Introduction to this special section: Seismic interpretation

2021 ◽  
Vol 40 (7) ◽  
pp. 482-483
Author(s):  
Heather Bedle ◽  
Jean-Paul van Gestel
Keyword(s):  
Seismic Data ◽  
Special Section ◽  
Seismic Interpretation ◽  
Hard Work ◽  
Making Sense

Seismic interpretation is the end game to our seismic data experiment. This is where all the hard work from seismic theory, modeling, acquisition, processing, and analysis comes together at the desks of the interpreters. They now have the ultimate task of making sense of these data to create and interpret geologically sensible models; build a coherent story regarding the trap, seal, and timing; find the in-fill target with enough remaining resources to be economical; and design the simplest and lowest-risk wellbore. In general, the interpreters provide a better understanding of the subsurface rocks and the risks and uncertainties associated with the interpretation.

scholarly journals Application of seismo-stratigraphic interpretation techniques to offshore West Greenland

1988 ◽  
Vol 140 ◽  
pp. 64-66
Author(s):  
J.A Chalmers
Keyword(s):  
Pilot Study ◽  
Seismic Data ◽  
Seismic Interpretation ◽  
Shelf Break ◽  
The West ◽  
Regional Geology ◽  
West Greenland ◽  
Oil Companies ◽  
Greenland Basin ◽  
Basement Ridge

A pilot study is being conducted to determine if the use of seismo-stratigraphic interpretation techniques can increase the understanding af the geology of offshore West Greenland in order to reassess the prospectivity of the area. During the period 1975 to 1979, a number of concessions offshore West Greenland were licensed to various consortia of oil companies to search for petroleum. Some 40 000 km of seismic data were acquired, all of which is now released. Five wells were drilled, all of them dry, and all concessions were relinquished by the industry by 1979. The regional geology of offshore West Greenland has been summarised by Manderscheid (1980) and Henderson et al. (1981). They show the West Greenland Basin to consist of fairly uniformly westward dipping sediments bordered near the shelf break by a basement ridge. These authors used what may be termed 'conventional' techniques of seismic interpretation. However, since that time the techniques of seismo-stratigraphy (Vail et al., 1977; Hubbard et al., 1985) have become established. They are now being applied to study seismic data acquired during the mid-1970s.

scholarly journals The “Children of Crisis”: Making Sense of (Post)socialism and the End of Yugoslavia

2017 ◽  
Vol 31 (3) ◽  
pp. 500-517 ◽  
Author(s):  
Ljubica Spaskovska
Keyword(s):  
Political Culture ◽  
Special Section ◽  
The State ◽  
Making Sense ◽  
The Media ◽  
Conservative Values ◽  
Socialist Politics

This article is part of the special section titled The Genealogies of Memory, guest edited by Ferenc Laczó and Joanna Wawrzyniak The article traces certain mnemonic patterns in the ways individuals who belonged to the late-socialist Yugoslav youth elite articulated their values in the wake of Yugoslavia’s demise and the ways they make sense of the Yugoslav socialist past and their generational role a quarter of a century later. It detects narratives of loss, betrayed hopes, and a general disillusionment with politics and the state of post-socialist democracy that appear to be particularly frequent in the testimonies of the media and cultural elites. They convey a sense of discontent with the state of post-Yugoslav democracy and with the politicians—some belonging to the same generation—who embraced conservative values and a semi-authoritarian political culture. The article argues that an emerging new authoritarianism and the very process of progressive disillusionment with post-socialist politics allowed for the emergence and articulation of such alternative, noninstitutionalized individual memories that, whilst not uncritical of the Yugoslav past, tend to highlight its positive aspects.

