scholarly journals Seismotectonics of the High Mountain Part of the Eastern Caucasus and the Prospects of Gas Content on the Example of the Natural Manifestation of Gas in Tsuschar Village (Dagestan)

2020 ◽  
pp. 150-163
Author(s):  
С.А. Мамаев ◽  
А.Р. Юсупов ◽  
А.С. Мамаев ◽  
З.А. Юсупов
Keyword(s):  
Oil And Gas ◽  
Geological Structure ◽  
Aerial Photographs ◽  
Gas Content ◽  
Tectonic Activity ◽  
High Mountain ◽  
Rare Gases ◽  
Research Results ◽  
Main Research ◽  
Mountain Part

В данной статье даны особенности геологического строения района газопроявления «Цущар» в Кулинском районе на отложениях среднеюрского возраста, предлагается геолого-структурная схема возможного формирования залежи нефти и газа. Незначительные проявления газоносности, связанные обычно с минеральными источниками и подчиненные мощной толще юрских сланцев, развитых на значительных площадях нагорного Дагестана, начали обращать на себя внимание с 1931 г., в связи с поисками месторождений легких редких газов. Анализы газов показывают повышенное содержание легких редких газов в целом ряде месторождений нагорного Дагестана. Кроме группы месторождений Южного Дагестана известен пока только один выход горючего газа в Центральном Дагестане – Кулинском районе. На него указывает в своем рукописном отчете Дагестанскому Совнархозу геолог Н. М. Леднев. Этот выход подчинен юрским сланцам, связан с нарушениями неотектонического характера, образованными в результате сейсмической активизации региона. Цель исследования. Целью наших исследований является обоснование перспектив газоносности Горного Дагестана. На изучаемой территории отмечается наличие неправильных куполовидных складок с неожиданными направлениями их осей, пересекающими основное направление складчатости, частичными местными уклонениями в залегании пластов. Методы исследования. Основными методами исследования при изучении перспектив газоносности Горного Дагестана являлись геолого-структурный, стратиграфический, морфологический, тектонический и дешифрирование аэрофотоснимков. Результаты исследования. По сравнению с Предгорным Дагестаном и Прикумским районом, Горный Дагестан был подвержен более интенсивным геотектоническим движениям, неоднократно подвергался складчатости, испытал инверсию, со значительно большей амплитудой, что привело к усиленной денудации, развитию трещиноватости и разрывов, метаморфизму пород и органических образований. Все это отрицательно влияло на сохранение нефти и газа. Можно предполагать, что многие залежи, сформировавшиеся при прохождении продуцирующими толщами главной фазы нефтеобразования, были разрушены в периоды активизации тектонической деятельности на рубеже юры и мела, мела и палеогена. В дальнейшем шла генерация, преимущественно, газообразных углеводородов, которые при особенно благоприятных условиях могли сохраниться до настоящего времени. По результатам исследований можно утверждать, что газовое проявление Цущар могло проявиться в 1622, 1652 гг. в результате сильных землетрясений, эпицентр которых располагался в пределахисследуемого района This article describes the features of the geological structure of the Tsushar gas show area in the Kulinsky region on the Middle Jurassic deposits, and proposes a geological-structural diagram of the possible formation of oil and gas deposits. Minor manifestations of gas content, usually associated with mineral springs and subordinate to a thick stratum of Jurassic shales, developed over large areas of highland Dagestan, began to attract attention from 1931, in connection with the search for deposits of light rare gases. Gas analyzes show an increased content of light rare gases in a number of fields in highland Dagestan. In addition to the group of fields in Southern Dagestan, only one outlet of combustible gas in Central Dagestan is known – the Kulinsky region. It is pointed out in his handwritten report to the Dagestan Economic Council by the geologist N. M. Lednev. This outlet is subordinate to the Jurassic shale and is associated with neotectonic disturbances formed as a result of seismic activation of the region. Aim. The purpose of our research is to substantiate the prospects for gas content in Gorny Dagestan. In the study area, there are irregular dome-shaped folds with unexpected directions of their axes crossing the main direction of folding, partial local deviations in bedding. Methods. The main research methods in the study of the prospects for the gas content of Mountainous Dagestan were geological-structural, stratigraphic, morphological, tectonic and additional aerial photographs. Research results. Compared to Piedmont Dagestan and Prikumskiy region, Gorny Dagestan was subject to more intense geotectonic movements, repeatedly underwent folding, experienced inversion, with a much higher amplitude, which led to increased denudation, the development of fracturing and fractures, metamorphism of rocks and organic formations. All of this negatively affected the conservation of oil and gas. It can be assumed that many deposits, formed during the passage of the producing strata of the main phase of oil formation, were destroyed during periods of intensified tectonic activity at the boundary between the Jurassic and Cretaceous, Cretaceous and Paleogene. In the future, there was the generation of mainly gaseous hydrocarbons, which, under especially favorable conditions, could persist to the present day. According to the research results, it can be argued that the gas manifestation of Tsushar could have manifested itself in 1622, 1652. as a result of strong earthquakes, the epicenter, which was located within the study area

scholarly journals Role of multiple reflections in the formationof wave field in the cretaceous successions of the Middli Kura depression in Azerbaijan

2021 ◽  
Vol 43 (3) ◽  
pp. 123-134
Author(s):  
T. R. Akhmedov ◽  
T. Kh. Niyazov
Keyword(s):  
Wave Field ◽  
Upper Cretaceous ◽  
Oil And Gas ◽  
Geophysical Methods ◽  
Geological Structure ◽  
Gas Content ◽  
Seismic Exploration ◽  
Time Interval ◽  
Multiple Reflections ◽  
Seismic Sections

The article is devoted to the elucidation of the nature of the wave field recorded below the supporting-dominant seismic horizon «P» in the Middle Kura depression of Azerbaijan. A brief overview of the work carried out here is given; it is indicated that some geologists and geophysicists of our country, in our opinion, mistakenly assume that the observed wave field below the specified horizon is formed mainly by multiple reflections. Since the introduction of the common depth point method into the practice of seismic exploration, individual areas of the Middle Kura depression in Azerbaijan, including the Yevlakh-Agjabedi trough, have been repeatedly studied with varying degrees of frequency tracking. On the basis of this, a fairly large number of promising structures have been identified and mapped. But the structure of the Mesozoic, in particular the deposits of the Upper Cretaceous, still remains insufficiently studied. The study of the geological structure of the Mesozoic sediments, which are considered promising in terms of oil and gas content, is an urgent geological task; exploration work was carried out in the studied areas of the Middle Kura depression using a complex of geophysical methods at the modern technical and methodological level and new results were obtained. The constructed seismic sections show a dynamically pronounced and well-traceable seismic horizon corresponding to the Mesozoic surface and located deeper than it, relatively weak, short, discontinuous reflective boundaries that characterize the structure within the Mesozoic deposits. The studies carried out on the basis of modeling and velocity analysis made it possible to prove that the wave field in the time interval corresponding to the Mesozoic deposits owes its origin to intermittent single reflections from volcanic-carbonate deposits of the Upper Cretaceous age.

scholarly journals SEISMIC AND EOLOGICAL CRITERIA OF PETROLEUM POTENCIAL OF PRE-JURASSIC DEPOSITS OF THE OSTANIN AND THE NORTH-OSTANIN FIELDS (TOMSK REGION)

2019 ◽  
Vol 2 (1) ◽  
pp. 217-224
Author(s):  
Kseniya Kanakova ◽  
Mikhail Kanakov
Keyword(s):  
Western Siberia ◽  
Oil And Gas ◽  
Geological Structure ◽  
Gas Content ◽  
The North ◽  
Close Proximity ◽  
Tomsk Region

Despite the recent increased interest of researchers in the pre-Jurassic deposits of Western Siberia, this complex of rocks still remains relatively unexplored. In this paper, we consider fields that are in close proximity to each other, but have. fundamentally different geological structure and criteria for the oil and gas content of rocks that form the top of the pre-Jurassic complex.

