在数据稀少的可变饱和区域利用拖曳时域电磁学确定含水层特征

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Jiawei Li, Ryan Smith, Katherine Grote, Jesper Bjergsted Pedersen
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引用次数: 0

摘要

犹他州帕洛万谷是一个农业区,近几十年来,由于大量抽取地下水,该地区出现了严重的地表沉降。下沉的主要原因是抽水导致地下水水头下降,细粒地层发生固结。准确了解地下细粒材料的分布有助于预测未来的沉降。对整个帕洛万山谷以往研究的钻探记录进行的分析表明,这里存在大量的细粒单位,但这些记录的质量参差不齐,而且钻探的空间分布有限,因此准确确定细粒单位的位置和范围具有挑战性。为了克服钻探记录分析的局限性,我们采集了地面和钻孔地球物理数据。地面数据是利用拖曳式时域电磁(tTEM)系统在山谷的大片区域采集的,该系统可测量不同深度区间的电阻率。这些数据被用来描述在时域电磁勘探深度(60 米)范围内细粒和粗粒沉积物的分布特征。在时域电磁勘探深度附近的三个钻孔中采集了伽马数据,与电阻率数据和钻探日志进行比较,以进一步验证时域电磁勘探的电阻率数据。在这项研究中,我们开发了一种在地质信息稀少和饱和度变化的地区进行岩石物理转换的方法,以及一种根据岩性信息的可用性使用多种方法的方案,使我们能够在地质条件复杂的地区进行稳健的岩石物理转换。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Aquifer characterization using towed time-domain electromagnetics in a variably saturated, data-sparse region

Parowan Valley, Utah is an agricultural area experiencing significant subsidence in recent decades due to extensive groundwater extraction. The subsidence occurs primarily due to consolidation in fine-grained units as groundwater heads decrease due to pumping. Efforts to predict future subsidence would be facilitated by an accurate understanding of the distribution of fine-grained materials in the subsurface. An analysis of drillers' logs across Parowan Valley from previous research indicates that significant fine-grained units are present, but the variable quality of these logs, as well as the limited spatial distribution of borings, makes the accurate determination of the location and extent of fine-grained units challenging. To overcome the limitations of drillers' logs analysis, ground-based and borehole geophysical data were acquired. The ground-based data were collected over large sections of the valley using a towed Time-Domain Electromagnetic (tTEM) system that measures electrical resistivity over different depth intervals. These data were used to characterize the distribution of fine- and coarse-grained sediments within the tTEM depth of investigation of ∼60 m. Borehole gamma data were acquired in three boreholes near the tTEM traverses to compare with resistivity data and drillers' logs for further validation of tTEM resistivity data. In this study, we developed a methodology for rock physics transforms in regions with sparse geological information and variable saturation, as well as a scheme for using a variety of methods depending on the availability of lithology information, enabling us to produce robust rock physics transforms in an area with complex geological conditions.

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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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