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Outcrop analogue study to determine reservoir properties of the Los Humeros and Acoculco geothermal fields, Mexico

机译:露出模拟研究,确定墨西哥洛杉矶悍马和煤炭地热田的水库特性

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摘要

The Los Humeros geothermal system is steam dominated andcurrently under exploration with 65 wells (23 producing). Havingtemperatures above 380 °C, the system is characterized as a superhot geothermal system (SHGS). The development of such systems is stillchallenging due to the high temperatures and aggressive reservoir fluidswhich lead to corrosion and scaling problems. The geothermal system inAcoculco (Puebla, Mexico; so far only explored via two exploration wells) ischaracterized by temperatures of approximately 300 °C at a depthof about 2 km. In both wells no geothermal fluids were found, even though awell-developed fracture network exists. Therefore, it is planned to developan enhanced geothermal system (EGS).For better reservoir understanding and prospective modeling, extensivegeological, geochemical, geophysical and technical investigations areperformed within the scope of the GEMex project. Outcrop analogue studieshave been carried out in order to identify the main fracture pattern,geometry and distribution of geological units in the area and tocharacterize all key units from the basement to the cap rock regardingpetro- and thermo-physical rock properties and mineralogy. Ongoinginvestigations aim to identify geological and structural heterogeneities ondifferent scales to enable a more reliable prediction of reservoirproperties. Beside geological investigations, physical properties of thereservoir fluids are determined to improve the understanding of thehydrochemical processes in the reservoir and the fluid-rock interactions,which affect the reservoir rock properties.
机译:LOS Humeros地热系统是蒸汽占主导地位的目前正在探索65洞(23种生产)。拥有温度高于380°C,该系统的特点是超级热地热系统(SHGS)。这种系统的发展仍然存在由于高温和侵蚀性水库液体而挑战这导致腐蚀和缩放问题。地热系统Acoculco(墨西哥普埃布拉;到目前为止仅通过两大勘探井探索)是以深度为特征在约300°C的温度约2公里。在两个井中,也没有发现地热液体,即使是一个发达良好的骨折网络存在。因此,计划发展增强的地热系统(EGS)。对于更好的水库了解和预期建模,广泛地质,地球化学,地球物理和技术调查是在Gemex项目的范围内进行。露头模拟研究已经进行以识别主要骨折模式,地区地质单位的几何和分布将所有关键单位从地下室到盖岩的表征石油和热物理岩石特性和矿物学。持续的调查旨在识别地质和结构性异质性不同的尺度,以实现更可靠的水库预测特性。除了地质调查,物理性质确定储层液体以改善对其的理解水库中的水化学过程和流体岩相互作用,影响水库岩石属性。

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