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Seismic characterization of fluid migration and Pockmarks in the Estremadura Spur, West Iberian Margin, Portugal

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Title
Seismic characterization of fluid migration and Pockmarks in the Estremadura Spur, West Iberian Margin, Portugal
Other Titles
포르투갈 서쪽 이베리아 마진, 에스트레마두라스퍼에서의 유체이동 및 폭마크의 사이스믹 특성
Authors
Debora Duarte
Henrique Duarte
Kim, Jung-Hyun
Omar Benazzouz
Luis Menezes Pinheiro
Pedro Madureira
Carlos Ribeiro
Pedro Terrinha
Vitor Hugo Magalhaes
Keywords
West Iberian Margin; pockmarks
Issue Date
2017
Citation
Debora Duarte, et al. 2017. Seismic characterization of fluid migration and Pockmarks in the Estremadura Spur, West Iberian Margin, Portugal. European Geosciences Union General Assembly 2017. Vienna. 2017.04.23~2017.04.28.
Abstract
The analysis of the seismic profiles allowed the identification of six seismic units, disturbed by the migration and accumulation of fluids. The Estremadura Spur outer shelf has been affected by several episodes of fluid migration and fluid escape during the Pliocene-Quaternary that are expressed by a vast number of seabed and buried pockmarks. At present, the pockmarks are mainly inactive, as the seabed pockmarks are covered by recent sediments. The stacking of various pockmarks suggests a cyclical fluid flow activity that can possibly be the result of the eustatic sea level variations and the subsequent changes of the hydrostatic pressure. The origin of the seep fluids is still under debate but considering the low-sedimentation rate of the area and the low productivity a deep source for the fluids is most probable, possibly related with the Jurassic hydrocarbon system. It was concluded that the migration of fluids to the seabed occurred over the Pliocene-Quaternary in several episodes, as indicated by the buried pockmarks at different depths.
URI
http://repository.kopri.re.kr/handle/201206/8289
Conference Name
European Geosciences Union General Assembly 2017
Conference Place
Vienna
Conference Date
2017.04.23~2017.04.28
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