The Use of Seismic Attributes for Depth Conversion and Property Distributions, E-M Field, Offshore South Africa

2011 ◽  
Author(s):  
Laurence Ward Corbett ◽  
Jody Frewin ◽  
Claude Barthes ◽  
Thabo Clifford Kgogo ◽  
Francois Xavier Dubost ◽  
...  
Keyword(s):  
South Africa ◽  
Seismic Attributes

3D seismic attributes for structural mapping and enhancement of deep gold mining: a case study from the West Wits Line goldfields, South Africa

2018 ◽  
Vol 49 (3) ◽  
pp. 345-362 ◽  
Author(s):  
Nomqhele Z. Nkosi ◽  
Musa S. D. Manzi ◽  
Oleg Brovko ◽  
Raymond J. Durrheim
Keyword(s):  
South Africa ◽  
Gold Mining ◽  
Seismic Attributes ◽  
3D Seismic ◽  
The West ◽  
Structural Mapping

scholarly journals A combination of genetic inversion and seismic frequency attributes to delineate reservoir targets in offshore northern Orange Basin, South Africa

2020 ◽  
Vol 12 (1) ◽  
pp. 1158-1168
Author(s):  
Chris Adesola Samakinde ◽  
Jan Marinus van Bever Donker ◽  
Oluwaseun Adejuwon Fadipe
Keyword(s):  
South Africa ◽  
Instantaneous Frequency ◽  
Acoustic Impedance ◽  
Normal Fault ◽  
Seismic Attributes ◽  
Oil Field ◽  
High Porosity ◽  
Root Mean Square Amplitude ◽  
Impedance Inversion ◽  
Acoustic Impedance Inversion

AbstractThe reported occurrence of Albian- and Cenomanian-aged braided fluvio-deltaic channels in the Orange Basin, South Africa, opens a window of exploration activities to characterize these channels as they are renowned to form some of the world’s giant oil field. In this study, a seismic acoustic impedance inversion and seismic attributes (instantaneous frequency and iso-frequency) analysis is used to investigate potential Albian and Cenomanian fluvio-deltaic channels in offshore, northern Orange Basin. Reservoirs were mapped using a well and 3D seismic volume (8-bit) after initial dip-steering coherency filtering had been performed on the seismic volume to remove incoherent noise and improve data resolution. Model-based acoustic impedance inversion was applied on the seismic volume to delineate fluvio-deltaic channels in addition to using the RMS (root mean square) amplitude attribute. Iso-frequency using the cosine correlative transform (CCT) method was equally applied to delineate these channels. Instantaneous frequency attribute was analyzed for potential hydrocarbon-charged sediments. This was achieved by utilizing thirty-three seismic traces as an input in the Hilbert transform window, after which trace envelope and instantaneous phase were transformed into instantaneous frequency. Acoustic impedance inversion results reveal the presence of two channels within the Cenomanian sequence, which shows high porosity (∼40%) along its geometry. The CCT method shows that the 8 Hz frequency window resolved the presence of a channel within the Albian sequence. A meandering channel within the Albian sequence was equally delineated by the RMS, while the application of instantaneous frequency (IF) attribute indicates the presence of hydrocarbon-charged sediments of Cenomanian age in proximity to a listric normal fault because of the attenuation of frequency observed close to the fault. This study demonstrates a case study of the application of seismic impedance inversion and seismic attributes for the delineation of potential reservoirs and hydrocarbon-charged sediments in a basin.

Application of 3-D seismic attributes analysis to mine planning: Target gold deposit, South Africa

2000 ◽  
Vol 19 (7) ◽  
pp. 736-742 ◽  
Author(s):  
Graham W. Stuart ◽  
Stephen J. Jolley ◽  
Louis G. B. T. Polome ◽  
Rod F. Tucker
Keyword(s):  
South Africa ◽  
Gold Deposit ◽  
Seismic Attributes ◽  
Mine Planning

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

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