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首页> 外文学位 >Carbon dioxide sequestration and enhanced coalbed methane recovery in unmineable coalbeds of the Powder River Basin, Wyoming.
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Carbon dioxide sequestration and enhanced coalbed methane recovery in unmineable coalbeds of the Powder River Basin, Wyoming.

机译：怀俄明州粉河盆地不可开采的煤层中的二氧化碳封存和提高的煤层甲烷回收率。

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The first problem addressed in this thesis is global warming, where it has been shown that the amount of carbon dioxide (CO2) in the atmosphere has risen from pre-industrial levels of 280 ppm to present levels of ∼380 ppm. This increase in atmospheric CO2 is attributed to the world's expanding use of fossil fuels and is believed to be one of the primary causes of global warming.; To examine the feasibility of sequestering CO2 in unmineable coalbeds of the Powder River Basin (PRB), Wyoming, a reservoir characterization study and fluid flow simulations have been carried out. The results suggest that after 13 years of CO2 injection, ∼99% of the total CO 2 injected into the Big George coal would be sequestered (assuming the coalbed is overlain by an impermeable caprock), that methane production would be ∼5-8 times greater with CO2 injection than without, and that one injection well would be able to sequester ∼9 kt of CO2 a year.; The second issue addressed in this thesis is the disposal of coalbed methane (CBM) water, which is co-produced with CBM in the PRB. CBM water poses a serious environmental hazard to the PRB because the water has high saline and sodium contents, making it unsuitable for agricultural use and damaging to wildlife habitats. One option for the disposal of CBM water is injection into aquifers. To determine if pore pressures in aquifers are low enough to allow for significant CBM water injection and to determine whether the coals and sands are in hydraulic communication with each other, pore pressures in 250 wells that monitor water levels in coalbeds and adjacent sands within the PRB have been calculated. The analysis indicates that both sands and coalbeds have sub-hydrostatic pore pressures and that at present all sand aquifers in hydraulic communication with a producing coalbed are within ∼200 ft of the coalbed. Therefore, in order to be sure that disposed CBM water does not migrate back into producing coalbeds over time, CBM water disposal should be undertaken in sub-hydrostatic sand aquifers that are not in hydraulic communication with a coalbed.
机译：本论文解决的第一个问题是全球变暖，已表明大气中的二氧化碳（CO2）含量已从工业化前的280 ppm上升到目前的380 ppm。大气中二氧化碳的增加归因于世界范围内对化石燃料使用的增加，并且被认为是导致全球变暖的主要原因之一。为了研究在怀俄明州粉河盆地（PRB）的不可开采煤层中封存二氧化碳的可行性，已进行了储层表征研究和流体流动模拟。结果表明，注入CO2 13年后，将封存注入Big George煤的CO 2总量的约99％（假设煤层被不可渗透的盖层所覆盖），甲烷的产量约为5-8倍。注入二氧化碳比不注入二氧化碳要大得多，并且一口注油井每年可以封存约9克拉的二氧化碳。本文讨论的第二个问题是煤层气（CBM）水的处理，这是在PRB中与CBM共同生产的。煤层气水对PRB造成严重的环境危害，因为该水中的盐和钠含量很高，因此不适合用于农业用途并破坏野生动植物的栖息地。处置煤层气水的一种选择是注入含水层。为了确定含水层中的孔隙压力是否足够低，以允许大量的煤层气注水，并确定煤和砂是否彼此处于水力连通状态，需要监测250口井中的孔隙压力，以监测PRB内煤层和相邻砂中的水位已经计算了。分析表明，砂和煤层都具有亚静水孔隙压力，目前与生产中的煤层进行水力连通的所有含水层都在距煤层约200英尺以内。因此，为了确保所处置的煤层气水不会随时间迁移回到生产的煤层中，煤层气水处理应在与煤层没有水力连通的亚静水砂含水层中进行。

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