Mrinal Sen is a specialist on seismic wave propagation including anisotropy, Geophysical inverse problems, and methods for constructing synthetic seismograms in heterogeneous media. His areas of research include classical whole earth seismology, applied seismology and inverse theory. Over the years, he worked on several geophysical parameter estimation problems. He and his colleagues were able to demonstrate that global optimization methods such as simulated annealing (SA) and genetic algorithms (GA) can be used effectively for several geophysical applications such as seismic waveform inversion, gravity interpretations, and seismic migration velocity analysis. He also showed how one could apply Gibbs' sampling and the Metropolis rule to characterize uncertainties and the posterior probability density function (PPD) in model space. He has extended seismic plane wave analysis methods to anisotropic media and developed techniques for estimating the parameters that determine the degree of anisotropy. His most recent accomplishments in exploration seismology include developing novel methods for characterizing reservoirs using seismic and well log data, estimating P- and S-wave velocity models for sediments containing gas hydrates from seismic reflection data, and, improving seismic imaging and velocity estimation methods in structurally complex areas. In whole earth seismology he has estimated the anisotropy in the D" region of the earth's deep interior. He is continuing to actively pursue research problems that require development of new analytic and numerical methods in both exploration and whole earth seismology. For example using seismic reflection data particularly from zones of gas hydrates, he is attempting to find high resolution compressional and shear wave velocities and relate these to gas and hydrate concentration levels and their distribution. For 3D exploration reflection seismic data he is attempting through model based inversion methods to relate these data to reservoir properties and their changes during production via seismic time lapse data. For global seismic data he is working on event discrimination methods based on inverse modeling.

Areas of Expertise

Seismic wave propagation including anisotropy, geophysical inverse problems, earthquakes and earth structure, applied seismology, petroleum exploration including 4D seismology


UTIG Directors Circle of Excellence - Jackson School of Geosciences, UT-Austin (2010)

Joseph C. Walter Jr. Award for Research Excellence - Jackson School of Geosciences, UT-Austin (2007)

John A. and Katherine G. Jackson Chair in Applied Seismology - Jackson School of Geosciences, UT-Austin (2007)

Outstanding Student Paper Award - AGU Fall meeting, San Francisco (2004)

Best Paper Award (presented by a student) - SEG2004 in Denver (2004)

Best Paper Award (best paper on AVO inversion) - SEG/EAEG Summer Research Workshop (1992)

Recipient of J. Watumul Foundation Award for the most outstanding student in Geology and Geophysics - University of Hawaii (1986)

Recipient - SEG Scholarship (1986 - 1987)

Recipient - SEG Scholarship (1985 - 1986)

Recipient - SEG Scholarship (1984 - 1985)

Recipient of ISM silver medal for ranking first in first class in BSc and MSc - Indian School of Mines

Co-chair, Technical Program Committee, SEG representative, Society of Petroleum Geophysicists' annual meeting, Hyderabad India (2004)

Visiting Professor, Section Applied Geophysics, Delft University of Technology, The Netherlands (2001)

Member, Technical Program Committee, Society of Exploration Geophysicists' annual meeting, San Antonio, Texas (2001)

Invited Panel Member, Global inversion of Geophysical Data, DOE workshop, San Jose, California (1999)

Invited Participant (unclassified), "Detection of Underground Facilities", DARPA Geophysics seminar (1999)

Member, External Review Board , Marine Geosciences Division Basic and Applied Research programs, Office of Naval Research (1999)

Invited Participant, How uncertainty is related to ocean science models?", National Research Council (NRC) planning workshop, Washington D.C. (1999)

Consultant, Upstream Strategic Research Group, MOBIL Oil Company, Dallas, TX (1998)

Consultant, Rock Physics / Seismic Attributes Group, AMOCO Research Center, Tulsa, OK (1998)

Associate Editor, Computational Seismology and Geodynamics, American Geophysical Union (1997)

