ANALYSIS AND MODELLING OF SUBSURFACE STRUCTURES WITH 3D INVERSION OF GRAVITY DATA USING FRAMEWORK OPEN SOURCE SIMPEG
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Abstract
The gravity method is a geophysical exploration method based on measuring differences in gravity values caused by variations in density laterally under the earth's surface. Mapping using the gravity method can be utilized to obtain a representation of subsurface geological conditions based on density variations. In this research, the inversion process of subsurface models in geothermal areas is carried out, especially in the case of enhanced geothermal system development. Processing of gravity data is
done by utilizing Python-based programming language to grid data and interpolation with ordinary kriging and spline interpolation methods. The results of the data interpolation will be compared to obtaining the best model based on the distribution of measurement points that can be used in Utah FORGE data, USA. The 3D gravity inversion process is performed by utilizing the discretize library and SimPEG to provide an overview of the source of subsurface anomalies with gravity data. Modeling was performed using synthetic data as a test of the inversion process and Utah FORGE field CBA data. The inversion results will be interpreted by correlating geological data to validate the interpretation results.
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