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Book Chapter

Synthetic Seismic Modeling of Turbidite Outcrops

By
Mark chapin
Mark chapin
Shell International Exploration and Production, Inc., Houston, Texas, USA
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Gottfried Tiller
Gottfried Tiller
Shell International Exploration and Production, Inc., Houston, Texas, USA
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Published:
January 01, 2008

Abstract

Seismic forward models of turbidite outcrop sections have been created to illustrate how reservoir architecture details may be expressed within the scale of resolution of commonly available, marine seismic data. These can be instructive for refining seismic interpretations and recognizing uncertainties inherent in those interpretations. Outcrop sections having sufficient length and thickness were digitized at a bed scale to generate models (Table 1). These cover a variety of sheet, channel, and mixed architecture styles.

The outcrop sections were derived from various sources (Table 1); additional outcrops are discussed in the full-length version of this paper on the CD-ROM in the back of this book (chapter 119). The sections were digitized at the finest resolution possible. This usually approximated bed scale; however, very thin, heterolithic laminae were usually lumped together as thin-bed facies. The models are relatively simple, noise-free, normal-incidence, synthetic seismograms. Velocity and density were assigned by facies and given values typical of oil-saturated sands in Gulf of Mexico Tertiary minibasin settings (Table 2). The geometries are, therefore, geologically realistic. However, in real subsurface reservoirs there is likely to be more rock property variation within facies, and also more noise in the seismic response. Shear-wave rock properties or amplitude vs. offset are not considered in the models shown here. The workflow is illustrated in Figure 1.

Testing the seismic response of a single geometry assuming different acoustic contrast and velocity can be instructive. We looked at the seismic response of outcrop sections

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Contents

AAPG Studies in Geology

Atlas of Deep-Water Outcrops

Tor H. Nilsen
Tor H. Nilsen
Desceased
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Roger D. Shew
Roger D. Shew
University of North Carolina
Wilmington, North Carolina
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Gary S. Steffens
Gary S. Steffens
Shell International E&P
Houston, Texas
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Joseph R. J. Studlick
Joseph R. J. Studlick
Maersk Oil America Inc.
Houston, Texas
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American Association of Petroleum Geologists
Volume
56
ISBN electronic:
9781629810331
Publication date:
January 01, 2008

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