Emission Flux of CO2 through an Active Fault Zone and Estimation of CO2 Reservoir in SW Taiwan
Date Issued
2009
Date
2009
Author(s)
Cheng, Chun-Yuan
Abstract
CO2 is well-known as a greenhouse gas, which is identified as a species affecting the Earth climate. CO2 could account for more than 60% of all greenhouse gas generated globally. Although CO2 is very important to the climate system, its nature flux at fault zone was seldom quantified. Therefore, systematic estimation of the nature CO2 emission is important to better understand the global emission amount of natural greenhouse gases and to compare with the amount of anthropogenic emission. o cope with global warming, CO2 geological storage is identified as an effective method to cut down CO2 concentration in atmosphere. However, the understanding of CO2 behavior in the reservoir is still rare. To understand the behavior of CO2 in the reservoir, study the natural analogue is a proper method to increase the understanding of CO2 reservoir in geological timescale. Therefore, we will choose the active fault zone area in SW Taiwan to systematically study the soil CO2 flux and estimate the gas reservoir in study area.hunglun mud pool is located in the southwest Taiwan and is cut by the active Chukuo Fault. The main component of its bubbling gas is CO2 (>75%) with minor CH4 (10%). The CO2 is considered to be the eruption products of Miocene magmatism in West Taiwan and might be stored in the reservoir and started degassing due to recent fault activity. general survey of soil CO2 flux and soil gas composition along the fault zone was conducted using the closed chamber method. Meanwhile, a continuous monitoring system was setup to record the gas flow at Chunglun mud pool, using a big funnel (1m x 1m) to cover the bubbling gas of the mud pool.he average CO2 flux from mud pool is ca. 114 t/yr. Considered the CO2 flux and the activity of the fault, more than 900 Mt CO2 could be stored in the reservoir.he results show that the soil CO2 emission from the fault zone and near the mud pool is ca. 17 and 29 g/m2/day, respectively. Meanwhile, the CO2 flux in background area is ca. 7 g/m2/day. It reveals that active fault zone, at least in study area, exhibits relatively high CO2 efflux. The results of soil gas survey show that the soil CO2 concentration is closely related to its 13C value. Therefore, the soil CO2 in active fault zone of SW Taiwan is considered as the mixture of different components from deep and shallow CO2 sources.aiwan can be divided into several domains to estimate the amount of natural CO2 emission. An overestimated value of soil CO2 emission in Taiwan can be obtained ca. 132 Mt/yr. Although it is an overestimated value, it is still much less than the anthropogenic CO2 amount in Taiwan (ca. 253 Mt/yr) and the value could be up to 366 Mt/yr in 2010 (APEC, 2005).
Subjects
CO2 Flux
Natural Reservoir
Active Fault Zone
SDGs
Type
thesis
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