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首页> 外文会议>International Symposium on Advances in Isotope Hydrology and its Role in Sustainable Water Resources Management;IHS-2007 >APPLICATION OF STABLE ISOTOPES ANDFLUID CHEMISTRY TO UNDERSTANDINGANTHROPOGENIC CO2 -BRINE-ROCKINTERACTIONS IN SEDIMENTARY BASINS:RESULTS FROM THE FRIO BRINE PILOT TESTS,TEXAS, USA
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APPLICATION OF STABLE ISOTOPES ANDFLUID CHEMISTRY TO UNDERSTANDINGANTHROPOGENIC CO2 -BRINE-ROCKINTERACTIONS IN SEDIMENTARY BASINS:RESULTS FROM THE FRIO BRINE PILOT TESTS,TEXAS, USA

机译：稳定同位素和流体化学在认识盆地中人为致密的CO2-岩石-岩石相互作用中的应用：美国得克萨斯州的FRIO BRINE PILOT TESTS的结果

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To investigate the potential for the long-term storage of CO2 in deep saline aquifersin sedimentary basins, 1600 t of CO2 were injected at 1500 m depth into a 24-m-thick “C”sandstone section of the Frio Formation, a regional aquifer in the U.S. Gulf Coast. Stableisotopes of water, gases and solutes proved powerful tools in mapping the distribution,transport and interactions of the injected CO2 , and in tracking its leakage into the localshallow groundwater, and into the overlying Frio “B” sandstone, separated from the“C” by ～15 m of shale and siltstone. Fluid samples obtained from the “C” before CO2injection showed a Na-Ca-Cl type brine with ～93,000 mg/L TDS at saturation with CH 4 ,but only 0.3% CO2 . Following CO2 breakthrough, samples showed sharp drops in pH,pronounced increases in alkalinity, Ca, Fe and Mn, and significant shifts in the isotopiccompositions of H2O, CH 4 , DIC, and Sr. Gas and isotopic signatures coupled withperfluorocarbon tracers demonstrated significant CO2 migration into the “B” sandstone.Results obtained to date from four shallow monitoring groundwater wells show nobrine or CO2 leakage through the Anahuac Formation, the regional cap rock. The δ18Ovalues for brine and DIC, used to calculate brine/CO2 ratios in the reservoir, gave resultscomparable to those obtained by geophysical methods.
机译：为了探讨深盐水上沉积盆中的CO2长期储存的可能性，将1600吨CO2注射1500米深度进入FRIO形成的24米厚的“C”砂岩部分，是一种区域含水层美国湾海岸。水，气体和溶质的稳定性，证明了绘制了注射二氧化碳的分布，运输和相互作用，以及将其泄漏追踪到基地霍尔的地下水中，并进入覆盖的FRIO“B”砂岩，与“C”分开〜15米的页岩和粉砂岩。在CO 2投影之前从“C”获得的流体样品显示Na-Ca-Cl型盐水，其饱和在饱和〜93,000mg / L TDS，饱和CH 4，但仅为0.3％CO 2。在二氧化碳突破之后，样品在pH下急剧下降，碱度，Ca，Fe和Mn的显着增加，以及H2O，CH 4，DIC和Sr的同位素置位的显着变化。燃气和同位素签名与PerforoCarbon示踪剂相连，表现出显着的二氧化碳迁移进入“B”砂岩。迄今为止从四个浅监测地下水井上获得的结果，通过Anahuac形成，区域帽岩体显示Nober或CO2泄漏。用于计算储存器中的盐水/二氧化碳比的盐水和DIC的δ18级，对通过地球物理方法获得的盐水/二氧化碳比率产生了不可分割的。

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