Nugroho Prasetyo, Ruhul Firdaus, Gestin Mey Ekawati
Developing a software to do gravity 3D forward modelling takes several steps. The most important steps are model parameterization, model geometry selection and calculation of the response of the given model. The complex nature of the subsurface geometry in 3D can be decomposed into discrete grid models of simple, rectangular prism-shaped body. Rectangular prisms are selected because they do not cause any gaps (density blanks) in the model while they are arranged next to each other. These prisms are then addressed using density contrast values to replicate complex anomalous geophysical properties. Our 3D model is obtained by connecting several 2D vertical-section models in the mean of interpolation. We have also added the topography to get closer to the real-world application in rough terrains or shallow targets. To ensure the level of accuracy of the software we made, a number of numerical approaches (Nagy, Plouff, Sorokin, and Okabe) for the rectangular prism model were tested through validation. Validation is done by comparing the numerical computation with the analytic calculation results of gravity responses from a single, homogeneous rectangular prism density model. We tested prototypes of the software by calculating the responses of simple geological models such as horizontal layers, normal- and thrust-faulted layers, and folded layers forming anticlines and synclines. The experiments show geophysically realistic and accurate responses, even though they still suffer from edge effects. © 2023 Author(s).
Geophysical Engineering, Institut Teknologi Sumatera, South Lampung, Indonesia
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