Invited Participant, 2 week workshop on "Inverse Problems at the Institute of Mathematics and Its applications.", University of Minnesota (1995)

Visiting Scientist, NRL-SSC, Bay St. Louis, MS (1993)

Research Seismologist, Hawaii Institute of Geophysics (1987)

Geophysical Intern, SOHIO Petroleum Company, Dallas, TX (1985)

Teaching , Inverse Theory, to be entered

Teaching, Advanced Theoretical Seismology, to be entered

Teaching, Solid Earth Geophysics, to be entered

Teaching, Linear systems and inverse methods, to be entered

Teaching, Seminar courses on seismic migration and inversion, to be entered

Teaching, Asymptotic methods in seismic wave propagation, to be entered

Member, European Academy of Sciences

Member, American Geophysical Union

Member, European Association of Geoscientists and Engineers

Member, Society of Exploration Geophysicists

Member, Society of Industrial and Applied Mathematics

Member, International Committee, Society of Exploration Geophysicists

Member, Computer Application Committee, Society of Exploration Geophysicists

Ph.D. Advisor, L.N. Frazier, University of Hawaii

MRINAL K. SEN
SUMMARY OF CURRENT STUDENT ACTIVITES

Supervisor (Current)

Zeyu Zhao PhD Student, UT-DGS, Supervisor
Imaging of wide-angle seismic data

Kumar Das
PhD Student, UT-DGS, Supervisor
Joint Inversion of Seismic and Gravity data for determination of the structure of Shiva Crater, India

Yang Xue
PhD Student, UT-DGS, Supervisor
Bayesian inversion of land multi-component data

Mohammed Alhussain
PhD Student, UT-DGS, Supervisor
Frequency dependent anisotropy

Yi Tao
PhD Student, UT-DGS
Seismic interferometry and inversion

Travis Richards
MS Student, UT-DGS
Prestack inversion for characterization of tight gas sand (Bossier) reservoir

Co-Supervisor (Current)

Jiao Xue
PhD (Visiting Student), China University of Geosciences
Anisotropy parameter estimation and inversion for reservoir characterization

Yawen He
PhD Student, UT-DGS
to be determined

Robert Brown
MS Student, UT-DGS
Seismic Sensitivity to variation in the Marcellus Shale

Committee Member (Current)

Vladimir Bashkardin
PhD (Cadidate), UT-DGS
Slope tomographic method in an Eulerian framework for seismic macro-velocity estimation

Robert Brown
MS Student, UT-DGS
Seismic Sensitivity to variation in the Marcellus Shale

Terence Campbell
PhD (Candidate), UT-DGS
Corrections for distortion polarization in reflected shearwave for isotrapic and anisotropic medium

Jamin Stevens Greenbaum
PhD Student
To be determined

Masoumeh Kordi
PhD (Cadidate), UT-DGS
Characterization of reservoir heterogeneity at the Cranfield Oil Field, in the context of CO2 sequestration and enhanced oil recovery

Erick Leuro
PhD Student, UT-DGS
Masters Research (Degree from 2004):
GIS compilation of geologic, geophysical, and remote sensing data from St. Elias Mountains, southern Alaska

Isaac Smith
PhD Student, UT-DGS
Spiral Troughs of Mars: Formation, Evolution and Links to Climate from Subsurface Mapping and Process Modeling

Sandy Suhardja
PhD (Candidate), UT-DGS
Tomographic Imaging of Passive Earthquake Data

Yang Wang
PhD Student, UT-DGS
Upper Mantle Seismic Structure


MRINAL K. SEN
SUMMARY OF PAST STUDENT ACTIVITES

Supervisor (Past)

Corey Joy
MS Summer 2011, UT-DGS
Effective medium modeling of carbon sequestered reservoirs

Son Phan
MS Spring 2011, UT-DGS
Uncertainty in reservoir parameter estimation

Ma Jitao
PhD Spring 2009, China University of Petroleum
Multiple attenuation in plane wave domain

