scholarly journals Refinement of the velocity section sedimentary stratum by the Nakamura method at new seismic stations of the IDG RAS

2020 ◽  
Vol 2 (4) ◽  
pp. 43-50
Author(s):  
Stanislav Tarasov ◽  
Andrey Goev ◽  
Sergey Volosov ◽  
Ella Gorbunova ◽  
Galina Ivanchenko ◽  
...  
Keyword(s):  
Deep Structure ◽  
Sedimentary Cover ◽  
Seismic Profile ◽  
Dominant Frequency ◽  
Geological Structure ◽  
Seismic Stations ◽  
East Europe ◽  
Velocity Section ◽  
Nakamura Method ◽  
Dominant Peak

In 2017, as part of a project to study the deep structure of the central part of the East Europe-an platform, IDG RAS staff installed a sub latitudinal seismic profile of about 500 km in length, consisting of six stations. To successfully solve the problem of restoring a deep velocity section, the fullest possible information is needed on the velocity characteristics of the sedimentary sequence and, in particular, the first 0.5-1 km. Despite the considerable knowledge of the geological structure of the Moscow syneclise, information about its speed structure is based on interpolation and is fragmentary in nature. The paper presents the results of studies of the upper part of the sedimentary cover of the central part of the East Eu-ropean Platform (EEP) according to the data of the new network of broadband seismic stations IDG RAS. Using seismic noise records for each station, the dominant frequency peaks were obtained by the Nakamura method. For the Mikhnevo and Shatura stations, based on the data of deep drilling, it was established that the dominant peak corresponds to the boundary of the Upper Devonian - Lower Carbonian sediments. The obtained results make it possible to trace the occurrence of the indicated boundary along with all stations of the network along with the sublatitudinal profile through the collision zone of the EEP.

The structure of the Southeastern part of the Yano-Kolyma Fold Belt by the results of interpretation of various scale magnetic data

2020 ◽  
Author(s):  
Denis Zubov ◽  
Kseniia Antashchuk ◽  
Alexey Atakov ◽  
Kirill Mazurkevich ◽  
Marina Petrova
Keyword(s):  
System Analysis ◽  
Deep Structure ◽  
Sedimentary Cover ◽  
Volcanic Belt ◽  
Geological Structure ◽  
Magnetic Data ◽  
Fold Belt ◽  
Southeastern Part ◽  
Wide Range ◽  
Tectonic Settings

<p>The wide range of anomalies caused by different geological structures from local to regional are studied by the heterogeneous datasets. They usually include the surveys of highly variable scales, resolution and quality. These parameters determine the methodology and technique used in further interpretation. The absence of detail and high quality surveys of geomagnetic field for large areas does not allow the implementation of the system analysis approach to full spectra of anomalies of magnetic field. The possibilities of system analysis using for various scale magnetic surveys to clarify of the tectonic settings and geological structure of the southeastern part of the Yano-Kolyma fold belt are considered. The geological structure of this area was studied earlier by the seismic and magnetotelluric investigations along 2DV regional profile. The tectonic settings are represented by several folded areas and cratons which are covered and knit together by Late Mesozoic bends and volcanic belt. The system interpretation of various scale magnetic surveys allowed us to obtain the geological and tectonic models of this area that include the following principal components: the deep structure of joint zones of different tectonic blocks; the structure and thickness of Paleozoic – Mesozoic deposits of sedimentary cover, crystalline basement and bends; the structure of volcanic belt deposits.</p>

scholarly journals The structure of the sedimentary complex of the Middle and South Caspian depressions (Azerbaijan sector)

2021 ◽  
Vol 43 (4) ◽  
pp. 199-216
Author(s):  
N.P. Yusubov ◽  
I.S. Guliyev
Keyword(s):  
Seismic Data ◽  
Oil And Gas ◽  
Sedimentary Cover ◽  
Clay Content ◽  
Geological Structure ◽  
Point Of View ◽  
South Caspian Basin ◽  
Origin And Evolution ◽  
Geological Interpretation ◽  
High Degree

