Next Article in Journal
Cyclic Behavior Associated with the Degassing Process at the Shallow Submarine Volcano Tagoro, Canary Islands, Spain
Next Article in Special Issue
Kriging with a Small Number of Data Points Supported by Jack-Knifing, a Case Study in the Sava Depression (Northern Croatia)
Previous Article in Journal
A Multispectral Bayesian Classification Method for Increased Acoustic Discrimination of Seabed Sediments Using Multi-Frequency Multibeam Backscatter Data
Previous Article in Special Issue
Comparison of the Sweetness Seismic Attribute and Porosity–Thickness Maps, Sava Depression, Croatia
Open AccessArticle

Depositional Model, Pebble Provenance and Possible Reservoir Potential of Cretaceous Conglomerates: Example from the Southern Slope of Medvednica Mt. (Northern Croatia)

1
Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
2
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia
3
Croatian Natural History Museum, Demetrova 1, 10000 Zagreb, Croatia
4
Croatian Geological Summer School, Pančićeva 5, 10000 Zagreb, Croatia
5
Croatian Geological Survey, Sachsova 2, 10000 Zagreb, Croatia
6
INA—Industrija Nafte, d.d., Exploration & Production, Exploration & Upstream Portfolio Development, Rock & Fluid Analysis, Lovinčićeva 4, 10000 Zagreb, Croatia
*
Author to whom correspondence should be addressed.
Geosciences 2018, 8(12), 456; https://doi.org/10.3390/geosciences8120456
Received: 15 September 2018 / Revised: 28 November 2018 / Accepted: 1 December 2018 / Published: 4 December 2018
(This article belongs to the Special Issue Geostatistical Applications in Petroleum Geology)
Upper Cretaceous deposits in Medvednica Mt. are composed of coarse-grained conglomerates, sandstones, shales and the pelagic Scaglia Limestones. Such deposits in the wider region possess reservoir potential, not previously studied in Northern Croatia. Modal composition of conglomerates, size and distribution of clasts, porosity and permeability were studied from one new exposure in Medvednica Mt., and the results were compared with previously published data from neighboring successions. Conglomerates are polymictic, clast- to matrix-supported, with clasts and matrix entirely composed of local bedrocks. Porosity varies between 4.98 to 10.89% and permeability from 1.13 to 43.3 mD. Overlying pelagic Scaglia Limestones contain pelagic foraminifera of the latest Santonian to Early Campanian age (83 to 85 Ma). Clasts were eroded from the local hinterland, probably transported to the beach by short-term torrents and deposited along the shelves of the proto-Medvednica Island. Previously presumed alluvial transport is not likely. Deposition took place in a Gosau-type basin during the subsidence phase, additionally controlled by a third-order sea-level change at the Santonian-Campanian boundary. According to this study, Upper Cretaceous clastites possess possible reservoir potential, and deserve more attention in future hydrocarbon research in Croatia. View Full-Text
Keywords: conglomerates; Scaglia limestone; Gosau-type; Late Cretaceous; sedimentology; petroleum geology; statistics; northern Croatia conglomerates; Scaglia limestone; Gosau-type; Late Cretaceous; sedimentology; petroleum geology; statistics; northern Croatia
Show Figures

Figure 1

MDPI and ACS Style

Sremac, J.; Velić, J.; Bošnjak, M.; Velić, I.; Kudrnovski, D.; Troskot-Čorbić, T. Depositional Model, Pebble Provenance and Possible Reservoir Potential of Cretaceous Conglomerates: Example from the Southern Slope of Medvednica Mt. (Northern Croatia). Geosciences 2018, 8, 456.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop