Geophysical investigation of deep crustal structure of the Siberian Platform region

1989 ◽  
Vol 20 (2) ◽  
pp. 39 ◽  
Author(s):  
V.S. Surkov ◽  
V.I. Lotyshev
Keyword(s):  
Crustal Structure ◽  
Siberian Platform ◽  
Oil And Gas ◽  
Deep Structure ◽  
Practical Importance ◽  
Geophysical Methods ◽  
Crustal Thickness ◽  
Crystalline Basement ◽  
The West ◽  
Deep Crustal Structure

A sparse network of regional profiles developed in Siberia using deep seismic sounding methods (DSS) does not allow a valid three dimensional model of Siberian deep crustal structure to be constructed. To create such a model, interpretation methods of available geophysical and geological data are suggested. These are based on modelling of geological objects using potential fields. Information on DSS key profiles is considered to be key data.The results of such interpretation are shown in the crustal thickness map and in that of crystalline basement, as well as on a deep geological-geophysical profile across the West Siberian Plate and Siberian Platform. The crustal thickness in Siberia varies from 30 to 55 km. It is on average 4?6 km thicker on the Siberian Platform than the West Siberian Plate. The least crustal thickness of 30 to 33 km appears to be beneath regions with maximum thickness of Mesozoic deposits. Modern and Early Mesozoic rift zones are characterized by decreased crustal thickness of 36?39 km. Ancient shields of the Siberian Platform and adjacent folded mountain units are up to 45?55 km thick.The geometry of the top of crystalline basement in the young West Siberian Plate is sharply different from that of the ancient Siberian Platform. Within the West Siberian Plate structural features with 5 to 11 km of relief dominate, while on the Siberian Platform the structural relief varies from 2?3 to 14 km.The peculiarities of deep crustal structure have greatly influenced the formation and distribution of sedimentary units. The constructed section shows the depths and thicknesses of the Riphean, Vendian?Silurian, Devonian?Middle Triassic and Mesozoic?Cenozoic megacomplexes, most promising for oil and gas in Siberia. Data obtained on the deep structure of Siberian Platform regions are thus of great practical importance. They can be used to predict areas of petroleum potential and determine optimal trends of further oil and gas exploration by geophysical methods.

Deep crustal structure across a young passive margin from wide-angle and reflection seismic data (The SARDINIA Experiment) – II. Sardinia’s margin

2015 ◽  
Vol 186 (4-5) ◽  
pp. 331-351 ◽  
Author(s):  
Alexandra Afilhado ◽  
Maryline Moulin ◽  
Daniel Aslanian ◽  
Philippe Schnürle ◽  
Frauke Klingelhoefer ◽  
...  
Keyword(s):  
Crustal Structure ◽  
Passive Margin ◽  
Data Sets ◽  
Wide Angle ◽  
Seismic Velocities ◽  
The West ◽  
Reflection Seismic ◽  
Gulf Of Lion ◽  
Deep Crustal Structure ◽  
Domain Iii

Abstract Geophysical data acquired on the conjugate margins system of the Gulf of Lion and West Sardinia (GLWS) is unique in its ability to address fundamental questions about rifting (i.e. crustal thinning, the nature of the continent-ocean transition zone, the style of rifting and subsequent evolution, and the connection between deep and surface processes). While the Gulf of Lion (GoL) was the site of several deep seismic experiments, which occurred before the SARDINIA Experiment (ESP and ECORS Experiments in 1981 and 1988 respectively), the crustal structure of the West Sardinia margin remains unknown. This paper describes the first modeling of wide-angle and near-vertical reflection multi-channel seismic (MCS) profiles crossing the West Sardinia margin, in the Mediterranean Sea. The profiles were acquired, together with the exact conjugate of the profiles crossing the GoL, during the SARDINIA experiment in December 2006 with the French R/V L’Atalante. Forward wide-angle modeling of both data sets (wide-angle and multi-channel seismic) confirms that the margin is characterized by three distinct domains following the onshore unthinned, 26 km-thick continental crust : Domain V, where the crust thins from ~26 to 6 km in a width of about 75 km; Domain IV where the basement is characterized by high velocity gradients and lower crustal seismic velocities from 6.8 to 7.25 km/s, which are atypical for either crustal or upper mantle material, and Domain III composed of “atypical” oceanic crust. The structure observed on the West Sardinian margin presents a distribution of seismic velocities that is symmetrical with those observed on the Gulf of Lion’s side, except for the dimension of each domain and with respect to the initiation of seafloor spreading. This result does not support the hypothesis of simple shear mechanism operating along a lithospheric detachment during the formation of the Liguro-Provencal basin.

