首页> 外文学位 >Measurement and simulation analysis of CO2 leakage at the Crystal Geyser site and reconciliation of the mechanisms for the amount of flux from the geyser and adjacent faults.
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Measurement and simulation analysis of CO2 leakage at the Crystal Geyser site and reconciliation of the mechanisms for the amount of flux from the geyser and adjacent faults.

机译:间歇泉CO2泄漏的测量和模拟分析,以及间歇泉和邻近断层的通量变化机理的协调。

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摘要

Global warming enhanced by anthropogenic CO2 is an ever-increasing concern to scientists, policy makers, and the public at large. One plausible method of mitigating growing emissions is to inject CO2 into subsurface aquifers, which have large storage potential, thus helping diminish the accumulation of CO2 in the atmosphere. The earth stores and releases large amounts of CO2 naturally. Studying known natural sources and leaks of CO 2 can help to better understand deep-saline CO2 storage. This study focuses on the effects of barometric pressure on surface CO 2 leakage through a fault from subsurface CO2 storage. We measured the natural release of CO2 at the Little Grand Wash Fault near the Crystal Geyser, a cold-water geyser located near Green River, Utah. We observed that barometric pressure affects CO2 flux in two different manners, an immediate direct and inverse effect and a longer, 21.5-hour delayed indirect relationship.;Two one-dimensional simulation models were developed using the fluid flow equation for vertical flow. Both models simulated gaseous phase CO 2 flow from a fully saturated reservoir to the surface. The first model was run to identify a range of permeabilities that resulted in the mean observed surface flux. The second model was run to understand the indirect and time-lagged influence of barometric pressure on the CO2 fault.;The observed barometric pressure was propagated through the subsurface and directly added to or subtracted from the reservoir pressure and was able to mimic the resulting change in observed CO2 flux. Reservoir pressures included a range from minimum pressure necessary to induce flow to the surface, through hydrostatic pressure to artesian conditions established by water infiltration that recharges the CO2 reservoir from two elevations much higher than the seepage site.;Even though barometric pressure flux ranges can be accounted for in the near subsurface, the simulation results from both models imply that daily barometric pressure fluctuations do not greatly affect the leakage rates of deeply-stored CO2. Conversely, the 21.5-hour trend can be shown to directly affect the surface seepage of CO2 in a partially confined reservoir.
机译:人为CO 2加剧的全球变暖是科学家,政策制定者和广大公众日益关注的问题。减少排放物增长的一种可行方法是将CO2注入地下储层,而该储层具有很大的储藏潜力,从而有助于减少大气中CO2的积累。地球自然地存储和释放大量的二氧化碳。研究已知的自然来源和CO 2泄漏可以帮助更好地了解深盐CO2的存储。这项研究的重点是大气压力通过地下CO2储存断层对地面CO 2泄漏的影响。我们在位于犹他州格林河附近的冷泉间歇泉附近的Little Grand Wash断层测量了二氧化碳的自然释放。我们观察到大气压力以两种不同的方式影响CO2通量,即直接的直接作用和反作用,以及更长的21.5小时的延迟间接关系。;使用流体流动方程对垂直流动建立了两个一维模拟模型。两种模型都模拟了气相CO 2从完全饱和的油藏到地表的流动。运行第一个模型以识别导致平均观测表面通量的渗透率范围。运行第二个模型以了解大气压力对CO2断层的间接和时滞影响;观测到的大气压力通过地下传播并直接添加到储层压力中或从储层压力中减去,从而能够模拟最终变化观察到的二氧化碳通量。储层压力的范围包括从引导流体流入地表所需的最小压力到静水压力,再到渗水建立的自流条件,这些渗入条件使CO2储层从比渗流点高得多的两个海拔高度恢复充盈;即使大气压力通量范围可以达到考虑到在近地下的存在,两个模型的模拟结果都表明,每天的大气压波动不会对深层二氧化碳的泄漏率产生很大的影响。相反,可以显示21.5小时的趋势直接影响部分受限油藏中CO2的表面渗漏。

著录项

  • 作者

    Lyons, Richard T.;

  • 作者单位

    The University of Utah.;

  • 授予单位 The University of Utah.;
  • 学科 Civil engineering.;Environmental engineering.;Geophysics.
  • 学位 M.S.
  • 年度 2015
  • 页码 44 p.
  • 总页数 44
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:52:27

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