Geological Structure of The Pre-Jurassic Complex Within The Elizarovsky Trough of The Frolov Megadepression and The Galyanovsky Nose of The Krasnoleninsky Arch According to Seismic Data CDP 3D

AbstractThis article presents the results of an integrated interpretation of measurements made using Audio-Magnetotellurics and Seismic Reflection geophysical methods. The obtained results were used to build an integrated geophysical model of shallow subsurface cover consisting of Cenozoic deposits, which then formed the basis for a detailed lithological and tectonic interpretation of deeper Mesozoic sediments. Such shallow covers, consisting mainly of glacial Pleistocene deposits, are typical for central and northern Poland. This investigation concentrated on delineating the accurate geometry of Obrzycko Cenozoic graben structure filled with loose deposits, as it was of great importance to the acquisition, processing and interpretation of seismic data that was to reveal the tectonic structure of the Cretaceous and Jurassic sediments which underly the study area. Previously, some problems with estimation of seismic static corrections over similar grabens filled with more recent, low-velocity deposits were encountered. Therefore, a novel approach to estimating the exact thickness of such shallow cover consisting of low-velocity deposits was applied in the presented investigation. The study shows that some alternative geophysical data sets (such as magnetotellurics) can be used to significantly improve the imaging of geological structure in areas where seismic data are very distorted or too noisy to be used alone

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Reconstruction of the Reservoir Fine Structure by Using Scattering Attributes

10.2118/206083-ms ◽

2021 ◽

Author(s):

Vladimir Cheverda ◽

Vadim Lisitsa ◽

Maksim Protasov ◽

Galina Reshetova ◽

Andrey Ledyaev ◽

...

Keyword(s):

Seismic Data ◽

Numerical Experiments ◽

Seismic Waves ◽

Fractured Reservoirs ◽

Three Dimensional ◽

Geological Structure ◽

Discrete Elements ◽

Digital Twin ◽

The North ◽

Slip Surfaces

Abstract To develop the optimal strategy for developing a hydrocarbon field, one should know in fine detail its geological structure. More and more attention has been paid to cavernous-fractured reservoirs within the carbonate environment in the last decades. This article presents a technology for three-dimensional computing images of such reservoirs using scattered seismic waves. To verify it, we built a particular synthetic model, a digital twin of one of the licensed objects in the north of Eastern Siberia. One distinctive feature of this digital twin is the representation of faults not as some ideal slip surfaces but as three-dimensional geological bodies filled with tectonic breccias. To simulate such breccias and the geometry of these bodies, we performed a series of numerical experiments based on the discrete elements technique. The purpose of these experiments is the simulation of the geomechanical processes of fault formation. For the digital twin constructed, we performed full-scale 3D seismic modeling, which made it possible to conduct fully controlled numerical experiments on the construction of wave images and, on this basis, to propose an optimal seismic data processing graph.

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

Geofizicheskiy Zhurnal ◽

10.24028/gzh.v43i4.239970 ◽

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.

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3D PETROPHYSICS FOR HAWE: CASE STUDIES

10.30632/spwla-2021-0055 ◽

2021 ◽

Author(s):

Alexander Kolomytsev ◽

◽

Yulia Pronyaeva Pronyaeva ◽

Keyword(s):

Case Studies ◽

Seismic Data ◽

Reservoir Characterization ◽

Vertical Direction ◽

Geological Structure ◽

Current Layer ◽

Radial Model ◽

The Difference ◽

Geological Concept ◽

Property Changes

Most conventional log interpretation technics use the radial model, which was developed for vertical wells and work well in them. But applying this model to horizontal wells can result in false conclusions. The reasons for this are property changes in vertical direction and different depth of investigation (DOI) of logging tools. DOI area probably can include a response from different layers with different properties. All of this complicates petrophysical modeling. The 3D approach for high angle well evaluation (HAWE) is forward modeling in 3D. For this modeling, it is necessary to identify the geological concept near the horizontal well section using multiscale data. The accuracy of modeling depends on the details of the accepted geological model based on the data of borehole images, logs, geosteering inversion, and seismic data. 3D modeling can be applied to improve the accuracy of reservoir characterization, well placement, and completion. The radial model is often useless for HAWE because LWD tools have different DOI and the invasion zone was not formed. But the difference between volumetric and azimuthal measurements is important for comprehensive interpretation because various formations have different properties in vertical directions. Resistivity tools have the biggest DOI. It is important to understand and be able to determine the reason for changes in log response: a change in the properties of the current layer or approaching the layers with other properties. For this, it is necessary to know the distance to the boundaries of formations with various properties and, therefore, to understand the geological structure of the discovered deposits, and such information on the scale of well logs can be obtained either by modeling or by using extra deep resistivity inversion (mapping). The largest amount of multidisciplinary information is needed for modeling purposes - from images and logs to mapping and seismic data. Case studies include successful examples from Western Siberia clastic formations. In frame of the cases, different tasks have been solved: developed geological concept, updated petrophysical properties for STOIIP and completion, and provided solutions during geosteering. Multiscale modeling, which includes seismic, geosteering mapping data, LWD, and imagers, has been used for all cases.

