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Some Studies Of Time And Frequency Domain Electromagnetic Prospecting Methods
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Book Synopsis Some Studies of Time- and Frequency-domain Electromagnetic Prospecting Methods by : Douglas John La Brecque
Download or read book Some Studies of Time- and Frequency-domain Electromagnetic Prospecting Methods written by Douglas John La Brecque and published by . This book was released on 1984 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electromagnetic Methods in Geophysics by : Fabio Giannino
Download or read book Electromagnetic Methods in Geophysics written by Fabio Giannino and published by John Wiley & Sons. This book was released on 2021-10-05 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discover the utility of four popular electromagnetic geophysical techniques In GeoRadar, FDEM, TDEM, and AEM Methods, accomplished researchers Fabio Giannino and Giovanni Leucci deliver an in-depth exploration of the theory and application of four different electromagnetic geophysical techniques: ground penetrating radar, the frequency domain electromagnetic method, the time domain electromagnetic method, and the airborne electromagnetic method. The authors offer a full description of each technique as they relate to the economics, planning, and logistics of deploying each of them on-site. The book also discusses the potential output of each method and how it can be combined with other sources of below- and above-ground information to create a digitized common point cloud containing a wide variety of data. Giannino and Leucci rely on 25 years of professional experience in over 40 countries around the world to provide readers with a fulsome description of the optimal use of GPR, FDEM, TDEM, and AEM, demonstrating their flexibility and applicability to a wide variety of use cases. Readers will also benefit from the inclusion of: A thorough introduction to electromagnetic theory, including the operative principles and theory of ground penetrating radar (GPR) and the frequency domain electromagnetic method (FDEM) An exploration of hardware architecture and surveying, including GPR, FDEM, time domain electromagnetic method (TDEM), and airborne electromagnetic (AEM) surveying A collection of case studies, including a multiple-geophysical archaeological GPR survey in Turkey and a UXO search in a building area in Italy using FDEM /li> Discussions of planning and mobilizing a campaign, the shipment and clearance of survey equipment, and managing the operative aspects of field activity Perfect for forensic and archaeological geophysicists, GeoRadar, FDEM, TDEM, and AEM Methods will also earn a place in the libraries of anyone seeking a one-stop reference for the planning and deployment of GDR, FDEM, TDEM, and AEM surveying techniques.
Book Synopsis Electromagnetic Methods in Applied Geophysics by : Misac N. Nabighian
Download or read book Electromagnetic Methods in Applied Geophysics written by Misac N. Nabighian and published by SEG Books. This book was released on 1988 with total page 989 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a slag heap, the result of strip mining, creeps closer to his house in the Ohio hills, fifteen-year-old M. C. is torn between trying to get his family away and fighting for the home they love.
Book Synopsis Analytic Comparison of Time- and Frequency-domain Electromagnetic Methods by :
Download or read book Analytic Comparison of Time- and Frequency-domain Electromagnetic Methods written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The time- and frequency-domain methods of electromagnetic geophysical prospecting are compared to determine the similarities and differences and to recommend system choices for particular field situations. Only the wire-loop configuration is considered, as this array is quite standard in geothermal prospecting. Comparisons are carried out using hardware and physical considerations, a large catalog of 3-layer model curves, 2D-3D model calculations, and by comparing Fourier transforms and layered inversions of field data from the Randsburg KGRA in California. The results generally indicate that frequency-domain methods offer better resolution and more practical hardware design for long-offset shallow applications. They also have a much better backup in terms of modelling tools for interpretation and history of experience. Transient methods are better suited for deeper probing, for both long- and short-offset applications. Frequency-domain methods are limited by the primary field, which is subject to distortion from near-surface inhomogeneites; this is also the case for early-time transients. Transient measurements in late time are limited by ambient electromagnetic noise and dynamic range of receiving equipment.
