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Dive into the research topics where Abdolnaser Yousefzadeh is active.

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Featured researches published by Abdolnaser Yousefzadeh.


Seg Technical Program Expanded Abstracts | 2010

Solving Least Squares Kirchhoff Migration Using Multigrid Methods

Abdolnaser Yousefzadeh; John C. Bancroft

In order to attenuate the migration artifacts and increase the special resolution of the subsurface reflectivity, conventional migration may be replaced by the least squares migration (LSM). However, this is a costly procedure. To reduce the cost, the feasibility of using the multigrid methods in solving the linear system of prestack Kirchhoff LSM equation is investigated. This study showed that the conventional method of multigrid is not viable to solve Kirchhoff LSM equation for at least two reasons. The main reason is that the Hessian matrix is not a diagonally dominant matrix. Therefore, the conventional iterative solvers of the multigrid are not effective. The performance of Conjugate Gradient (CG) multigrid is discussed. It is shown that since CG does not have a smoothing property, it should not be considered as an effective multigrid iterative solver. Using the CG as an iterative solver for the multigrid may slightly reduces the number of iterations for the same rate of convergence in the CG itself. However, it does not reduce the total computational cost.


Archive | 2011

Migration velocity analysis of incomplete/irregular data using least squares Kirchhoff migration

Abdolnaser Yousefzadeh; John C. Bancroft; Gary F. Margrave


Spe Production & Operations | 2018

An Interpretation of Microseismic Spatial Anomalies, b -values, and Magnitude Analyses To Identify Activated Fracture Networks in Horn River Basin

Abdolnaser Yousefzadeh; Qi Li; Claudio Virues; Roberto Aguilera


SPE Unconventional Resources Conference | 2017

Comparison of PKN, KGD, Pseudo3D, and Diffusivity Models for Hydraulic Fracturing of the Horn River Basin Shale Gas Formations Using Microseismic Data

Abdolnaser Yousefzadeh; Qi Li; Claudio Virues; Roberto Aguilera


SPE Latin America and Caribbean Petroleum Engineering Conference | 2017

Evolution and Evaluation of SRV in Shale Gas Reservoirs: An Application in the Horn River Shale of Canada

E. Urban; Abdolnaser Yousefzadeh; Claudio Virues; Roberto Aguilera


SPE Hydraulic Fracturing Technology Conference | 2016

Identification of Activated Fracture Networks Using Microseismic Spatial Anomalies, b-values, and Magnitude Analyses in Horn River Basin

Abdolnaser Yousefzadeh; Qi Li; Claudio Virues; Roberto Aguilera


Seg Technical Program Expanded Abstracts | 2013

Time lapse imaging by separate and joint least squares prestack Kirchhoff migration

Abdolnaser Yousefzadeh; John C. Bancroft


Archive | 2013

A joint LSPSM/Inversion Algorithm For High Resolution Time Lapse Imaging

Abdolnaser Yousefzadeh; John C. Bancroft


Archive | 2013

LSPSM For Pre- and Poststack Time Lapse Studies

Abdolnaser Yousefzadeh; John C. Bancroft


Seg Technical Program Expanded Abstracts | 2012

Velocity evaluation using least squares prestack migration

Abdolnaser Yousefzadeh; John C. Bancroft

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Qi Li

University of Calgary

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E. Urban

University of Calgary

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