Jonas De Basabe
PhD Spring 2009, Computational and Applied Math-UT
Numerical Simulation of Elastic Wave Propagation

Samik Sil
PhD Spring 2009, UT-DGS
Two-way travel time analysis for seismic reservoir characterization

Tao Liu
Exchange PhD Student 2009, Beijing University, Dept of Geophysics
Hybrid finite difference-finite element of seismic wave propagation

Daniel Smith
MS Fall 2008, UT-DGS
Seismic Trace Regularization and Datuming

Abdul Aziz Al-Aslani
MS Summer 2008, UT-DGS
Post-stack inversion for porosity estimation of carbonate reservoirs

Tiancong Hong
PhD Summer 2008, UT-DGS
MCMC Algorithm, Integrated 4D Seismic Reservoir Characterization and Uncertainty Analysis in a Bayesian Framework

Sanjay Sood
MS Fall 2007, UT-DGS
Estimation of Q from seismic refractions data

Reeshidev Bansal
PhD Spring 2007, UT-DGS
Seismic Characterization of Naturally Fractured Rerservoirs

Gregory Young
MS Spring 2007, UT-DGS
Effective Porosity Estimation from 3D Seismic: Marco Polo Field

Dhananjay Kumar
PhD Spring 2005, UT-DGS
Analysis of multicomponent seismic data from the Hydrate Ridge, offshore Oregon


Co-Supervisor (Past)

Setiyono Kriyanti
MS Fall 1996 (May), UT-DGS
Comparison of Multiple Elimination Methods

Raghu Chunduru
PhD Spring 1996 (May), UT-DGS?
Hybrid linear/nonlinear inversion of geophysical data

Eddy Luhurbudi
MA Spring 1997 (May), UT-DGS
Traveltime calculation in 3-D

Faruq Akbar
PhD Summer 1997 (Aug), UT-DGS
Three-dimensional prestack plane-wave Kirchhoff depth migration in laterally varying media

Carlos Calderon-Macias
PhD Summer 1997 (Aug), UT-DGS
Feedforward NN, Hopfield network and mean field annealing in seismic waveform inversion

Ganyuan Xia
PhD Summer 1997 (Aug), UT-DGS
Prestack Migration and Inversion

Mehmet Tanis
PhD Fall 1989 (Dec), UT-DGS
A Comparison of Migration Methods in Laterally Varying Media

Faqi Liu
PhD Summer 1999 (Aug), UT-DGS
Free surface multiple elimination operators and their applications

Saleh Mohammad Al-saleh
MS Summer 2001 (Aug), UT-DGS
Processing of ocean bottom cable data

Abdul-Aziz Saleh Alaslani
PhD Fall 2001 (Dec), UT-DGS
Developing, testing, and evaluating wave equation based multiple removal methods for marine seismic data

Anubrati Mukherjee
PhD Spring 2002 (May), UT-DGS
Seismic Processing in transversely isotropic media: A tau-p approach

Gijs Meek
Exchange MS Student 2003, Mining Engr and Applied Geophysics, Delft University of Technology, Netherlands
Integrated subsurface modelling

Chengshu Wang
PhD Summer 2003 (Aug), UT-DGS
Velocity estimation of gas hydrate

Hedi Poot
Exchange PhD Student 2003, Applied Geophysics, Delft University of Technology, Netherlands
imaging methods for acoustical data

Armando Sena
PhD Fall 2004 (Dec), UT-DGS
Imaging and analysis of GPR data

Paul Zwartjes
Exchange PhD Student 2004, Acoustic Physics, DelftUniversity of Technology,Netherlands
Seismic Data Regularization

Joost Van der Noot
Exchange MS Student 2005, Applied Geophysics, Delft University of Technology, Netherlands stress induced anisotropy

Chandan Kumar
PhD Fall 2006, UT-DGS
Stress estimation from fault plane reflection coefficient

Audrey Neau
Exchange PhD Spring 2007, L'Universite de Pau, France
Bayesian Inversion

Adam Allan
BS Fall 2009 (Dec)
Honors Program, DGS-UT (Undergraduate)
Regularization methods


Committee Member (Past)

William Burnett
MS Spring 2007 (May), UT-DGS
PhD Spring 2011 (May), UT-DGS
A General Transform for Reversible Seismic Data Processing by Non-stationary Filtering.

