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Zhenjiao Jiang Gregoire Mariethoz Christoph Schrank Malcolm Cox Wendy Timms 《Hydrogeology Journal》2016,24(8):2143-2155
Coal-seam gas production requires groundwater extraction from coal-bearing formations to reduce the hydraulic pressure and improve gas recovery. In layered sedimentary basins, the coalbeds are often separated from freshwater aquifers by low-permeability aquitards. However, hydraulic connection between the coalbed and aquifers is possible due to the heterogeneity in the aquitard such as the existence of conductive faults or sandy channel deposits. For coal-seam gas extraction operations, it is desirable to identify areas in a basin where the probability of hydraulic connection between the coalbed and aquifers is low in order to avoid unnecessary loss of groundwater from aquifers and gas production problems. A connection indicator, the groundwater age indictor (GAI), is proposed, to quantify the degree of hydraulic connection. The spatial distribution of GAI can indicate the optimum positions for gas/water extraction in the coalbed. Depressurizing the coalbed at locations with a low GAI would result in little or no interaction with the aquifer when compared to the other positions. The concept of GAI is validated on synthetic cases and is then applied to the north Galilee Basin, Australia, to assess the degree of hydraulic connection between the Aramac Coal Measure and the water-bearing formations in the Great Artesian Basin, which are separated by an aquitard, the Betts Creek Beds. It is found that the GAI is higher in the western part of the basin, indicating a higher risk to depressurization of the coalbed in this region due to the strong hydraulic connection between the coalbed and the overlying aquifer. 相似文献
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以康定老榆林地区地热系统为研究对象,利用TOUGH-Isotope程序进行水-热-同位素耦合数值模拟,并鉴于研究区大气降水氢氧同位素季节性明显、地震活动活跃,探讨了补给水同位素特征、热储层渗透性变化对地热系统氢氧同位素迁移过程的影响.研究结果表明氢氧同位素模拟值与研究区ZK3钻孔流出水测试值基本拟合,高温地热系统的对流-弥散作用对氢氧同位素迁移过程影响明显;研究区地热水循环条件较好,水-岩作用程度较低,导致氧同位素重化现象不明显;补给水同位素特征、热储层渗透性两个因素对地热水循环过程中的氢氧同位素分布具有明显的影响.开展地热系统流体氢氧同位素迁移过程研究,有助于提高对地热系统动态演化的定量化认识,为地热开发提供支持. 相似文献
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Li Yasong Liu Chunlei Cao Shengwei Miao Qingzhuang Dong Yan Jiang Zhenjiao 《Hydrogeology Journal》2021,29(6):2211-2218
Low-to-medium temperature geothermal fluids in the granite regions of southeastern China are an important renewable energy resource, but they are also a source of contamination containing highly toxic elements such as fluoride and arsenic. This study analyzed the origin of the geothermal fluids in a regional-scale hydrogeological unit in the city of Xiamen, China, based on isotope and hydrochemical analyses. The Br/Cl ratios suggested that the inland geothermal fluid is merely recharged by rainwater from the mountain edge, while the coastal geothermal fluid is originally recharged by the seawater and later mixed with rain-derived groundwater. The geothermal water featured high SiO2 and detectable Zn concentrations. The former reflects the significant water–granite interaction along the flow path, and the latter indicates the active hydraulic connection between surface waters, shallow aquifers and deep geothermal fluids. High radon content was detected near the deep conductive fault adjacent to a geothermal well, demonstrating that the fault damage zone acts as a major conduit for upward transport of the deep geothermal fluid. As a result, the fault damage zones developed in the granite are necessary for the formation of geothermal water, which leads to the uneven distribution of geothermal water in the subsurface. High-temperature geothermal water can be found in those regions with fairly sparse fault damage zones. In contrast, in the region with high-density fault activities, the active communication between shallow cool water and deep geothermal fluids can decrease the water temperature.
相似文献5.