The high degree of knowledge of the upper horizons of the sedimentary cover of the Middle and South Caspian depressions, given an insufficient increase in hydrocarbon reserves, leads to the need for a detailed approach to the search for oil and gas deposits in deep-seated sediments (over 6 km). During the geological interpretation of new highly informative seismic data, as well as data of deep drilling and petrological core studies, there were revealed obvious shortcomings in the concepts of the origin and evolution of the Middle and South Caspian depressions. These ideas misinterpret evolution, especially the South Caspian Basin, which is characterized by a number of unique features: very thick sedimentary cover (up to 22 km), extremely high sedimentation rate, low heat flow and reservoir temperatures, abnormally high pore and reservoir pressures, high clay content of the section, etc. The main purpose of the study was to elucidate the regional structure and features of the dissection of the sedimentary cover of the Middle and South Caspian depressions, the conditions of occurrence and distribution of facies and thicknesses of individual complexes of deposits. The paper analyzes the results of some previous studies of the geological structure of the Middle and South Caspian depressions based on the data of deep seismic sounding, seismological and gravimetric observations. We consider the main conclusions of these studies, about the geological structure of the sedimentary complex of the region’s, very outdated and subject to revision. The results of seismic stratigraphic analysis of seismic data allowed the authors to identify new data about the tectonic structure and express a completely different point of view regarding the structure of the sedimentary cover in the region. The work also touches on the issue associated with the tectonics of the region and the alleged subduction zone here.

scholarly journals GEOLOGICAL AND GEOPHYSICAL CHARACTERISTICS OF THE ANABAR‐KHATANGA OIL AND GAS PROVINCE; NUMERICAL MODELING OF THE PROCESSES OF FORMATION OF SALT DOMES (SIBERIAN SECTOR OF THE RUSSIAN ARCTICS)

2019 ◽  
Vol 10 (2) ◽  
pp. 459-470
Author(s):  
V. A. Kontorovich ◽  
В. V. Lunev ◽  
V. V. Lapkovsky
Keyword(s):  
Cross Sections ◽  
Oil And Gas ◽  
Numerical Models ◽  
Sedimentary Cover ◽  
Ground Surface ◽  
Geological Structure ◽  
Salt Domes ◽  
Software Packages ◽  
Geological Features ◽  
Gas Bearing

The article discusses the geological structure, oil‐and‐gas‐bearing capacities and salt tectogenesis of the Anabar‐Khatanga saddle located on the Laptev Sea shore. In the study area, the platform sediments are represented by the 14‐45 km thick Neoproterozoic‐Mesozoic sedimentary complexes. The regional cross‐sections show the early and middle Devonian salt‐bearing strata and associated salt domes in the sedimentary cover, which may be indicative of potential hydrocarbon‐containing structures. Diapirs reaching the ground surface can be associated with structures capable of trapping hydrocarbons, and typical anticline structures can occur above the domes buried beneath the sediments. In our study, we used the algorithms and software packages developed by A.A. Trofimuk Institute of Petroleum Geology and Geophysics (IPGG SB RAS). Taking into account the structural geological features of the study area, we conducted numerical simulation of the formation of salt dome structures. According to the numerical models, contrasting domes that reached the ground surface began to form in the early Permian and developed most intensely in the Mesozoic, and the buried diapirs developed mainly in the late Cretaceous and Cenozoic.

scholarly journals Deep structure of the Anapa flexural-rupture zone, Western Caucasus

2019 ◽  
pp. 3-11
Author(s):  
E. A. Rogozhin ◽  
A. V. Gorbatikov ◽  
Yu. V. Kharazova ◽  
M. Yu. Stepanova ◽  
J. Chen ◽  
...  
Keyword(s):  
Deep Structure ◽  
Sedimentary Cover ◽  
Western Caucasus ◽  
Tectonic Structures ◽  
Deep Roots ◽  
Near Surface ◽  
North West ◽  
The North ◽  
Deep Faults ◽  
Tectonic Zones

