TY - JOUR

T1 - Joint parameter estimation from magnetic resonance and vertical electric soundings using a multi-objective genetic algorithm

AU - Akca, Irfan

AU - Günther, Thomas

AU - Müller-Petke, Mike

AU - Başokur, Ahmet T.

AU - Yaramanci, Ugur

PY - 2014/3

Y1 - 2014/3

N2 - Magnetic resonance sounding (MRS) has increasingly become an important method in hydrogeophysics because it allows for estimations of essential hydraulic properties such as porosity and hydraulic conductivity. A resistivity model is required for magnetic resonance sounding modelling and inversion. Therefore, joint interpretation or inversion is favourable to reduce the ambiguities that arise in separate magnetic resonance sounding and vertical electrical sounding (VES) inversions. A new method is suggested for the joint inversion of magnetic resonance sounding and vertical electrical sounding data. A one-dimensional blocky model with varying layer thicknesses is used for the subsurface discretization. Instead of conventional derivative-based inversion schemes that are strongly dependent on initial models, a global multi-objective optimization scheme (a genetic algorithm [GA] in this case) is preferred to examine a set of possible solutions in a predefined search space. Multi-objective joint optimization avoids the domination of one objective over the other without applying a weighting scheme. The outcome is a group of non-dominated optimal solutions referred to as the Pareto-optimal set. Tests conducted using synthetic data show that the multi-objective joint optimization approximates the joint model parameters within the experimental error level and illustrates the range of trade-off solutions, which is useful for understanding the consistency and conflicts between two models and objectives. Overall, the Levenberg-Marquardt inversion of field data measured during a survey on a North Sea island presents similar solutions. However, the multi-objective genetic algorithm method presents an efficient method for exploring the search space by producing a set of non-dominated solutions. Borehole data were used to provide a verification of the inversion outcomes and indicate that the suggested genetic algorithm method is complementary for derivative-based inversions.

AB - Magnetic resonance sounding (MRS) has increasingly become an important method in hydrogeophysics because it allows for estimations of essential hydraulic properties such as porosity and hydraulic conductivity. A resistivity model is required for magnetic resonance sounding modelling and inversion. Therefore, joint interpretation or inversion is favourable to reduce the ambiguities that arise in separate magnetic resonance sounding and vertical electrical sounding (VES) inversions. A new method is suggested for the joint inversion of magnetic resonance sounding and vertical electrical sounding data. A one-dimensional blocky model with varying layer thicknesses is used for the subsurface discretization. Instead of conventional derivative-based inversion schemes that are strongly dependent on initial models, a global multi-objective optimization scheme (a genetic algorithm [GA] in this case) is preferred to examine a set of possible solutions in a predefined search space. Multi-objective joint optimization avoids the domination of one objective over the other without applying a weighting scheme. The outcome is a group of non-dominated optimal solutions referred to as the Pareto-optimal set. Tests conducted using synthetic data show that the multi-objective joint optimization approximates the joint model parameters within the experimental error level and illustrates the range of trade-off solutions, which is useful for understanding the consistency and conflicts between two models and objectives. Overall, the Levenberg-Marquardt inversion of field data measured during a survey on a North Sea island presents similar solutions. However, the multi-objective genetic algorithm method presents an efficient method for exploring the search space by producing a set of non-dominated solutions. Borehole data were used to provide a verification of the inversion outcomes and indicate that the suggested genetic algorithm method is complementary for derivative-based inversions.

KW - Parameter estimation

KW - Petrophysics

KW - Resistivity

UR - http://www.scopus.com/inward/record.url?scp=84893696614&partnerID=8YFLogxK

U2 - 10.1111/1365-2478.12082

DO - 10.1111/1365-2478.12082

M3 - Article

AN - SCOPUS:84893696614

VL - 62

SP - 364

EP - 376

JO - Geophysical prospecting

JF - Geophysical prospecting

SN - 0016-8025

IS - 2

ER -