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Eustasy Recording Potential of an Isolated Devonian to Pennsylvanian Carbonate Platform in a Foreland Basin Setting (Tengiz, Pricaspian Basin, Kazakhstan)*
By
J.A.M. Kenter1 and P.M. Harris2
Search and Discovery Article #20047 (2008)
Posted May 20, 2008
*Abstract prepared for oral presentation at AAPG Annual Convention, San Antonio, Texas, April 20-23, 2008.
1 ETC, Chevron, Voorburg, Netherlands ([email protected])
2 ETC, Chevron, San Ramon, CA, USA ([email protected])
Abstract
Research drilling of continental margins over the last decade has validated a significant number, as well as the timing, of EPR sea-level events for the past 100 My. However, for the older geological record diverging sea level estimates (EPR curve, continental flooding records, planktic evolutionary records) still exist and the extraction of reliable eustatic records remains problematic.
Tengiz field is an isolated carbonate buildup in the southeastern Pricaspian Basin, containing a complete Late Famennian to Early Bashkirian platform succession that was deposited in a relatively stable but rapidly subsiding foreland basin setting facing a thrust belt to the south. Since the Famennian, the platform aggraded and periodically back-stepped, resulting in approximately 1400 m (4480 ft) of relief above the Famennian platform, followed by up to 2 km (1.2 miles) of Serpukhovian progradation. Vertical trends in relative shoaling and deepening, recorded exposure and/or erosional events, and biostratigraphy provide a relative sea level record of punctuated sea level falls and rises that is made up of 2nd and 3rd order sequences which are superimposed by higher (4-5th order) frequency platform cycles.
Though several of the observed sea level lowstands correspond to 3rd order eustatic sequences on the EPR curve, the influence of rapid changes in the paleobathymetry of the foreland basin, which caused significant thickening of sequences and drowning in the Late Devonian elsewhere in the basin, appears to have a strong influence on the regional sequence stratigraphic framework. This article addresses the interplay between subsidence and recorded sequences in such foreland basin settings.
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Paleozoic Carbonates in Foreland Basin Settings: Northern Pricaspian Basin (Kazakhstan) and Cantabrian Zone (Spain)*
By
J.A.M. Kenter1 and P.M. Harris2
With contributions by Oscar Merino-Tomé, Juan Bahamonde, Juan Colmenero, Tom Heidrick, and Kairat Jazbayev
Search and Discovery Article #20047 (2008)
Posted May 20, 2008
*Adapted from oral presentation at AAPG Annual Convention, San Antonio, Texas, April 20-23, 2008.
1 ETC, Chevron, Voorburg, Netherlands ([email protected])
2 ETC, Chevron, San Ramon, CA, USA ([email protected])
- Rationale
- Carbonate systems in foreland basin settings
- Tectonic setting Pricaspian Basin
- Tengiz Field accommodation history
- Outcrop analog from northern Spain: platforms and thrust-top buildups in a foreland basin setting
- Conclusions
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North Caspian Basin--Background
Cantabrian Zone: Marine Foreland Basin
Bosence, D.W.J., 2005, A new, genetic classification of carbonate platforms based on their basinal and tectonic setting in the Cenozoic: Sedimentary Geology, v. 175, p. 49-72.
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