scholarly journals Results of reinterpretation of marine geochemical survey on the Sakhalin shelf

2021 ◽  
Vol 946 (1) ◽  
pp. 012014
Author(s):  
Yu V Kostrov ◽  
P A Kamenev
Keyword(s):  
Bottom Sediments ◽  
Oil And Gas ◽  
Complex Structure ◽  
Sedimentary Basins ◽  
Research Area ◽  
Seismic Exploration ◽  
Geochemical Data ◽  
Rift System ◽  
Hydrocarbon Gases ◽  
Geochemical Survey

Abstract Geochemical survey of hydrocarbons (HC) all over the world is a reliable tool of the complex of geological exploration, which allows to localize hydrocarbon saturation in structures exposed by seismic exploration, as well as to identify non-structural deposits. In 2011, a marine geochemical survey of the sorbed gases of bottom sediments was carried out on the shelf section of the northwest of Sakhalin Island. Based on the results of geochemical studies, 12 maps of the distribution of hydrocarbon and non-hydrocarbon gases in the work area and 7 maps of the distribution of metals in bottom sediments were constructed. Promising areas were distinguished by anomalies with the maximum content of parameters. The research area is characterized by a complex structure, located within the Baikal synclinal zone of the North Sakhalin oil and gas basin, which is part of the rift system of the Cenozoic sedimentary basins the Sea of Okhotsk. In 2019, the authors began to re-process and reinterpret the data in order to clarify the results. The work was based on modern theoretical foundations and methodological approaches of oil and gas prospecting geochemistry. The interpretation of the results was carried out on the basis of the model of interpretation of geochemical anomalies developed by the authors. Maps of anomalies were constructed according to 11 geochemical criteria and two geological and geochemical sections. The complex interpretation of geological and geochemical data was carried out taking into account the results of seismic exploration and drilling in a single project. According to the results of the complex interpretation, 6 promising sites were identified, which are ranked according to the degree of prospects.

Main directions of searching for hydrocarbons in Nadym-Pursk oil and gas region

2021 ◽  
pp. 23-31
Author(s):  
Y. I. Gladysheva
Keyword(s):  
Oil And Gas ◽  
Raw Materials ◽  
Accumulation Rate ◽  
Sedimentary Basins ◽  
Seismic Exploration ◽  
Research Approach ◽  
Field Development ◽  
The North ◽  
The Sixties ◽  
Hydrocarbon Deposits

Nadym-Pursk oil and gas region has been one of the main areas for the production of hydrocarbon raw materials since the sixties of the last century. A significant part of hydrocarbon deposits is at the final stage of field development. An increase in gas and oil production is possible subject to the discovery of new fields. The search for new hydrocarbon deposits must be carried out taking into account an integrated research approach, primarily the interpretation of seismic exploration, the creation of geological models of sedimentary basins, the study of geodynamic processes and thermobaric parameters. Statistical analysis of geological parameters of oil and gas bearing complexes revealed that the most promising direction of search are active zones — blocks with the maximum sedimentary section and accumulation rate. In these zones abnormal reservoir pressures and high reservoir temperatures are recorded. The Cretaceous oil and gas megacomplex is one of the main prospecting targets. New discovery of hydrocarbon deposits are associated with both additional exploration of old fields and the search for new prospects on the shelf of the north. An important area of geological exploration is the productive layer of the Lower-Berezovskaya subformation, in which gas deposits were discovered in unconventional reservoirs.

scholarly journals GEOLOGICAL STUDIES OF OIL AND GAS FIELDS IN THE EAST ARAL SEDIMENTARY BASIN

2021 ◽  
Author(s):  
С.К. Курбаниязов
Keyword(s):  
Oil And Gas ◽  
Sedimentary Basin ◽  
Raw Materials ◽  
Sediment Accumulation ◽  
Research Area ◽  
Seismic Exploration ◽  
Hydrocarbon Traps ◽  
Oil And Gas Fields ◽  
Detailed Search ◽  
Gas Potential

