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Book Chapter

Seismic Geomorphologic, Core, and Outcrop Expression of an Ordovician Paleokarst System in North-Central Tarim Basin, China

By
Hongliu Zeng
Hongliu Zeng
Bureau of Economic Geology Jackson School of Geosciences The University of Texas at Austin
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Quizhong Wang
Quizhong Wang
BGP, CNPC, China
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Bob Loucks
Bob Loucks
Bureau of Economic Geology Jackson School of Geosciences The University of Texas at Austin
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Xavier Janson
Xavier Janson
Bureau of Economic Geology Jackson School of Geosciences The University of Texas at Austin
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Yiping Xia
Yiping Xia
BGP, CNPC, China
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Ligui Xu
Ligui Xu
BGP, CNPC, China
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Published:
December 01, 2010

Abstract

Numerous paleokarst features in the Lower and Middle Ordovician limestone in north-central Tarim Basin, China, were revealed by integrating 3D interpretation and seismic geomorphologic imaging along with core description and outcrop analog. The paleokarst system was developed on the top and slope of a regional uplift beneath an Ordovician unconformity. Seismic evidence of karst development includes karsttower- and sinkhole-like features on the unconformity surface and chaotic collapse reflections and bright spots derived from cave sediments. Core observation and local Ordovician outcrop provide additional support for these interpretations. The interpreted seismic traveltime map illustrates erosional topography and seismic geomorphologic patterns on top of the unconformity for fluvial channels and canyons, fluvial valleys, sinkholes, and tower karsts and hills, revealing a matured surface drainage system related to the paleokarst system. Links between surface sinkholes and upstream river initiation and between surface channel segments and subsurface collapsed paleocaves suggest that using seismic geomorphology to predict paleocave systems is possible.

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Contents

GCSSEPM

Seismic Imaging of Depositional and Geomorphic Systems

Lesli J. Wood
Lesli J. Wood
Houston, Texas
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Toni T. Simo
Toni T. Simo
Houston, Texas
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Norman C. Rosen
Norman C. Rosen
Houston, Texas
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SEPM Society for Sedimentary Geology
Volume
30
ISBN electronic:
978-0-9836096-0-5
Publication date:
December 01, 2010

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