利用震測方法探討台中至彰化外海的二氧化碳地質封存潛能; Potential Geological Storage of Carbon Dioxide in the Offshore Area between Taichung and Changhwa Investigated from Seismic Analysis

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题名:	利用震測方法探討台中至彰化外海的二氧化碳地質封存潛能;Potential Geological Storage of Carbon Dioxide in the Offshore Area between Taichung and Changhwa Investigated from Seismic Analysis
作者:	陳揚琛;Yang-Chen Chen
贡献者:	地球物理研究所
关键词:	二氧化碳;地質封存;封存場址;封存潛能;震測;storage site;potential storage capacity;seismic;carbon dioxide;geological storage
日期:	2011-08-27
上传时间:	2012-01-05 14:13:34 (UTC+8)
摘要:	二氧化碳地質封存是將大氣層中的二氧化碳溫室氣體降低最有效和最直接的方法之一。本研究使用反射震測和鑽井資料，探討二氧化碳地質封存合適的場址，並初步評估二氧化碳可封存之潛能。台中至彰化外海區域，有可成為二氧化碳良好儲集層的桂竹林層和南莊層，厚度約50至400公尺，深度分布在700至2800公尺之間，儲集層上覆可成為良好區域性蓋層的錦水頁岩。研究區域內地層受造山帶荷重影響向東和向北傾斜加深，二氧化碳封存後會沿著深部地層往台灣海峽的方向(西方)移棲。研究區域內的斷層主要分布在觀音山砂岩以下的地層，無明顯活動構造，對二氧化碳封存而言是一個合適的場址。唯獨要注意的是研究區域東部可能有南北走向的裂隙存在，是否會對二氧化碳封存造成影響必須再觀察與研究，若證實並無構造存在，那本研究區域無疑是二氧化碳封存一個良好的場址選擇。本研究使用Tanaka et al. (1995)及美國能源部(2007)所提出的二氧化碳於鹽水層封存量之估算方法，並利用蒙地卡羅模擬法，計算出有包含錦水頁岩的台中至彰化外海區域之二氧化碳地質封存潛能，此兩方法得出的二氧化碳封存量分別可能為5.9億噸和6.4億噸。 Geological storage of carbon dioxide is the one of most effect and direct method to reduce carbon dioxide (CO2) in the atmosphere. This study reports the use of reflection seismic and well-log data to investigate possible and suitable storage sites of CO2 and to estimate potential storage capacity of CO2. In the offshore area between Taichung and Changhwa, Nanchuang Formation and Kueichulin Formation are good CO2 reservoirs as they contain multiple layers of sandstones (around 50-400 meters thick) with their formation top lying at depth 700-2800 meters. Those porous sandstones are capped by Chinshui Shale. All the stratigraphic units deepen toward the east and the north due to orogenic loading in the study area. The injected CO2 will migrate toward the Taiwan Strait in the west along the deeper CO2 reservoir. Because faults mostly occur within the sequences below Kuanyinshan Sandstone and there are less active structures in the study area, this area will be a suitable CO2 storage site. However, there probably is an N-S fracture in the eastern part of the study area. We should observe and take notice of the fracture more. If it doesn’t exist, this region is a good choice to store CO2 certainly. This study use the method that suggested by Tanaka et al. (1995) and USDOE (2007) to estimate potential geological storage of CO2 in the offshore area between Taichung and Changhwa. The CO2 storage capacity in this region including the area with Chinshui Shale is around 590 and 640 megatons as estimated by Monte Carlo simulation, individually.
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