本项研究探索了将典型的沿海地质压力热含水层用于两种商业目的的潜力。第一个目的是获取含水层的地热用于发电和/或直接使用，第二个目的是在不中断热量生产的情况下，利用相同的岩石体积进行安全和受控的二氧化碳封存。为了实现这些目标，我们设计并经济评估了一项计划，该计划在头4年内收回运营和资本成本，并在运营结束时产生约15%的正内部回报率。利用我们的布井和操作方案的战略设计，我们能够在数值模拟研究中获得以下结果。首先，热水生产率允许30兆瓦的Rankine发电厂循环运行20年。其次，在过去10年的运营中，我们成功地向同一储层（体积为0.8 x 109 m3）注入了约1000万吨的超临界气体。第三，几十年来对作业结束后的羽流进行的数值监测表明，在不损害盖层完整性的情况下，大量的二氧化碳被安全地封存在储层内部。
Profitability Evaluation of a Hybrid Geothermal and CO2 Sequestration Project for a Coastal Hot Saline Aquifer.
Abstract
With growing interest in commercial projects involving industrial volume CO2 sequestration, a concern about proper containment and control over the gas plume becomes particularly prominent. In this study, we explore the potential of using a typical coastal geopressured hot saline aquifer for two commercial purposes. The first purpose is to harvest geothermal heat of the aquifer for electricity generation and/or direct use and the second one is to utilize the same rock volume for safe and controlled CO2 sequestration without interruption of heat production. To achieve these goals, we devised and economically evaluated a scheme that recovers operational and capital costs within first 4 years and yields positive internal rate of return of about 15% at the end of the operations. Using our strategic design of well placement and operational scheduling, we were able to achieve in our numerical simulation study the following results. First, the hot water production rates allowed to run a 30 MW organic Rankine cycle plant for 20 years. Second, during the last 10 years of operation we managed to inject into the same reservoir (volume of 0.8 x 109 m3) approximately 10 million ton of the supercritical gas. Third, decades of numerical monitoring the plume after the end of the operations showed that this large volume of CO2 is securely sequestrated inside the reservoir without compromising the caprock integrity.
Key words: CO2 sequestration / geothermal energy / dynamic plume control / hybrid energy systems