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New insights into the geological structure of the Netherlands; results of a detailed mapping project

Netherlands Journal of Geosciences – Geologie en Mijnbouw ◽

10.1017/s0016774600000329 ◽

2012 ◽

Vol 91 (4) ◽

pp. 419-446 ◽

Cited By ~ 30

Author(s):

H. Kombrink ◽

J.C. Doornenbal ◽

E.J.T. Duin ◽

M. den Dulk ◽

J.H. ten Veen ◽

...

Keyword(s):

Standard Deviation ◽

The Netherlands ◽

Seismic Data ◽

Geological Structure ◽

Geological Mapping ◽

3D Seismic ◽

Structural Element ◽

Potential Reservoir ◽

3D Seismic Data ◽

New Reservoir

AbstractA five years geological mapping project, in which the Netherlands Continental Shelf has been re-examined using all publicly available data, resulted in an important update of the existing dataset. The stratigraphy of over 400 wells has been re-interpreted. New depth and thickness grids, based mainly on the interpretation of 3D seismic data have been produced for the most important stratigraphic intervals from Permian Upper Rotliegend to Neogene. New reservoir grids describe the top, base and thickness of 30 (potential) reservoir units in the area. In addition, the uncertainty related to interpretation and further processing of the data has been assessed. This resulted in maps displaying the standard deviation for the depth of the main stratigraphic intervals. Based on these results and the data already available for the onshore area, an updated structural element map was made for the Netherlands.

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Random noise attenuation using f-x regularized nonstationary autoregression

Geophysics ◽

10.1190/geo2011-0117.1 ◽

2012 ◽

Vol 77 (2) ◽

pp. V61-V69 ◽

Cited By ~ 89

Author(s):

Guochang Liu ◽

Xiaohong Chen ◽

Jing Du ◽

Kailong Wu

Keyword(s):

Seismic Data ◽

Random Noise ◽

Geological Structure ◽

Least Square ◽

Noise Attenuation ◽

Spatial Direction ◽

Random Noise Attenuation ◽

Time Space ◽

Prediction Technique ◽

Domain Prediction

We have developed a novel method for random noise attenuation in seismic data by applying regularized nonstationary autoregression (RNA) in the frequency-space ([Formula: see text]) domain. The method adaptively predicts the signal with spatial changes in dip or amplitude using [Formula: see text] RNA. The key idea is to overcome the assumption of linearity and stationarity of the signal in conventional [Formula: see text] domain prediction technique. The conventional [Formula: see text] domain prediction technique uses short temporal and spatial analysis windows to cope with the nonstationary of the seismic data. The new method does not require windowing strategies in spatial direction. We implement the algorithm by an iterated scheme using the conjugate-gradient method. We constrain the coefficients of nonstationary autoregression (NA) to be smooth along space and frequency in the [Formula: see text] domain. The shaping regularization in least-square inversion controls the smoothness of the coefficients of [Formula: see text] RNA. There are two key parameters in the proposed method: filter length and radius of shaping operator. Tests on synthetic and field data examples showed that, compared with [Formula: see text] domain and time-space domain prediction methods, [Formula: see text] RNA can be more effective in suppressing random noise and preserving the signals, especially for complex geological structure.

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Methods of Fault Modeling by Well-to-Seismic Integration

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.733.178 ◽

2015 ◽

Vol 733 ◽

pp. 178-181

Author(s):

Peng Yan Wang ◽

Yao Hua Li ◽

Ze Yu Li

Keyword(s):

Seismic Data ◽

Digital Simulation ◽

Fault Modeling ◽

Geological Structure ◽

Fault Model ◽

Structure Modeling ◽

Structure Model ◽

Important Work ◽

Body Checking ◽

Property Modeling

Geological structure model is the foundation of the sedimentary faces modeling, property modeling and digital simulation, which includes the horizon model and fault model. Fault model which is accorded with underground conditions plays an important role in the structure modeling, so it would be an important work to build the fault model perfectly with the seismic and logging data. This paper take the fault modeling of C84-6 well area in Chaoyanggou field as an example, building the fault model by four methods of ‘Projection of polygon’ ‘Correction of depth domain seismic body’ ‘Checking by overlooking’ ‘Correction of breakpoints’ by the software of Petrel. The fault model which is built by integrating logging and seismic data can be the skeleton to build the final geological structure model, and those methods mentioned in this paper has been applied to the modeling work in some adjacent areas at present.

