Three-dimensional seismic investigations of the Sevastopol mud volcano in correlation to gas/fluid migration pathways and indications for gas hydrate occurrences in the Sorokin Trough (Black Sea)

Wagner-Friedrichs, M., Krastel, Sebastian, Spiess, V., Ivanov, M., Bohrmann, Gerhard and Meisner, L. (2008) Three-dimensional seismic investigations of the Sevastopol mud volcano in correlation to gas/fluid migration pathways and indications for gas hydrate occurrences in the Sorokin Trough (Black Sea) Geochemistry Geophysics Geosystems, 9 (Q05012). DOI 10.1029/2007GC001685.

[img]
Preview
Text
139_Wagner-Friedrichs_2008_3dSeismicInvestigationsOfThe_Artzeit_pubid9597.pdf - Published Version

Download (8Mb)

Supplementary data:

Abstract

New 3-D seismic investigations carried out across the Sevastopol mud volcano in the Sorokin Trough present 3-D seismic data of a mud volcano in the Black Sea for the first time. The studies allow us to image the complex three-dimensional morphology of a collapse structured mud volcano and to propose an evolution model. The Sevastopol mud volcano is located above a buried diapiric structure with two ridges and controlled by fluid migration along a deep fault system, which developed during the growth of the diapirs in a compressional tectonic system. Overpressured fluids initiated an explosive eruption generating the collapse depression of the Sevastopol mud volcano. Several cones were formed within the depression by subsequent quiet mud extrusions. Although gas hydrates have been recovered at various mud volcanoes in the Sorokin Trough, no gas hydrates were sampled at the Sevastopol mud volcano. A BSR (bottom-simulating reflector) is missing in the seismic data; however, high-amplitude reflections (bright spots) observed above the diapiric ridge near the mud volcano at a relatively constant depth correspond to the approximate depth of the base of the gas hydrate stability zone (BGHSZ). Thus we suggest that gas hydrates are present locally where gas/fluid flow occurs related to mud volcanism, i.e., above the diapir and close to the feeder channel of the mud volcano. Depth variations of the bright spots of up to 200 ms TWT might be caused by temperature variations produced by variable fluid flow.

Document Type: Article
Keywords: mud volcanoes; gas hydrates; fluid migration; Black Sea; 3-D seismic
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-JRG-B4 Submarine Hazards
Refereed: Yes
DOI etc.: 10.1029/2007GC001685
ISSN: 1525-2027
Projects: MARGASCH
Expeditions/Models:
Date Deposited: 12 Oct 2010 08:52
Last Modified: 08 Mar 2018 07:20
URI: http://eprints.uni-kiel.de/id/eprint/9166

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...