Composition and age of the crystalline basement in the northwestern part of the west Siberian oil-and-gas megabasin

2014 ◽  
Vol 459 (2) ◽  
pp. 1582-1586 ◽  
Author(s):  
K. S. Ivanov ◽  
V. A. Koroteev ◽  
Yu. V. Erokhin ◽  
S. P. Shokalsky ◽  
S. A. Sergeev
Keyword(s):  
Oil And Gas ◽  
Crystalline Basement ◽  
Northwestern Part ◽  
The West

scholarly journals BIOGEOCHEMICAL INDICATORS, ANOMALIES AND THEIR OIL-GEOLOGICAL SIGNIFICANCE (TUNGUSKA BASIN)

2021 ◽  
Author(s):  
I.S. Kopylov ◽  
Keyword(s):  
Siberian Platform ◽  
Oil And Gas ◽  
The West ◽  
Geological Significance ◽  
Oil And Gas Exploration ◽  
Tunguska Basin ◽  
Biogeochemical Indicators ◽  
Benzene Toluene ◽  
Propane Butane

Hydro-biogeochemical studies were carried out in the west of the Siberian platform in the basin of the river Podkamennaya Tunguska, where 1204 groundwater sources and watercourses were studied in terms of biogeochemical indicators. The most informative indicators have been established - bacteria that oxidize propane, butane, pentane, benzene, toluene. According to these parameters and total biogenicity, 42 anomalies with areas of 10-200 km2 were identified. In structural and tectonic terms, 20 biogeochemical anomalies are confined to local positive structures, which can be considered promising for oil and gas exploration.

scholarly journals Replenishment of oil deposits from the position of a new concept of oil and gas formation

Georesursy ◽  
2019 ◽  
Vol 21 (4) ◽  
pp. 40-48 ◽  
Author(s):  
Renat Kh. Muslimov ◽  
Irina N. Plotnikova
Keyword(s):  
Oil And Gas ◽  
Deep Structure ◽  
Sedimentary Cover ◽  
Crystalline Basement ◽  
The South ◽  
Gas Saturation ◽  
Oil Reserves ◽  
Long Term Study ◽  
The Earth ◽  
Deep Wells

The article is devoted to the problem of replenishing of oil reserves and considers it (the problem) in the aspect of deep degassing of the Earth. Based on an analysis of the results of a long-term study of the Precambrian crystalline basement in the territory of Tatarstan and adjacent areas, a number of new criteria are formulated that allow us to identify the processes of deep degassing of the Earth within the studied region. The article provides a brief overview of current views on the problem of replenishing oil reserves, considers options for possible sources and the mechanism of replenishment of hydrocarbons in the developed deposits. The arguments in favor of the modern process of deep degassing within the South Tatar arch and adjacent territories are examined, which are unequivocally confirmed by: the dynamics of the hydrochemical parameters of the deep waters of the crystalline basement obtained in the monitoring mode at five deep wells; uneven heat flux and its anomalies, recorded according to many years of research under the guidance of N.N. Khristoforova. The degassing processes are also confirmed by the dynamics of gas saturation of decompressed zones of the crystalline basement recorded in well 20009-Novoelkhovskaya, the dynamics of gas saturation of oil of the sedimentary cover and the composition of the gas dissolved in it, identified by oil studies in piezometric wells located in different areas of the Romashkinskoye field; the seismicity of the territory of Tatarstan, as well as its neotectonic activity. As criteria proving the existence of a process of replenishing the reserves of the developed oil fields of the South Tatar Arch, the features of the deep structure of the earth’s crust according to seismic data, as well as the results of geochemical studies of oils are considered.

scholarly journals The oil and gas potential of the north of the Siberian platform and adjacent shelf

2021 ◽  
Vol 1201 (1) ◽  
pp. 012076
Author(s):  
A N Dmitrievskiy ◽  
N A Eremin ◽  
N A Shabalin ◽  
I K Basnieva ◽  
A T Kondratyuk
Keyword(s):  
Siberian Platform ◽  
Seismic Data ◽  
Oil And Gas ◽  
Deep Structure ◽  
The Arctic ◽  
The North ◽  
Common Depth Point ◽  
Oil And Gas Resources ◽  
The Common ◽  
Gas Potential

