fracture” as we use it in1this book, and include sections discussing development of fracture surface structures and use of surface structures to determine

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Contents

AAPG Methods in Exploration

Fractured Core Analysis: Interpretation, Logging, and Use of Natural and Induced Fractures in Core

B. R. Kulander
B. R. Kulander
Department of Geological Sciences Wright State University Dayton, Ohio, U.S.A.
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S. L. Dean
S. L. Dean
Department of Geology University of Toledo Toledo, Ohio, U.S.A.
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B. J. Ward, Jr.
B. J. Ward, Jr.
Amoco Production Company Research Center Tulsa, Oklahoma, U.S.A.
1
Currently with Associated Fracture Consultants, Broken Arrow, Oklahoma, U.S.A.
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American Association of Petroleum Geologists
Volume
8
ISBN electronic:
9781629811260
Publication date:
January 01, 1990

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