Structural–Geodynamic Systems of the Basement of the Black Sea–Caspian Sea Region: Evolution in the Late Paleozoic‒Cenozoic

Geotectonics - Structural-cartographic geological and geophysical materials were analyzed in order to construct a series of models of structural–geodynamic systems of the basement of the...     

Modern Geodynamics and its Influence on the Secondary Filtration Properties of the Reservoirs of the Northeastern Part of the Sakhalin Shelf

The complex tectonic structure of the Okhotsk Sea shelf and the high level of geodynamic activity necessitate the use of geodynamic simulations to forecast the secondary filtration-capacity properties of reservoirs. The 3D geomechanical models were built and the forecasting of the fractured porosity and permeability was conducted for the Kirinskaya, Ayashskaya, and East-Odoptinskaya license areas. The simulation revealed filtration channels, where both vertical and horizontal migration of hydrocarbons occur. It was found that the secondary permeability of the upper and the lower stratigraphic horizons of the studied area significantly differ. The Okobykai clayey member is the boundary surface and serves as the regional cap. All calculations were performed on the 3D-grid geological model, which allows us to use the data for hydrodynamic simulation.     

Fundamental challenges of the location of oil and gas in the South Caspian Basin

Subvertical and subhorizontal bodies were identified in the South Caspian Basin. They are a new class of geological structures with a complicated form, which can serve as migration pathways and hydrocarbon accumulation zones. The basin incorporates a few autonomous sources of oil and gas occurrences with their own distribution areas and spatial–temporal evolution. HC generation sources are displaced relative to each other. The lower boundary of the oil and gas occurrence reaches depths of more than 12–15 km, while the upper boundary of the “oil window” is confined to hypsometric depths of 5–7 km.     

The First Results of Study of Hydrocarbon Biomarkers and Hydrocarbons of a Diamond-like Structure in the Riphean,Vendian, and Lower Cambrian Rocks of the Katanga Saddle

Doklady Earth Sciences - The results of geochemical study of samples from Riphean–Lower Paleozoic rocks enriched in organic matter (the rocks most likely parental for oil) from the southern...     

Modern Geodynamic Processes and Their Impact on Replenishment of Hydrocarbon Resources in the Black Sea–Caspian Region

Geotectonics - Recent studies of the stress state of the Earth’s crust and rates of plate movement of the Caucasian fold system with respect to the Eurasian continent, analysis of sources of...     

Geofluid dynamic concept of hydrocarbon accumulation in natural reservoirs

Most modern theories axiomatically assume that hydrocarbons (HCs), which migrate in different ways from the generation zones and sources with high gradients of reduced pressures, concentrate in autochthonous natural reservoirs possessing smaller levels of reservoir energy. Hydraulic drainage of reservoirs is possible in principle through only three mechanisms: (i) horizontally oriented regional elisional water flow upwards, along the plunge of general folding from central parts of basins towards their peripheral frames; (ii) owing to the effect of lateral pressure of groundwater immediately in traps, with subsequent pushing out by high-pressure fluids supplied to the sunken parts of folds; (iii) vertically directed, from bottom to top, overflow injection mechanism. The study of their possible implementations and relative ratios in the outcome comprise the content of the proposed fluid-dynamic concept of HC accumulation.     

Combined Method of <Emphasis Type="Italic">F</Emphasis>-, <Emphasis Type="Italic">S</Emphasis>-, and <Emphasis Type="Italic">R</Emphasis>-Approximations of Increased Dimensionality in Solving the Problems of Geophysics and Geomorphology

The interrelation between different variants of the method of linear integral representations in the spaces of an arbitrary dimension is considered. The combined approximations of the topography and geopotential fields allows the selection of the optimal parameters of the method in solving a wide range of inverse problems in geophysics and geomorphology, as well as a most thorough use of the a priori information about the elevations and elements of anomalous fields. A method for numerically solving an inverse problem on finding the equivalent, in terms of the external field, mass distributions in the ordinary three-dimensional (3D) space and in the four-dimensional (4D) space is described.     

Geodynamic Conditions of Oil-and-Gas Accumulations in the Ural–Novaya Zemlya Belt

Doklady Earth Sciences - This paper provides a brief tectonic and geological overview of the Ural– Novaya Zemlya Forebelt of Oil-and-Gas Accumulation and describes the conditions under which...