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3D MT and Gravity Joint Inversion Modeling of Graben-Hosted High Temperature Geothermal Fields
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 1st Geoscience & Engineering in Energy Transition Conference, Nov 2020, Volume 2020, p.1 - 5
Abstract
Summary
Following from our recent work on joint inversion of MT, gravity, and MEQ data from the Darajat field ( Soyer et al, 2018 ), here we illustrate the pros and cons of quantitative integration of MT and gravity data through 3D joint inversion modeling, including major fault structures. We use both a 3D synthetic example as well as field survey data from the Sorik Marapi geothermal field, Sumatra. While MT results were largely similar for both single and joint domain inversions, gravity inversions – with inherently weaker depth sensitivity than MT – benefited significantly from the integration, in both cooperative and joint workflows. Additionally, by including faults as inversion regularization discontinuities, the graben boundary locations – well constrained by the gravity data – is represented faithfully. Through integrated inversion modeling of multiple geophysical data types over geothermal fields, and allowing sharp boundary structure, we achieve a multi-property 3D model that consistently explains the observations of each geophysical dataset, and should be more geologically reliable than stand-alone efforts.
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