Calculation of gravity anomalies of 3D sources using drillhole density data

摘要: Abstract The method whereby the gravity anomaly of three-dimensional sources is calculated using a combination analytical and numerical integration can be generalized for models where upper lower surfaces source vary arbitrarily its density variation defined by vertical polynomes fitted to measured values drillhole samples in area. This permits modelling of, example, folded varies three dimensions region. At first stage interpretation, distribution between drillholes determined as weighted average surrounding densities. difference from this model then used calculate new theoretical distributions fictitious area real drillholes. One use those points also guiding location future holes, instance, ore prospecting or oil drilling. By keeping constant fitting area, we perform 'semi-geometric' without making any priori assumptions concerning geometry source. equally well applicable magnetic modelling.