In this paper, the feasibility of power generation from an enhanced geothermal system (EGS) located beneath an oilfield at the Bongor basin in Chad was examined through the analysis of numerical simulation parameters. A 3D geometric model is constructed to represent the proposed EGS and a thermo-hydro-mechanical (THM) coupled mathematical model was used in the simulation process to link all inter-dependent parameters of heat mining. Oilfield warm water is anticipated to be the circulating fluid of the thermal reservoir due to its ready availability from high water-cut oil wells. Chad depends heavily on a diesel power plant, thus this work further proposes the utilization of carbon dioxide (CO₂) from the power plants to be used as heat mining fluid and likely CO₂ sequestration into deep granite formation. The results indicate that the implementation of EGS beneath the current oilfield would have significant advantages both technically, environmentally, and economically. Oilfield produced water at warm temperatures improved heat mining efficiency and utilization of oilfield water in geothermal wells will reduce costs involved in water treatment and disposal. The geothermal gradient is sufficient to produce water at a higher temperature that can be utilized commercially by different binary power plants. Utilizing CO₂ as heat extraction fluid showed significant heat extraction, higher than using oilfield produced water. Furthermore, substantial amount of CO₂ can be deposited into the formation, thus reducing emission of greenhouse gasses to the atmosphere.

本文通过数值模拟参数分析，研究了位于乍得邦戈盆地一个油田下方的增强型地热系统（EGS）发电的可行性。构建了一个3D几何模型来表示所提出的EGS，并且在仿真过程中使用了热-水力-机械（THM）耦合的数学模型来链接热量开采的所有相互依赖的参数。由于可以从高含水率的油井中随时获得热量，因此油田热水有望成为储层的循环流体。乍得严重依赖于柴油发电厂，因此这项工作进一步建议将发电厂中的二氧化碳（CO ₂）用作热采流体和可能的CO ₂隔离成深层花岗岩。结果表明，在当前油田下实施EGS将在技术，环境和经济上均具有显着优势。温暖温度下的油田采出水提高了热采效率，地热井中油田水的利用将减少水处理和处置所涉及的成本。地热梯度足以在较高温度下生产水，可以由不同的二元发电厂在商业上利用。使用CO ₂作为热提取液显示出显着的热提取，高于使用油田采出水。此外，大量的CO ₂ 可将其沉积到地层中，从而减少温室气体向大气的排放。