In the period from 2007 to 2017 complex geological and geophysical studies were carried out in the three largest flexural-rupture fault zones in the North-West Caucasus (Anapa, Akhtyrka and Moldavan). The micro-seismic sounding (MSM) was used as the main geophysical method. Studies with the help of MSM allowed us to identify the features of the deep structure of the earth’s crust in the study area and to associate them with specific tectonic structures on the surface.The binding was carried out by harmonizing the results of the MSM and the parameters of the section of the sedimentary cover and crustal boundaries according to the drilling data and the work previously performed by the reflected wave method (MOVZ). It was found that the Anapa flexure and longitudinal tectonic zones have clear deep roots, and also separate the pericline of the North-Western Caucasus from the Taman Peninsula and from the lowered blocks of the Northern slope of the folded system.Faults in the study area are divided into: (1) deep faults of the Caucasian stretch, penetrating into the lower crust and even to the upper mantle, and (2) near-surface faults, do not extend to the depths beyond the thickness of the sedimentary cover. The seismogenic role of these tectonic disturbances in the studied seismically active region has been determined.

scholarly journals Сomposition of volcanites from pre-Jurassic basement of the Western Siberian megabasin (Lakyuganskaya oil exploration area, YNAD)

2020 ◽  
Vol 1 (2) ◽  
pp. 7-19
Author(s):  
Vladimir Sergeevich PONOMAREV ◽  
◽  
Kirill Svyatoslavich IVANOV ◽  
Yuriy Viktorovich EROKHIN ◽  
◽  
...  
Keyword(s):  
Oil And Gas ◽  
Sedimentary Cover ◽  
Geological Structure ◽  
Island Arcs ◽  
Copper Sulfides ◽  
Geochemical Study ◽  
Dioctahedral Mica ◽  
Exploration Area ◽  
Gas Potential ◽  
First Time

Relevance of the work. The Western Siberian megabasin is the main source of oil and gas in Russia. Therefore, the study of geological structure and evolution of the development of sedimentary cover rock complexes and the basement of the region is important for estimating the oil and gas potential of this vast territory. The object of this paperis the mineralogical and petro-geochemical study of volcanites from the pre-Jurassic basement of the Lakyuganskaya area (well no. 101) of the Longyugansk exploration acreage within the territory of the Nadym megadepression of the Western Siberian megabasin. Scope of work. This work can be useful when constructing geological maps of the basement of the northern part of the Western Siberian Plate. Results and conclusions. We have studied and described the mineralogy of strongly altered volcanites from the pre-Jurassic basement of the Lakyugansk area (well no. 101) of the Western Siberian Plate. According to chemical composition, the studied volcanites are classified as moderate and high potassic basalts, andesite-basalts and andesites. The rocks were subjected to significant secondary changes in the mineral composition, such as greenschist metamorphism and propylitization. Only titanomagnetite has been preserved from primary minerals in volcanites; all other minerals were subjected to changes. In general, we have determined the following minerals – albite, clinochlore, titanite, calcite, goethite, titanomagnetite (magnetite, ulvospinel), fluorapatite, and rutile. For the first time, ferroaluminoceladonite (dioctahedral mica) and three relatively rare secondary copper sulfides – spionkopite, yarrowite, and geerite – were identified and described in basalts from the basement of Western Siberia. Sulfide coppery mineralization in the studied basalts was due to overlapped propylization processes. The rocks have features of volcanites of island arcs, as well as evidence of calc-alkali and intraplate basalts. The petrological and geochemical characteristics of the studied volcanites are similar to basalts composing the Koltogorsko-Urengoysky rift of the Western Siberian Plate.

Walkabove VSP with seismic-while-drilling technology: flawless operation in a highly deviated well

2013 ◽  
Vol 53 (2) ◽  
pp. 454
Author(s):  
Adrian Cristian Sanchez Rodriguez ◽  
Leon Dahlhaus ◽  
Konstantin Galybin ◽  
Andrew Vigor ◽  
Grant Skinner ◽  
...  
Keyword(s):  
Seismic Profile ◽  
Geological Structure ◽  
Surface Source ◽  
North West ◽  
The North ◽  
Bottom Hole ◽  
Surface Time ◽  
Drilling Technology ◽  
Bottom Hole Assembly

