Download or read book Borehole Data and Stochastic Gravimetric Inversion written by Gabriel Strykowski and published by . This book was released on 1996 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geodesy on the Move written by Rene Forsberg and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the IAG scientific assembly in Rio de Janeiro, Brazil, this volume combines papers in the fields of gravity and geoid, geodynamics, and geodesy in Antarctica. The volume contains papers on recent progress in absolute and relative gravimetry, on models of the global gravity field, theoretical developments in physical geodesy, and many examples of regional gravity field and geoid models. Geodynamics chapters include papers on earth rotation and geopotential variations, reference frames and global deformations, as well as a section on the combination of space and terrestrial methods for deformation observations. The current status of geodesy in Antarctica is illustrated by a number of papers.
Download or read book Analysis of the Gravity Field written by Fernando Sansò and published by Springer Nature. This book was released on 2022-06-09 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook presents a comprehensive treatment of the theory and implementation of inverse methods in the analysis and interpretation of Earth’s gravity field. By restricting their consideration to a local rather than global level, the authors focus on the use of observations and data that are more sensitive to local mass anomalies. All necessary theoretical aspects are reformulated in terms of a Euclidean framework so that less complex tools from mathematical analysis can be utilized. Divided into three parts, the text begins with a review of basic mathematical properties of gravitation, computing gravity from mass distributions, and relevant methods from Fourier analysis. In the second part of the text, the Earth’s gravity field and its properties are introduced, and the preprocessing and processing of gravity data are explored. Finally, elementary inverse theory is discussed, after which the general inversion problem is considered via application of both the Tikhonov deterministic approach and a stochastic MCMC model. Throughout, examples and exercises are provided to both clarify material and to illustrate real-word applications for readers. Analysis of the Gravity Field: Direct and Inverse Problems is carefully written to be accessible to both mathematicians and geophysicists without sacrificing mathematical rigor. Readers should have a familiarity with the basics of mathematical analysis, as well as some knowledge of statistics and probability theory. Detailed proofs of more advanced results are relegated to appendices so that readers can concentrate on solution algorithms.
Download or read book 3D Stochastic Inversion of Gravity Data Using Cokriging and Cosimulation written by Pejman Shamsipour and published by . This book was released on 2008 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Probabilistic Petrophysical and Compositional Interpretation of Well Logs and Core Data Via Bayesian Inversion written by Tianqi Deng and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A critical component of Formation Evaluation is the estimation of in situ petrophysical properties and solid/fluid composition of rocks from multiple well logs and core laboratory measurements. Commercial software solutions abound; they typically use linear/quasi-linear multi-mineral analysis to calculate the concentrations of rock solid/fluid constituents from multiple well logs. However, these methods are often susceptible to abnormal borehole and geometrical conditions such as layer-boundary effects and instrument/borehole-related biases. Moreover, conventional multi-mineral analysis rarely includes uncertainty quantification, much less assessing the impact of measurement noise, abnormal borehole conditions, and inaccurate rock-physics models (RPM) on the calculated rock fluid/solid concentrations. The objective of this dissertation is to develop a general probabilistic interpretation method for estimating in situ petrophysical/compositional properties of rocks from well logs and core data. It consists of two sequential Bayesian inversion steps: First, borehole measurements (e.g., density, resistivity, and gamma ray) are “deconvolved” into a layer-by-layer earth model with associated uncertainty via separate well-log inversion. Second, inverted earth-model physical properties are used to estimate volumetric concentrations of fluid and solid rock constituents via petrophysical joint inversion. In each step, Bayesian inversion implements Markov chain Monte Carlo (MCMC) and outputs an ensemble of earth models. Final interpretation results incorporate field-specific a priori knowledge and uncertainty due to measurement noise, instrument/borehole-related biases, and RPM errors. Additionally, a gradient-based MCMC method is introduced for separate well-log inversion to improve the computational efficiency of the probabilistic estimation method. The gradient-based MCMC implements a Gauss-Newton algorithm with Hessian-based sampling to draw samples efficiently from the posterior probability distribution. Compared to the standard random-walk MCMC method, gradient-based MCMC inversion decreases the computational time by more than 90%. A pre-computed surrogate model is also introduced for the rapid calculation of nuclear properties based on radial basis function (RBF) interpolation, which entails ~0.1% of the computational time compared to performing full nuclear-property calculations with less than 0.1% relative error. Finally, the probabilistic inversion method is applied to the interpretation of well logs acquired in multiple neighboring wells. After the mitigation of borehole environmental effects, the inverted earth model is instrument/borehole-independent, allowing a common baseline to effectively compare rock properties across the various