Correlation of continental genesis strata: the case of the Pokur formation of the Beregovoye field

The paper analyzes one of the most important and difficult stages of constructing a geological model of the Beregovoye field when calculating hydrocarbon reserves – the correlation of the productive strata. It considers the productive strata of the Pokur formation of continental origin, analyzes the conditions of sedimentation, recommends the main correlation benchmarks and examines their characteristic features and inherent patterns.

Main principles of the improved technique for the estimation of gas reserves in low-permeability Turonian sediments

The article describes the main principles of estimating volumetric parameters of gas onshore deposits in low-permeability reservoirs of the Turonian stage that were formed as a result of the long-term study of “supra-Cenomanian” sediments at the fields of Rosneft Oil Company PJSC, in particular, at the largest Kharampurskoye oil and gas condensate field. Based on a detailed analysis of the section, the authors formulated recommendations for optimal logging suite, well testing and analysis of the core taken from highly swellable clay rocks of the Kuznetsov formation.

Analysis of existing technologies for processing oil sludge into polymer additives for asphalt concrete

The article deals with the known information about the main type of oil industry waste – oil sludge. Existing methods and technologies of oil sludge processing into polymer additives for asphalt concrete are presented and analyzed. The main problems and shortcomings of the methods of oil sludge processing considered in the study are revealed.

The interdependence of hydrochemical and hydrodynamic processes in evaporite oil and gas basins

The article examines the reasons for the formation of vertical hydrochemical inversion within particular oil and gas basins and points out the role of waters of different genesis in the development of this phenomenon. The following processes of reverse hydrochemical zoning in the sedimentary cover are analyzed: thickening of heavy clay strata and the related squeezing of loosely bound waters, dehydration of clay minerals and catagenic fluid generation accompanying the transformation of organic matter into hydrocarbons of the petroleum series. The hydrochemical inversion at great depths is noted to occur and persist in the environment of the passive hydrodynamic regime; in closed water-drive systems, the demineralization of waters with depth causes the decrease in the hydrodynamic potential gradient, determining the migration pattern not only of water but also of hydrocarbons and, consequently, the location of oil and gas accumulation zones.

Analysis of the financial assurance problem for decommissioning of oil and gas wells and facilities

The harmful effects of oil and gas projects on the environment are not limited to the production period. Unlike operating production facilities, control over the state of abandoned wells and fields falls on the state. In the Russian Federation, the obligations of subsoil user companies to properly perform decommissioning operations are not legally regulated and financially secured. Based on world experience, the paper analyzes the most common schemes for formation and accounting of financial assurance for decommissioning operations and examines the state of legislative regulation on this problem in Russia and the world. It presents recommendations on state regulation to guarantee full completion of decommissioning operations by subsoil users, improve their quality and monitor the environmental safety of abandoned wells.

Characteristics of changes in the moisture content of the tundra cover in the area of the Bovanenkovo field using Landsat satellite data

By the case of the area of a long-term technogenic load of the Bovanenkovo oil and gas condensate field, the possibility of monitoring the moisture content of the tundra cover near technical objects according to the Landsat 5 and Landsat 8 satellites is shown. The work used multispectral images from 1990, 1994, 2013 and 2020. The analysis was carried out on images characterizing the Earth’s surface temperature, surface moisture (NDWI index) and chlorophyll content in the canopy (NDVI index). Characterization and mapping of changes in the moisture content of the cover were carried out according to the difference between the images of 1990 and 2020. Variations in the NDVI index allow us to identify the reasons for these changes. The technogenic impact is shown to lead to an increase in the surface temperature and a decrease in the NDWI and NDVI values, which indicates the predominance of drainage processes and a decrease in the volume of living phytomass near technical objects. Such transformations are less dangerous for objects in comparison with waterlogging of the cover, however, they contribute to an increase in the emission of carbon-containing gases, since an increase in temperature and a decrease in surface moisture, as a rule, lead to degradation of the permafrost and an increase in the depth of the thawed layer.

New geodynamics: geosyncline plate tectonics

For the first time, on the basis of the data set of the Taimyr geophysical site, the processes that cause vertical oscillatory movements of large blocks of the continental crust and largely determine its deep structure are confidently recorded. In this regard, the conceptual apparatus of plate tectonics is being expanded due to terms that were not originally used for it, previously used within the framework of geosyncline theory. Modern geodynamics combines concepts opposed in the past, thereby forming a conceptually new geosyncline plate tectonics. Under the new paradigm, the oil and gas prospects of an area are determined not so much by its confinement to a geostructure of any age, as by the current stage of the geosyncline cycle, characterized by subsidence, active sedimentation processes and formation of a sedimentary basin or, conversely, orogenesis and dominant erosion of sediments. Thus, one or another scenario will cause a different inflow of hydrocarbons from the generation area, which means that regional tectonic movements largely predetermine the realization of the hydrocarbon potential, making them one of the most important criteria for its assessment.

The problem of fluid filtration through cement stone on gas fields with low reservoir permeability

Partial destruction of cement stone or an increase in its permeability during the development of oil and gas fields is a frequent occurrence. There are a huge number of natural and man-made factors that lead to an increase in the gas permeability of the cement ring. This article attempts to investigate the permeability of cement stone in active and abandoned wells. It presents an overview of experimental works devoted to determining the real permeability of cement stone on samples and according to the results of studying the state of wells in various conditions.

Resource potential of gas-saturated part of the Orenburg oil and gas condensate field at the final stages of development

Due to the decline in gas and condensate production at the Orenburg oil and gas condensate field, the priority area of activity of Gazprom PJSC and Gazprom Dobycha Orenburg LLC is the reproduction of the mineral resource base and the achievement of maximum component recovery factors to provide the Orenburg gas and chemical complex. The solution to this problem is directly related to the involvement of the unique reserves of hard-to-recover oil (matrix oil, high-molecular raw materials), confined to the gas-saturated part of the Orenburg field, in the production and deep complex processing. Hard-to-recover oil has a variable composition – from high-bituminous oil in fractured-porous and porous low-permeability reservoirs to liquid traditional oil in porous and large-pore permeable reservoirs. This paper analyzes the results of estimating the reserves of matrix oil, the predicted resources of associated components of matrix oil (metals) and the retained gas reserves, which are not included in the assessment of reserves.

Resource potential of gas-saturated part of the Orenburg oil and gas condensate field at the final stages of development

Due to the decline in gas and condensate production at the Orenburg oil and gas condensate field, the priority area of activity of Gazprom PJSC and Gazprom Dobycha Orenburg LLC is the reproduction of the mineral resource base and the achievement of maximum component recovery factors to provide the Orenburg gas and chemical complex. The solution to this problem is directly related to the involvement of the unique reserves of hard-to-recover oil (matrix oil, high-molecular raw materials), confined to the gas-saturated part of the Orenburg field, in the production and deep complex processing. Hard-to-recover oil has a variable composition – from high-bituminous oil in fractured-porous and porous low-permeability reservoirs to liquid traditional oil in porous and large-pore permeable reservoirs. This paper analyzes the results of estimating the reserves of matrix oil, the predicted resources of associated components of matrix oil (metals) and the retained gas reserves, which are not included in the assessment of reserves.