Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Interpretation of self-potential anomaly over a 2D inclined structure using very fast simulated-annealing global optimization; an insight about ambiguity

Shashi Prakash Sharma and Arkoprovo Biswas
Interpretation of self-potential anomaly over a 2D inclined structure using very fast simulated-annealing global optimization; an insight about ambiguity (in Assessing uncertainty in geophysical problems, Aime Fournier (prefacer), Klaus Mosegaard (prefacer), Henning Omre (prefacer), Malcolm Sambridge (prefacer) and Luis Tenorio (prefacer))
Geophysics (May 2013) 78 (3): WB3-WB15

Abstract

A very fast simulated-annealing (VFSA) global optimization procedure is developed for the interpretation of self-potential (SP) anomaly measured over a 2D inclined sheet-type structure. Model parameters such as electric current dipole density (k), horizontal and vertical locations of the center of the causative body (x (sub o) and h), half-width (a), and polarization/inclination angle (a) of the sheet are optimized. VFSA optimization yields a large number of well-fitting solutions in a vast model space. Even though the assumed model space (minimum and maximum limits for each model parameter) is appropriate, it has been observed that models obtained by the VFSA process in the predefined model space could also be geologically erroneous. This offers new insight into the interpretation of self-potential data. Our optimization results indicate that there exist at least two sets of solutions that can fit the observed data equally well. The first set of solutions represents a local optimum and is geologically inappropriate. The second set of solutions represents the actual subsurface structure. The mean model estimated from the latter models represents the global solution. The efficacy of the developed approach has been demonstrated using various synthetic examples. Field data from the Surda area of Rakha Mines, India and the Bavarian woods, Germany are also interpreted. The computation time for finding this versatile solution is very short (52 s on a simple PC) and the proposed approach is found to be more advantageous than other approaches.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 78
Serial Issue: 3
Title: Interpretation of self-potential anomaly over a 2D inclined structure using very fast simulated-annealing global optimization; an insight about ambiguity
Title: Assessing uncertainty in geophysical problems
Author(s): Sharma, Shashi PrakashBiswas, Arkoprovo
Author(s): Fournier, Aimeprefacer
Author(s): Mosegaard, Klausprefacer
Author(s): Omre, Henningprefacer
Author(s): Sambridge, Malcolmprefacer
Author(s): Tenorio, Luisprefacer
Affiliation: IIT Kharagpur, Department of Geology and Geophysics, Kharagpur, India
Affiliation: Schlumberger, Houston, TX, United States
Pages: WB3-WB15
Published: 20130501
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 43
Accession Number: 2013-055718
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
Secondary Affiliation: Technical University of Denmark, DNK, DenmarkNorwegian University of Science and Technology, NOR, NorwayAustralian National University, AUS, AustraliaColorado School of Mines, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201334
Close Modal

or Create an Account

Close Modal
Close Modal