engleski

System Architecture for 3D Gravity Modelling

A flexible software architecture for gravity modelling is established and the advantage is discussed of having several alternative programs to handle complex 3D models. The flexible architecture consists of four parts, implemented in a distributed computer environment: the three-dimensional model builders and visualizers (GOCAD software, version 7.0), the model representation translators (GOCAD software or GEOMOD software), the forward simulation algorithms of gravimetric data (applying Talwani-Ewing and Götze-Lahmeyer methods in the finite-element representation class), and the inversion (model updating) scheme manager based on the Cordell-Henderson inversion procedure. A good software architecture should at least keep the model building and updating software separate from the forward simulation software. Inversion schemes can then be realized by communication between the two parts of software. Several synthetic cases are shown to demonstrate the use and the capability of the architecture and methods applied. The gravity fields of complex 3D models, i.e. overhanging and non-overhanging salt domes, are simulated. The gravimetric anomalies for both cases have got very similar shapes. Gravity modelling can distinguish these cases, because the existing mass differences result in anomaly differences both for surface profiles and for X-section. The capability of the inversion procedure is also shown on the enclosed synthetic case. The inversion manager is able to create the global structural forms represented as a horizon with constant density contrast (a two-layer model) from residual gravity anomalies.

gravity modelling; complex models; software architecture

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