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Author :
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (727 download)
Download or read book A Fast Inversion Method for Interpreting Borehole Electromagnetic Data written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michal Kolaj
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (124 download)
Download or read book Novel Electromagnetic Surveying and Interpretation Methods for Improved Near Surface Characterization and Deep Exploration written by Michal Kolaj and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Inductive electromagnetic (EM) geophysical methods are often applied and their data processed for two different purposes. One is to create images of the distribution of electrical conductivity of the subsurface while the second is to derive simple robust physical estimates of the location, size and attributes of discrete conductors. In order to improve both the ability to efficiently image the subsurface and to derive simple robust physical properties of discrete conductors, several surveying methods and interpretation algorithms have been developed. To improve the lateral near-surface resolution of thin conductors, such as overburden, nickel laterites and mine waste, two interpretation methods were developed which rely on the measurement of the vertical spatial derivative of the time-varying magnetic field. The first method does not require grid or line data, but, is less accurate than the second inversion method when the spatial gradient of the resistance is strong and/or when the horizontal magnetic fields are large. When applied to data collected over an old mine tailings pond, the two methods produced similar high resolution maps of the conductance. For both shallow and deep exploration a simple and robust conductance estimation method for borehole EM data was developed. The method relies on the calculation of the vertical spatial derivative of the magnitude of the magnetic field using adjacent down-hole stations. In a field trial, a reliable conductance was calculated for two deep sulfide bodies. To improve the resolution of EM surveying, a multi-transmitter surveying processing method was developed. Individual targets are highlighted by calculating a weighted-sum of the multiple transmitter data and the method is shown to produce high signal-to-noise ratio data for high finesse surveys in complex conductor environments where many transmitter-to-target coupling angles are required and/or for deep focused exploration. A field example over an offset dyke located in the Sudbury Basin showcased the ability of the surveying and processing method to determine the location and orientation of a sulfide body. To provide geoscientists with low-cost and efficient interpretation tools, a fast approximate 3D inversion for fixed-loop surface data was developed. The method solves for the causative subsurface current system which is approximated with a 3D subsurface grid of 3D magnetic (closed loop current) or electric (current element) dipoles. Ground data from a deep massive sulfide body was inverted and the results were consistent with existing interpretation and a second example over a near-surface mine tailings pond highlighted the strength of being able to invert magnetic field data using either magnetic or electric dipoles.
Author : J. Bee Bednar
Publisher : SIAM
ISBN 13 : 9780898712735
Total Pages : 472 pages
Book Rating : 4.7/5 (127 download)
Download or read book Geophysical Inversion written by J. Bee Bednar and published by SIAM. This book was released on 1992-01-01 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of papers on geophysical inversion contains research and survey articles on where the field has been and where it's going, and what is practical and what is not. Topics covered include seismic tomography, migration and inverse scattering.
Author : Hung-Wen Tseng
Publisher :
ISBN 13 :
Total Pages : 306 pages
Book Rating : 4.:/5 (34 download)
Download or read book Three-dimensional Interpretation of Borehole-to Surface Electromagnetic Data written by Hung-Wen Tseng and published by . This book was released on 1999 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Arkoprovo Biswas
Publisher : Springer Nature
ISBN 13 : 3030289095
Total Pages : 414 pages
Book Rating : 4.0/5 (32 download)
Download or read book Advances in Modeling and Interpretation in Near Surface Geophysics written by Arkoprovo Biswas and published by Springer Nature. This book was released on 2020-01-01 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals primarily with the aspects of advances in near surface geophysical data modeling, different interpretation techniques, new ideas and an integrated study to delineate the subsurface structures. It also involves the practical application of different geophysical methods to delineate the subsurface structures associated with mineral, groundwater exploration, subsurface contamination, hot springs, coal fire etc. This book is specifically aimed with the state-of-art information regarding research advances and new developments in these areas of study, coupled to extensive modeling and field investigations obtained from around the world. It is extremely enlightening for the research workers, scientists, faculty members and students, in Applied Geophysics, Near Surface Geophysics, Potential Field, Electrical and Electromagnetic Methods, Mathematical Modeling Techniques in Earth Sciences, as well as Environmental Geophysics.