Alireza Shahin
PhD Spring 2011 (May), UT-DGS
Time Lapse Seismic Response to Production

Ankesh Anupam
MS Engineering Summer 2010 (Aug), UT-DGS
Hierarchical modeling of fractures for naturally fractured reservoirs

Bryce Wagner
PhD Spring 2010 (May), UT-DGS
An analysis of salt welding

Fang Ye
MS Spring 2010 (May), UT-DGS
Fracture Estimation in the Bakken Shale from 3C-3D Data

Na Shan
MS Fall 2010 (Dec), UT-DGS
Isotropic and Anisotropic Seismic Characterization of Woodford Shale

Chunlei Chu
PhD Fall 2009 (Dec), UT-DGS
Seismic modeling and imaging with the fourier method [electronic resource] : numerical analyses and parallel implementation strategies

Enrique Rosero Ramirez
PhD Fall 2009 (Dec), UT-DGS
Evaluating enhanced hydrological representations in Noah LSM over transition zones [electronic resource] : an ensemble-based approach to model diagnostic

Chaoshun Hu
PhD Fall 2008 (Dec), UT-DGS
Stochastic tomography and Gaussian beam depth migration

Sasha Peter Carter
PhD Summer 2008 (Aug), UT-DGS
Evolving subglacial water systems in East Antarctica from airborne radar soundin

Ali Mansour Aljadher
MS Summer 2008 (Aug), UT-DGS
Imaging of R3 profile of Chicxulub offshore seismic data using prestack split-stip Fourier migration in the plane wave domain

Theresa Marie Diehl
PhD Summer 2008 (Aug), UT-DGS
Gravity analyses for the crustal structure and subglacial geology of West Antarctica, particularly beneath Thwaites Glacier

Komars Eskandaridalvand
PhD Spring 2008 (May), UT Dept of Petroleum andGeosystems Engineering
Petroleum Engineering

Irina Filina
PhD Fall 2007 (Dec), UT-DGS
Geophysical investigations of subglacial lakes Vostok and Concordia, East Antarctica

Edgar Pinzon
MS Fall 2007 (Dec), UT -DGS & Bureau of Economic Geology
Fracture pattern prediction using geomechanical models incorporating diagenesis, with comparison to outcrop data (Cambrian Eriboll group sandstones, northwestern Scotland) and core observations (Tertiary Mirador Formation sandstones, Llanos foothills Colo

Hao Xun
MS Summer 2007 (Aug), UT-DGS
A 3-D seismic investigation of the distribution of gas hydrate and free gas and their relationship to the structure and stratigraphy of Hydrate Ridge


Samrajit Chakraborty
MS Spring 2007 (May), UT-DGS
An Int. Geologic Model of the Valhall Oil Field for Simulation of Fluid Flow & Seismic Response

Jason Gumble
PhD Fall 2006 (Dec), UT-DGS
Anisotropic analysis of 3C data for OBC & comparison to 9C

Marc Buursink
Exchange Phd Student 2005/6, Boise State University, Geophysics, Boise State University
Fresnel volume GPR tomography to characterize porosity in a heterogeneous reservoir.

