Evaluation of small-loop transient electromagnetic soundings to locate the Sherwood Sandstone aquifer and confining formations at well sites in the Vale of York, England

Meju, Max A.; Fenning, P. J.; Hawkins, Troy R.

doi:10.1016/s0926-9851(00)00005-7

Cited by 27 publications

(12 citation statements)

References 32 publications

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“…Due to the ease of use and high lateral resolution, small‐loop TEM devices have recently attracted great attention (Meju et al . ; Ranieri et al . ; Yan et al .…”

Section: Introductionmentioning

confidence: 99%

“…In space constrained areas such as undulating mountains and coal mine fields, small-loop instruments are preferred for TEM exploration since large loops are difficult to deploy. Due to the ease of use and high lateral resolution, small-loop TEM devices have recently attracted great attention (Meju et al 2000;Ranieri et al 2005;Yan et al 2009). The depth of investigation in TEM exploration is mainly determined by the detection time (Spies 1989).…”

Section: Introductionmentioning

confidence: 99%

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Transient process and optimal design of receiver coil for small‐loop transient electromagnetics

Zhang

et al. 2013

Geophysical Prospecting

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Distributed parameters of the receiver coils greatly affect transient electromagnetic signals over short time periods, causing a delay in the signal's effective sampling time and the loss of shallow exploration information. This paper investigates the influence of transient process on apparent resistivity calculation and analyses the relations between the error of apparent resistivity and receiver coil design. We find that, under the same effective area, different radii of the receiver coils lead to different levels of impact on the estimation of the apparent resistivity. An optimization model is proposed to determine the optimal receiver coil size that gives rise to the smallest estimation error of the apparent resistivity. The relationship between the optimal radius and the effective areas is developed, which serves as a guideline for the optimal receiver coil design. The results may provide a useful means for improving the accuracy of the small loop transient electromagnetic instrumentation for shallow‐depth mapping.

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“…Due to the ease of use and high lateral resolution, small‐loop TEM devices have recently attracted great attention (Meju et al . ; Ranieri et al . ; Yan et al .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transient process and optimal design of receiver coil for small‐loop transient electromagnetics

Zhang

et al. 2013

Geophysical Prospecting

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“…McNeill () discussed the advantages and disadvantages of various electromagnetic methods applied to groundwater studies; Nowroozi et al () used galvanic methods for detection of saltwater intrusion in fresh aquifers; Yang et al () included TEM soundings; and Choudhury et al () included shallow seismic refraction. Other good examples of integrated electric and electromagnetic techniques applied to aquifer mapping can be found in Meju et al () and Senos Matias et al ().…”

Section: Introductionmentioning

confidence: 99%

Mapping fly‐ash water pond leakage with TEM and IP data at Loy Yang coal‐mine (Australia)

Viezzoli

Cull

Massie

2006

Near Surface Geophysics

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The fly‐ash water pond at the Loy Yang power station (Latrobe Valley, Victoria, Australia) seeps and therefore presents a hazard to the local environment from its high total dissolved solids content. A transient electromagnetic survey (TEM) was completed to investigate the contaminant plume in more detail. The contaminate plume was successfully delineated; however, multiple contiguous soundings featured late‐time negative decays not typically recorded in coincident‐loop TEM surveys. This indicates that conductivity is frequency‐dependent. These anomalous soundings suggested the presence of a shallower contaminate plume than that mapped by the boreholes and therefore further analysis was required. An induced polarization survey revealed that the area where the late‐time negative responses were recorded coincided with a shallow conductive and extremely chargeable anomaly. A simple power‐law relationship holds between the negative transients decay rates and normalized apparent chargeability. Analysis on soil samples obtained from auger holes related the polarization anomaly to clay‐, organic‐ and metal‐rich layers of fill material.

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“…The regularization matrix D (Constable et al, 1987) may be the identity matrix or a first or second difference operator that allows model parameters to vary either smoothly or sharply in the vertical and lateral directions. There is an extensive literature on the use of a priori or extraneous information to reduce non-uniqueness (Jackson, 1979) in CSEM inversion (see e.g., Meju, 1994aMeju, , 1996Meju, , 2004Meju et al, 2000).…”

Section: Inversion Of Csem Datamentioning

confidence: 99%

“…It is fast for idealized 1-D problems (e.g., Christensen 1995Christensen , 2000Meju et al, 2000) but in reality the subsurface is heterogeneous and requires a 3-D approach. Fully 3-D CSEM inversion is computationally expensive.…”

Section: Inversion Of Csem Datamentioning

confidence: 99%

Near-Surface Controlled-Source Electromagnetic Induction

Everett

Meju

Water Science and Technology Library

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The controlled-source electromagnetic (CSEM) induction method is emerging as a leading geophysical technique in hydrogeological studies. However, the technique is quite often misunderstood compared to other common techniques of applied geophysics: namely, seismic reflection and refraction, magnetics, gravity, and ground-penetrating radar (GPR). In this chapter we review the fundamental physical principles behind the CSEM prospecting technique, with emphasis on near-surface applications, and present some recent advances in this field that have been made by the authors. CSEM methods are defined here to be those in which the experimenter has knowledge of and control over the electromagnetic field transmitted into the ground and hence excludes magnetotellurics, related naturalsource methods, and the various uncontrolled-source methods involving, for example, radio transmissions.CSEM methods for investigating subsurface geology began in earnest in the 1950s and 1960s with the advent of airborne systems mainly for mining applications. Later, with the development of portable and inexpensive ground-based instruments, CSEM systems were applied to groundwater prospecting in arid or hard-rock environments. Due to the upsurge in interest in environmental applications in the past one or two decades, the CSEM method is currently experiencing a rapid growth in use by hydrogeologists, civil and geotechnical engineers, engineering geologists, and others not trained specifically in the technique.The CSEM method is sensitive to electrical conductivity averaged over the volume of ground in which induced electric currents are caused to flow. Amongst the surface-based geophysical methods that sense bulk electrical properties of the ground, CSEM offers deeper penetration capability than GPR techniques and greater resolving power than DC resistivity methods. The CSEM method performs well in conductive soils or high radar reflectivity zones where GPR often encounters difficulties. The CSEM method also performs well in highly resistive terrains where establishing good electrode contact with the ground, as required for most DC methods, often is problematic. Introduction 157Y. Rubin and S. S. Hubbard (eds.), Hydrogeophysics, 157-183.

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Evaluation of small-loop transient electromagnetic soundings to locate the Sherwood Sandstone aquifer and confining formations at well sites in the Vale of York, England

Cited by 27 publications

References 32 publications

Transient process and optimal design of receiver coil for small‐loop transient electromagnetics

Transient process and optimal design of receiver coil for small‐loop transient electromagnetics

Mapping fly‐ash water pond leakage with TEM and IP data at Loy Yang coal‐mine (Australia)

Near-Surface Controlled-Source Electromagnetic Induction

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