Korelacja geofizyczna utworów kredy we wschodniej części Wyżyny Lubelskiej i na południowym Podlasiu
Abstract
GEOPHYSICAL CORRELATION OF CRETACEOUS ROCKS IN EASTERN PART OF THE LUBLIN UPLAND AND SOUTHERN PODLASIE
Summary
As it was shown by biostratigraphic studies (3, 11, 12, 13, 16 ... ), the Cretaceous is represented in south-eastern Poland (Fig. 1) by rocks ranging in age from the uppermost Lower Cretaceous (Middle and Upper Albian) to all the stages of the Upper Cretaceous, from Cenomanian to the uppermost Mastrichtian.
The Upper Cretaceous is here represented by monotonous rocks which do not form any distinct lithological complexes and they are difficult to subdivide. In turn, physical properties of these rocks are varying. On the basis of geophysical well logs, the Cretaceous is subdivided into 5 major geophysical complexes and a few correlational horizons are differentiated (Figs. 2, 3). Moreover, there are differentiated two important geophysical marker beds: horizon I B and geophysical complex IV.
The analyses of macro- and microfauna from drillings made it possible to establish general stratigraphic setting of geophysical complexes. Attention is paid to still existing differences in interpretation of some boundaries.
The paper presents brief geophysical and lithological characteristics of the geophysical complexes. The presented model (Figs. 2, 3) makes possible reliable correlation of Cretaceous rocks from borehole columns which in turn enamble analysis of thickness distribution as well as paleotectonic studies (8).
Summary
As it was shown by biostratigraphic studies (3, 11, 12, 13, 16 ... ), the Cretaceous is represented in south-eastern Poland (Fig. 1) by rocks ranging in age from the uppermost Lower Cretaceous (Middle and Upper Albian) to all the stages of the Upper Cretaceous, from Cenomanian to the uppermost Mastrichtian.
The Upper Cretaceous is here represented by monotonous rocks which do not form any distinct lithological complexes and they are difficult to subdivide. In turn, physical properties of these rocks are varying. On the basis of geophysical well logs, the Cretaceous is subdivided into 5 major geophysical complexes and a few correlational horizons are differentiated (Figs. 2, 3). Moreover, there are differentiated two important geophysical marker beds: horizon I B and geophysical complex IV.
The analyses of macro- and microfauna from drillings made it possible to establish general stratigraphic setting of geophysical complexes. Attention is paid to still existing differences in interpretation of some boundaries.
The paper presents brief geophysical and lithological characteristics of the geophysical complexes. The presented model (Figs. 2, 3) makes possible reliable correlation of Cretaceous rocks from borehole columns which in turn enamble analysis of thickness distribution as well as paleotectonic studies (8).