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Javad Khoshnavaz

Javad Khoshnavaz

PhD in Exploration Seismology

About

28
Publications
1,770
Reads
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105
Citations
Introduction
My dominant attitude in my research has been on developing and applying innovative algorithms in the existing upstream exploration tasks and to have a better understanding of the Earth structure. The main areas of my research have been on seismic imaging, seismic anisotropy, microseismic monitoring (hydraulic fracturing), and diffraction characterization. In the past 10 years, I have also been involved in lecturing at different universities in the area of geophysics, physics and engineering.

Publications

Publications (28)
Article
Diffractions carry out important information about subsurface features. These features include small scale objects, fracture zones and faults. There have been several robust pre‐ and post‐stack diffraction imaging workflows in the literature to attribute diffraction locations and properties. Most of the traditional workflows are not fully capable o...
Article
Normal-moveout correction is an inevitable part of routine seismic data processing and imaging. Normal-moveout correction suffers from an undesirable phenomenon called normal-moveout stretching, which is more pronounced in larger emerging angles. Frequency distortions caused by normal-moveout stretching for isotropic media has fully been studied in...
Article
Seismic reconstruction of missing traces is an extremely important subject in seismic data processing. It includes both interpolation and extrapolation of sparsely recorded data. Extrapolation is often performed in the absence of near‐offset seismic data recorded through marine acquisition. Several reconstruction methods have been designed to circu...
Article
Calculating an accurate seismic velocity model serves an important role in many seismic imaging techniques. The process of velocity model building is often time-consuming, specifically for anisotropic areas, where more than a single parameter is involved in the process. In the past few years, more time-efficient approaches have been considered to e...
Article
Building an accurate velocity model plays a vital role in routine seismic imaging workflows. Normal-moveout-based seismic velocity analysis is a popular method to make the velocity models. However, traditional velocity analysis methodologies are not generally capable of handling amplitude variations across moveout curves, specifically polarity reve...
Article
Obtaining accurate velocity models plays a crucial role in many routine seismic imaging algorithms. Seismic velocity models are normally made through seismic velocity analysis workflows. The routine workflows are not capable of dealing with polarity variations across moveout curves. We address this limitation by proposing a straight forward and rob...
Presentation
A precise seismic velocity model is required for many seismic imaging techniques. This model is usually derived from seismic data sets. Errors in velocity spectrum caused by ignoring anisotropy have direct negative impacts on final image accuracy. On the other hand, estimating velocity spectrum by considering anisotropy will be more time consuming...
Article
Full-text available
Monitoring of passive seismic sources generated by mining activities and hydraulic fracturing has an important role in hazard analysis and in development of unconventional reservoirs. Surface arrays are vastly used in such monitoring scenarios with the advantage of wider spatial monitoring aperture, thus monitoring larger volumes over downhole arra...
Article
Full-text available
Spatial aliasing is an unwanted side effect that produces artifacts during seismic data processing, imaging and interpolation. It is often caused by insufficient spatial sampling of seismic data and often happens in CMP (Common Mid-Point) gather. To tackle this artifact, several techniques have been developed in time-space domain as well as frequen...
Article
Full-text available
Human body is a miracle machine created by the creator. It’s happens different types of Biological, chemical and physical activities inside and outside. In this research trying to describe functions of electrons on human body, adverse effect of it on human body, free electron and Free radical functions, Grounding of human body, neutralize of static...
Article
Oriented time-domain imaging can be orders of magnitude faster than the routine techniques, which rely on velocity analysis. The term "oriented" refers to those techniques that use the information carried by local slopes. Time-domain dip moveout (DMO) correction, which has often been ignored by the seismic imaging community, has been coming back to...
Article
A common acquisition scenario in microseismic monitoring is the deployment of large areal receiver arrays at or near the surface. This recording geometry has the advantage of providing coverage of the source's focal hemisphere as well as characterization of the arrival time moveout curve; however, the accuracy of many location techniques applied to...
Article
Diffractions carry valuable information about local discontinuities and small scale objects in the subsurface. They are still not commonly used in the process of geological interpretation. Many diffraction imaging techniques have been developed and applied for isotropic media while relatively few techniques have been developed for anisotropic media...
Article
The primary objective of seismic exploration in a hard rock environment is the detection of heterogeneities such as fracture zones, small-scale geobodies, intrusions, and steeply dipping structures that are often associated with mineral deposits. Prospecting in such environments using seismic-reflection methods is more challenging than in sedimenta...
Article
Full-text available
Seismic imaging techniques often require an input velocity model. Velocity analysis is one of the most critical stages in seismic data processing. Standard ways to find the velocity model from seismic data in the time domain are constant velocity stack and semblance velocity analysis that may be time consuming and labor intensive. Oriented/velocity...
Article
Agood seismic velocity model is required for many routine seismic imaging techniques. Velocity model building from seismic data is often labor intensive and time consuming. The process becomes more complicated by taking nonhyperbolic traveltime estimations into account. An alternative to the conventional time-domain imaging algorithms is to use tec...
Conference Paper
Diffractions carry valuable information about local discontinuities and small scale objects in the subsurface. They are still not commonly used in the process of geological interpretation. Many diffraction imaging techniques have been developed and applied for isotropic media while relatively few techniques have been developed for anisotropic media...
Article
SUMMARY There are two types of passive seismic monitoring: downhole and surface monitoring. In this paper, we introduce a new surface monitoring technique that does not require trigger time and any seismic velocity information prior to imaging. Therefore, this technique can be considered as a velocity independent monitoring technique. We have calcu...
Article
SUMMARY Velocity analysis is one of the most critical stages in seismic data processing and the velocity errors influence the accuracy of the imaging. The conventional workflows, to obtain the migration velocity model, are generally labour intensive and time consuming. An experienced processor is needed to pick the velocities in the velocity spectr...
Conference Paper
Passive seismic events are generally made by fault displacement, drilling, and hydraulic fracturing during high-pressure fluid injection into boreholes. There are two general configurations of seismic receiver arrays for passive seismic event monitoring: surface and down-hole. Surface arrays provide a larger aperture and hence greater coverage of t...
Article
). ( ) ( ( ) ) √( ) SUMMARY Most of the migration techniques require an input velocity model. Velocity analysis is one of the most critical stages in seismic data processing. Standard ways to find the velocity model are constant velocity stack and Semblance velocity analysis, which can be time consuming and labour intensive. In this work, we introd...
Article
Spatial aliasing happens in some seismic data acquisition and affects severely the performance of multichannel data processing and interpretation. Conventional methods (e.g. antialias filtering) remove high-frequency information from data in hand and distort the signals. The procedure we present here produces a unaliased estimation of all frequency...

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