Объектом исследований являлись верхнепалеозойские, мезозойские и кайнозойские отложения, слагающие разрез в Восточно-Аральском осадочном бассейне, в связи с перспективами выявления месторождений нефти и газа. Обобщены и систематизированы сведения по стратиграфии, литологии, тектонике и нефтегазоносности района исследований. Изучен вещественный состав, палеогеографические, палеотектонические и геодинамические условия накопления осадков данных стратиграфических уровней, установлена их фациальная принадлежность. Составлены литолог-стратиграфические колонки скважин и проведена корреляция стратиграфических подразделений разрезов. Уточнена история геологического развития региона. Выявлены потенциальные коллектора и покрышки. Определены стратиграфические горизонты, благоприятные для формирования залежей углеводородного сырья. Обоснованы наиболее перспективные типы ловушек углеводородного сырья по стратиграфическим уровням и выявлена зональность их распространения. Дана оценка перспектив района на выявление залежей нефти и газа. Выделены информативные и качественные признаки (критерии) нефтегазоносности. Обоснованы площади и конкретные структуры для постановки детальных поисковых работ на выявление залежей нефти и газа. Рассчитана оценкапотенциальных ресурсов углеводородного сырья. Даны рекомендации на проведение первоочередных сейсморазведочных и буровых работ. The object of research was the Upper Paleozoic, Mesozoic and Cenozoic sediments composing the section in the East Aral sedimentary basin, in connection with the prospects for identifying oil and gas deposits. The data on stratigraphy, lithology, tectonics, and oil and gas potential of the research area are summarized and systematized. The material composition, paleogeographic, paleotectonic, and geodynamic conditions of sediment accumulation at these stratigraphic levels were studied, and their facies affiliation was established. The lithological and stratigraphic columns of the wells were compiled and the stratigraphic divisions of the sections were correlated. Updated the history of the geological development of the region. Potential collectors and tires have been identified. The stratigraphic horizons favorable for the formation of hydrocarbon deposits are determined. The most promising types of hydrocarbon traps are justified by stratigraphic levels and the zoning of their distribution is revealed. The assessment of the prospects of the area for the identification of oil and gas deposits is given. Informative and qualitative signs (criteria) of oil and gas potential are identified. The areas and specific structures for setting up detailed search operations to identify oil and gas deposits are justified. The estimation of potential resources of hydrocarbon raw materials is calculated. Recommendations for conducting priority seismic exploration and drilling operations are given.

scholarly journals Integrated approach to the typification and localization of deposits of the anomalous section of the Bazhenov formation of the Frolov oil and gas region

2021 ◽  
Vol 6 (4) ◽  
pp. 12-21
Author(s):  
Olga S. Generalenko ◽  
Anastasia Y. Koltsun ◽  
Svetlana I. Isaeva ◽  
Sergey L. Tarasov ◽  
Vladimir A. Orlov
Keyword(s):  
Oil And Gas ◽  
Integrated Approach ◽  
Wave Pattern ◽  
Research Area ◽  
Seismic Survey ◽  
Seismic Exploration ◽  
Borehole Data ◽  
Bazhenov Formation ◽  
North West ◽  
The Core

Introduction. The subject of the study of this work is the deposits of the anomalous section of the Bazhenov formation (ASB) of Western Siberia, the disturbed occurrence of which was recorded by 2D, 3D seismic exploration and borehole data at many fields of the Frolov oil and gas region. The research area unites the company’s assets in the KhMAO and the Tyumen region, which are part of the large hydrocarbon cluster “ZIMA”. Aim. In order to typify various complexes of rocks of the Bazhenov formation and further localization of deposits, a comprehensive core analysis, GIS and seismic studies were performed. Materials and methods. According to the results of lithological study of the core and petrophysical interpretation of logging diagrams, have been identified various types of rocks in the interval of the Bazhenov formation. According to the results of the interpretation of the seismic survey materials, contoured zones that differ in the wave pattern by different coherence of the axes of common phase. The revealed differences in seismic sections compared with borehole data and geological bodies mapped based on the obtained patterns. Results. Based on a comprehensive interpretation of the core, GIS and seismic studies, established the zonality of the distribution of various types of deposits of the Bazhenov formation, the relationship of the development of ASB zones with the introduction of Early Cretaceous sedimentary bodies and showed the introduction of detrital material from the overlying rocks. Conclusions. The authors of the article conclude that the development of anomalous sections of the Bazhenov formation involves several stages of the introduction of landslide bodies of overlying rocks, according to the gradation of Neocomian clinocyclites in the north-west direction. Within the study area, mapped three large landslide bodies in the Bazhenov formation interval, each of which was formed an internal zonality and because of the introduction of rocks from the overlying interval.