Features of the geological structure of an oil and gas condensate field in Tomsk region

2021 ◽  
pp. 48-60
Author(s):  
S. F. Mulyavin ◽  
A. V. Byakov ◽  
R. A. Neschadimov
Keyword(s):  
Oil And Gas ◽  
Phase State ◽  
Volatile Oil ◽  
Geological Structure ◽  
Gas Condensate ◽  
Gas Content ◽  
Oil Viscosity ◽  
Coastal Marine ◽  
Tomsk Region ◽  
Continental Origin

The X oil and gas condensate field is located in Parabel district of Tomsk region; the field is large in terms of recoverable reserves. Oil and gas content is confined to Jurassic sediments of Tyumen suite and Vasyugan suite. The reservoirs of the Vasyugan suite are marine and coastal-marine sediments, characterized by alternating sandstones, mudstones, siltstones, clays and exhibit complex internal aging. The productive deposits of the Tyumen suite are of continental origin and are distinguished by significant lithological variability. One oil deposit (J11 stratum), one gas and oil deposit (J12 stratum) and three gas condensate deposits (J13-4, J3, J4-5 strata) were identified in the productive formations. The article analyzes the features of the geological structure and conditions of sedimentation of productive strata. In terms of its phase state and physicochemical proper-ties, the fluid of the J11 deposit is a "volatile oil", phase state of which is close to the near-critical. Reservoirs of productive formations are of terrigenous type, porous, low-permeability, while the oil productivity of the formations is high due to the ultra-low oil viscosity.

scholarly journals Geological structure and petroleum potential of the Kara Sea shelf

2019 ◽  
Vol 489 (3) ◽  
pp. 272-276
Author(s):  
V. A. Kontorovich ◽  
A. E. Kontorovich
Keyword(s):  
Oil And Gas ◽  
Sedimentary Basins ◽  
Geological Structure ◽  
Water Area ◽  
Kara Sea ◽  
Gas Content ◽  
Liquid Hydrocarbons ◽  
The South ◽  
Petroleum Potential ◽  
The North

On the Kara Sea shelf, there are two sedimentary basins separated by the North-Siberian sill. Tectonically the southern part of the Kara Sea covers the South Kara regional depression, which is the northern end of the West Siberian geosyncline. This part of the water area is identified as part of the South Kara oil and gas region, within which the Aptian-Albian-Senomanian sedimentary complex is of greatest interest in terms of gas content, in terms of liquid hydrocarbons - Neocomian and Jurassic deposits. The northern part of the Kara Sea is an independent North Kara province, for the most part of which the prospects of petroleum potential are associated with Paleozoic sedimentary complexes. Oil and gas perspective objects of this basin may be associated with anticlinal, non-structural traps and reef structures.

scholarly journals New data on eruptions of mud volcanoes in Azerbaijan

2021 ◽  
Author(s):  
Ад.А. Алиев ◽  
Г.Д. Етирмишли
Keyword(s):  
Oil And Gas ◽  
Historical Review ◽  
Geological Structure ◽  
Gas Content ◽  
Mud Volcano ◽  
Mud Volcanoes ◽  
Eruptive Center ◽  
The North ◽  
East Azerbaijan ◽  
Almost All