Teresa Gomez
MS Spring 2005 (May), UT-DGS
Sensitivity of P-P, SH-SH and P-SV seismic reflectivity to partial gas saturation

Jason Stine
MS Spring 2004 (May), UT-DGS
Sensitivity of AVO reflectivity to fluid properties in pourous media

Imtiaz Ahmed
PhD Fall 2003 (Dec), UT-DGS
Seismic Imaging of wide angle seismic data

Matthew Morris
MS Fall 2003 (Dec), UT-DGS
Analysis on P-P and P-SV AVO respons

Omar Varela Londono
PhD Summer 2003 (Aug), UT-Dept of Petroleum Engineering
Background Velocity Estimation in Laterally Varying Media

Junru Jiao
PhD Spring 2001 (May), UT-DGS
Migration velocity estimation in 2D and 3D

Jean-Paul Van Gestel
PhD Spring 2000 (May), UT-DGS
Structure and tectonics of the Puerto Rico-Virgin Islands platform and multi-confirguration ground penetrating radar data

Viramaditya Sen
PhD Fall 1998 (Dec), UT-DGS
Estimation of seismic velocities in the Barabso accretionary prism using iterative prestack depth migration on 3-D multichannel and ocean-bottom seismometer data

Mahesh Rajagopalan
MS Engineering (May), UT-Dept of Electrical & Computer Engineering
An image processing approach to migration for point diffractor

Mehmet Tanis
PhD Fall 1998 (Dec), UT-DGS
A comparison of migration methods in laterally varying media

Fernando Campozana
PhD Spring 1997 (May), UT-Dept of Petroleum Engineering
The Use of Production Data in Reservoir Description

Duk Kee Lee
PhD Spring 1996 (May), UT-DGS
Imaging study of the upper mantle seismic velocity structure beneath theRocky Mountain fron

Michael Jervis
PhD Summer 1993 (Aug), UT-DGS
Optimization methods for 2-D pre-stack migration velocity estimation

Eduardo Faria
PhD Summer 1993 (Aug), UT-DGS
Modeling, migration and focusing analysis in transversely isotropic media

Livia Squires
PhD Spring 1993 (May), UT-DGS
Reducing Artifacts inTomographic Velocity Reconstruction

Warren Wood
PhD Spring 1993 (May), UT-DGS
Least Squares Inversion of Field Seismic Data for an Elastic 1-D Earth

James Lyons
MS Spring 1975 (May), UT-DGS
Current PhD student

POST-DOCTORAL RESEARCHERS AND VISITING SCIENTISTS SPONSORED

1. Dr. Rui Zhang 1/11-
2. Dr. Jonas DeBasabe 04/09-07/10
3. Dr. Deng Zhiwen 03/10-9/11
4. Dr. Ranjana Ghosh 04/10-
5. Dr. Ma Jitao 09/09-03/10
6. Puneet Saraswat, undergrad from ISM Dhanbad July 2010
7. Prof. Utpal Dutta, University of Alaska Summer 2007,2008,2009,2010
8. Prof. Yang Liu, China University of Petroleum 09/08-08/09
9. Dr. Adrian Ciucivara 01/08-05/09
10. T. Vikranth Babu, undergrad from IIT Madras 6/1/09-07/25/09
11. Dr. Ravi Srivastava 03/08-05/09
12. Dr. Armando Sena 10/07-06/09
13. Dr. Jin Long, Post-doctoral Fellow 05/06-09/08
14. Dr. A. Pal, Post-doctoral Fellow 05/06-04/08
15. Dr. Abhijit Gangopadhyay, Post-doctoral Fellow 01/06-10/07
16. Dr. Nimisha Vedanti 5/07-4/08
17. S. Rajput, Post-doctoral Fellow 12/06-02/07
18. Joost van der Noot, Graduate student Delft University 01/06-04/06
19. S. Rajput, Graduate student, NGRI, India 10/06-11/06
20. Dr. Utpal Dutta, University of Alaska, Fairbanks 07/05
21. Dr, Murthi Guddati, Assistant Professor, University of North Carolina 06/01/04-07/15/04
22. Dr. Y. Xia, Post-doctoral fellow 01/01/02-12/31/03
23. Dr. Qiaozhen Mu, Post-doctoral fellow 01/01/02-12/31/03
24. Dr. Wulfgang Bangerth 09/01/03-04
25. Dr. Indrajit G. Roy, Post-doctoral fellow 11/01/00-08/31/03
26. Dr. Zhan Wu, Post-doctoral Fellow 03-04
27. Dr. Ranjit K. Shaw, Post-doctoral fellow 06/01/02-05/31/03
28. Dr. Lopamudra Roy, Post-doctoral fellow 06/01/02-05/31/03
29. Prof. Robert Nowack, Purdue University, Visiting scientist 02/01/01-03/31/01
30. Prof. Milton Porsani, Visiting scientist 01/01 - 02/28/01
31. Dr. J. Pestana, Postdoctoral Fellow 09/98-08/99
32. Dr. Faruq Akbar, Postdoctoral Fellow 07/97-09/98
33. Dr. Roustam Seif, Research Fellow, Programmer 09/98-04
34. Dr. Jay Pulliam, Postdoctoral Fellow 01/95-08/97
35. Dr. R. Phillip Bording, Postdoctoral Fellow 08/95-07/97