Geological Implications for Gas Saturation of Bottom Sediments in Sedimentary Basins in the Southeastern Sector of the East Siberian Sea

2021 ◽  
Vol 62 (2) ◽  
pp. 157-172
Author(s):  
A.I. Gresov ◽  
A.V. Yatsuk
Keyword(s):  
Bottom Sediments ◽  
Sedimentary Cover ◽  
Sedimentary Basins ◽  
Geologic Structure ◽  
Hydrocarbon Gases ◽  
Acoustic Basement ◽  
Gas Saturation ◽  
Geochemical Parameters ◽  
East Siberian Sea ◽  
Geophysical Surveys

Abstract —We present research results for the geologic structure of the De Long, Aion, and Pegtymel sedimentary basins of the East Siberian Sea. The materials of geological surveys and drilling in their land area and island surroundings, the data obtained from geophysical surveys conducted by Dal’morneftegeofizika, MAGE, and Sevmorgeologiya, and the seismic and deep-drilling data on the U.S. sector of the Chukchi Sea are summarized and analyzed. Pre-Paleozoic strata and the sedimentary cover have been identified throughout the sections of the sedimentary basins, which suggests the existence of a geologic “cover–basement” boundary rather than an arbitrary called “acoustic basement” horizon. The data on the geologic structure and gas saturation of the upper parts of the sedimentary sections were obtained during the study and gas-geochemical testing of core samples and bottom sediments from coastal shallow wells and corers. Gas contained in the rocks and bottom sediments in the study area includes hydrocarbon gases (HCGs) (СН4, С2–С5, and their unsaturated homologues), СО2, Н2, Не, N2, Ar, and, seldom, CO and H2S. The data on gas saturation of bottom sediments and the geochemical parameters of their syngenetic and epigenetic gases are presented. Areas of abnormal saturation of sediments with CO2, СН4, other HCGs, H2, and He (>5, 0.05, 0.001, 0.005, and 0.005 cm3/kg, respectively) have been identified, and maps of the gas saturation patterns in bottom sediments have been compiled. It is established that both gas saturation and distribution are determined mainly by the geologic evolution, tectonics, magmatism, geocryologic conditions, lithologic composition, catagenesis, coal content, bituminosity of sedimentary rocks, and oil and gas potential of the study area.

scholarly journals ORE, OIL-AND-GAS REGIONS OF THE SOUTH OKHOTSK SEA PROVINCE AND DEEP GEODYNAMICS

2020 ◽  
Vol 39 (6) ◽  
pp. 3-24
Author(s):  
V.G. Khomich ◽  
◽  
N.G. Boriskina ◽  
Keyword(s):  
Oil And Gas ◽  
Sea Water ◽  
Mineral Resources ◽  
Fluid Flows ◽  
Sedimentary Basins ◽  
Earth’S Crust ◽  
Okhotsk Sea ◽  
The South ◽  
Hydrocarbon Gases ◽  
Earth's Crust