Статья посвящена новым извержениям самых активных грязевых вулканов Шамахи-Гобустанского региона Восточного Азербайджана – Шихзарли и Гушчу, характеризующихся частыми проявлениями. Так, начиная с 1844 г. зарегистрировано 26 извержений грязевого вулкана Шихзарли, одно из которых, наиболее интенсивное произошло в феврале 1902 г. после катастрофического Шамахинского землетрясения. Цель исследования. Рассмотрены геологическая позиция грязевых вулканов, сейсмологические данные, определившие глубину очага и энергию извержения, дан краткий исторический обзор извержений. Методы исследования. Геологическое строение площадей расположения грязевых вулканов изложено на основе новых данных, полученных в последние годы о тектонике грязевулканических районов Азербайджана, в частности Гобустана, с выделением разломных структур и расположенных между ними микроблоков, а также тектонических единиц – аллохтон, паравтохтон и автохтон. В одном их таких микроблоков (Баянатинский) расположен грязевой вулкан Шихзарли, относящийся к паравтохтону. Почти все извержения грязевых вулканов Шихзарли и Гушчу, а также последние их проявления спровоцированы землетрясениями, происшедшими в близкорасположенных к ним районах и отмечены 5–7 сейсмостанциями. Предыдущее извержение грязевого вулкана Гушчу в Шамахинском районе в январе 2020 года явилось следствием подземных толчков в соседнем Исмаиллинском районе. В историческом обзоре рассматриваемых грязевых вулканов отмечены характерные и отличительные особенности их проявлений. Последнее (16-е) извержение грязевого вулкана Гушчу произошло из нового эруптивного центра, на расстоянии 700 м к северу от основного действующего более ста лет кратера вулкана. Результаты работы. Приведены результаты геохимического анализа вулканической брекчии, особенно нефтеносных пород – песчаников и горючих сланцев эоцен-миоценовых отложений для оценки перспектив нефтегазоносности площадей расположения изученных грязевых вулканов. В пределах Баянатинского микроблока нефтегазовые скопления могут быть открыты под грязевулканическим очагом The article is devoted to new eruptions of the most active mud volcanoes Shikhzarli and Gushchu in the Shamakhi-Gobustan region of East Azerbaijan. These volcanoes are characterized by frequent manifestations. Thus, since 1844, 26 eruptions of the Shikhzarli mud volcano have been recorded. The most intense eruption occurred in February 1902 after the catastrophic Shamakhi earthquake. Aim. The geological position of mud volcanoes, seismological data that determined the depth of the source and the energy of the eruption are considered. A brief historical review of the eruptions is given. Methods.The geological structure of the areas where mud volcanoes are located is presented on the basis of new data obtained in recent years on the tectonics of mud volcanic regions of Azerbaijan. In particular for this reason was used Gobustan, with the identification of fault structures and microblocks located between them, as well as tectonic units - allochthon, parautochthon and autochthon. In one of these microblocks (Bayanata), there is the Shikhzarli mud volcano, which belongs to the parautochthon. Almost all the eruptions of the Shikhzarli and Gushchu mud volcanoes, as well as their last manifestations, are induced by earthquakes that have occurred in the regions close to them and are registered by 5–7 seismic stations. The previous eruption of the Gushchu mud volcano in the Shamakhi region in January 2020 was the result of tremors in the neighboring Ismayilli region. In the historical review of the considered mud volcanoes, characteristic and distinctive features of their manifestations are noted. The last (16th) eruption of the Gushchu mud volcano occurred from a new eruptive center, at a distance of 700 m to the north of the main crater of the volcano that has been active for more than a hundred years. Results. The results of geochemical analysis of volcanic breccias, especially oil-bearing rocks - sandstones and oil shales of Eocene-Miocene deposits are presented to assess the prospects for oil and gas content of the areas where the considered mud volcanoes are located. Within the Bayanata microblock, oil and gas accumulations can be discovered under a mud volcanic chamber

Features of generation, migration and accumulation of hydrocarbons in the eastern part of the Skythian plate

2021 ◽  
pp. 4-16
Author(s):  
V.Yu. Kerimov ◽  
◽  
N.Sh. Yandarbiev ◽  
R.N. Mustaev ◽  
S.A. Alieva ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Sedimentary Cover ◽  
Basin Analysis ◽  
Source Rocks ◽  
Gas Content ◽  
Tectonic Structures ◽  
Research Results ◽  
Scythian Plate ◽  
Spatio Temporal

The article shows the main spatio-temporal regularities of the development of the processes of generation, migration and accumulation of hydrocarbon fluids in the eastern part of the Scythian plate. The authors studied the features of the generationaccumulation hydrocarbon systems of the northern platform side - the Karpinsko-Mangyshlak and East Ciscaucasian oil and gas regions based on the application of technologies of basin analysis and modeling of hydrocarbon systems. The research results indicate that the following hydrocarbon systems are distinguished in the sedimentary cover of the eastern part of the Scythian plate: Jurassic, Cretaceous, Paleocene-Eocene, and Oligocene-Miocene systems. Based on the results of the studies and modeling, the main directions of further prospecting and exploration work in the eastern part of the Scythian plate were determined. The study area was differentiated by the nature of the predicted oil and gas content, the age of the promising complexes and the confinement to tectonic structures and zones. Keywords: generation; migration; accumulation; hydrocarbons; Scythian plate; hydrocarbon systems; basin analysis; modeling; source rocks.

