You are here

Analogue GPR study of the Permian fanglomerates from Zygmuntówka Quarry near Chęciny, Holy Cross Mountains, southern Poland, for construction of a training image for multiple point simulations

Geological Quarterly, 62(4): 755–766, doi: 10.7306/gq.438

Distribution of Permian alluvial fan lithofacies in the Zygmuntówka quarry near Chęciny, Holy Cross Mts in southern Poland has been investigated using ground penetrating radar (GPR) in order to create training images for multiple point statistics (MPS) reconstructions of alluvial fan sedimentary facies. Five pseudo-3D GPR datasets were collected, processed and uploaded for interpretation into SKUA-GOCAD 3D geological modelling software. Three radar facies were distinguished based on 3D geometrical pattern of radar reflections and linked to lithofacies described from the quarry by Zbroja et al. (1998). Statistical summary confirmed that ~50% of the lithofacies resulted from gravity flows (mostly non-cohesive), while the remaining proportion was deposited by unconfined and confined flashfloods. Fluvial sedimentary facies left by waning of catastrophic floods or reworking during fair weather, although not prevalent, could not be distinguished from confined flood deposits only based on GPR data. The GPR datasets together with information from field observations were used to carry out MPS simulations and estimate the most probable 3D model of lithofacies at the quarry scale. This model in turn will serve as a training image for MPS reconstructions of alluvial-fan facies of Rotliegend conglomerates in the multi-scale geological model of the regional structure of the Gorzów Block (western Poland).