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Abstract
Chapter from: M
63: Unconformities and Porosity in Carbonate Strata
Edited By
D.A. Budd, A.H. Saller, and P.M. HarrisAuthors:
Eva P. Moldovanyi, F. M. Wall, and Zhang Jun Yan Carbonate Reservoirs
Published 1995 as
part of Memoir 63
Copyright © 1995 The American Association of Petroleum
Geologists. All Rights Reserved. |
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Chapter 6
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Regional Exposure
Events and Platform Evolution of Zhujiang Formation Carbonates, Pearl River
Mouth Basin: Evidence from Primary and Diagenetic  Seismic Facies
Eva P. Moldovanyi
Amoco Production Company
Houston, Texas, U.S.A.
F. M. Wall
Amoco Norway Oil Company
Stavanger, Norway
Zhang Jun Yan
China Offshore Oil Nanhai
East Corporation
Guangzhou, People's Republic
of China
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ABSTRACT
The concept of chaotic or "diagenetic"
seismic facies is introduced as a tool for understanding factors controlling
the evolution of Miocene Zhujiang Formation carbonate platforms in the
Pearl River Mouth Basin, South China Sea. Seismic data from this basin
contain a continuum of chaotic seismic facies, which are present only within
the carbonate interval and range in appearance from simple concave-shaped
reflectors to highly irregular, high-amplitude chaotic reflectors. Diagenetic
seismic facies are significant because they are overprinted on depositional
(primary) seismic facies. The common association between chaotic seismic
facies and other features, such as truncated zones and hummocky carbonate
surfaces, supports a model involving karstification of Zhujiang Formation
carbonates.
Two contrasting stages of carbonate platform
development are recognized from seismic stratigraphic relationships within
the Zhujiang Formation interval: (1) the "lower" platform, a broad and
areally extensive low-relief ramp, and (2) the "upper" platform, a narrow
and high-relief feature. A regional episode of subaerial diagenesis separating
the two stages of platform development is inferred from the distribution
of chaotic seismic facies and from the presence on seismic of erosional
carbonate surfaces. The magnitude of sea level fluctuation is thought to
have been on the order of a few 100 m and was likely eustatically controlled.
Numerous backstepping events in the upper Zhujiang carbonate suggest this
stage of platform development
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