Abstract The objective of this article is an estimation of the oil and gas potential of the north of the Siberian platform and adjacent shelf. The Siberian platform is characterized by a large concentration of oil and gas resources in the southern and central parts of the platform. The main oil and gas province of the Siberian Platform is the Leno-Tungus oil and gas province. The oil- bearing strata in the Lena-Tungus oil and gas province are confined to the Riphean, Vendian, Lower-Middle Cambrian deposits, in which large oil and gas fields are discovered. In modern contours the Siberian platform in the north and north-west is fringed by the Yenisei-Khatanga regional trough. In the east, the Yenisei-Khatanga regional trough is connected with the Anabar- Lena trough, framing the north-eastern part of the Siberian platform. Analysis of the available geological and geophysical materials shows a fairly high potential of the Anabar-Lena and Yenisei-Khatanga troughs for the discovery of large hydrocarbon fields. The basic understanding of the geologic-tectonic structure and petroleum potential of the northern part of the Siberian Platform and the adjacent shelf of the Arctic zone are currently based on seismic data by the method of the common depth point (CDP), tied to the existing deep search and parametric wells. Representations of the deep structure and oil and gas potential of specific areas, the allocation of targeted promising oil and gas horizons can change dramatically as the depth of seismic acquisition of the method of the common depth point increases and the software for processing and interpreting seismic data is improved. The localized oil and gas resources of the north of the Siberian platform and adjacent shelf are 41017,3, subsequently, 27582,3 - onshore and offshore - 13435 MMT (million tons) of oil equivalent.

scholarly journals ПЕРСПЕКТИВЫ НЕФТЕГАЗОНОСНОСТИ СЕВЕРО- АБШЕРОНСКОГО АРХИПЕЛАГА ЮЖНО- КАСПИЙСКОЙ ВПАДИНЫ В СВЯЗИ С ТЕКТОНИЧЕСКИМ РАЗВИТИЕМ СТРУКТУР

2019 ◽  
pp. 16-22
Author(s):  
Насибова Г. Д. ◽  
Мухтарова Х. З.
Keyword(s):  
Oil And Gas ◽  
Deep Structure ◽  
Geophysical Methods ◽  
Seismic Exploration ◽  
The South ◽  
Gas Field ◽  
Foreign Companies ◽  
Oil And Gas Resources ◽  
Hydrocarbon Fields ◽  
Exploration Drilling

Over the past decades, discovery of giant hydrocarbon fields at the depth of above 10 km in the World oceans enables the possibility of identifying oil and gas at great depths of the South Caspian depression (SCD).The main oil and gas resources in this region are associated with the Productive Series (PS) -Red Series (RS) of the Lower Pliocene. Paleogene-Miocene and Mesozoic sediments in the southern Caspian are submerged to great depths, the prospects of their oil and gas potential are associated with the most uplifted tectonic zones.The Northern Absheron, that is considered as one of the promising areas of this region, covers the uplifts zone under the same name that is the most elevated tectonic unit of the South Caspian. The zone under consideration consists of two anticlinal lines, within which about 20 structures have been identified and explored. Currently, about 10 structures are covered by prospecting and exploration drilling and 5 prospective oil and gas structures have been identified: Absheron kupesi, Western Absheron, Novkhany, Ashrafi, Garabakh.Testing of exploration wells on the structures Gilavar, Hali, Arzu, Ashrafi, Mardakan-deniz and Oguz has not been positive. It should be noted that the deep structure of these uplifts is poorly studied by seismic exploration. Detailed integrated geophysical survey at modern technological and methodological levels is necessary to examine the relation of structural plans of sediments of various ages. The prospects oil and gas field exploration are associated with the lower part of the PS, Miocene, Cretaceous and Jurassic.It should be noted that despite negative conclusions of some foreign researchers on non-productiveness of the structures above, in recent years, the data obtained from the results of new geological and geophysical methods give SOCAR the basis to resume exploration drilling without involvement of foreign companies.

Investigating the role of Iberia and its interplay with the Newfoundland and Irish offshore margins using plate reconstructions

2020 ◽  
Author(s):  
Michael King ◽  
Kim Welford ◽  
Alexander Peace
Keyword(s):  
North Atlantic ◽  
Oil And Gas ◽  
Crustal Thickness ◽  
Temporal Variations ◽  
Gravity Inversion ◽  
Plate Tectonic ◽  
The West ◽  
Iberian Margin ◽  
Independent Motion