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PERBAIKAN CITRA PENAMPANG SEISMIK MENGGUNAKAN METODE COMMON REFLECTION SURFACE : APLIKASI TERHADAP DATA SEISMIK PERAIRAN WAIGEO

JURNAL GEOLOGI KELAUTAN ◽

10.32693/jgk.13.2.2015.267 ◽

2016 ◽

Vol 13 (2) ◽

pp. 119

Author(s):

Subarsyah Subarsyah ◽

Yulinar Firdaus

Keyword(s):

Seismic Data ◽

Geological Structure ◽

Aperture Size ◽

Seismic Section ◽

Acoustic Basement ◽

Data Line ◽

Common Reflection Surface

Kenampakan struktur geologi dan kontinuitas reflektor pada penampang seismik seringkali tidak teridentifikasi ketika data seismik di stack menggunakan metode stacking konvensional, terutama untuk data dengan jumlah fold coverage yang kecil. Data seismik Puslitbang Geologi Kelautan yang diperoleh pada Mei 2015, di Perairan Timur Pulau Waigeo, memiliki fold coverage yang relatif rendah sekitar 20. Untuk meningkatkan kualitas penampang seismik pada data ini perlu diterapkan metode Common Reflection Surface(CRS) sehingga interpretasi struktur geologi lebih mudah dan kontinuitas reflektor lebih baik. Metode ini diaplikasikan terhadap data seismik lintasan 6 dan 37. Penerapan metode CRS memberikan perbaikan pada citra penampang seismik terutama pada bagian basement akustik dan kontinuitas reflektor. Metode ini memberikan citra penampang seismik yang relatif lebih baik dibandingkan metode stacking konvensional karena metode CRS melibatkan trace seismik dari CDP di sekitarnya sesuai dengan besar parameter aperturnya. Kata kunci CRS Stack, CRS Attribut dan Paraxial Geological structure and reflector continuity on seismic section are often not clearly identified when the seismic data stacked use conventional stacking, especially seismic data with small fold coverage. Seismics data of Puslitbang Geologi Kelautan, that have been acquired on Mei 2015,in eastern part of Waigeo Island, have small number of fold coverage about 20. To enhance quality of seismic section on this data, it is necessary to apply Common Reflection Surface (CRS) method, in order to make geological structure interpretation easier dan better reflector continuity. This method applied to seismic data line 6 and 37. This application gives enhancement to seismic section especially at acoustic basement and reflector continuity. CRS method gives better seismic section than conventional stacking due to stacking process that involve seismic trace around the CDP along its aperture size. Keywords: CRS Stack, CRS Attribut and Paraxial

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Myths About Reefs. Experience in the Investigation of the Geological Structure of Carbonate Deposits Using Seismic Data

GeoBaikal 2018 ◽

10.3997/2214-4609.201802074 ◽

2018 ◽

Author(s):

E.V. Khromova ◽

A.S. Shcherbakova ◽

A.S. Zhelezova ◽

A.V. Maksyutova ◽

D.M. Fodorova ◽

...

Keyword(s):

Seismic Data ◽

Geological Structure ◽

Carbonate Deposits

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Structure of the Canadian Cordillera from Seismic Refraction and Other Data

Canadian Journal of Earth Sciences ◽

10.1139/e75-018 ◽

1975 ◽

Vol 12 (2) ◽

pp. 182-208 ◽

Cited By ~ 35

Author(s):

M. J. Berry ◽

D. A. Forsyth

Keyword(s):

Seismic Data ◽

Seismic Refraction ◽

Vancouver Island ◽

Geological Structure ◽

Canadian Cordillera ◽

Low Velocity ◽

Model Calculations ◽

Plutonic Complex ◽

Coast Plutonic Complex ◽

Crustal Density

A synthesis of Canadian Cordilleran refraction data recorded prior to 1971 with other geophysical data shows major features which correlate well with the regional geological structure. The wavelength of M topography decreases from about 200 km at 54°N to about 110 km at 52°N and culminates in a major lithospheric discontinuity east of Vancouver Island. The seismic data indicate the region of the Fraser River at Quesnel, the region immediately east of and parallel to the Coast Plutonic Complex and possibly the western edge of the Hazelton Mountains are sites of significant changes in lithospheric structure.Lateral variations in the average crustal density are necessary to reconcile both gravity and seismic data. The crust beneath the central, intermontane region is characterized by a mass deficiency, whereas the density of the crust beneath Vancouver Island appears greater than average.Calculation of synthetic record sections shows that the Pn phase may propagate considerably beyond crossover in a layer a few wavelengths thick. A model for the Canadian Cordillera which includes a low velocity layer as little as 8 km below the M appears plausible. Model calculations suggest that the M approximates a discontinuity beneath the Coast Plutonic Complex, but is better modelled as a transition zone beneath the Omineca Crystalline belt.

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