Tagasi otsingusse
Shogenova et al., 1998

Technique and results of complex analyses to study processes in sedimentary basin (in Estonia)

Shogenova, A., Bityukova, L., Götze, H.
DOI
DOI10.1016/S0079-1946(98)00032-9
Aasta1998
AjakiriPhysics and Chemistry of the Earth
Köide23
Number3
Leheküljed327-337
Tüüpartikkel ajakirjas
Eesti autor
Keelinglise
Id19801

Abstrakt

The technique of multivariate statistical analyses was applied to the database including 25 petrophysical and geochemical parameters of 780 samples of rocks from early Paleozoic sedimentary basin in Estonia. Variations of magnetic, electrical, density and seismic properties of carbonate rocks studied together with their chemical composition were investigated by stratigraphical sequence, by Ordovician facial zones and in secondary altered fracture and fissure zones. Visualization of parameters variations and changes were performed by 2-D and 3-D models. R-mode factor analysis was applied to the six data sets including four different age rocks data sets (lower, middle, upper Ordovician and Silurian) and two ones with altered rocks from fracture and fissure zones. The first dominant factors which controlled the studied parameters were interpreted in the terms of processes. The most important groups of processes controlling the changes of petrophysical parameters were revealed: primary processes (sedimentation) and secondary alteration processes (dolomitization, fracturing, rock solution and leaching). Most of electrical, density and seismic properties of studied carbonate rocks depend on clay content, which is determined by sedimentation processes. The same properties in the fracture zone are changed with increase in secondary porosity. At least three geochemical types of dolomitization were revealed by factor analysis. In the most studied data sets dolomitization plays the second role in the parameters variations. Widespread lower Ordovician dolomitization and associated with vertical fracture zone dolomitization cause increase in magnetic properties in lower and middle Ordovician rocks.

Viimati muudetud: 8/26/2021
KIKNATARCSARVTÜ Loodusmuuseumi geokogudEesti Loodusmuuseumi geoloogia osakond
Leheküljel leiduvad materjalid on enamasti kasutamiseks CC BY-SA litsensi alusel, kui pole teisiti määratud.
Portaal on osaks teadustaristust ning infosüsteemist SARV, majutab TalTech.
Open Book ikooni autor Icons8.