In the South Okhotsk Sea province – on the islands of Sakhalin, Kunashir, Iturup, Urup and surrounding sea areas – many occurrences of rare, noble metal and other mineralizations as well as of oil-and-gas fields, gas hydrate accumulations, and isolated areas of active emission of water-hydrocarbon gases are known. Occurrences and deposits of solid, liquid and gaseous mineral resources are controlled by hidden deep fault transform zones: Nosappu (Tuscarora), Iturup, and Urup. These long-lived extended (more than 1000 km) zones are distinguished at the N-W Pacific megaplate margin near the S-E flank of the Kuril-Kamchatka trogue. Using the seismotomographic methods we have established their extension to the west from the seismic focal zone in the oceanic slab that subducted into the transition zone of the mantle. In the areas of strike-slip extension the faults accounted for the active formation of the drainage channels for the penetration of the sea water in the lithosphere with the following serpentinization of its ultramafites, and for decompressional generation of ascending mantle-derived abiogenic fluid flows. The latter penetrated from the underslab asthenosphere in the oversubduction mantle wedge and beneath the lithospheric mantle, where they accounted for the development of the processes of metasomatism. The subsequent migration of flows initiated the creation of primary magma reservoirs in the lower parts of the continental lithosphere, and intermediate and peripheral chambers in the Earth’s crust. The injection of melts from the chambers in the consolidated Earth's crust led to the formation of abyssal, hypabyssal intrusive massifs, arch-dome uplifts and magmatogenic-ore (ore-magmatic) systems predominantly among the rocks of the pre-Pliocene basement. The concentration of oil and gas accumulations mainly from the mantle-derived abiogenic hydrocarbons containing mercury, gold, rhenium, and PGE in the Cenozoic sedimentary basins amidst the reservoirs under the impermeable beds also resulted from deep under- and overslab fluid flows.

scholarly journals Oil and gas potential of the Aldan-Maya depression

Georesursy ◽  
2019 ◽  
Vol 21 (1) ◽  
pp. 63-70
Author(s):  
Alexander F. Safronov ◽  
Olga N. Chalaya ◽  
Iraida N. Zueva ◽  
Alexei I. Sivtzev
Keyword(s):  
Oil And Gas ◽  
Seismic Exploration ◽  
Geochemical Data ◽  
Western Border ◽  
Oil Seepage ◽  
The Republic ◽  
The Right ◽  
Gas Potential ◽  
Low Amplitude

The prospects of oil and gas potential of the Aldan-Maya depression, located in the south-eastern part of the Siberian platform, are considered. The lithological-stratigraphic characteristic of the Riphean-Cambrian section has been given, and the compositional features of the organic matter and its bituminous part have been considered. Based on the analysis of geological development history and the seismic exploration results (2014), the platform part territory of the Aldan-Maya depression along the western border expanded to the middle flow of the Amga River. Three main oil and gas potential reservoirs were separated in the cross section of the depression on base geological and geochemical data. The most prospective areas are the middle flow of the Ingili River (the right inflow of the Maya River), where crystal basement is on the surface (Khabarovsk region), and row anticline structures at adjacent platform part near the Aldan-Amga interfluve of the Republic of Sakha (Yakutia). According to the seismic exploration data of “Yakutskgeofizika” OJSC (2014-2016), six local low-amplitude structures of submeridional strike were identified: Belkachy, Bilir, Taryng-Elga, South-Bilir, Mil, Taryng. In our opinion the Belkachy local structure located on the western margin of the Aldan-Maya depression could be the most prospective object. In its western pericline, an oil seepage is detected on the surface. In conclusion we suggest at a long-term perspective to prolong research on oil and gas potential of the upper part of the Malgin suite of the Middle Riphean as a prospective area of shale oil and gas.

Significance of Mineralogical and Lithologic-Petrographical Rank in the Ranking of Geological Information

2020 ◽  
Vol 42 (4) ◽  
pp. 33-49
Author(s):  
O.V. CHEPIZHKO ◽  
V.V. YANKO ◽  
V.M. KADURIN ◽  
I.M. NAUMKO ◽  
S.M. SHATALIN
Keyword(s):  
Fluid Flow ◽  
Black Sea ◽  
Bottom Sediments ◽  
Oil And Gas ◽  
Sedimentary Cover ◽  
Geochemical Characteristics ◽  
The Black Sea ◽  
Flow Parameters ◽  
Geochemical Parameters ◽  
Geological Information

