scholarly journals Forecasting Gas and Oil Potential of Subsoil Plots via Co-analysis of Satellite, Geological, Geophysical and Geochemical Information by Means of Subjective Logic

2020 ◽  
Vol 8 ◽  
pp. 90-101
Author(s):  
Mykhailo O. Popov ◽  
Мaksym V. Тopolnytskyi ◽  
Olga V. Titarenko ◽  
Sergey Α. Stankevich ◽  
Аrtem A. Аndreiev

The purpose of the paper is to substantiate a new approach to forecasting hydrocarbon potential of subsoil plots via co-analysis of satellite, geo-geophysical and geochemical information by means of subjective logic. Basic concepts of subjective logic are given, the method of forecasting the oil and gas potential of a subsoil plots is described. The method is tested by applying it to real area with hydrocarbon deposits.

1994 ◽  
Vol 34 (1) ◽  
pp. 674 ◽  
Author(s):  
Kevin Lanigan ◽  
Shane Hibbird ◽  
Sandy Menpes ◽  
John Torkington

Exploration over Roper Group outcrop in the McArthur Basin prompted Pacific Oil & Gas to investigate the petroleum potential of the Beetaloo Sub-basin, a 15 000 km2 Proterozoic depression concealed beneath Phanerozoic cover. Since 1989 drilling and seismic has identified a broadly flat-lying sequence with uplifted, eroded margins. A 3 500 m composite Proterozoic section consisting of three sandstone-to-mudstone sequences has been drilled. The lower two sequences comprise conformable units of the Mesoproterozoic upper Roper Group and unconformably overlying them is a previously unknown sequence comprising the informally labelled 'Jamison Sandstone' and 'Hayfield Mudstone', probably of Neoproterozoic age.Organic-rich intervals in the Roper Group mudstones range one to three per cent TOC in the Kyalla Member, and two to seven per cent TOC in the 'Middle' Velkerri Formation. Across most of the sub-basin the oil window lies within the Kyalla Member around 900–1350 m, while the 'Middle' Velkerri Formation is around 2 500 m and well into overmaturity, but may still have potential for gas. Potential reservoirs in the Bessie Creek, Moroak and 'Jamison' Sandstones, and in sandy units within the mudstones, are compromised by diagenesis, but porosities of up to 20 per cent and permeabilities of tens and rarely hundreds of millidarcies have been measured. Encouraging shows were observed in many of these intervals, and small quantities of oil and gas have been recovered in drill stem tests. With only a few targets drilled to date, this frontier area requires more exploration before its hydrocarbon potential can be adequately assessed.


Author(s):  
H.O. Zhuchenko ◽  
I.R. Mykhailiv ◽  
N.V. Hoptariova ◽  
H.D. Horvanko

The topicality of the research is determined by the detailed study of the peculiarities of the geological structure of Boryslav-Pokuttia zone of the Precarpathian deflection, in particular of local structural forms as probable traps for oil and gas, for reliable prediction of the oil and gas potential of the subsoil. Boryslav-Pokuttia zone of the Precarpathian deflection refers to one of the oldest oil and gas producing regions in Ukraine. Its hydrocarbon potential is far from being exhausted. The complex block structure of Boryslav-Pokuttia zone requires the development of specific methods for conducting oil and gas prospecting. In this regard, determining the distribution nature of the local structures and specifying the peculiarities of their morphological forms in the area under investigation are of great importance. The issue of tracing tectonic disturbances and determining their screening ability which determines the possible existence of hydrocarbon deposits remains to be an urgent matter. Solving these issues will significantly improve the geological efficiency of prospecting and exploration in the areas of Boryslav-Pokuttia zone. At the modern stage of the Earth sciences development computer processing of geological data is widely used.Therefore, along with the traditional approach to describing structures as potential traps for oil and gas, it isnecessary to analyze their quantitative (numerical) parameters. It gives a possibility to confirm the stablished regularities more reasonably. Handling large array of quantitative indicators of local structures and the dependencies established among them makes it possible to simulate the processes that formed them and to determine the regularities of their distribution. The most important scientific and practical results include: the quantitative indicators ranking of the local structures of Boryslav-Pokuttia zone (the ranking contains four groups of structures classified according to their morphological texture); the investigated conditions for the formation of morphological varieties of local structures and the character of the distribution of tectonic deformations in them. The results of geological and mathematical simulation according to a complex of quantitative indicators help to state that local structures with certain morphological features, which are revealed to various extent in their deformations, are formed by tectonic movements of different magnitude and direction and are described by the numerical parameters peculiar only to them. Investigating the distribution of tectonic stresses and deformations, which can be estimated in quantitative indicators, will contribute to a more reliable prediction of the oil and gas potential of the subsoil. In its turn, it will improve significantly the geological performance of oil and gas prospecting in the areas of BoryslavPokuttia zone of the Precarpathian deflection.


