We provide a synthesis of stratigraphic data to unravel the history of the geological evolution of South Crimea in the Mesozoic and Cenozoic. The South Crimea Orogen consists of three major mega-sequences: (1) the Triassic–Early Jurassic; (2) the Aalenian–Bathonian; and (3) the Callovian–Eocene. The Late Triassic–Early Jurassic deposits formed in the environment of a forearc basin and a remnant basin. The Aalenian–Bathonian deposits formed above subduction extension and a volcanic belt. Three main Callovian–Eocene tectonic units can be identified in South Crimea: (1) the South Crimean Shelf Basin; (2) the Sudak Deepwater Trough; and (3) the Alchak–Kaya Shelf Basin at the northern margin of the Shatsky Ridge. The Oligocene–Quaternary deposits are considered to be syn-orogenic. A description of the anticipated stratigraphic units on the Shatsky Ridge is suggested for the Middle Jurassic, Callovian–Late Jurassic, Neocomian, Aptian–Albian, Late Cretaceous–Paleocene, Eocene and Maykopian. We propose a model for the geological history of the Eastern Black Sea Basin. Graben formed during the Late Barremian–Albian at the location of the future Eastern Black Sea Basin and a phase of volcanism occurred in the Albian. The main phase of rifting and spreading of oceanic crust took place during Cenomanian–Santonian time.Supplementary material: A Google Earth kmz file of the location of the outcrops and sections is available at http://www.geolsoc.org.uk/SUP18850
Presently, JSC "NK" Rosneft " holds 13 license areas (License Blocks) in Eastern Siberia. From 2009 till 2012 thirteen exploration and appraisal wells had been drilled on six License Blocks in Irkutsk region, and only one of those wells showed considerable/commercial flow of oil. This is primarily related to low informative content of areal geophysical and geochemical data, due to complex geology, which includes surface traps and tuffs, sills, thick salt intervals and little difference in physical properties of reservoir and non-reservoir rock. Drilling wells within estimated major structural and tectonic traps bounded by faults, identified by 2D seismic and gravmag surveys, did not bring the desired result. Reservoir (subreservoir) drilled happened to have poor permeability and porosity parameters and the wells flowed poorly.
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