Book Synopsis Time Domain and Multifrequency Electromagnetic Response in Mineral Prospecting by : Ganpat S. Lodha
Download or read book Time Domain and Multifrequency Electromagnetic Response in Mineral Prospecting written by Ganpat S. Lodha and published by . This book was released on 1977 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extensive, wide band EM surveys were made over three previously known bedrock conductors in the Canadian Shield. The conductors varied in size from small to very large, having strike lengths of approximately 100 m., 300 m. and 2 kms. All the conductors are located in crystalline host rocks which appear to be quite resistive. They are mostly covered by overburden whose thickness and conductivity are not well known, but which probably do not exceed 15 m. and 10-2 mhos/m respectively. The characteristics of the conductors (geometry and conductance) are only partially known from drilling. The surveys were carried out with UTEM Mark II system built at the University of Toronto by Y. Lamontagne and G. F. West. The observed data were compared with the theoretical data computed by using a free-space rectangular thin plate model. The parameters of the models were adjusted, within the known geological constraints, to achieve a best fit between the model and field responses. It was apparent in each case that some aspects of the observed responses cannot be explained on the basis of the simple models. However, in all cases the response at intermediate or later delay times could be matched reasonably well with the responses computed for models whose parameters are consistent with the known geology. The present research was devoted to investigating the validity of EM interpretation methods based on the use of simple uniform models in free space. It is well known that such simple models are not valid for the geological situations that exist in some parts of the world. However, it is widely believed that such simple models are indeed valid in areas of relatively resistive host rock and overburden such as the Canadian and Baltic Shields. The three studies reported in this thesis give some qualified support to this belief in simple models. In all three cases the induced current system (at least over most of the time range studied) is believed to be basically a vortex current in the main conductor and does not involve the host rock and overburden. Considerable deviations of the observed response from that of simple model response are found at early delay times. These deviations are believed to be due to the effects of the finite thickness of the conductive zone and of a halo of poorly conducting material situated around the main core. Whatever its cause, this effect has an important bearing on the interpretation techniques. It appears that natural conductors do not have a clear inductive limit to their response as do simple models, and this makes the interpretation of size and geometry more difficult. It also means that conductivity thickness (conductance) estimates based on simple models can be erroneous (too low) unless the late stage of the time delay (or the low frequency, resistive range of the frequency response) is observed. Computer programmes were developed by extending Annan's (74) eigen function technique to compute responses for airborne, ground and drill hole EM systems in the time or frequency domain for a free space, rectangular, finite, thin sheet model. This model was then utilised to compare the responses of various recently developed time domain and multifrequency EM systems. UTEM, Crone PEM and INPUT systems were studied in the time domain. Turam loop and horizontal loop EM systems were studied in the frequency domain.
Book Synopsis Electromagnetic Methods in Applied Geophysics: Theory by : Misac N. Nabighian
Download or read book Electromagnetic Methods in Applied Geophysics: Theory written by Misac N. Nabighian and published by . This book was released on 1988 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a slag heap, the result of strip mining, creeps closer to his house in the Ohio hills, fifteen-year-old M. C. is torn between trying to get his family away and fighting for the home they love.
Book Synopsis Developments in Geophysical Exploration Methods—4 by : A.A. Fitch
Download or read book Developments in Geophysical Exploration Methods—4 written by A.A. Fitch and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geophysical prospecting is an applied science and the range of scientific principles to be applied is very wide. In this collection of original papers, the application of many different principles is described in the search for sulphides, other metallic ores and radioactive deposits. The papers are all concerned with surface observations and cover both the theory and the practice of the methods used. In all cases the advan tages and disadvantages of the methods are described and their role in the detection of mineral deposits is discussed and placed in context. Electromagnetic methods are covered in detail, involving the use of both electric and magnetic field effects. Techniques are described involv ing observations both at a number of discrete frequencies and with continuously changing frequency. In spite of the diversity of method it is interesting to note the strong links between the papers; two chapters, for example, start from the same fundamental illustration, first published by Won, of the basic relationship between source frequency, ground con ductivity and depth of penetration. The all-important economic aspects are not forgotten and the first chapter assesses the statistics of performance and describes their use in the shaping and management of an exploration programme. The editor takes this opportunity to thank the busy men who have set aside time to write these contributions.
Book Synopsis Advances in Time-Domain Computational Electromagnetic Methods by : Qiang Ren
Download or read book Advances in Time-Domain Computational Electromagnetic Methods written by Qiang Ren and published by John Wiley & Sons. This book was released on 2022-11-15 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Time-Domain Computational Electromagnetic Methods Discover state-of-the-art time domain electromagnetic modeling and simulation algorithms Advances in Time-Domain Computational Electromagnetic Methods delivers a thorough exploration of recent developments in time domain computational methods for solving complex electromagnetic problems. The book discusses the main time domain computational electromagnetics techniques, including finite-difference time domain (FDTD), finite-element time domain (FETD), discontinuous Galerkin time domain (DGTD), time domain integral equation (TDIE), and other methods in electromagnetic, multiphysics modeling and simulation, and antenna designs. The book bridges the gap between academic research and real engineering applications by comprehensively surveying the full picture of current state-of-the-art time domain electromagnetic simulation techniques. Among other topics, it offers readers discussions of automatic load balancing schemes for DG-FETD/SETD methods and convolution quadrature time domain integral equation methods for electromagnetic scattering. Advances in Time-Domain Computational Electromagnetic Methods also includes: Introductions to cylindrical, spherical, and symplectic FDTD, as well as FDTD for metasurfaces with GSTC and FDTD for nonlinear metasurfaces Explorations of FETD for dispersive and nonlinear media and SETD-DDM for periodic/ quasi-periodic arrays Discussions of TDIE, including explicit marching-on-in-time solvers for second-kind time domain integral equations, TD-SIE DDM, and convolution quadrature time domain integral equation methods for electromagnetic scattering Treatments of deep learning, including time domain electromagnetic forward and inverse modeling using a differentiable programming platform Ideal for undergraduate and graduate students studying the design and development of various kinds of communication systems, as well as professionals working in these fields, Advances in Time-Domain Computational Electromagnetic Methods is also an invaluable resource for those taking advanced graduate courses in computational electromagnetic methods and simulation techniques.
Book Synopsis Advances in Electromagnetic Geophysical Exploration by : Jin Li
Download or read book Advances in Electromagnetic Geophysical Exploration written by Jin Li and published by Frontiers Media SA. This book was released on 2024-01-19 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electromagnetic exploration is one of the earliest and most widely used geophysical exploration techniques. Electromagnetic methods, such as magnetotelluric (MT), audio magnetotelluric (AMT), transient electromagnetic method (TEM), and controlled source electromagnetic method (CSEM), have made a great contribution to industrialization and urbanization by discovering underground deposits of various resources. Driven by the latest progress in electronics and intelligent algorithms, electromagnetic exploration is developing at a high speed. Many challenges faced by traditional geophysical methods are now solvable. Emerging sensing technology and signal processing technology greatly improves the accuracy of electromagnetic methods in many applications. At the same time, such technologies promoted the development of new geophysical theories and methods.
Book Synopsis Masters Theses in the Pure and Applied Sciences by : Wade H. Shafer
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 29 (thesis year 1984) a total of 12,637 theses titles from 23 Canadian and 202 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 29 reports theses submitted in 1984, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Book Synopsis Evaluation of Frequency-domain Electromagnetic Methods in Groundwater Exploration by : F. E. Wiegmans
Download or read book Evaluation of Frequency-domain Electromagnetic Methods in Groundwater Exploration written by F. E. Wiegmans and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time-domain Electromagnetic Methods of Exploration by : Society of Exploration Geophysicists
Download or read book Time-domain Electromagnetic Methods of Exploration written by Society of Exploration Geophysicists and published by . This book was released on 1984 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transformation of Sparse Frequency-domain Electromagnetic Data to the Time Domain by : Mark William Tippie
Download or read book Transformation of Sparse Frequency-domain Electromagnetic Data to the Time Domain written by Mark William Tippie and published by . This book was released on 1984 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Controlled Source Electromagnetic Methods in Geothermal Exploration by :
Download or read book Controlled Source Electromagnetic Methods in Geothermal Exploration written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this manuscript is to sketch the problems inherent in application of controlled source electromagnetic methods (CSEM) to geothermal exploration. Measurements have been made in both the time and frequency domains with time domain measurements currently enjoying an advantage over frequency domain measurements for shallow applications. Application of CSEM methods is impeded by natural field, electrification, geological, cultural, and topographic noise. Lateral resolution of parameters of adjacent steeply dipping bodies and vertical resolution of parameters of adjacent beds in a flatly dipping sequence are concerns with any CSEM method. Current channeling into a localized good conductor form a surrounding, overlying, or underlying conductor poses problems for the interpreter. In selecting a transmitter-receiver configuration for CSEM in a particular application, a compromise is usually achieved between such factors as domain of data acquisition, rejection of noise, resolution, current channeling, and depth of exploration. Not surprisingly there is only marginal agreement on the optimum selection of each of these variables. However, one of the more promising techniques for application in geothermal exploration is the controlled source audiomagnetotelluric method (CSAMT).
Book Synopsis Physical Model Studies of the Turam Time Domain Electromagnetic Method in Minerals Exploration by : Thomas O. Miles
Download or read book Physical Model Studies of the Turam Time Domain Electromagnetic Method in Minerals Exploration written by Thomas O. Miles and published by . This book was released on 1985 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1985 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comparison of Marine Time-domain and Frequency-domain Controlled Source Electromagnetic Methods by : Dylan Connell
Download or read book A Comparison of Marine Time-domain and Frequency-domain Controlled Source Electromagnetic Methods written by Dylan Connell and published by . This book was released on 2011 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: The frequency-domain marine controlled source electromagnetic (CSEM) method has recently become a tool in determining subsurface resistivity related to hydrocarbon formations in the deep water environment. In shallow water, this frequency-domain method is subject to airwave saturation that severely limits sensitivity to targets at depth. It has been suggested that time-domain CSEM may offer an improved resolution to these deep targets, as well as increased sensitivity to resistors in the presence of the airwave. In order to examine and test these claims, a modeling code has been developed for computing time-domain responses for layered 1D models with arbitrarily located and oriented transmitters and receivers. The code extends the open-source frequency domain code Dipole1D by efficiently computing the time-domain, step-on, and impulse responses by Fourier transformation of the frequency-domain kernels. Impulse responses are used along with pseudo-random binary sequences (PRBS) to generate synthetic time-domain data. A realistic noise model and waveform scaling effects are then applied to synthetic step-on, PRBS, and the frequency-domain SIO "Waveform D" data generated from this code. Wiener deconvolution is applied to recover impulse responses from the PRBS data, allowing for a systematic examination of the sensitivity and resolution of time-domain and frequency-domain CSEM to representative targets of interest for offshore hydrocarbon exploration. These studies suggest that there is no large ad- vantage to time-domain techniques, as previously suggested, and rather that the frequency-domain Waveform D should give better results in the presence of noise for the shallow marine setting.
