Three-dimensional seismic analysis of high-amplitude anomalies in the shallow subsurface of the Northern Indus Fan

Sedimentary and/or fluid origin

Gerome Calves, Mads Huuse, Anne Schwab, Peter Clift

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We report on a detailed analysis of amplitude anomalies in three-dimensional (3D) seismic reflection data and their surrounding strata in the shallow subsurface of the northern part of the Indus Submarine Fan, Arabian Sea. Our analysis reveals the presence of distributary lobe complexes and a relict fluid migration system, including a buried mud volcano, linked to contractional anticlines overlying deep-seated strike-slip faults buried below the Indus slope. Building on a regional tectonic and stratigraphic framework, we have used a 3D seismic survey to map in detail the occurrence of high-amplitude anomalies in the shallow subsurface. We link these to gas hydrate and free gas accumulations hosted within distal distributary lobes deposited on the Indus slope and supplied by underlying focused fluid flow system along a fault zone. Our results suggest that the seismic amplitude anomalies may be classified as a weak "bottom-simulating reflection'' (BSR) formed during a paleofluid flow event in the northern Indus Fan (similar to 5-1.8 Ma). Present-day fluid influx is low.

Original languageEnglish
Number of pages16
JournalJournal of Geophysical Research: Solid Earth
Volume113
Issue numberB11
Early online date15 Nov 2008
DOIs
Publication statusPublished - Nov 2008

Keywords

  • Makran accretionary prism
  • bottom-simulating reflector
  • gas-hydrate
  • Arabian Sea
  • Continental-margin
  • plate boundary
  • methane hydrate
  • Murray Ridge
  • Blake Ridge
  • heat-flow
  • Indus Fan
  • BSR
  • fluid flow

Cite this

Three-dimensional seismic analysis of high-amplitude anomalies in the shallow subsurface of the Northern Indus Fan : Sedimentary and/or fluid origin. / Calves, Gerome; Huuse, Mads; Schwab, Anne; Clift, Peter.

In: Journal of Geophysical Research: Solid Earth, Vol. 113, No. B11, 11.2008.

Research output: Contribution to journalArticle

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abstract = "We report on a detailed analysis of amplitude anomalies in three-dimensional (3D) seismic reflection data and their surrounding strata in the shallow subsurface of the northern part of the Indus Submarine Fan, Arabian Sea. Our analysis reveals the presence of distributary lobe complexes and a relict fluid migration system, including a buried mud volcano, linked to contractional anticlines overlying deep-seated strike-slip faults buried below the Indus slope. Building on a regional tectonic and stratigraphic framework, we have used a 3D seismic survey to map in detail the occurrence of high-amplitude anomalies in the shallow subsurface. We link these to gas hydrate and free gas accumulations hosted within distal distributary lobes deposited on the Indus slope and supplied by underlying focused fluid flow system along a fault zone. Our results suggest that the seismic amplitude anomalies may be classified as a weak {"}bottom-simulating reflection'' (BSR) formed during a paleofluid flow event in the northern Indus Fan (similar to 5-1.8 Ma). Present-day fluid influx is low.",
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AU - Schwab, Anne

AU - Clift, Peter

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AB - We report on a detailed analysis of amplitude anomalies in three-dimensional (3D) seismic reflection data and their surrounding strata in the shallow subsurface of the northern part of the Indus Submarine Fan, Arabian Sea. Our analysis reveals the presence of distributary lobe complexes and a relict fluid migration system, including a buried mud volcano, linked to contractional anticlines overlying deep-seated strike-slip faults buried below the Indus slope. Building on a regional tectonic and stratigraphic framework, we have used a 3D seismic survey to map in detail the occurrence of high-amplitude anomalies in the shallow subsurface. We link these to gas hydrate and free gas accumulations hosted within distal distributary lobes deposited on the Indus slope and supplied by underlying focused fluid flow system along a fault zone. Our results suggest that the seismic amplitude anomalies may be classified as a weak "bottom-simulating reflection'' (BSR) formed during a paleofluid flow event in the northern Indus Fan (similar to 5-1.8 Ma). Present-day fluid influx is low.

KW - Makran accretionary prism

KW - bottom-simulating reflector

KW - gas-hydrate

KW - Arabian Sea

KW - Continental-margin

KW - plate boundary

KW - methane hydrate

KW - Murray Ridge

KW - Blake Ridge

KW - heat-flow

KW - Indus Fan

KW - BSR

KW - fluid flow

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