Introduction to special section: Seismic interpretation of contourites and deep-water sediment waves

2021 ◽  
Vol 9 (2) ◽  
pp. SBi-SBii
Author(s):  
Dallas B. Dunlap ◽  
Piotr Krzywiec ◽  
Christian Hübscher ◽  
Gabriel Tagliaro ◽  
F. Javier Hernandez Molina
Keyword(s):  
Deep Water ◽  
Special Section ◽  
Seismic Interpretation ◽  
Sediment Waves

Introduction to special section: Working with 2D seismic data

2019 ◽  
Vol 7 (3) ◽  
pp. SGi-SGii
Author(s):  
Donald A. Herron ◽  
Timothy E. Smith ◽  
Rachel T. Newrick ◽  
Brian W. Horn ◽  
Cian O’Reilly
Keyword(s):  
Seismic Data ◽  
Special Section

Coherence based on spectral variance analysis

Geophysics ◽  
2018 ◽  
Vol 83 (3) ◽  
pp. O55-O66 ◽  
Author(s):  
Yanting Duan ◽  
Chaodong Wu ◽  
Xiaodong Zheng ◽  
Yucheng Huang ◽  
Jian Ma
Keyword(s):  
Fourier Transform ◽  
Seismic Data ◽  
High Frequency ◽  
Seismic Interpretation ◽  
Variance Analysis ◽  
Frequency Spectra ◽  
Amplitude Spectra ◽  
Frequency Components ◽  
Spectral Variance ◽  
Coherence Estimation

The eigenstructure-based coherence attribute is a type of efficient and mature tool for mapping geologic edges such as faults and/or channels in the 3D seismic interpretation. However, the eigenstructure-based coherence algorithm is sensitive to low signal-to-noise ratio seismic data, and the coherence results are affected by the dipping structures. Due to the large energy gap between the low- and high-frequency components, the low-frequency components play the principal role in coherence estimation. In contrast, the spectral variance balances the difference between the low- and high-frequency components at a fixed depth. The coherence estimation based on amplitude spectra avoids the effect of the time delays resulting from the dipping structures. Combining the spectral variance with the amplitude spectra avoids the effect of dipping structures and enhances the antinoise performance of the high-frequency components. First, we apply the short-time Fourier transform to obtain the time-frequency spectra of seismic data. Next, we compute the variance values of amplitude spectra. Then, we apply the fast Fourier transform to obtain the amplitude spectra of spectral variance. Finally, we calculate the eigenstructure coherence by using the amplitude spectra of spectral variance as the input. We apply the method to the theoretical models and practical seismic data. In the Marmousi velocity model, the coherence estimation using the amplitude spectra of the spectral variance as input shows more subtle discontinuities, especially in deeper layers. The results from field-data examples demonstrate that the proposed method is helpful for mapping faults and for improving the narrow channel edges’ resolution of interest. Therefore, the coherence algorithm based on the spectral variance analysis may be conducive to the seismic interpretation.

SEISMIC INTERPRETATION AIDED BY THE COMPUTER

1973 ◽  
Vol 13 (1) ◽  
pp. 104
Author(s):  
H. R. Irrgang ◽  
I. L. Burnet
Keyword(s):  
Seismic Data ◽  
Seismic Interpretation ◽  
Performance Ratio ◽  
Focused Attention ◽  
Price Performance ◽  
Interpretation System ◽  
Interpretation Systems

The need to rapidly evaluate the immense quantity of seismic data being acquired by marine and land crews has focused attention on the development of an interactive seismic interpretation system using computer technology.Improvements in hardware and software and in the price/ performance ratio of computers make them more accessible for routine interpretation procedures.Advances in the development of interactive interpretation systems allow the geophysicist to exercise more control over the contouring, datuming, and other functions as the interpretations proceed. He can view graphically the results of major or minor changes in various parameters and their effects on the overall interpretation. Most important, the geophysicist has more time to apply his skills and experience to developing technically and geologically sound evaluations of areas or prospects.

