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Chapter 16: Development of an Exploration Concept for the Shuaiba Formation Using Seismic Sequence and Facies Analysis with Forward Modeling

By
K. C. Fischer
K. C. Fischer
Schlumberger GeoQuest, Hannover, Germany
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R. Marschall
R. Marschall
Schlumberger Geco-Prakla, Hannover, Germany
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U. Möller
U. Möller
Schlumberger GeoQuest, Hannover, Germany
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Published:
January 01, 1997

Abstract

The Lower Cretaceous Shuaiba Formation, along with its Bab Member (upper Thamama Group, Aptian), is one of the most important hydrocarbon reservoirs in Abu Dhabi. It is unconformably overlain by the shales of the Nahr Umr Formation in the Wasia Group, which form the regional seal. The Shuaiba Formation represents a shelf carbonate sequence deposited in a shallow marine environment, with several lithologic units comprising lateral and vertical variations in reservoir development. The remaining potential of the Shuaiba Formation is likely to be restricted to combined structural-stratigraphic or stratigraphic traps.

In development of an exploration concept and evaluation of the prospect potential, seismic sequence and facies analysis is an important and necessary tool. Seismic stratigraphic interpretation of the Shuaiba Formation, along with core descriptions, results in a detailed lithologic model (grid size 2 m x 2 m) that is verified by forward modeling (verification loop). Here 3-D techniques can also be applied, especially 3-D amplitude versus offset (AVO). At a later stage (during ongoing production), 4-D seismics (front tracking) can be applied to optimize hydrocarbon production. Modern techniques such as horizontal drilling especially benefit from the detailed reservoir knowledge obtainable in this manner.

Low relief structures in the area are sensitive to lateral velocity variations caused by lithologic variations in the overburden; time-depth conversion should thus be verified using the wavefront method.

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Contents

Geophysical Developments Series

Carbonate Seismology

Ibrahim Palaz
Ibrahim Palaz
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Kurt J. Marfurt
Kurt J. Marfurt
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Society of Exploration Geophysicists
Volume
6
ISBN electronic:
9781560802099
Publication date:
January 01, 1997

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