scholarly journals Kerogen amount calculation required for the formation of hydrocarbon deposits in the Western oil and gas region of Ukraine

2020 ◽  
Vol 1 (182) ◽  
pp. 52-61
Author(s):  
Yurii KHOKHA ◽  
Oleksandr LYUBCHAK ◽  
Myroslava YAKOVENKO ◽  
Dmytro BRYK
Keyword(s):  
Oil And Gas ◽  
Source Material ◽  
Gas Condensate ◽  
Type Ii ◽  
Generative Capacity ◽  
Gas Generation ◽  
Entropy Maximization ◽  
Kerogen Pyrolysis ◽  
Gas Fields ◽  
Hydrocarbon Deposits

This paper considers the issue of determining the maximum hydrocarbons amount that can be generated by kerogen using thermodynamic methods. It is shown that the chemical composition of natural gas or gas condensate contains information about the generative capacity of kerogen from which it was formed. Based on experiments of type II and I kerogen pyrolysis and thermodynamic calculations by entropy maximization method, we propose a new method for determining the amount of kerogen from which gas was formed, which contains 1 dm3 of methane at a given ratio of butane isomers. The obtained data are interpreted as an indicator of kerogen maturity in the context of the depth of its destruction. This method is applied to theWestern oil and gas region of Ukraine hydrocarbon deposits. The analysis of kerogen transformations in the region sedimentary strata, using criteria of the GASTAR diagram, is carried out. We assessed the trends of kerogen conversion in the region in the areas of “maturity” and “biodegradation” in the ratio of ethane/propane (C2/C3) to ethane/isobutane (C2/i-C4). It is shown that the majority of deposits in the Western oil and gas region developed in the direction of maturation and only a small group of gas deposits – biodegradation. To establish the gases genesis in the region, we built a graph of the two geochemical indicators dependence – the methane/ethane ratio (C1/C2) and ethane/propane ratio (C2/C3). It is shown that some of the gas fields is formed due to the conversion of organic material of oil deposits. At the same time, gas condensate fields in the region, with few exceptions, are formed due to the primary destruction of kerogen. Based on the results of the calculations, maps of the methane (generated by type II kerogen) amount distribution were constructed. It is established that kerogen, which was the source material for hydrocarbon deposits of Boryslav-Pokuts oil and gas region, has practically exhausted its gas generation potential. Instead, kerogen from gas and gas condensate fields in the Bilche-Volytska oil and gas district still retains the potential to generate hydrocarbons.

scholarly journals Oil and Gas Potential in the Territory of the South-Eastern Part of the Bukhara-Khiva Region

2021 ◽  
Vol 11 (4) ◽  
pp. 4699-4708
Author(s):  
Odiljon G. Khayitov ◽  
Gulnarakhon K. Salizhanova ◽  
Marhamat A. Mutalova ◽  
Sevara I. Aminzhanova ◽  
Malika Y. Mishareva
Keyword(s):  
Oil And Gas ◽  
High Capacity ◽  
Gas Condensate ◽  
Gas Content ◽  
Southeastern Part ◽  
Promising Target ◽  
Gas Fields ◽  
Gas Potential ◽  
Filtration Properties ◽  
Hydrocarbon Deposits

The article analyzes the oil and gas content of the southeastern part of the Bukhara-Khiva region. It is shown that this territory is the main promising target for prospecting for new oil, gas and hydrocarbon deposits. It was revealed that the main productive deposits are carbonate deposits. It has been established that the most widespread and large ones are massive deposits in traps of the structural-lithological type, confined to the Callovian-Oxfordian reef deposits and distinguished by high capacity and filtration properties. It is argued that the lower part of the reservoirs is flooded in all fields of this type. The characteristic is given of 44 open oil, oil and gas condensate, gas condensate and gas fields of the specified region. Pre-Jurassic deposits contain hydrocarbons. The features of the structural plans of carbonate and salt-anhydrite formations and their influence on the location of oil and gas deposits within the southeastern part of the Bukhara-Khiva region for increasing hydrocarbon reserves have been determined. The fields under development in the stage of deep drilling have been clarified. Recommendations for deepening geological exploration are offered.