<p>The tectonic evolution of the southern North Atlantic is a subject of increasing interest due to its continental margins playing host to several world-class frontier regions for oil and gas exploration. The Newfoundland-Iberia conjugate margin pair serves as one of the best studied non-volcanic rifted conjugate margin pairs in the world, and is a topic of constant scientific debate due to its complex plate kinematic history and geological evolution.  Recent adaptability of the GPlates freely available plate tectonic reconstruction software provides an excellent tool for gaining insight into complex plate kinematic problems. The ability to account for regions of deformation, integration of various geological and geophysical datasets, and the ability to calculate temporal variations in crustal thickness, strain rates, and velocity vectors provide an optimal environment for solving crustal-scale geological and geophysical problems. Building upon previous rigid and deformable plate tectonic modelling studies, the aim of this work is to create deformable plate tectonic models of Iberia with emphasis on the West Iberian margin and the Pyrenees to assess Iberia’s evolution during the formation of the southern North Atlantic from 200 Ma to present day. A comparison of crustal thickness results calculated from GPlates models with those obtained from gravity inversion, passive and controlled source seismology, and geological field mapping, provided a good metric for investigating the plate kinematics of Iberia and assessing previous discrepancies when considering the crustal evolution of the West Iberian margin and the Pyrenees as an integrated plate kinematic system. Results from the GPlates models produced in this study also demonstrate the significance of continental fragments and their independent motion during rifting. In particular, we investigate the independent motion of the Galicia Bank and its role with respect to the deformation experienced within the Galicia Interior Basin and the role of the Ebro Block and Landes High during deformation prior to the Pyrenean Orogeny. In addition, this study highlights the importance of inherited structures with respect to the styles of deformation experienced during rifting of continental crust. Preliminary deformable plate modeling results of the West Iberian margin indicate that the independent motion of the Galicia Bank and its interplay with inherited structures is crucial for deriving the amount of deformation inferred by gravity inversion and regional seismic studies within the Galicia Interior Basin.</p>

scholarly journals GEOPHYSICAL STUDIES OF RING STRUCTURES FOR THE SEARCH FOR OIL AND GAS DEPOSITS

2021 ◽  
Vol 31 (3) ◽  
pp. 319-328
Author(s):  
A.L. Kharitonov
Keyword(s):  
Oil And Gas ◽  
Deep Structure ◽  
Geophysical Methods ◽  
Middle Urals ◽  
Geophysical Research ◽  
Central Type ◽  
The Middle Urals ◽  
Geophysical Interpretation ◽  
Ring Structures ◽  
Gas Fields

The purpose of this work is to show the possibilities of regional geomorphological and geological-geophysical methods for studying the tectonic and geomorphological features of the structure of central-type ring structures on the territory of the Middle Urals (Tatarstan, Udmurtia, Bashkiria, Kirov Region) and adjacent regions of the Komi-Permyat Autonomous Region, allowing to study the oil and gas prospects of these territories. According to the results of geological and geophysical interpretation of the data of magnetic exploration, gravity exploration and heat flow, the deep structure of the root inhomogeneities of the Voy-Vozhsky ring geomorphological structure of the central type, one of the analyzed in the territory of the Middle Urals, is shown. It is assumed that the intersection points of tectonic faults of the Earth's crust (geomorphological liniments) located in the side zones of circular geomorphological structures of the central type on the territory of the Middle Urals and adjacent regions can be promising objects of geological and geophysical research in search of oil deposits. Gas fields can be confined to the central zones ("pipes" of mantle degassing) of circular geomorphological structures of the central type.

scholarly journals Deep structure and metallogeny of the earth's crust

1989 ◽  
Vol 20 (2) ◽  
pp. 37
Author(s):  
V.A. Erkhow
Keyword(s):  
Crustal Structure ◽  
Upper Mantle ◽  
Deep Structure ◽  
Earth’S Crust ◽  
Magnetic Data ◽  
Crust And Upper Mantle ◽  
Geophysical Field ◽  
Deep Crust ◽  
Deep Crustal Structure ◽  
Earth's Crust

Considerable experience with integrated geological and geophysical studies has enabled definition of deep crustal structures and, within limits, composition and processes within the deep crust, and to determine their association with metallogeny in the USSR.By means of seismic experiments, stratification of the Earth's crust and the upper mantle to a depth of about 100 km has been revealed. Numerous heat flow data have been compiled. Magneto-telluric soundings made it possible to determine the position of conductive strata in the crust and upper mantle for a number of areas. Gravity surveys coupled with the results of seismic profiling enabled the finding of a number of empirical laws that are useful for investigation into the deep crust. Magnetic data analysis has enabled evaluation of the magnetic layering of the deep crust. Kimberlite and ore provinces can be considered examples of these concepts.For more detailed studies of deep crustal structure the territory of the USSR is the subject of a system of regional investigation of the deep crust and upper mantle. This system is based principally upon a network of interconnected regional profiles (geotraverses) tied to deep and superdeep boreholes. The system includes predicted geophysical observations to control investigation of the geophysical field data. The geotraverse network is the basis for detailed studies within the bounds of petroleum and ore provinces.The most accurate data obtained allows the formation of a crustal model and reveals empirical relationships with metallogeny.Based on the deep crustal structure data a regional oregenesis prediction map has been made. The endogenous mineralization prediction was based on special features of the upper layering of the crust and on data relating to deep crustal permeability zones.

Sign in / Sign up

Export Citation Format

Share Document