For the first time the importance of mineralogical and lithological-petrographical ranks in the line of geological information ranks is substantiated for implementation of long-term forecasts, standard and non-standard approaches to research of physical and geochemical parameters as a basis of creation of complex system of forecast criteria and prospecting indicators of hydrocarbons within the sedimentary cover of Black sea based on the theory of global fluid-flows derivation. These criteria have different sensitivity to the object (hydrocarbon deposits) and are therefore ranked. The ranking determined the following parameters: 1) seismic data within the object, obtained by the method of deep seismic sounding, RWM SDP; 2) parameters of tectono-geodynamic structures; 3) the main characteristics of sedimentary cover and bedrock; 4) geochemical characteristics; 5) parameters of mineral complexes and fluid inclusions in mineral neoformations; 6) the value of the distribution of meiobenthos. Based on modern views of oil and gas geology, structural-tectonic and lithological-facies criteria are among the main ones. The study of the mineralogical component of sediments is made with using mineralogical, thermobarogeochemical and X-ray spectral methods. Fixation of anomalies of fluid flow at the bottom of the Black Sea as to the distribution of abiotic parameters in order to assess the prospects of oil and gas is determined by structural and tectonic features and high permeability of fluid flow; parameters of mineral complexes (minerals, facies) and genetic connections; heterogeneity of geochemical characteristics of bottom sediments; the presence of hydrocarbon inclusions in authigenic minerals of bottom sediments.

scholarly journals Deep Structure, Tectonics and Petroleum Potential of the Western Sector of the Russian Arctic

2021 ◽  
Vol 9 (3) ◽  
pp. 258
Author(s):  
Alexey S. Egorov ◽  
Oleg M. Prischepa ◽  
Yury V. Nefedov ◽  
Vladimir A. Kontorovich ◽  
Ilya Y. Vinokurov
Keyword(s):  
Oil And Gas ◽  
Deep Structure ◽  
Sedimentary Basins ◽  
The Arctic ◽  
Russian Arctic ◽  
Petroleum Potential ◽  
Western Sector ◽  
Gas Formation ◽  
Evolutionary Genetic ◽  
Tectonic Scheme

The evolutionary-genetic method, whereby modern sedimentary basins are interpreted as end-products of a long geological evolution of a system of conjugate palaeo-basins, enables the assessment of the petroleum potential of the Western sector of the Russian Arctic. Modern basins in this region contain relics of palaeo-basins of a certain tectonotype formed in varying geodynamic regimes. Petroleum potential estimates of the Western Arctic vary broadly—from 34.7 to more than 100 billion tons of oil equivalent with the share of liquid hydrocarbons from 5.3 to 13.4 billion tons of oil equivalent. At each stage of the development of palaeo-basins, favourable geological, geochemical and thermobaric conditions have emerged and determined the processes of oil and gas formation, migration, accumulation, and subsequent redistribution between different complexes. The most recent stage of basin formation is of crucial importance for the modern distribution of hydrocarbon accumulations. The primary evolutionary-genetic sequence associated with the oil and gas formation regime of a certain type is crucial for the assessment of petroleum potential. Tectonic schemes of individual crustal layers of the Western sector of the Russian Arctic have been compiled based on the interpretation of several seismic data sets. These schemes are accompanied by cross-sections of the Earth’s crust alongside reference geophysical profiles (geo-traverses). A tectonic scheme of the consolidated basement shows the location and nature of tectonic boundaries of cratons and platform plates with Grenvillian basement as well as Baikalian, Caledonian, Hercynian, and Early Cimmerian fold areas. Four groups of sedimentary basins are distinguished on the tectonic scheme of the platform cover according to the age of its formation: (1) Riphean-Mesozoic on the Early Precambrian basement; (2) Paleozoic-Cenozoic on the Baikalian and Grenvillian basements; (3) Late Paleozoic-Cenozoic on the Caledonian basement; (4) Mesozoic-Cenozoic, overlying a consolidated basement of different ages. Fragments of reference sections along geo-traverses illustrate features of the deep structure of the main geo-structures of the Arctic shelf and continental regions of polar Russia.