Author : Michael John Batiste Tompkins
Publisher :
ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.:/5 (89 download)
Download or read book Quantitative Analysis of Muli-component Borehole Electromagnetic Induction Responses Using Anisotropic Forward Modeling and Inversion written by Michael John Batiste Tompkins and published by . This book was released on 2003 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jianzhong Zhang
Publisher : Frontiers Media SA
ISBN 13 : 2832533620
Total Pages : 175 pages
Book Rating : 4.8/5 (325 download)
Download or read book Joint inversion and imaging in geophysics written by Jianzhong Zhang and published by Frontiers Media SA. This book was released on 2023-09-08 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Siddharth Misra
Publisher : Elsevier
ISBN 13 : 0128214554
Total Pages : 382 pages
Book Rating : 4.1/5 (282 download)
Download or read book Multifrequency Electromagnetic Data Interpretation for Subsurface Characterization written by Siddharth Misra and published by Elsevier. This book was released on 2021-07-13 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multifrequency Electromagnetic Data Interpretation for Subsurface Characterization focuses on the development and application of electromagnetic measurement methodologies and their interpretation techniques for subsurface characterization. The book guides readers on how to characterize and understand materials using electromagnetic measurements, including dielectric permittivity, resistivity and conductivity measurements. This reference will be useful for subsurface engineers, petrophysicists, subsurface data analysts, geophysicists, hydrogeologists, and geoscientists who want to know how to develop tools and techniques of electromagnetic measurements and interpretation for subsurface characterization. Includes case studies to add additional color to the presented content Provides codes for the mechanistic modeling of multi-frequency conductivity and relative permittivity of porous geomaterials Presents detailed descriptions of multifrequency electromagnetic data interpretation models and inversion algorithm
Author : Misac N. Nabighian
Publisher : SEG Books
ISBN 13 : 1560800224
Total Pages : 989 pages
Book Rating : 4.5/5 (68 download)
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.
Author : Michael S Zhdanov
Publisher : Elsevier
ISBN 13 : 0444638911
Total Pages : 806 pages
Book Rating : 4.4/5 (446 download)
Download or read book Foundations of Geophysical Electromagnetic Theory and Methods written by Michael S Zhdanov and published by Elsevier. This book was released on 2017-10-26 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foundations of Geophysical Electromagnetic Theory and Methods, Second Edition, builds on the strength of the first edition to offer a systematic exposition of geophysical electromagnetic theory and methods. This new edition highlights progress made over the last decade, with a special focus on recent advances in marine and airborne electromagnetic methods. Also included are recent case histories on practical applications in tectonic studies, mineral exploration, environmental studies and off-shore hydrocarbon exploration. The book is ideal for geoscientists working in all areas of geophysics, including exploration geophysics and applied physics, as well as graduate students and researchers working in the field of electromagnetic theory and methods. Presents theoretical and methodological foundations of geophysical field theory Synthesizes fundamental theory and the most recent achievements of electromagnetic (EM) geophysical methods in the framework of a unified systematic exposition Offers a unique breadth and completeness in providing a general picture of the current state-of-the-art in EM geophysical technology Discusses practical aspects of EM exploration for mineral and energy resources
Author : Shan Huang (Ph. D.)
Publisher :
ISBN 13 :
Total Pages : 408 pages
Book Rating : 4.:/5 (923 download)
Download or read book Fast Forward Modeling and Inversion of Borehole Sonic Measurements Using Spatial Sensitivity Functions written by Shan Huang (Ph. D.) and published by . This book was released on 2015 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Borehole sonic measurements are widely used by petrophysicists to estimate in-situ dynamic elastic properties of rock formations. The estimated formation properties typically guide the interpretation of seismic amplitude measurements in the exploration and development of hydrocarbon reservoirs. Due to limitations in vertical resolution, borehole sonic measurements (sonic logs) provide spatially averaged values of formation properties in thinly bedded rocks. In addition, mud-filtrate invasion and near-wellbore formation damage can bias the elastic properties estimated from sonic logs. The interpretation of sonic logs in high angle (HA) and horizontal (HZ) wells is even more challenging because of three-dimensional geometrical effects and anisotropy. A reliable approach to account for geometrical effects in the interpretation of sonic logs is the implementation of forward modeling and inversion techniques. However, the computation time required to model the direct problem, namely wave propagation in the borehole environment, severely constraints the usage of inversion approaches in sonic-log interpretation. This dissertation develops new methods for the rapid simulation of sonic logs using the concept of spatial sensitivity functions. Sonic spatial sensitivity functions are equivalent to the Green's function of a particular sonic measurement; they also serve as weighting matrices to map formation elastic properties into the respective measurement space. Application of sensitivity functions to challenging synthetic examples verifies that the maximum relative error in the modeled sonic logs is lower than 3% for flexural, Stoneley, and compressional (P-) and shear (S-) modes. Compared to rigorous numerical simulations, the new fast sonic modeling method reduces computation time by 98%. Using the fast sonic simulation algorithm, we develop an inversion method that combines multi-frequency flexural dispersion and P- and S- mode slowness logs to estimate layer-by-layer compressional and shear slownesses of rock formations. Synthetic verification examples as well as interpretation of field cases indicate that the estimated formation compressional and shear slownesses are within 3% of true model properties, exhibiting a maximum uncertainty of 6%. When compared to conventional sonic-log interpretation, the new inversion-based method effectively reduces shoulder-bed effects and relative errors in estimated properties by 15%, while the vertical resolution of sonic logs is improved from 1.83 m to 0.5 m. Finally, we show that multi-mode wave interference in HA/HZ wells makes it difficult to identify the low-frequency slowness asymptote of the flexural mode. We extend the sensitivity method to three dimensions to approach this latter problem and to model high-frequency dispersion logs. Because the calculated P-mode slowness log exhibits strong dependence to processing parameters, conventional waveform semblance-based processing becomes inadequate in HA wells. We introduce a new P-arrival slowness log to circumvent wave mode interference and to avoid semblance calculations. Additionally, we also develop a one-dimensional integration method to rapidly model P-arrival slowness logs when HA/HZ wells penetrate anisotropic thin beds. The fast modeling algorithm generates synthetic logs that match sonic logs simulated with rigorous modeling procedures within 5% while providing a 99% reduction in computation time.
