臺灣西南海域上部高屏斜坡之泥貫入體與活躍泥火山的分布及油氣潛能

Distribution of Mud Diapirs and Active Mud Volcanoes, and Natural Gas Potential in the Upper Kaoping Slope, Offshore Southwest Taiwan

陳松春(S. C. Chen) ； 許樹坤(S. K. Hsu) ； 王詠絢(Y. Wang) ； 劉家瑄(C. S. Liu)

《鑛冶：中國鑛冶工程學會會刊》 58卷2期 (2014/06) Pp. 30-49

https://doi.org/10.30069/MM.201406_58(2).0003

摘要

臺灣西南海域上部高屏斜坡是位於增積岩楔區，有許多泥貫入體構造及泥火山分布。為了進一步了解泥貫入體與泥火山的分布及特性，我們整合分析了震測、多音束水深、無人遙控載具（ROV）觀測、側掃聲納及地化分析等資料。經分析結果，辨識出10處呈線性分布之泥貫入體構造，走向約NNE-SSW至N-S，以及13處泥火山。泥火山位於泥貫入體上方，顯示泥火山和泥貫入體的發育相關。從ROV觀測及側掃聲納資料，顯示泥火山是相當活躍的噴發；另外，泥火山上部的海水呈現高甲烷濃度，顯示泥火山的噴發伴隨有豐富的甲烷氣流體。我們推測在這泥貫入體及泥火山區有相當高的油氣潛能。

關鍵字

泥貫入體 ； 泥火山 ； 無人遙控載具 ； 側掃聲納

並列摘要

There are scattered diapiric structures and mud volcanoes in upper Kaoping Slope, offshore SW Taiwan located in an accretionary wedge setting. In order to better understand the distribution and characters of the mud diapirs and mud volcanoes, we integrated the MCS data, multibeam bathymetry, ROV observations, sidescan sonar and geochemical investigations. We found ten quasi-linear mud diapirs (oriented NNE-SSW to N-S directions) and thirteen mud volcanoes. The mud volcanoes are situated on tops of the mud diapirs implying that the formation of the mud volcanoes is directly associated with the mud diapirs. The mud volcano eruptions are very active as shown by ROV observations and sidescan sonar investigations. The water column above the mud volcanoes have a high methane concentration indicating that the eruptions are accompanied by methane-rich fluid discharge. This may suggest that the mud diapir and mud volcanoe area has a high natural gas potential.

並列關鍵字

mud diapir ； mud volcano ； ROV ； sidescan sonar