A5065338741- Paleontology and Stratigraphy of Fossils
- Marine and environmental studies
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Geological formations and processes
- Geological Formations and Processes Exploration
- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- Geological Studies and Exploration
- Ancient and Medieval Archaeology Studies
- Rock Mechanics and Modeling
- Mining and Industrial Processes
- Coal and Its By-products
- Tree-ring climate responses
- Geotechnical and Mining Engineering
- Geomechanics and Mining Engineering
- Integrated Water Resources Management
- Smart Grid Security and Resilience
- Grouting, Rheology, and Soil Mechanics
- Hydraulic Fracturing and Reservoir Analysis
- Geochemistry and Elemental Analysis
- Drilling and Well Engineering
- ICT Impact and Policies
- Geological Modeling and Analysis
- Structural Engineering and Materials Analysis
Bulgarian Academy of Sciences
2024
University of Mining and Geology "Saint Ivan Rilski"
1993-2020
Abstract Sedimentary facies and cycles of the Triassic continental–marine transition NW Bulgaria are documented in detail from reference sections along Iskar river gorge between villages Tserovo Opletnya. The depositional environments evolved anastomosing meandering systems Petrohan Terrigenous Group to mixed fluvial tidal settings Svidol Formation, peritidal shallow-marine conditions Opletnya Member Mogila Formation. For first time, palynostratigraphic data presented here allow for dating...
Abstract A cyclostratigraphic interpretation of peritidal to shallow-marine ramp deposits the early Middle Triassic (Anisian) Opletnya Member exposed in outcrops along Iskar River gorge, NW Bulgaria, is presented. Based on facies trends and bounding surfaces, depositional sequences several orders can be identified. New biostratigraphic data provide a time frame studied succession with placement boundaries Anisian substages show that Aegean (early Anisian) substage lasted about 1.6 Myr. In...
The Malogne Phosphatic chalk quarry was developed by the rooms and pillars mining method within an area of 67 ha. site is partially flooded located in close proximity to important infrastructure as railway, highway, residential houses. During after its exploitation several significant ground collapses were registered. last one, with 1.2 ha 3 m amplitude occurred 2015 nearby railway line. To assess behavior underground openings a combination situ structural measurements laboratory mechanical...
A sequence- and cyclostratigraphic interpretation of early Anisian (Aegean) shallow-marine carbonate ramp deposits, exposed in outcrop sections west Tserovo village, NW Bulgaria, is presented. The hierarchical pattern identified can be interpreted terms Milankovitch cyclicity with elementary sequences representing the precession (20-kyr) cycle, small-scale short eccentricity (100-kyr), medium-scale long (400-kyr) cycle. Palynology provides a robust stratigraphic framework. study sedimentary...
A huge number of factors controls rock mass failure, but it is mainly influenced by the state stress and in particular on bearing capacity failure mechanism massif. The evaluation strength confined unconfined compression, as well its tension strength, are key issues to understand behaviour prior failure. connection between laboratory analyses practical use obtained data presented current work. properties, confinement effect mechanisms successfully studied volcanic specimens from an...
Water content may have a crucial effect on the petrophysical and mechanical properties of high porosity rocks such as chalk. Consequently, water fluctuations significantly influence behaviour engineering structures that are constructed in chalks. It is aim this study to illustrate how elastic strength chalk can evolve considering variation using P-wave velocity analytical analyses. To ultrasonic compressional wave (VP), measurements travel time three samples subjected different were...
The paper reports the first results of organic geochemical characterization mudstones from Shavar Fm (eastern Rhodope Mt., Bulgaria). rock matrix is unevenly impregnated by amorphous matter at onset oil generation (Tmax ~ 445ºC; PI – 0.1–0.2). High total carbon contents (avg. TOC 5.9 wt. %) and HI (~720 mg HC/g TOC) argue for oil-prone source-rocks with very good hydrocarbon potential. n-alkane distributions maxima in range n-C20-25 are consistent origin submerged plants. Additionally,...