QUANTITATIVE ANALYSIS OF THE RELATIONSHIP BETWEEN THE SIZE AND LOCATION OF OIL AND GAS FIELDS WITH GRAVITATIONAL ANOMALIES OF THE FERGANA DEPRESSION

2020 ◽  
Vol 2020 (3) ◽  
pp. 95-112
Author(s):  
R Umurzakov ◽  
◽  
S Rabbimkulov
Keyword(s):  
Oil And Gas ◽  
Gravity Anomalies ◽  
Geological Structure ◽  
Gas Content ◽  
Effective Volume ◽  
Oil And Gas Fields ◽  
Local Gravity ◽  
Gas Fields ◽  
The Impact ◽  
Gravitational Anomalies

Based on the analysis of published materials, it is noted that the degree of connection between the indicators of the anomalies of the gravitational field and oil and gas content remains unclear. The aim of the research was to study the nature of the dependence and assess the degree of connection between the size and location of oil and gas fields with gravitational anomalies using the example of the Fergana oil and gas region. To solve this problem, the published material on the geological structure and data on the sizes (effective volume) of deposits, as well as data on deep anomalies of the gravity field in the Fai reduction, were used. The study involved about 70 deposits. Analysis of variance showed that the “influence” of the deep anomaly factor on the effective volume of the fields in the Fergana depression is significant and reliable with a probability of 0.99. At the same time, the share of the influence of this factor on the effective volume of oil deposits in relation to the total impact of all factors is 42%, and for oil and gas - 62%. This testifies to the significant influence of deep subcrustal processes that create corresponding gravitational effects on the formation of the size and location of oil and gas fields in the Fergana depression. According to local gravity anomalies, the impact on the location and effective volumes of deposits is significant, but the reliability is low. The degree of influence on them remains unclear. The results obtained can be used to develop methods for forecasting promising areas for performing high-priority geological exploration works.

GEOLOGICAL STRUCTURE AND OIL AND GAS CONTENT OF THE OKSKY SUPER-HORIZON OF THE BUZULUK DEPRESSION UPLIFT ODNORODNOYE IN ORENBURG REGION

2015 ◽  
pp. 13-16
Author(s):  
R. A. Katkov ◽  
V. I. Kislukhin
Keyword(s):  
Oil And Gas ◽  
Geological Structure ◽  
Gas Content ◽  
Orenburg Region ◽  
Commercial Value

The article describes the study of the geological structure and oil and gas content of the Oksky super-horizon of the Buzuluk depression uplift Odnorodnoye in Orenburg region. It considers a commercial value of the productive formation in regard to the super-horizon Oksky, within which the oil and gas deposits were identified.

Geodynamic and Lithofacies Features of Deposit Formation of the AV11-2 Horizon of the Samotlor Field

2018 ◽  
Vol 785 ◽  
pp. 88-93
Author(s):  
Vadim Aleksandrov ◽  
Marsel Kadyrov ◽  
Andrey Ponomarev ◽  
Denis Drugov ◽  
Vladimir Zapevalov
Keyword(s):  
Oil And Gas ◽  
Structural Models ◽  
Geological Structure ◽  
Gas Content ◽  
High Gravity ◽  
Geological Modeling ◽  
Individual Unit ◽  
Geophysical Information ◽  
Flow Diagrams ◽  
Special Studies

An era of a high-gravity oil of the Samotlor field formations AV2-5 and BV8-10 is near to its end. The production deposits of the AV11-2 horizon are the main reserve of oil production and the basic prospect in this area. Stratigraphically, the AV11-2 horizon belongs to the Alym suite of the early Aptian Age that was distinguished as an individual unit at the 1967 interdepartmental stratigraphic meeting with the stratotype in the Uvat test well. This part of the section started to form around 400,000 years ago and is represented by siltites with interlays of clays and sandstones, primarily bioturbated ones, which causes the specific lens-clustered laminarity of these rocks (Ryabchik) with rare double leafs and single pancake-shaped primitive foraminifers such as saccamina. Specific features of the geological structure and oil-and-gas content of the AV11-2 horizon within the area under consideration were in various aspects described earlier in the works of many researchers [1-8]. Nevertheless, when new geological and geophysical information had been accumulated, the need arose to cover this issue once again. Since it makes us consider the geological modeling of formations in the horizon from quite a different angle, we need to create various structural models of HC reservoirs, development flow diagrams, etc. The research objective is to define the genesis of producing deposits of the AV11-2 horizon and identify fascia complexes in them. Using a system of special studies and methods for analyzing geological development and structure (paleotectonic, grain size, fascia, electrometric, etc.), the areas of sedimentation and fascia systems were diagnosed within the area under research.

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