Seismic Chimney Formation Induced by Upward-migrating Methane in the Nordland Group, Southern Viking Graben

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• 作者：Thomas Kempka^a ; ^{kempka@gfz-potsdam.de} ; Victoria Unger^a ; ^b ; Michael K&uuml ; hn^a ; ^b
• 关键词：Viking Graben ; Nordland Group ; seismic chimneys ; fluid leakage ; hydromechanical simulation
• 刊名：Energy Procedia
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：97
• 期：Complete
• 页码：427-432
• 全文大小：313 K
• 卷排序：97

文摘

The Nordland Group in the Southern Viking Graben hosts seismic chimneys, represented by anomalies in seismic data and resid- ual methane accumulations. These anomalies are generally interpreted as focused fluid flow structures, and thus pose the risk of potential fluid leakage by geological subsurface utilization. Our aim was to assess if excess pore pressure, resulting from buoy- ancy effects due to upward-migrating methane in the Utsira Formation may be responsible for formation of these anomalies. Our hydromechanical simulation results demonstrate that tensile failure in the Nordland Group already occurs before the maximum methane column heights develop in the Utsira Formation below.