Multidirectional eigenvalue-based coherence attribute for discontinuity detection

Geophysics ◽  
2021 ◽  
pp. 1-48
Author(s):  
Binpeng Yan ◽  
Ruirui Fang ◽  
Xingguo Huang ◽  
Weiming Ou
Keyword(s):  
Physical Model ◽  
Seismic Data ◽  
Field Data ◽  
Seismic Interpretation ◽  
Covariance Matrices ◽  
The Other ◽  
Computationally Efficient ◽  
Discontinuity Detection ◽  
Geological Discontinuities ◽  
Parallel Direction

The conventional coherence attribute is typically applied to migrated full-stacked seismic data volumes to detect geological discontinuities. Recently, multispectral, multiazimuth, and multioffset coherence attributes have been proposed and implemented with different seismic data volumes of specific frequencies, azimuths, and offsets to enhance discontinuities. Generally, geological anomalies, such as faults and channels, will be better illuminated by a perpendicular rather than a parallel direction for computation. Therefore, we propose a multidirectional eigenvalue-based coherence attribute by establishing multiple covariance matrices along certain different directions on a single post-stack volume. We adopt two methods to compute multidirectional coherence attribute. One is to compute multiple coherence volumes in different directions and to define the minimum as the final multidirectional coherence. This method is time-consuming, but could provide partial and overall discontinuity simultaneously. The other method obtains one coherence volume by summing covariance matrices in different directions, which is computationally efficient, but only provides overall discontinuity. The performance of 3D physical model and field data volumes demonstrates that multidirectional coherence can highlight subtle geologic structures with a higher resolution than conventional coherence. This suggests that multidirectional coherence attribute may serve as an effective tool for detecting the distribution of geologic discontinuities in seismic interpretation.

scholarly journals A preliminary seismic interpretation of an area with extensive Tertiary basalts offshore central West Greenland

1996 ◽  
Vol 172 ◽  
pp. 28-31
Author(s):  
R.C Whittaker
Keyword(s):  
Seismic Data ◽  
Seismic Interpretation ◽  
Open File ◽  
West Greenland ◽  
Geological Interpretation ◽  
Early Tertiary ◽  
Field Season ◽  
File Series ◽  
Series Report ◽  
Tertiary Period

A seismic and geological interpretation of the area between latitudes 67°30'N and 73°N offshore West Greenland, was completed in 1995 and has been published as an Open File Series report (Whittaker, 1995). The area is characterised by extensive Early Tertiary basalts which are the seaward extension of the plateau basalts exposed in the Disko - Nuussuaq - Svartenhuk Halvø area onshore (Clarke & Pedersen, 1976). These basalts present special problems in the processing and interpretation of seismic data. The interpretation incorporates all the seismic data acquired prior to the 1995 field season, inc1uding those lines acquired during the first phase of exploration in the 1970s. Ties to two of the exploration wells drilled offshore southem West Greenland have led to a greater understanding of the timing and kinematics of teetonie events during the Tertiary period; such events are not recorded in the onshore area. The area is considered to have significant exploration potential and warrants additional studies to determine the thickness of the basalt formation in the area.

scholarly journals Seismic Interpretation and Inversion Leading to an Accurate Reservoir Characterization in a Carbonate Environment

2021 ◽  
Vol 2 (12) ◽  
pp. 1229-1230
Author(s):  
Yasir Bashir ◽  
Nordiana Mohd Muztaza ◽  
Nur Azwin Ismail ◽  
Ismail Ahmad Abir ◽  
Andy Anderson Bery ◽  
...  
Keyword(s):  
Seismic Data ◽  
Acoustic Impedance ◽  
Reservoir Characterization ◽  
Rock Physics ◽  
Seismic Inversion ◽  
Seismic Interpretation ◽  
And Inversion

Seismic data acquired in the field show the subsurface reflectors or horizon among the geological strata, while the seismic inversion converts this reflector information into the acoustic impedance section which shows the layer properties based on lithology. The research aims to predict the porosity to identify the reservoir which is in between the tight layer. So, the output of the seismic inversion is much more batter than the seismic as it is closer to reality such as geology. Seismic inversion is frequently used to determine rock physics properties, for example, acoustic impedance and porosity.

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