Earth's energy “Golden Zone”: a synthesis from mineralogical research

Clay Minerals ◽  
2011 ◽  
Vol 46 (1) ◽  
pp. 1-24 ◽  
Author(s):  
P. H. Nadeau
Keyword(s):  
Oil And Gas ◽  
Gulf Coast ◽  
Clay Mineralogy ◽  
Sedimentary Basins ◽  
Entrapment Efficiency ◽  
Permeability Evolution ◽  
Reservoir Temperature ◽  
Fundamental Particle ◽  
Geological Processes ◽  
The Impact

AbstractThe impact of diagenetic processes on petroleum entrapment and recovery efficiency has focused the vast majority of the world's conventional oil and gas resources into relatively narrow thermal intervals, which we call Earth's energy “Golden Zone”. Two key mineralogical research breakthroughs, mainly from the North Sea, underpinned this discovery. The first is the fundamental particle theory of clay mineralogy, which showed the importance of dissolution/precipitation mechanisms in the formation of diagenetic illitic clays with increasing depth and temperature. The second is the surface area precipitation-rate-controlled models for the formation of diagenetic cements, primarily quartz, in reservoirs. Understanding the impacts of these geological processes on permeability evolution, porosity loss, overpressure development, and fluid migration in the subsurface, lead to the realization that exploration and production risks are exponential functions of reservoir temperature. Global compilations of oil/gas reserves relative to reservoir temperature, including the US Gulf Coast, have verified the “Golden Zone” concept, as well as stimulated further research to determine in greater detail the geological/mineralogical controls on petroleum migration and entrapment efficiency within the Earth's sedimentary basins.

The impacts of anthropogenic ocean noise on cetaceans and implications for management

2007 ◽  
Vol 85 (11) ◽  
pp. 1091-1116 ◽  
Author(s):  
L.S. Weilgart
Keyword(s):  
Oil And Gas ◽  
Synergistic Effects ◽  
Noise Pollution ◽  
Population Level ◽  
Seismic Exploration ◽  
Foraging Efficiency ◽  
Cetacean Species ◽  
Ocean Noise ◽  
Beaked Whales ◽  
Noise Impacts

Ocean noise pollution is of special concern for cetaceans, as they are highly dependent on sound as their principal sense. Sound travels very efficiently underwater, so the potential area impacted can be thousands of square kilometres or more. The principal anthropogenic noise sources are underwater explosions (nuclear and otherwise), shipping, seismic exploration by mainly the oil and gas industries, and naval sonar operations. Strandings and mortalities of especially beaked whales (family Ziphiidae) have in many cases been conclusively linked to noise events such as naval maneuvers involving tactical sonars or seismic surveys, though other cetacean species may also be involved. The mechanisms behind this mortality are still unknown, but are most likely related to gas and fat emboli at least partially mediated by a behavioral response, such as a change in diving pattern. Estimated received sound levels in these events are typically not high enough to cause hearing damage, implying that the auditory system may not always be the best indicator for noise impacts. Beaked whales are found in small, possibly genetically isolated, local populations that are resident year-round. Thus, even transient and localized acoustic impacts can have prolonged and serious population consequences, as may have occurred following at least one stranding. Populations may also be threatened by noise through reactions such as increased stress levels, abandonment of important habitat, and “masking” or the obscuring of natural sounds. Documented changes in vocal behavior may lead to reductions in foraging efficiency or mating opportunities. Responses are highly variable between species, age classes, behavioral states, etc., making extrapolations problematic. Also, short-term responses may not be good proxies of long-term population-level impacts. There are many examples of apparent tolerance of noise by cetaceans, however. Noise can also affect cetaceans indirectly through their prey. Fish show permanent and temporary hearing loss, reduced catch rates, stress, and behavioral reactions to noise. Management implications of noise impacts include difficulties in establishing “safe” exposure levels, shortcomings of some mitigation tools, the need for precaution in the form of reducing noise levels and distancing noise from biologically important areas, and the role of marine protected areas and monitoring in safeguarding cetaceans especially from cumulative and synergistic effects.

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