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Volume :15 Issue : 2 1988      Add To Cart                                                                    Download

Separation of residual from Bouguer gravity data measured over a deep sedimentary basin, western Sudan

Auther : HAMID O. ALI

Department of Geology. University of Kuwait, P.O. Box 5969. Safat 13060. Kuwait

 

ABSTRACT

 

Methods of regional-residual separation, including graphical smoothing, polynomial trend surface analysis, upward continuation and 2-D wavenumber filtering, were employed to separate the residual anomalies from gravity data measured over a deep sedimentary basin in western Sudan. The objective was to obtain a residual gravity map suitable for quantitative modelling of the geometry of the basin, in connection with a search for deep groundwater sources.

Upward continuation and 2-D wave number filtering results show some common features, but they do not satisfactorily define the shape of the basin. The residual gravity values obtained in this way can only be interpreted in terms of very shallow sources, which might be the superficial deposits. On the other hand, residual gravity maps obtained by graphical smoothing and polynomial trend surface define the shape of the basin clearly and show a general similarity, although there is significant offset in gravity values.

 

When correlated with surface geology and information from drilled holes, only the graphical smoothing residual gravity map meets the objective of quantitative modelling, with an assumption that the whole residual is produced by the sedimentary fill.

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