wells and detect common rock classes. This procedure also enables the implementation of RPMs and prior compositional models calibrated per rock class to match core laboratory and/or advanced borehole measurements available in a few key wells. The calibrated RPMs and priors are readily implemented in nearby wells penetrating the same rock formations but with a limited number of well logs. The developed multi-well interpretation method is verified using synthetic examples with challenging geological conditions, including thin laminations, significant property contrasts, deep mud-filtrate invasion, complex rock constituents, and various logging instrumental designs (e.g., laterolog vs. induction resistivity). Successful field applications are also documented for the petrophysical interpretation of thinly-laminated shaly sandstones and unconventional organic-shale formations. Results confirm that the probabilistic interpretation method yields more accurate petrophysical estimations compared to the conventional multi-mineral analysis method. Estimated petrophysical and compositional properties and their uncertainty are in good agreement with both core laboratory measurements and interpreted elemental capture spectroscopy logs
Download or read book Travaux written by International Association of Geodesy and published by . This book was released on 1995 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Exploratory Potential Methods in Geothermal Power Generation written by Willi Freeden and published by Springer Nature. This book was released on 2024 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides the geoscientific context, that arises in gravimetric/magnetometric exploration. It essentially uses mathematics as a key technology for modeling issues on the basis of analysis and interpretation according to dense and precise gravitational/magnetic measurements. It is dedicated to surface and deep geology with potential data primarily of terrestrial origin. The book spans the interdisciplinary arc from geoengineering, especially geodesy, via geophysics to geomathematics and geology, and back again. It presents the recently published pioneering and groundbreaking multiscale mollifier methodologies realizing the bridging transfer from gravitational/magnetic measurements to approximative/numerical mollifier wavelet decorrelations with novel geologic prospects and layer-structure determination as outcome. Using the specific example of the German Saarland region, new important fields of application, especially for areas with mining-related cavities, will be opened up and subjected to an in-depth geologic detection.
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:
Download or read book 25 Years of Plate Tectonics written by David Wright Collinson and published by . This book was released on 1998 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integration of Borehole Data in Geophysical Inversion Using Fuzzy Clustering written by Duy Thong Kieu and published by . This book was released on 2018 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Applying Eye movement Tracking for the Study of Map Perception and Map Design written by Lars Brodersen and published by . This book was released on 2002 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The CD-ROM contains the verbal protocols and the MapObs-software with eye-movement films including speech of all subjects and all questions. All speech is in the Danish language.
Download or read book Minimum structure Borehole Gravity Inversion written by Craig R. W. Mosher and published by . This book was released on 2009 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inversion of Geothermal Parameters Using Borehole and Core Data written by Andreas Hartmann and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Current Geographical Publications written by University of Wisconsin--Milwaukee. Library and published by . This book was released on 1997 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current Geographical Publications (CGP) is a non-profit service to the scholarly community initiated in 1938 by the American Geographical Society of New York. Beginning in 2006, the format changed to include the tables of contents of current geographical journals. The journal titles listed link to web pages or PDF scans of the current issue's contents.
Download or read book Application of Linear Inverse Theory to Borehole Gravity Data written by and published by . This book was released on 1991 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traditional borehole gravity interpretations are based upon an earth model which assumes horizontal, laterally infinite, uniformly thick, and constant density layers. I apply discrete stabilized linear inverse theory to determine the density distribution directly from borehole gravity observations that have been corrected for drift, tide, and terrain. The stabilization is the result of including a priori data about the free-air gradient and the density structure in the inversion process. The discrete generalized linear inverse approach enables one to solve for a density distribution using all of the borehole gravity data. Moreover, the data need not be free-air corrected. An important feature of the approach is that density estimates are not required to be density averages between adjacent borehole gravity observations as in the traditional method. This approach further permits the explicit incorporation of independent density information from gamma-gamma logging tools or laboratory core measurements. Finally, explicit linear constraints upon the density and/or free-air gradient can also be handled. The non-uniqueness of the density structure determined by the inversion process is represented in a resolution matrix. 12 refs., 11 figs.
Download or read book Physics and Chemistry of the Earth written by and published by . This book was released on 2000 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