2017 ◽  
pp. 25-34
Author(s):  
G. .. Mukher ◽  
S. F. Kulagina ◽  
A. V. Goryachev ◽  
E. A. Pakhomova ◽  
A. A. Gladyshev

The features of the geological structure and oil and gas potential of the Bazhenov-Abalak oil and gas complex are discussed. Based on new geological and seismic data, using an integrated approach, the zones of distribution and the boundaries of thinning out of silty sand reservoir rocks of Vogulkinskaya strata were mapped, four traps and two zones (Ourinskaya, Eastern Tolumskaya), which are perspective for hydrocarbon deposits search, were distinguished. In Bazhenov horizon, the zones of development of anomalous sections and bituminous sediments were mapped, laying above Bazhenov formation, which are perspective for hydrocarbon deposits search. Recommendations for further exploration are given.


Author(s):  
H. I. Rudko ◽  
V. V. Sobol

Energy independence is an important component of sustainable development and security of the state. Ukraine has a great hydrocarbon potential of the subsoil, which is why the priority objective is a search and exploration of new deposits of hydrocarbon raw materials. One of the important directions for increase of potential resources and reserves of oil and gas is the development of large deep (over 4500–5000 m) deposits, as hydrocarbon reserves at small and medium depths are quite depleted in many regions. For a long time, hydrocarbon reservoirs in basement rocks were underestimated during geological exploration works. Obtained results indicate that new concepts of the formation of hydrocarbon deposits can dramatically change the system of oil production, methods of prospecting and development of deposits. It is important to assess possible oil-and-gas-bearing capacity of sediments and rocks of the basement by identifying prospective areas of hydrocarbon deposits, including in the rocks of the crystalline basement. In Ukraine, main prospects of discovery of oil and gas deposits at great depths are associated nowadays with the Dnieper-Donets Rift (DDR). Deposits with accumulations of hydrocarbons at depths of more than 5000 m are concentrated in the main oil-and-gas-bearing areas of the Rift that coincide with the central paraxial and marginal zones of the graben. It was in the central segment of the DDR that the main regularities of oil-and-gas-bearing capacity of deep-lying geological formations were first discovered: secondary nature of reservoirs, discovery of the phenomenon of supercollectors and associated huge debits. It is relevant and promising to study the process of recovery/replenishment of gas reserves by the example of deposits that are at the final stage of development.


2012 ◽  
Vol 34 (5) ◽  
pp. 132-137
Author(s):  
B. M. Polukhtovich ◽  
V. V. Gladun ◽  
T. E. Dovzhok ◽  
P. Ya. Maksymchuk ◽  
S. M. Zakharchuk ◽  
...  

2021 ◽  
Vol 11 (4) ◽  
pp. 4699-4708
Author(s):  
Odiljon G. Khayitov ◽  
Gulnarakhon K. Salizhanova ◽  
Marhamat A. Mutalova ◽  
Sevara I. Aminzhanova ◽  
Malika Y. Mishareva

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.


