The colour analysis method applied to homogeneous rocks

Abstract

Computer-aided colour analysis can facilitate cyclostratigraphic studies. Here we report on a case study involving the development of a digital colour analysis method for examination of the Boda Claystone Formation which is the most suitable in Hungary for the disposal of high-level radioactive waste. Rock type colours are reddish brown or brownish red, or any shade between brown and red. The method presented here could be used to differentiate similar colours and to identify gradual transitions between these; the latter are of great importance in a cyclostratigraphic analysis of the succession. Geophysical well-logging has demonstrated the existence of characteristic cyclic units, as detected by colour and natural gamma. Based on our research, colour, natural gamma and lithology correlate well. For core Ib-4, these features reveal the presence of orderly cycles with thicknesses of roughly 0.64 to 13 metres. Once the core has been scanned, this is a time- and cost-effective method.

Microstructure, Geometry and Hydrogeology of the fracture network of the Boda Claystone Formation

“…The determined correlation coefficients were significantly impacted by the lithology of the section under study. Because the rock body of the BCF showed little variation in its lithology (Halász 2009;Halász and Halmai 2015), P10 can be predicted using the above multiple linear regression function for much of the formation. However, the estimated and measured P10 values diverged more than usual at several sections in the analysed boreholes: at 750-780 m in BAF-4 and at 700-860 m in BAF-2.…”