结合交叉钻孔和反射钻孔-GPR,对浅含水层中的受控冻结进行成像

IF 3.2 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Peter Jung, Götz Hornbruch, Andreas Dahmke, Peter Dietrich, Ulrike Werban
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引用次数: 0

摘要

摘要在 "TestUM "试验场地,地质潜热储存系统作为供热和制冷需求方面的一种潜在选择,在试验运行期间,浅层第四纪冰川含水层的一部分被冻结。为了评估地下当前的热状态,必须知道冻结体积的大小。由于目标太深,无法从地表进行高分辨率成像,因此需要评估钻孔探地雷达(GPR)的使用情况。为了对垂直冻融边界进行成像和监测,采用了跨孔零偏和反射测量。零点偏移测量可对冰冻进行成像,但由于缺乏冰冻沉积物的速度信息,对冰体大小的确定并不明确。反射测量能够对冻结边界的位置进行成像,通过重复测量确定的精度为±0.1 米,这主要依赖于 ZOP 的速度信息。我们发现,ZOP 和反射测量法的互补使用是一种快速、简单的方法,可以对地质潜热储存系统中的冻结进行成像。问题是存在来自其他观测井的叠加反射和低信噪比。使用多口观测井可以估算冰体大小。通过零偏移剖面(ZOP)得出的速度模型,可以将基于直接推动测井和沉积岩芯的地质信息推断为三维次表层模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Combining crosshole and reflection borehole-GPR for imaging controlled freezing in shallow aquifers
Abstract. During test operation of a geological latent heat storage system as a potential option in the context of heat supply for heating and cooling demands a part of a shallow quaternary glacial aquifer at the “TestUM” test site is frozen. To evaluate the current thermal state in the subsurface the dimension of the frozen volume has to be known. With the target being too deep for high resolution imaging from the surface, the use of borehole Ground-Penetrating-Radar (GPR) is assessed. For imaging and monitoring of a vertical freeze-thaw boundary, crosshole zero-offset and reflection measurements are applied. The freezing can be imaged in ZOP, but determination of ice body size is ambiguous, because of lacking velocity information in the frozen sediment. Reflection measurements are able to image the position of the freezing boundary with an accuracy determined through repeated measurements of ±0.1 m, relying on the velocity information from ZOP. We found, that the complementary use of ZOP and reflection measurements make for a fast and simple method, to image freezing in geological latent heat storage systems. Problematic is the presence of superimposed reflections from other observation wells and low signal-to-noise ratio. The use in multiple observation wells allows for an estimation of ice body size. A velocity model derived from zero-offset profiles (ZOP) enabled to extrapolate geological information from direct-push based logging and sediment cores to a 3D-subsurface model.
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来源期刊
Solid Earth
Solid Earth GEOCHEMISTRY & GEOPHYSICS-
CiteScore
6.90
自引率
8.80%
发文量
78
审稿时长
4.5 months
期刊介绍: Solid Earth (SE) is a not-for-profit journal that publishes multidisciplinary research on the composition, structure, dynamics of the Earth from the surface to the deep interior at all spatial and temporal scales. The journal invites contributions encompassing observational, experimental, and theoretical investigations in the form of short communications, research articles, method articles, review articles, and discussion and commentaries on all aspects of the solid Earth (for details see manuscript types). Being interdisciplinary in scope, SE covers the following disciplines: geochemistry, mineralogy, petrology, volcanology; geodesy and gravity; geodynamics: numerical and analogue modeling of geoprocesses; geoelectrics and electromagnetics; geomagnetism; geomorphology, morphotectonics, and paleoseismology; rock physics; seismics and seismology; critical zone science (Earth''s permeable near-surface layer); stratigraphy, sedimentology, and palaeontology; rock deformation, structural geology, and tectonics.
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