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.

scholarly journals Effect of Materials Content on Dimensional Stability, Nano Roughness and Interfaced Morphology for Virgin or Recycled Polypropylene Based Wood Composites

2021 ◽  
Author(s):  
Shamsul Haq
Keyword(s):  
Dimensional Stability ◽  
Coupling Agent ◽  
Processing Technique ◽  
Performance Ratio ◽  
Wood Composites ◽  
Polypropylene Composites ◽  
Price Performance ◽  
Environmental Footprints ◽  
Higher Dimensional ◽  
Recycled Plastics

The compositions of mango wood-polypropylene composites (WPCs) are formulated, with different compositions of virgin polypropylene (PP) or recycled PP, mango wood waste and a coupling agent. The compositions are fabricated via melt extrusion compounding pursued by injection hot molding. The tests of the prepared compositions are carried out for, water absorption, thickness swelling, surface properties at a nano-scale and interfaced morphology. Comparative study of WPCs composition has done on respective properties. All processing variable conditions are constant for different compositions. The recycled PP based wood composites with or without the coupling agent possessed superior properties in comparison to virgin PP based composites. FESEM images show that coupled composite is having the better bonding strength and smoothness along with a higher dimensional stability in comparison to none coupled composite. Future endeavor should be focused on optimizing the composition of reinforcement wood and recycled plastics matrix according to intended application. The quality of WPCs can also be improved with the co-ordination of latest development in technology and processing technique relevant to them. WPCs study supports “turning waste into something useful”. This provides the mileage in price performance ratio and also the product’s environmental footprints to be adjusted to suit the products application.

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.

Multithreaded Programming of Reconfigurable Embedded Systems

2011 ◽  
pp. 31-54
Author(s):  
Jason Agron ◽  
David Andrews ◽  
Markus Happe ◽  
Enno Lübbers ◽  
Marco Platzner
Keyword(s):  
Development Time ◽  
Programming Model ◽  
General Purpose ◽  
System Level ◽  
Performance Ratio ◽  
Multithreaded Programming ◽  
Price Performance ◽  
Flexible Hardware ◽  
Custom Hardware ◽  
Application Requirements

Embedded and Real-Time (ERTS) systems have continued to expand at a vigorous rate. Designers of ERTS systems are continually challenged to provide new capabilities that can meet the expanding requirements and increased computational needs of each new proposed application, but at a decreasing price/performance ratio. Conventional solutions using general purpose processors or custom ASICs are less and less able to satisfy the contradictory requirements in performance, flexibility, power, development time, and cost. This chapter introduces the concept of generating semi-custom platforms driven from a traditional multithreaded programming model. This approach offers the advantage of achieving productivity levels close to those associated with software by using an established programming model but with a performance level close to custom hardware through the use of a flexible hardware platform capable of adapting to specialized application requirements. We discuss the underlying concepts, requirements and advantages of multithreading in the context of reconfigurable hardware, and present two approaches which provide multithreading support to hardware and software components at the operating system level.

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.

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 LINUX PC CLUSTER FOR LATTICE QCD WITH EXACT CHIRAL SYMMETRY

2003 ◽  
Vol 14 (06) ◽  
pp. 723-746 ◽  
Author(s):  
TING-WAI CHIU ◽  
TUNG-HAN HSIEH ◽  
CHAO-HSI HUANG ◽  
TSUNG-REN HUANG
Keyword(s):  
Lattice Qcd ◽  
Chiral Symmetry ◽  
Hard Disk ◽  
Performance Ratio ◽  
Double Precision ◽  
Computational System ◽  
Pc Cluster ◽  
Price Performance ◽  
Computationally Intensive ◽  
Better Than

A computational system for lattice QCD with overlap Dirac quarks is described. The platform is a home-made Linux PC cluster, built with off-the-shelf components. At present the system constitutes of 64 nodes, with each node consisting of one Pentium 4 processor (1.6/2.0/2.5 GHz), one Gbyte of PC800/1066 RDRAM, one 40/80/120 Gbyte hard disk, and a network card. The computationally intensive parts of our program are written in SSE2 codes. The speed of our system is estimated to be 70 Gflops, and its price/performance ratio is better than $1.0/Mflops for 64-bit (double precision) computations in quenched QCD. We discuss how to optimize its hardware and software for computing propagators of overlap Dirac quarks.

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