Author : M.M. Poulton
Publisher : Elsevier
ISBN 13 : 0080529658
Total Pages : 351 pages
Book Rating : 4.0/5 (85 download)
Download or read book Computational Neural Networks for Geophysical Data Processing written by M.M. Poulton and published by Elsevier. This book was released on 2001-06-13 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was primarily written for an audience that has heard about neural networks or has had some experience with the algorithms, but would like to gain a deeper understanding of the fundamental material. For those that already have a solid grasp of how to create a neural network application, this work can provide a wide range of examples of nuances in network design, data set design, testing strategy, and error analysis. Computational, rather than artificial, modifiers are used for neural networks in this book to make a distinction between networks that are implemented in hardware and those that are implemented in software. The term artificial neural network covers any implementation that is inorganic and is the most general term. Computational neural networks are only implemented in software but represent the vast majority of applications. While this book cannot provide a blue print for every conceivable geophysics application, it does outline a basic approach that has been used successfully.
Author :
Publisher :
ISBN 13 :
Total Pages : 578 pages
Book Rating : 4.:/5 (319 download)
Download or read book Geological Survey Professional Paper written by and published by . This book was released on 1980 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael S Zhdanov
Publisher : Elsevier
ISBN 13 : 0080931766
Total Pages : 869 pages
Book Rating : 4.0/5 (89 download)
Download or read book Geophysical Electromagnetic Theory and Methods written by Michael S Zhdanov and published by Elsevier. This book was released on 2009-06-12 with total page 869 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book the author presents the state-of-the-art electromagnetic (EM)theories and methods employed in EM geophysical exploration.The book brings together the fundamental theory of EM fields and the practicalaspects of EM exploration for mineral and energy resources.This text is unique in its breadth and completeness in providing anoverview of EM geophysical exploration technology. The book is divided into four parts covering the foundations of EMfield theory and its applications, and emerging geophysical methods.Part I is an introduction to the field theory required for baselineunderstanding. Part II is an overview of all the basic elements ofgeophysical EM theory, from Maxwell's fundamental equations to modernmethods of modeling the EM field in complex 3-D geoelectrical formations. Part III deals with the regularized solution of ill-posedinverse electromagnetic problems, the multidimensional migration and imaging ofelectromagnetic data, and general interpretation techniques. Part IV describes major geophysical electromagnetic methods—direct current (DC), induced polarization (IP), magnetotelluric(MT), and controlled-source electromagnetic (CSEM) methods—and covers different applications of EM methods in exploration geophysics, includingminerals and HC exploration, environmental study, and crustal study. Presents theoretical and methodological findings, as well as examples of applications of recently developed algorithms and software in solving practical problems Describes the practical importance of electromagnetic data through enabling discussions on a construction of a closed technological cycle, processing, analysis and three-dimensional interpretation Updates current findings in the field, especially with MT, magnetovariational and seismo-electrical methods and the practice of 3D interpretations
Author : Andrew Binley
Publisher : Cambridge University Press
ISBN 13 : 1108492746
Total Pages : 409 pages
Book Rating : 4.1/5 (84 download)
Download or read book Resistivity and Induced Polarization written by Andrew Binley and published by Cambridge University Press. This book was released on 2020-12-17 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive text on resistivity and induced polarization covering theory and practice for the near-surface Earth supported by modelling software.
Author :
Publisher :
ISBN 13 :
Total Pages : 580 pages
Book Rating : 4.3/5 (91 download)
Download or read book U.S. Geological Survey Professional Paper written by and published by . This book was released on 1980 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Max A. Meju
Publisher : SEG Books
ISBN 13 : 156080257X
Total Pages : 305 pages
Book Rating : 4.5/5 (68 download)
Download or read book Geophysical Data Analysis: Understanding Inverse Problem Theory and Practice written by Max A. Meju and published by SEG Books. This book was released on 1994 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication is designed to provide a practical understanding of methods of parameter estimation and uncertainty analysis. The practical problems covered range from simple processing of time- and space-series data to inversion of potential field, seismic, electrical, and electromagnetic data. The various formulations are reconciled with field data in the numerous examples provided in the book; well-documented computer programmes are also given to show how easy it is to implement inversion algorithms.