The geosolitonic concept of high output hydrocarbon deposits formation

2021 ◽  
pp. 13-22
Author(s):  
R. M. Bembel ◽  
S. R. Bembel ◽  
M. I. Zaboeva ◽  
E. E. Levitina
Keyword(s):  
Western Siberia ◽  
Oil And Gas ◽  
Chemical Elements ◽  
Seismic Exploration ◽  
Oil And Gas Fields ◽  
Recoverable Reserves ◽  
Production Wells ◽  
Cumulative Production ◽  
Gas Fields ◽  
Hydrocarbon Deposits

Based on the well-known results of studies of the ether-geosoliton concept of the growing Earth, the article presents the conclusions that made it possible to propose a model of thermonuclear synthesis of chemical elements that form renewable reserves of developed oil and gas fields. It was revealed that local zones of abnormally high production rates of production wells and, accordingly, large cumulative production at developed fields in Western Siberia are due to the restoration of recoverable reserves due to geosoliton degassing. Therefore, when interpreting the results of geological and geophysical studies, it is necessary to pay attention to the identified geosoliton degassing channels, since in the works of R. M. Bembel and others found that they contributed to the formation of a number of hydrocarbon deposits in Western Siberia. When interpreting the results of geological-geophysical and physicochemical studies of the fields being developed, it is recommended to study the data of the ring high-resolution seismic exploration technology in order to identify unique areas of renewable reserves, which can significantly increase the component yield of hydrocarbon deposits.

scholarly journals Improve The Efficiency Of The Study Of Complex Reservoirs And Hydrocarbon Deposits - East Baghdad Field

2020 ◽  
Author(s):  
Sudad H Al-Obaidi
Keyword(s):  
Oil And Gas ◽  
Water Saturation ◽  
Well Logging ◽  
Well Testing ◽  
Petrophysical Parameters ◽  
Oil And Gas Fields ◽  
Hydrocarbon Fields ◽  
Gas Fields ◽  
Hydrocarbon Deposits

Practical value of this work consists in increasing the efficiency of exploration for oil and gas fields in Eastern Baghdad by optimizing and reducing the complex of well logging, coring, sampling and well testing of the formation beds and computerizing the data of interpretation to ensure the required accuracy and reliability of the determination of petrophysical parameters that will clarify and increase proven reserves of hydrocarbon fields in Eastern Baghdad. In order to calculate the most accurate water saturation values for each interval of Zubair formation, a specific modified form of Archie equation corresponding to this formation was developed.

scholarly journals An unconventional Neoproterozoic – Early Cambrian source rock interval in southern Oman: Implications for oil and gas generation

GeoArabia ◽  
2009 ◽  
Vol 14 (4) ◽  
pp. 53-86
Author(s):  
Isabelle Kowalewski ◽  
Bernard Carpentier ◽  
Alain-Yves Huc ◽  
Pierre Adam ◽  
Sylvie Hanin ◽  
...  
Keyword(s):  
Organic Matter ◽  
Kinetic Parameters ◽  
Source Rock ◽  
Oil And Gas ◽  
Bulk Composition ◽  
Early Cambrian ◽  
Type Ii ◽  
Gas Generation ◽  
Standard Type ◽  
Geochemical Parameters

ABSTRACT The Neoproterozoic – Early Cambrian Ara intra-salt petroleum system in Oman has been the subject of several studies since the early 1990s, not least because of the exploration success that has accompanied the emergence of the play. As one of the oldest known commercial hydrocarbon systems, the properties of the source organic matter have been of particular interest. The Ara intra-salt hydrocarbon system consists of the Al Shomou Silicilyte, a rock which is composed of pure microcristalline silica, and carbonate colloquially known as “stringers”. Both occur as slabs encased in the Ara salt. In the case of the Silicilyte, the slabs can be shown to act both as source rock and reservoir. However, in the case of the carbonate stringers, the association is more ambiguous. A set of rock and oil samples have been selected from different wells penetrating the silicilyte and carbonate stringer plays to better characterize and understand these systems. As far as the sedimentary organic matter is concerned, the Al Shomou Silicilyte domain has an average Total Organic Carbon (TOC) of approximately 4 wt.%. The carbonate-prone domains exhibit rare organic-rich lithofacies (TOC of approximately 2 wt.%) and additional intra-salt shales (TOC of approximately 4 wt.%). The organic matter present in both the Silicilyte and carbonate plays is associated with a hypersaline and anoxic depositional environment, rich in sulfur, and showing very similar chemical signatures (bulk composition, elemental analysis, biomarker content, δ13C). The organic matter associated with these sequences is characterized by an unusual “asphaltenic” nature. Compared to classical fossil organic matter taken at an equivalent maturity level, the organic matter found in the intra-salt silicilyte, shales or carbonates releases a large amount of solvent soluble material, which is very rich in Nitrogen-Sulfur-Oxygen (NSO) compounds, implying a standard Type II-S kerogen. However, the organic matter differs from this classic characterization of kerogen (solvent insoluble) in that a large proportion appears to be a sulfur-rich “soluble” kerogen, which has not been previously described. Independent geochemical parameters (Rock-Eval analysis, kinetic parameters) seem to be consistent with this hypothesis. The thermal maturity of the whole set of samples examined places them in the oil window. Moreover, Thermochemical Sulfate Reduction (TSR) did not occur in these samples. As far as the soluble part is concerned, differences in the molecular (significant molecular variations for norhopanes, secobenzohopanes, carotane, X compounds, thianes, thiolanes) and sulfur isotopic composition were demonstrated, and are assumed to reflect subtle variations in depositional settings between Silicilyte and carbonate stringers. The specific properties of this unconventional organic matter has to be accounted for in the thermal modeling of oil and gas generation. Although the kinetic distribution for kerogen cracking is close to that of a Type II-S kerogen, it is slightly more mono-energetic. A compositional 2-D basin modeling (Temis 2D) was performed on a cross-section through the South Oman Salt Basin, using specific kinetic parameters measured on this unconventional Neoproterozoic – Early Cambrian kerogen (based on a linear grouping of insoluble kerogen and NSO like “soluble kerogen” kinetic parameters). The gas-to-oil ratio GOR prediction was improved within the silicilyte, when compared to the use of classical parameters assigned to Type II-S kerogen. Finally, the microcrystalline silica mineral matrix of the silicilyte plays is proposed to play a major role in the composition of the fluid, which is expelled and produced by imposing a strong geochromatographic effect on fluids and the retention of polar compounds. The preferential release of aliphatics would lead to the production of oils exhibiting a strong condensate character. This effect has to be considered when modeling the actual composition of the movable fluid in the silicilyte. The significance of the geochromatographic effect is yet to be quantified, but according to available observations, we suggest that this geochromatographic effect could explain the observed API gravity difference between oils produced from silicilyte and carbonate plays.

