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Book Chapter

Seismic Recognition of Depositional Facies on Slopes and Rises

By
P. R. Vail
P. R. Vail
Exxon Production Research Co. Houston, Texas
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Published:
January 01, 1977

Abstract

The depositional facies on slopes and rises depend in large part on the tectonic processes and sea level changes, as well as rate and type of sediment supply. Seismic examples of slope and rise depositional facies from divergent, convergent, and strike-slip continental margins are presented and discussed in terms of sea level changes and sediment supply.

Seismic sequence and seismic facies analyses are effective methods for recognition of depositional facies on slopes and rises and studying the interrelationships between tectonic processes, sea level changes, and sediment supply. Seismic sequence analysis is based on the identification of stratigraphic units composed of a relatively conformable succession of genetically related strata termed depositional sequences, Fig. 1. The upper and lower boundaries of depositional sequences are unconformities or their correlative conformities. The time interval represented by strata of a given sequence may differ from place to place, but the range is confined to synchronous limits marked by ages of the sequence boundaries where they become conformities. Depositional sequence boundaries are recognized on seismic data by identifying reflections caused by lateral terminations of strata termed onlap, downlap, toplap, and truncation, Fig. 1. The depositional sequences, because they consist of genetically related strata having Chronographic significance, provide an ideal stratigraphic interval for seismic facies analysis. Seismic facies analysis is the deliniation and interpretation of reflection geometry, continuity, amplitude, frequence, and interval velocity, as well as the external form and associations of seismic facies units. Once the seismic facies parameters are described and mapped, an interpretation of

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Contents

AAPG Continuing Education Course Notes Series

Geology of Continental Margins

Joseph R. Curray
Joseph R. Curray
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William R. Dickinson
William R. Dickinson
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Wallace G. Dow
Wallace G. Dow
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Kenneth O. Emery
Kenneth O. Emery
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Donald R. Seely
Donald R. Seely
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Peter R. Vail
Peter R. Vail
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Hunter Yarborough
Hunter Yarborough
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American Association of Petroleum Geologists
Volume
5
ISBN electronic:
9781629812021
Publication date:
January 01, 1977

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