Author(s):  
Е.А. Данилова

В 2021 году А.А. Драгуновым при помощи системно-геодинамического дешифрирования были выявлены Восточно-Оренбургский и Западно-Оренбургский геодинамически активные очаги генерации углеводородов Оренбургского нефтегазоконденсатного месторождения. Было предположено, что ряд малых залежей юго-запада Оренбургской области также получают от них подпитку. Целью представленной работы являлась попытка проследить вышеуказанные очаги генерации углеводородов в фундаменте и осадочном чехле на основе переинтерпретации временных разрезов региональных сейсмических профилей. Методы работы. Выделение тектонических нарушений проводилось вручную с применением авторских методических приемов приближений и последовательной детализации. После чего выполнялось системное обобщение и анализ полученных результатов в свете перспектив нефтегазоносности юго-запада Оренбургской области. Результаты работы. В результате работ было рассмотрено глубинное строение очагов, отмечены сейсмогеологические особенности их обнаружения. В местах картирования очагов генерации на временных разрезах зафиксированы неотектонические разломы «цветкового» типа, хаотическая вертикально направленная локально усиленная сейсмическая запись под ними ниже отражающего горизонта, отождествляемого с породами фундамента. Прослежена связь глубинных разломов и связанных с ними новейших оперяющих разломов с солянокупольными структурами кунгурского возраста. По результатам комплексного геологического анализа структурных построений выявлена схематическая сеть неотектонических разломов фундамента, судя по которой, Оренбургское нефтегазоконденсатное месторождение и другие, более мелкие месторождения углеводородов и выявленные сейсморазведочными работами структуры юго-запада Оренбургской области имеют закономерное распределение внутри крупной радиально-концентрической структуры диаметром около 180 км. Данная структура, вероятно, представляет собой зону разуплотнения в фундаменте, в пределах которой в осадочном чехле образовались перспективные в плане нефтегазоносности структуры. Уникальное и самое крупное в пределах юго-запада Оренбургской области Оренбургское месторождение находится в центре макроструктуры, являясь, возможно, результатом работы главных очагов генерации УВ в фундаменте. Вдоль радиальных и концентрических разломов сосредоточены более мелкие месторождения углеводородов. Кроме того, Оренбургское месторождение приурочено к зоне наложения двух концентров, что, возможно, является значительным фактором при обнаружении крупных месторождений. В качестве выводов даны рекомендации для дальнейших исследований и поиска возможных геодинамически активных очагов генерации углеводородов в пределах Русской платформы In 2021, A.A. Dragunov, using system-geodynamic decoding, identified the East-Orenburg and West-Orenburg geodynamically active centers of hydrocarbon generation of the Orenburg oil and gas condensate field. It was assumed that a number of small deposits in the south-west of the Orenburg region also receive recharge from them. The aim of the presented work was an attempt to trace the above-mentioned sources of hydrocarbon generation in the foundation and sedimentary cover on the basis of reinterpretation of time sections of regional seismic profiles. Methods. The selection of tectonic disturbances was carried out manually using the author's methodological techniques of approximations and sequential detailing. After that, a systematic generalization and analysis of the results obtained was carried out in the light of the prospects for oil and gas potential of the south-west of the Orenburg region. Results. As a result of the work, the deep structure of the foci was considered, the seismogeological features of their detection were noted. Neotectonic faults of the "flower" type, chaotic vertically directed locally enhanced seismic recording under them below the reflecting horizon identified with the basement rocks were recorded in the places of mapping the generation centers on time sections. The connection of deep faults and the newest feathering faults associated with them with salt-dome structures of the Kungur age is traced. According to the results of a comprehensive geological analysis of structural structures, a schematic network of neotectonic basement faults has been identified, judging by which the Orenburg oil and gas condensate field and other smaller hydrocarbon deposits and the structures identified by seismic surveys in the southwest of the Orenburg region have a regular distribution within a large radial-concentric structure with a diameter of about 180 km. This structure probably represents a zone of decompression in the foundation, within which promising structures in terms of oil and gas potential were formed in the sedimentary cover. The Orenburg deposit, which is unique and the largest within the south-west of the Orenburg Region, is located in the center of the macrostructure, possibly being the result of the work of the main centers of HC generation in the foundation. Smaller hydrocarbon deposits are concentrated along the radial and concentric faults. In addition, the Orenburg field is confined to the zone of overlap of two concenters, which is probably a significant factor in the discovery of large deposits. As conclusions, recommendations are given for further research and search for possible geodynamically active centers of hydrocarbon generation within the Russian platform.


Georesursy ◽  
2021 ◽  
Vol 23 (4) ◽  
pp. 73-79
Author(s):  
Olga Loktionova ◽  
Lyudmila Kalinina ◽  
Igor Mikhaylov

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.


2021 ◽  
Vol 3-4 (185-186) ◽  
pp. 16-32
Author(s):  
Halyna Medvid ◽  
Olga Teleguz ◽  
Vasyl Harasymchuk ◽  
Maria Kost’ ◽  
Solomiya Kalmuk

The hydrogeochemical parameters of the Lower Sarmatian aquifer of the north-western part of the Outer Zone of the Carpathian Foredeep have been studied. The waters of the chloride-calcium type (according to the classification of V. O. Sulin) are dominated. Other types of water are distributed locally. On the basis of the calculated genetic coefficients, the conclusion on sedimentogenic conditions of their forming during a geological history of the region is made. It is established that the general tendency for the deposits of the Outer Zone is increasing of TDS of water with depth and stratigraphy. The waters of the north-western part of the Outer Zone are characterized by reduced values of sulfate content and sulfation coefficient rSO42– • 100/rCl–, indicating the conditions of hydrogeological closed structures. The genetic index of formation water metamorphism (rNa+/rCl–) is mainly inversely dependent on TDS. Its values greater than one are inherent in waters of hydrocarbonate-sodium and sulfate-sodium types, which are not typical for the hydrocarbon deposits. The nature of fluctuations in the values of the chlorine-bromine coefficient is fully consistent with other hydrochemical parameters and the results of paleohydrodynamic reconstructions. A detailed analysis of the current hydrodynamic situation of Lower Sarmatian aquifer in combination with geochemical features and paleohydrodynamic reconstructions allowed to identify the perspective structures of the studying region. Our forecasts for the gas potential of the Krukenychy depression are consistent with the forecasts of researchers of Ivano-Frankivsk National Technical University of Oil and Gas. The results of their research are based on gravitational field anomalies.


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