About This Item
- Full TextFull Text(subscription required)
- Pay-Per-View PurchasePay-Per-View
Purchase Options Explain
Share This Item
The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
DOI:10.1306/03111110136
Three-dimensional
seismic
geomorphology and analysis of the Ordovician paleokarst drainage system in the central Tabei Uplift, northern Tarim Basin, western China
![Previous Hit](/data/images/arrow_left.gif)
![Next Hit](/data/images/arrow_right.gif)
Hongliu Zeng,1 Robert Loucks,2 Xavier Janson,3 Guizhong Wang,4 Yiping Xia,5 Bingheng Yuan,6 Ligui Xu7
1Bureau of Economic Geology, The University of Texas at Austin, University Station, Box X, Austin, Texas 78713; [email protected]
2Bureau of Economic Geology, The University of Texas at Austin, University Station, Box X, Austin, Texas 78713; [email protected]
3Bureau of Economic Geology, The University of Texas at Austin, University Station, Box X, Austin, Texas 78713; [email protected]
4BGP of CNPC, 189 Fan Yang Xi Lu, Zhuozhou City, Hebei Province, China; [email protected]
5BGP of CNPC, 189 Fan Yang Xi Lu, Zhuozhou City, Hebei Province, China; [email protected]
6BGP of CNPC, 189 Fan Yang Xi Lu, Zhuozhou City, Hebei Province, China; [email protected]
7BGP of CNPC, 189 Fan Yang Xi Lu, Zhuozhou City, Hebei Province, China; [email protected]
ABSTRACT
High-quality three-dimensional seismic
data acquired in the central Tabei Uplift, Tarim Basin, western China, provide a rare opportunity to characterize in exceptional detail the three-dimensional geomorphology of a deeply buried (5500–6500 m [18,045–21,325 ft]) Ordovician unconformity and the related paleokarst drainage system. An integrated approach was applied that emphasized integration of
seismic
data with available conventional core, wireline logs, and age-equivalent outcrops. The exceptional quality of the
seismic
data allowed a
seismic
detection limit of karstified features of less than 75
75 m (246
246 ft) horizontally and 6 m (20 ft) vertically.
Interpreted geomorphologic and depositional elements include fluvial channels and canyons, fluvial valleys, sinkholes, and tower karsts and hills. The modern tower karst-drainage system in Guilin, China, is very similar to the mapped Ordovician karst-drainage system and is used as a modern analog. The interaction between the surface karst-drainage system and the shallow-subsurface cave-passage system is evidenced by the observation that surface canyons appear to initiate in areas associated with intense sinkhole development. Also, surface river valleys tend to correspond to dip-oriented surface depressions partly related to near-surface cave collapse. During burial into the deeper subsurface, the combination of intrastratal collapse (karstified strata) and suprastratal collapse (postkarst-deposited strata) created large damage zones hundreds of meters thick and kilometers wide. Coalesced-collapsed paleocave systems can be interpreted from the unique circular pattern of faults (observed in map view) that are associated with seismic
bright spots.
Pay-Per-View Purchase Options
The article is available through a document delivery service. Explain these Purchase Options.
Watermarked PDF Document: $14 | |
Open PDF Document: $24 |
AAPG Member?
Please login with your Member username and password.
Members of AAPG receive access to the full AAPG Bulletin Archives as part of their membership. For more information, contact the AAPG Membership Department at [email protected].