scholarly journals THE ROLE OF MOLECULAR PHYSICS IN THE FORMATION AND PLACEMENT OF HYDROCARBON DEPOSITS IN OROGENIC FORMATIONS

2018 ◽  
pp. 23-29
Author(s):  
Yu. Ya. Bolshakov ◽  
E. Yu. Neyolova
Keyword(s):  
Porous Media ◽  
Oil And Gas ◽  
Capillary Forces ◽  
Gas Content ◽  
Hydrocarbon Accumulation ◽  
Molecular Physics ◽  
Water Saturated ◽  
Gas Fields ◽  
Hydrocarbon Deposits

The article considers the large gas fields geology aspects of which are totally in conflict with the principles of anticline theory of hydrocarbon accumulation. These fields are situated in orogenic formations and associated with large synclinal structures. Any seals and lateral screens are absent. Gas saturated reservoirs are surrounded by relatively large-porous water-saturated sandstones and retained in pools due to the capillary forces. The nature of these fields is determined by the molecular physics laws, which effect in oil-wet porous media. These areas are abundant within the geosynclinal systems where synclinal structures can be considered as perspective for oil-and-gas content.

scholarly journals Complex geodynamic indicators for forecasting hydrocarbon deposits in the arctic zone

2021 ◽  
Vol 1201 (1) ◽  
pp. 012080
Author(s):  
V A Minaev ◽  
R O Stepanov ◽  
A O Faddeev
Keyword(s):  
Oil And Gas ◽  
Vortex Structures ◽  
The Arctic ◽  
Shelf Zone ◽  
Arctic Zone ◽  
Horizontal Shear ◽  
Shear Deformations ◽  
Oil And Gas Fields ◽  
Gas Fields ◽  
Hydrocarbon Deposits

Abstract In the article, in relation to the Arctic zone of the Russian Federation, a new method of forecasting hydrocarbon deposits based on computer geodynamic modelling procedures is considered. It is less expensive compared to field and analytical methods. The approbation of the method on the example of the Laptev Sea shelf zone showed a good interpretability of its results and their compliance with the forecast obtained by other methods. The rationality of using six geodynamic indicators for forecasting: the distributions of vortex structures of the velocity vectors of horizontal shear deformations and vortex structures of normal linear deformations; the values of the velocity vectors of horizontal shear deformations and velocity vectors of horizontal normal linear deformations; the distributions of the anomalous gravitational field in isostatic reduction and the reduced temperature. The sequence of stages in determining the potential of hydrocarbon deposits in the studied territories is described, which is associated with the solution of six interrelated sequential tasks: the choice of local territorial areas of optimal size - the calculation of geodynamic indicators – the allocation of homogeneous territorial clusters – the detailing and improvement of geodynamic indicators – the determination of the potential of oil and gas fields in the cluster – the localization of oil and gas fields in each cluster – construction of a digital forecast map of the location of oil and gas fields in the study area.

scholarly journals Interpretation of electrical logging data from the Hettangian-Aalenian terrigenous reservoirs in the Southeast of Western Siberia

Georesursy ◽  
2021 ◽  
Vol 23 (4) ◽  
pp. 73-79
Author(s):  
Olga Loktionova ◽  
Lyudmila Kalinina ◽  
Igor Mikhaylov
Keyword(s):  
Western Siberia ◽  
Oil And Gas ◽  
Data Interpretation ◽  
Upper Jurassic ◽  
Lower Jurassic ◽  
Oil And Gas Fields ◽  
Water Saturated ◽  
Gas Fields ◽  
Gas Potential ◽  
Hydrocarbon Deposits

