High-resolution aquifer characterization using seismic cross-hole tomography: An evaluation experiment in a gravel delta

Becht, Andreas; Bürger, Claudius; Kostic, Boris; Appel, Erwin; Dietrich, Peter

doi:10.1016/j.jhydrol.2007.01.005

Cited by 15 publications

(7 citation statements)

References 35 publications

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“…Even advanced noninvasive techniques such as modern tomographical or georadar geophysical examination can only approximate subsurface structures (e.g. Becht et al, 2007;Brauchler et al, 2010) and often deliver non-unique results. Hydrogeological and geophysical site investigation thus is ideally complemented by process-based geological analysis and characterization of deposition environments.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional high resolution fluvio-glacial aquifer analog: Part 1: Field study

Bayer

Huggenberger

Renard

et al. 2011

Journal of Hydrology

100

106

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s u m m a r yDescribing the complex structures that exist in many sedimentary aquifers is crucial for reliable groundwater flow and transport simulation. However, hardly any aquifer can be inspected in such detail that all decimeter to meter heterogeneity is resolved. Aquifer analogs serve as surrogates to construct models of equivalent heterogeneity, and thus imitate those features relevant for flow or transport processes. Gravel pits found in excavation show excellent sections of the sedimentary sequence and thus offer direct insight into the structural and textural composition of the subsoil. This paper describes an approach to also inspect the third dimension: by mapping during the ongoing excavation it is possible to obtain a three-dimensional representation of the subsurface within a short period of time. A detailed description of a case study is presented and the findings from sedimentological, hydrogeological and geophysical analyses are compared. The gravel pit is located near the town of Herten in southwest Germany, where relatively young unconsolidated fluvio-glacial and fluvial sediments in the Rhine basin are mined. The excavated gravel body is built up by architectural elements typical for braided river deposits. The study generated a high-resolution data set of lithofacies, hydrofacies and ground penetrating radar (GPR) profiles. It represents the basis for a full three-dimensional geostatistical reconstruction presented in the second part

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Section: Introductionmentioning

confidence: 99%

Three-dimensional high resolution fluvio-glacial aquifer analog: Part 1: Field study

Bayer

Huggenberger

Renard

et al. 2011

Journal of Hydrology

100

106

View full text Add to dashboard Cite

show abstract

“…Nevertheless, this imaging approach has certain limitations. For example, in 2D computed tomography (CT) imaging, only adjacent wells can be imaged, and information from multiple wells distributed in 3D space cannot be effectively utilized [26]. As a result, the utilization rate of spatial well locations remain relatively low.…”

Section: Introductionmentioning

confidence: 99%

An Application of 3D Cross-Well Elastic Reverse Time Migration Imaging Based on the Multi-Wave and Multi-Component Technique in Coastal Engineering Exploration

Peng,

Cheng,

et al. 2024

JMSE

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Precise surveys are indispensable in coastal engineering projects. The extensive presence of sand in the coastal area leads to significant attenuation of seismic waves within unsaturated loose sediments. As a result, it becomes challenging for seismic waves to penetrate the weathered zone and reach the desired depth with significant amount of energy. In this study, the application of three-dimensional (3D) cross-well elastic reverse time migration (RTM) imaging based on multi-wave and multi-component techniques in coastal engineering exploration is explored. Accurate decomposition of vector compressional (P) and shear (S) waves is achieved through two wavefield decoupling algorithms without any amplitude and phase distortion. Additionally, compressional wave pressure components are obtained, which facilitates subsequent independent imaging. This study discusses and analyzes the imaging results of four imaging strategies under cross-correlation imaging conditions in RTM imaging. The analysis leads to the conclusion that scalarizing vector wavefields imaging yields superior imaging of P- and S-waves. Furthermore, the imaging results obtained through this approach are of great physical significance. In order to validate the efficacy of this method in 3D geological structure imaging in coastal areas, RTM imaging experiments were performed on two representative models. The results indicate that the proposed 3D elastic wave imaging method effectively generates accurate 3D cross-well imaging of P- and S-waves. This method utilizes the multi-wave and multi-component elastic wave RTM imaging technique to effectively leverage the Earth’s elastic medium without increasing costs. It provides valuable information about the distribution of subsurface rock layers, interfaces, and other structures in coastal engineering projects. Importantly, this can be achieved without resorting to extensive excavation or drilling operations. This method addresses the limitations of current cross-well imaging techniques, thereby providing abundant and accurate geological and geophysical information for the analysis and interpretation of 3D geological structures in coastal engineering projects. It has important theoretical and practical significance in real-world production, as well as for the study of geological structures in coastal engineering.

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“…For large-scale karst detection, engineering drilling faces challenge in high economic and time costs, and it is hard to satisfy the demand since karst could be easily missed beyond the tiny borehole region. Current engineering geophysical methods providing quantitative results in karst detection include the tube wave detecting method [Li and Rao, 2005], multifrequency acoustic wave detection [Liu et al, 2020], ground penetrating radar [Bermejo et al, 2020;Kanemitsu et al, 2024] , and cross-hole seismic tomography [Becht et al, 2007;Wang et al, 2022].…”

Section: Introductionmentioning

confidence: 99%

Joint inversion of surface and borehole seismic data using adjoint-state traveltime tomography for karst exploration

Cui,

Peng,

Tong

et al. 2024

Preprint

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Karst poses a major safety risk in engineering construction within limestone areas, yet accurate and efficient detection remains challenging for conventional geophysical prospecting methods. An expressway bridge is planning to be broadened out, the argillaceous limestone bedrock covered by ~40 m thick Quaternary overburden layer is designed as the bearing stratum for pile foundation. Karst is moderately developed in the bedrock. This study employs a recently developed eikonal-equation based adjoint state traveltime tomography method to analyze karst characteristics. The advantages of this novel tomography method include its independence of ray tracing, high accuracy in complex heterogeneous media, and computational efficiency. The joint inversion of surface and borehole seismic data further enhances resolution and reliability. Totally 225 nodal geophones were deployed along a 236.4m-long two-dimensional line, intersecting a borehole that reveals a semi-filled karst cave at the depth range of 42.2-46.7 m. The seismic results demonstrate three horizontally adjacent yet disconnected karst caves within the depth range of 40-50 m below the survey line. Each cave is accompanied by a subvertical low-velocity channel extending to the base of the silty clay layer. The width of the channel appears proportional to the size of the cave, suggesting its role as a runoff passage connecting the karst cave and overlying permeable gravel layer.

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High-resolution aquifer characterization using seismic cross-hole tomography: An evaluation experiment in a gravel delta

Cited by 15 publications

References 35 publications

Three-dimensional high resolution fluvio-glacial aquifer analog: Part 1: Field study

Three-dimensional high resolution fluvio-glacial aquifer analog: Part 1: Field study

An Application of 3D Cross-Well Elastic Reverse Time Migration Imaging Based on the Multi-Wave and Multi-Component Technique in Coastal Engineering Exploration

Joint inversion of surface and borehole seismic data using adjoint-state traveltime tomography for karst exploration

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