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A large array of inselbergs on a continuation of the sub-Cambrian peneplain in the Baltic Basin : evidence from seismic data, Wes ern Lithuania

Grendaité Milda, Michelevičius Dainius, Radzevičius Sigitas

Geological Quarterly

2022

Vol. 66, No. 1

art. no. 2

The sub-Cambrian peneplain is well-known in Scandinavia, outcropping in Finland, Sweden and Norway. This peneplain is thought to have formed within the Baltic Sea region in Cryogenian and Ediacaran/early Cambrian time, when Baltica, a part of Rodinia for most of that time, experienced tectonic stability, strong sheet-wash weathering and glaciations. While the peneplain outcrops in the Baltic Shield region, it continues beneath Phanerozoic strata of the Baltic Basin. This buried part of the sub-Cambrian peneplain is known to have several isolated inselbergs. We interpret newly acquired 2D and 3D seismic data and show that the sub-Cambrian peneplain extends at least to Western Lithuania where the palaeotopography of the Precambrian basement changes its character from peneplain-like flat to hilly terrain with a large array of inselbergs. Even though some of the largest features of this palaeotopography have been known before, they are here demonstrated for the first time within the regional context of the sub-Cambrian peneplain.

An evaluation of the impact of shot and receiver lines spacing on seismic data quality – the Wierzbica 3D AGH seismic experiment

Barmuta Jan, Korbecka Monika, Hadro Piotr, Pieniądz Krzysztof, Stefaniuk Michał, Dzwinel Krzysztof, Buniak Arkadiusz

Geology, Geophysics and Environment

2020

Vol. 46, no. 2

93--108

An attempt was made to describe the quality of the stacked seismic data semi-quantitatively with respect to the spacing of shot and receiver lines. The methods used included: signal-to-noise ratio calculation, seismic-to-well tie accuracy, wavelet extraction effectiveness and reliability of semi-automated interpretation of seismic attributes. This study was focused on the Ordovician-Silurian interval of the Lublin Basin, Poland, as it was considered as a main target for the exploration of unconventional hydrocarbon deposits. Our results reconfirm the obvious dependency between the density of the acquisition parameters and data quality. However, we also discovered that the seismic data quality is less affected by the shot line spacing than by comparable receiver line spacing. We attributed this issue to the fact of the higher irregularity of the shot points than receiver points, imposed by the terrain accessibility. We have also proven that the regularity of receiver and shot point distribution is crucial for the reliable interpretation of structural seismic attributes, since these were found to be highly sensitive to the acquisition geometry.