In the southeast of Western Siberia, the most studied are the Upper Jurassic deposits, most of the oil and gas fields being confined to them. However, the probability of discovering new hydrocarbon deposits in the Upper Jurassic horizons is extremely small. Therefore, of great importance is finding new hydrocarbon deposits in less studied deep-lying complexes. The article considers the development of a criterion for determining the saturation type of the terrigenous reservoirs in the Hettangian-Aalenian deposits in the southeast of the West Siberian sedimentary basin. We use the example of the Ust-Tym megadepression, a large depression located in the central part of the Tomsk region. The Lower and Middle Jurassic sections are represented by the Urman and Togur formations, Salat formation (Peshkov formation is its isochronous analogue) and Tyumen formation, and characterized by the alternation of predominantly sandy (potential reservoirs) and argillaceous-carbonaceous (seals) sequences. In the studied interval, tests were carried out in just a few wells, for which reason the identification of deposits and promising objects is complicated. Determining the type of reservoir saturation will significantly improve the assessment of oil and gas potential. As a result of interpreting lateral logging sounding data, the geoelectric parameters of the invasion zone and undisturbed formation were reconstructed for the Lower Jurassic and Aalenian deposits. Based on the well logging data interpretation by means of numerical inversion, we obtained the criterion for the saturation type of the reservoirs (Ju11-17) in the Hettangian-Aalenian complex. The boundary resistivity values for the oil-saturated reservoirs vary from 8 to 20 ohm∙m, while for the water-saturated ones they do not exceed 5 ohm∙m.

Integrated substantiation of the Erema–Chona giant gas–condensate–oil field (Lena–Tunguska petroleum province)

2020 ◽  
Author(s):  
Georgy G. Shemin ◽  
Keyword(s):  
Oil And Gas ◽  
Oil Field ◽  
Gas Condensate ◽  
Structural Elements ◽  
Compelling Evidence ◽  
Oil And Gas Fields ◽  
Gas Fields ◽  
Favorable Conditions

This paper provides compelling evidence for the previously discovered oil and gas fields in the central, most uplifted part of the Nepa–Botuoba anteclise, to be the constituent structural elements of the Erema–Chona giant gas–condensate–oil field. The revealed tectonic, lithological–facies, and geochemical affinities within its limits attest to equally favorable conditions for the formation of oil and gas accumulations.

scholarly journals PALEO- AND EXISTENT HYDROGEOLOGICAL CONDITIONS OF THE BILCHE-VOLYTSA ZONE OF THE CARPATHIAN OIL- AND GAS-BEARING PROVINCE

2019 ◽  
Vol 2 (179) ◽  
pp. 68-83
Author(s):  
Vasyl HARASYMCHUK ◽  
Halyna MEDVID ◽  
Maria KOST ◽  
Olha TELEGUZ
Keyword(s):  
Oil And Gas ◽  
Oil Fields ◽  
Time Interval ◽  
Mechanism Of Formation ◽  
East European ◽  
Hydrogeological Conditions ◽  
Clay Rocks ◽  
Gas Fields ◽  
Hydrocarbon Deposits ◽  
Gas Bearing

On the basis of paleo- and modern hydrogeological sings it was possible to establish a space-time mechanism of formation and reservation of gas and oil deposits in the Bilche-Volytsa zone of the Carpathian oil- and gas-bearing province. The time interval of their forming applies on the last cycle of the hydrogeological time. Geodynamic and secondary geostatic loadings, that manifested themselves during the dynamo-elision stage (Late Badenian – up to the present) the development of which was caused by thrust motions of the covers, turned out to be the factors of migration of aqueo-hydrocarbon mixtures deep underthrust structures of the Inner zone. Time calculations for reservation of deposits of gas fields have determined their age which does not exceed 6 million years. The south-western trend of motion of paleo- and modern infiltration waters in combination with reversed dynamo-elision have caused here the existence hydrodynamically balanced system squeezed between them which differs by favourable conditions for the formation and reservation of hydrocarbon deposits. We have ascertained the connection between piezomaxima and areas of tectonic dislocation, mainly transverse, that points out the ways of transsference of hydrocvarbon mixtures from deep-seated horisons. Discharge areas (perspective on a plane of searching for new deposits) are limited by local piezomaxima on the background of regional fields. Areas of paleopiezominima in the near-fault part of the Ugerske-Kosiv blocks at the boundary with the East European Platform are favourable for localization of hydrocarbon deposits. Results of the baroosmotic analysis of hydrogeological conditions of gas and oil fields have revealed baroosmotic flows of waters molecules in the thickness of clay rocks, their intensity and directions of motion and connections with deposits.

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