SWD was recently used in the North West Shelf of Australia to acquire time-depth measurements and to obtain a vertical seismic profile (VSP) while pulling out of hole. The use of SWD technology greatly enhanced the understanding of geology by acquiring a more precise geophysical picture of the subsurface, leading to better understanding of the subsurface and placement of wells in the future. A vertical incidence VSP was acquired in an offshore deviated well for a client on the Australian North West Shelf. The data was acquired using a moving-surface source, suspended from a boat, and a four-component downhole sensor in the bottom hole assembly (BHA). The downhole data was acquired using three orthogonal geophones and a single hydrophone measurement at each VSP level. This was recorded while pulling out of hole, and processed once the tool was on surface. Time picking accuracy of the downhole data is ±0.5 ms with the frequency range 6–90Hz, both comparable to Wireline. The repeatability of the hydrophone and geophone time picks was also excellent with the average difference being 0.2 ms and maximum 0.8 ms. High resolution VSP images beneath the well in addition to corridor stacks were derived from the geophone and hydrophone data, showing the geological structure of the reservoir. The quality of the data acquired allowed the client to remove the need for a wireline VSP run; it, therefore, saved significant rig time and costs associated with it, reduced the chances of getting stuck, and significantly reduced the seismic uncertainty.

Geometrical considerations in the acquisition of borehole interferometric data for imaging near-vertical features: Design of field experiments

Geophysics ◽  
2013 ◽  
Vol 78 (3) ◽  
pp. K1-K10 ◽  
Author(s):  
Emma Brand ◽  
Charles Hurich ◽  
Sharon Deemer
Keyword(s):  
Stationary Phase ◽  
Field Experiments ◽  
Hard Rock ◽  
Critical Role ◽  
Seismic Profile ◽  
Dominant Frequency ◽  
Critical Parameters ◽  
Seismic Interferometry ◽  
Surface Source ◽  
Major Factors

Seismic interferometry applied to walkaway vertical seismic profile data has significant potential for imaging the steeply dipping structures often encountered in hard-rock minerals exploration. Using the interferometry process, surface shots can be redatumed to the borehole receivers resulting in virtual shot gathers. The virtual shot gathers can then be processed using a standard common midpoint (CMP) processing flow. Carrying out this procedure for a subvertical borehole results in a geometry that is optimal for imaging structures that are near vertical. Field acquisition parameters play a critical role in recovering reliable virtual source images. We evaluated the major factors that play a role in designing a field acquisition program with the objective of providing guidance to field practitioners. The major issue to be considered is insuring that correlation gathers created in the interferometry process have a stationary phase component that when summed produces events with correct timing and cancellation of nonstationary components. Consistent with previous work, the ray-tracing-based analysis identified the surface source spacing, surface source aperture, and dominant frequency as the most critical parameters. The analysis indicated that because of the high apparent velocities typically encountered in hard rock terrains, a surface source spacing of 20 m and an aperture of 1000 m will result in stationary phase components and avoid spatial alias in the correlation gathers for frequencies as high as 80 Hz. However, closer spacing of the surface sources provided more traces in the correlation gathers resulting in fewer artifacts during summation. These results were further verified by acoustic wave modeling that provided data from more complex targets that were processed through a complete interferometry and CMP flow. The analysis indicated that with care in designing field acquisition parameters, seismic interferometry is realizable within the terrain and access restrictions imposed by many mining camps.

Overview of seismic methods for Urban Underground Space

2020 ◽  
pp. 1-64
Author(s):  
Zhenning Ma ◽  
Rongyi Qian
Keyword(s):  
Urban Space ◽  
Active Faults ◽  
Seismic Profile ◽  
Geological Structure ◽  
Underground Space ◽  
Underground Engineering ◽  
Active Source ◽  
Seismic Methods ◽  
Ambient Noise Method ◽  
Wave Methods

The development of Urban Underground Space (UUS) has become an effective way to solve the problem of urban space. Seismic methods have achieved good results in underground engineering construction, active faults detection, urban geological structure detection and other fields. Active source seismic methods in UUS include reflection methods, refraction methods, surface wave methods and vertical seismic profile (VSP) methods and so on. Ambient noise method is also rising gradually, which becomes an important method of urban underground space detection in the future, because it overcomes the problem that the active source method is interfered by urban noise. We briefly summarize these methods and introduce the application examples of UUS.

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