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Linking core and seismic data without logs: core-seismic correlation at Site 1276

Linking core and seismic data without logs: core-seismic correlation at Site 1276
Linking core and seismic data without logs: core-seismic correlation at Site 1276
Forging a link between seismic data and the 936.9 m of core data at Ocean Drilling Program (ODP) Site 1276 is essential to understand the tectonic and sedimentary history of the wider Newfoundland Basin. Logging data traditionally bridge the gap between core and seismic data by measuring in situ geophysical properties of borehole lithologies at a scale intermediate between seismic and core data. Unfortunately, such data could not be collected at Site 1276 because of unstable hole conditions. In lieu of logging data, we employed shipboard laboratory measurements of density and velocity to create synthetic seismograms in order to tie seismic data to core data at Site 1276. The upper 800 m of sediment at Site 1276 were not cored or logged. To establish a link between the top of the cored section and two-way traveltime, we determined velocities in the upper 800 m by analyzing multichannel seismic reflection data and refined the link by comparing the reflection characteristics of seismic data and synthetic seismograms beneath 800 mbsf. We demonstrate that the prominent U reflection, which is observed throughout much of the Newfoundland Basin, is at least locally created by the shallower of two postrift igneous sills encountered at the base of Site 1276. A brighter reflection that lies beneath U is generated by the strong impedance contrast between very low-velocity, low-density sediments (interpreted as undercompacted) and the deeper postrift sill. Additionally, we describe linkages between other seismic stratigraphic horizons, such as AU, and the boundaries between primary lithologic units in Site 1276.
Texas A&M University Ocean Drilling Program
Shillington, Donna J.
e53cb591-7124-4886-88a5-1b92f65fb199
Tucholke, Brian E.
284cd485-2bca-4494-829f-2fe592df96a8
Karner, Garry D.
18176c76-5332-4e6d-839d-c1eeef2fd28c
Sawyer, Dale S.
9b2521e0-3bf5-425f-b057-995621975728
Holbrook, W. Steven
639d0174-f356-4910-a394-c46a2ccb2919
Delius, Heike
d6b921a8-a324-46db-bcf2-0652925a5de3
Tucholke, Brian E.
Sibuet, Jean-Claude
Klaus, Adam
Shillington, Donna J.
e53cb591-7124-4886-88a5-1b92f65fb199
Tucholke, Brian E.
284cd485-2bca-4494-829f-2fe592df96a8
Karner, Garry D.
18176c76-5332-4e6d-839d-c1eeef2fd28c
Sawyer, Dale S.
9b2521e0-3bf5-425f-b057-995621975728
Holbrook, W. Steven
639d0174-f356-4910-a394-c46a2ccb2919
Delius, Heike
d6b921a8-a324-46db-bcf2-0652925a5de3
Tucholke, Brian E.
Sibuet, Jean-Claude
Klaus, Adam

Shillington, Donna J., Tucholke, Brian E., Karner, Garry D., Sawyer, Dale S., Holbrook, W. Steven and Delius, Heike (2007) Linking core and seismic data without logs: core-seismic correlation at Site 1276. Tucholke, Brian E., Sibuet, Jean-Claude and Klaus, Adam (eds.) In Proceedings of the Ocean Drilling Project Scientific Results. Texas A&M University Ocean Drilling Program. 33 pp . (doi:10.2973/odp.proc.sr.210.110.2007).

Record type: Conference or Workshop Item (Paper)

Abstract

Forging a link between seismic data and the 936.9 m of core data at Ocean Drilling Program (ODP) Site 1276 is essential to understand the tectonic and sedimentary history of the wider Newfoundland Basin. Logging data traditionally bridge the gap between core and seismic data by measuring in situ geophysical properties of borehole lithologies at a scale intermediate between seismic and core data. Unfortunately, such data could not be collected at Site 1276 because of unstable hole conditions. In lieu of logging data, we employed shipboard laboratory measurements of density and velocity to create synthetic seismograms in order to tie seismic data to core data at Site 1276. The upper 800 m of sediment at Site 1276 were not cored or logged. To establish a link between the top of the cored section and two-way traveltime, we determined velocities in the upper 800 m by analyzing multichannel seismic reflection data and refined the link by comparing the reflection characteristics of seismic data and synthetic seismograms beneath 800 mbsf. We demonstrate that the prominent U reflection, which is observed throughout much of the Newfoundland Basin, is at least locally created by the shallower of two postrift igneous sills encountered at the base of Site 1276. A brighter reflection that lies beneath U is generated by the strong impedance contrast between very low-velocity, low-density sediments (interpreted as undercompacted) and the deeper postrift sill. Additionally, we describe linkages between other seismic stratigraphic horizons, such as AU, and the boundaries between primary lithologic units in Site 1276.

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Published date: 2007

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Local EPrints ID: 46702
URI: http://eprints.soton.ac.uk/id/eprint/46702
PURE UUID: 85466dd3-64a5-403b-9b14-3f5296eee35f

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Date deposited: 13 Jul 2007
Last modified: 15 Mar 2024 09:26

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Contributors

Author: Donna J. Shillington
Author: Brian E. Tucholke
Author: Garry D. Karner
Author: Dale S. Sawyer
Author: W. Steven Holbrook
Author: Heike Delius
Editor: Brian E. Tucholke
Editor: Jean-Claude Sibuet
Editor: Adam Klaus

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