Application of 1D paleo‐fluvial process modelling at a basin scale to augment sparse borehole data: example of a Permian formation in the Galilee Basin,Australia 
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下载免费PDF全文 Zhenjiao Jiang Gregoire Mariethoz Matthias Raiber Wendy Timms Malcolm Cox 《水文研究》2016,30(10):1624-1636
The heterogeneous hydraulic conductivity (K) in water‐bearing formations controls subsurface flow and solute transport processes. Geostatistical techniques are often employed to characterize the K distribution in space based on the correlation between K measurements. However, at the basin scale, there are often insufficient measurements for inferring the spatial correlation. This is a widespread problem that we address in this study using the example of the Betts Creek Beds (BCB) in the Galilee Basin, Australia. To address the lack of data, we use a 1D stochastic fluvial process‐based model (SFPM) to quantify the total sediment thickness, Z( x ), and the sandstone proportion over the total thickness, Ps( x ), in the BCB. The semivariograms of Z( x ) and Ps( x ) are then extracted and used in sequential Gaussian simulation to construct the 2D spatial distribution of Z( x ) and Ps( x ). Ps( x ) can be converted to a K distribution based on classical averaging methods. The results demonstrate that the combination of SFPM and geostatistical simulation allows for the evaluation of upscaled K distribution with a limited number of K measurements. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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干热岩资源和增强型地热工程:国际经验和我国展望 总被引：1，自引：0，他引：1
干热岩（HDR）是一种没有水或含有少量水的高温岩体,保守估计地壳中3~10 km深处干热岩所蕴含的能量相当于全球所有石油、天然气和煤炭所蕴藏能量的30倍。增强型地热系统（EGS）是指通过水力压裂等工程手段在地下深部低渗透性干热岩体中形成人工地热储层,采出相当数量热能的人工地热系统。EGS的研究与开发已有40年的历史,但早期只局限在美国、英国、法国、日本、澳大利亚等国家,我国这方面的研究于近几年起步。目前干热岩的开发面临诸多挑战,如大体积人工裂隙热储的建造、实现EGS商业化需要进一步研究和技术开发等。本文回顾分析了国际上重要EGS示范场地建设和研究过程中所取得的经验和积累的教训,讨论了我国近几年的研究进展,希望为我国今后EGS研究和工程化示范提供参考和借鉴。 相似文献
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人工压裂是获取干热岩型地热资源的关键环节,压裂后的人工裂隙带结构对开采条件下水热传递过程具有重要控制作用。结合我国共和盆地干热岩储层地质条件,采用数值模拟方法着重分析干热岩不同产状人工裂隙带的渗透率与宽度对热储中水热传递过程的影响机理,明确不同人工裂隙结构条件下水热产出能力,进而优化井间距。结果表明:当人工裂隙带渗透率较小时（小于5 D）,裂隙带规模越大,开采井温度越高;当渗透率较大时（大于10 D）,在水平裂隙带中,随着裂隙带规模的增加,由于注入冷水的快速扩散导致整体低温区域增加,开采井温度反而降低。在水平裂隙带中注入冷水主要为水平向流动,随着渗透率的增加,开采井温度更易受注入冷水的影响而降低;但在垂直裂隙带及倾斜裂隙带中,随着渗透率的增加,垂向自由对流增强,注入冷水更易于向储层底部高温区域流动,经加热后到达开采井,使得开采温度提升。综合比较,同一井间距条件下,低渗水平裂隙带以及高渗垂直裂隙带的产热能力较其他裂隙带更强。 相似文献
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Geothermal springs are some of the most obvious indicators of the existence of high-temperature geothermal resources in the subsurface. However, geothermal springs can also occur in areas of low average subsurface temperatures, which makes it difficult to assess exploitable zones. To address this problem, this study quantitatively analyzes the conditions associated with the formation of geothermal springs in fault zones, and numerically investigates the implications that outflow temperature and discharge rate from geothermal springs have on the geothermal background in the subsurface. It is concluded that the temperature of geothermal springs in fault zones is mainly controlled by the recharge rate from the country rock and the hydraulic conductivity in the fault damage zone. Importantly, the topography of the fault trace on the land surface plays an important role in determining the thermal temperature. In fault zones with a permeability higher than 1 mD and a lateral recharge rate from the country rock higher than 1 m3/day, convection plays a dominant role in the heat transport rather than thermal conduction. The geothermal springs do not necessarily occur in the place having an abnormal geothermal background (with the temperature at certain depth exceeding the temperature inferred by the global average continental geothermal gradient of 30 °C/km). Assuming a constant temperature (90 °C here, to represent a normal geothermal background in the subsurface at a depth of 3,000 m), the conditions required for the occurrence of geothermal springs were quantitatively determined. 相似文献
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增强型地热系统：国际研究进展与我国研究现状 总被引：10，自引：0，他引：10
干热岩地热能源已经受到全世界广泛关注。基于干热岩能源的巨大潜力和我国日益增长的能源需求,近年来,政府、大学、科研院所和企业在干热岩资源勘查、增强型地热(EGS)等方面做了许多科学研究与技术开发。为了促进我国干热岩资源的开发和增强型地热系统(EGS)示范场地的建设,本文收集和整理了国内外大量文献和相关资料,分析了目前国际典型EGS示范场地最新研究动态,总结了2013~2016年国际上开发最为活跃的EGS场地在开发过程中所取得的经验和教训。结合我国现有EGS场地的具体条件,详细阐述了我国干热岩远景区存在的问题,并对我国未来干热岩的开发和示范场地的建设提出建议。 相似文献
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Tianfu Xu Zhaoyun Hou Xiaofeng Jia Nicolas Spycher Zhenjiao Jiang Bo Feng Jin Na Yilong Yuan 《Environmental Earth Sciences》2016,75(24):1502
To reconstruct deep fluid chemical composition and increase the confidence in estimated reservoir temperatures, a more integral geothermometry method was compared to other classical geothermometers. Here, we apply the integrated multicomponent geothermometry (IMG) method using the GeoT code to estimate reservoir temperatures at the Tengchong geothermal field in Southwestern China. Results show reservoir temperatures calculated using the quartz geothermometer are closest to those estimated with the IMG method. The concentrations of Al and Mg, as well as selected minerals for geothermometry computations, are key factors for successfully using the IMG. Using the IMG method together with classical geothermometers can significantly increase confidence in reservoir temperature estimations. The methods presented and simulation program used here may be useful for analysis of other geothermal fields under similar conditions. 相似文献