Quasi-2D Resistivity Model from Inversion of Vertical Electrical Sounding (VES) Data using Guided Random Search Algorithm

Diky Irawan; Hendra Grandis; Prihadi Sumintadiredja

doi:10.5614/j.math.fund.sci.2015.47.3.5

Authors

Diky Irawan Graduate Program in Geophysical Engineering, Institut Teknologi Bandung Jalan Ganesha 10, Bandung, 40132, Indonesia
Hendra Grandis Graduate Program in Geophysical Engineering, Institut Teknologi Bandung Jalan Ganesha 10, Bandung, 40132, Indonesia Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung Jalan Ganesha 10, Bandung, 40132, Indonesia
Prihadi Sumintadiredja Faculty of Earth Science and Technology, Institut Teknologi Bandung Jalan Ganesha 10, Bandung, 40132, Indonesia

DOI:

https://doi.org/10.5614/j.math.fund.sci.2015.47.3.5

Keywords:

2D model, DC resistivity, global search, Monte Carlo method, non-linear inversion.

Abstract

Vertical electrical sounding (VES) data are usually interpreted in terms of a 1D resistivity model using linearized inversion. The local approach of a non-linear inverse problem has fundamental limitations, i.e. the necessity of a starting model close to the solution and possible convergence to a local rather than a global minimum solution. We studied the application of a global search approach for non-linear inversion using the guided random search method to model VES data. A quasi-2D resistivity model can be created by stitching 1D models obtained from VES data along a profile. Both vertical and lateral resistivity variations are minimized to incorporate a 2D smoothness constraint. The proposed method was applied to invert synthetic VES data as well as field data from a sedimentary environment. Both synthetic and field data inversions resulted in models that correlated well with the known synthetic model and with the geology of the study area, respectively.

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