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Book Chapter

Introduction

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Published:
January 01, 1980

Abstract

A cursory look at a continuous velocity log (CVL) provides sufficient evidence that hydrocarbons and other natural resources are certainly not deposited in simple geologic environments consisting of only a few homogeneous sedimentary layers bounded by first-order interfaces. Rather, resources typically are found within highly stratified layers which can be folded or faulted and can wedge out in various directions or be in unconformable contact with other subsurface masses. In addition, the various properties affecting seismic wave propagation within the earth may often change laterally within layers.

The true geology in all details can never be completely recovered from seismic reflections. Rather, one ought to aim for the recovery of a suitable subsurface model that provides all desired information related to expected resources and is reasonably consistent with other available surface or borehole measurements. In the past, models were greatly simplified. In the future they will become more complex, and one can expect them to provide a more equitable balance between theory and observation.

Deriving an accurate subsurface model from surface measurements, i.e., solving the inverse problem, is certainly no simple task. The process is particularly difficult where the geology (and, hence, the seismic trace) is complicated. Therefore, it is not surprising that many complementary methods have evolved which all aim for inverse solutions: estimates of images of the subsurface.

Various seismic waves are generated and recorded in response to a near-surface explosion. Some arise in close sequences of layers (short peg-leg multiples) or are generated at faults, discontinuities, strong

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Contents

Interval Velocities from Seismic Reflection Time Measurements

Peter Hubral
Peter Hubral
Bundesanstalt fiir Geowissenschaften und Rohstoffe Rohstoffe Hannover, West Germany
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Theodor Krey
Theodor Krey
Consultant Prakla-Seismos Hannover, West Germany
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L.Larner Kenneth
L.Larner Kenneth
Western Geophysical Company Houston, Texas
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Society of Exploration Geophysicists
ISBN electronic:
9781560802501
Publication date:
January 01, 1980

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