Physical property studies to elucidate the source of seismic reflectivity within the ICDP DSeis seismogenic zone: Klerksdorp goldfield, South Africa

Petrophysical properties of cylindrical core specimens from three boreholes the International Continental Scientific Drilling Program, DSeis project, measured at ambient pressure and room temperature conditions in various laboratories are presented compared with downhole petrophysical data (sonic density). The sixty-six rock constituting metasediments, metabasalts intrusives. Seismic velocities were using 0.5 MHz P- S-wave transducers. To investigate source seismic reflectivity observed on 2D legacy data, we computed synthetic seismograms for adjacent units them reflections reflection profile. experimental measurements show that metasediments exhibit lower bulk densities than intrusive specimens. porosity was found to be less 2% all samples. No clear trends emerge when Poisson's ratio is plotted against P-wave porosities A positive relationship between modulus highest calculated coefficients (RC) associated metasediment-intrusive interfaces boreholes. intrusive-metabasalt metasediment-metabasalt low RC. Synthetic reveal strong coincide high RC density velocity data. also revealed additional not identified specimens, due loss some lithological units. Successful correlations carried out real enabling us correlate stratigraphic sequence drilled