Finite element modelling of IP anomalous effect from bodies of any shape located in rugged relief area
msra(2000)
摘要
Finite element modelling of geoelectrical sections is carried out in two cases: (a) Ore bodies with a massive texture and an electrical resistivity in contrast with the resistivity of the surrounding rocks, where 2.5D modelling is applied; (b) Ore bodies with a disseminated texture having no contrast of resistivity with the surrounding rocks, where 3D models are under use. Two parameters characterize the constructed model - the apparent resisitivity and the induced polarization. The effect of the relief as well as of the global geological structure is taken into account. Case studies shown demonstrate different effects and usability of the modelling by finite elements. The results of such a modelling are presented according to a new method of "geoelectrical real section", proposed by Perparim Alikaj, and developed recently in QUANTEQ IP Inc., Canada. They are a synthesis of many year's works of the authors in collaboration with this company in a number of projects. INTRDUCTION Resolving geophysical problems means a finite iteration of the couple interpretation ↔ modelling. Theoretical models exist for a number of ideal cases, rarely found in nature. The problem becomes more complicated when the depth of investigation increases, together with an increase in the secondary effects caused by the relief and the geological inhomogeneity in depth. In this paper the problem of modelling geoelectrical real sections is treated using finite elements to solve elliptic equations in a heterogeneous medium related to complex geological situations and rugged relief. This procedure is used both for resistivity and IP modelling.
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关键词
realsection,resistivity modelling,ip modelling,finite element modelling,finite element,elliptic equation,electrical resistance,induced polarization
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