Graduate Students

Kumar S Das, M.S., expected 2012

Yi Tao, Ph.D., expected 2013

Yang Xue, Ph.D., expected 2014
seismic inversion for reservoir characterization and monitoring

Mohammed A Alhussain, Ph.D., expected 2014

Zeyu Zhao, Ph.D., expected 2016

Yawen He, Ph.D., expected 2016

Corey Joy, M.S., 2011
Effective medium modeling of carbon sequestered reservoirs

Son Phan, M.S., 2011
Uncertainty in reservoir parameter estimation

Ma Jitao, Ph.D., 2009, China University of Petroleum
Multiple attenuation in plane wave domain

Jonas De Basabe, Ph.D., 2009, University of Texas at Austin, Computational and Applied Mathematics
Numerical Simulation of Elastic Wave Propagation

Samik Sil, Ph.D., 2009
Two-way travel time analysis for seismic reservoir characterization

Tao Liu, Ph.D., 2009, Beijing University, Department of Geophysics
Hybrid finite difference-finite element of seismic wave propagation

Daniel Smith, M.S., 2008
Seismic Trace Regularization and Datuming

Abdul Azis Al-Aslani, M.S., 2008
Post-stack inversion for porosity estimation of carbonate reservoirs

Tiancong Hong, Ph.D., 2008
MCMC Algorithm, Integrated 4D Seismic Reservoir Characterization and Uncertainty Analysis in a Bayesian Framework

Sanjay Sood, M.S., 2007
Estimation of Q from seismic refractions data

Reeshidev Bansal, Ph.D., 2007
Seismic Characterization of Naturally Fractured Rerservoirs

Gregory Young, M.S., 2007
Effective Porosity Estimation from 3D Seismic: Marco Polo Field

Dhananjay Kumar, Ph.D., 2005
Analysis of multicomponent seismic data from the Hydrate Ridge, offshore Oregon

Jiao Xue
Visiting PhD Student from the Institute of Geophysics, China University of Geosciences. Ent. Fall ‘11, Visiting Scholar. Anisotropy parameter estimation and inversion for reservoir characterization

Travis Richards

Robert Brown

Manasij Santra


"Seismic inversion and Uncertainty Quantification for reservoir characterization", Cairn Energy, Gurgaon, India, December 9, 2011. (2011)

"Challenges in computational seismology: 4th paradigm of subsurface imaging", National Geophysical Research Institute Golden Jubilee, Hyderabad, India, October 12, 2011. (2011)

"Some practical aspects of numerical simulation of seismic wave propagation", Exxon-Mobil Research Center, Houston, TX, August 2011. (2011)

"Some practical aspects of numerical simulation of seismic wave propagation", BP Research Center, Houston, TX, August 2011. (2011)

"Meta-heuristics for uncertainty characterization in geophysical inversion", key-note speech in the session on soft-computing applications in geophysics,, AOGS 2011 conference, Taipei, Taiwan, August 2011. (2011)

"Computational methods for forward and inverse problems of seismology", Indian School of Mines, Dhanbad, India, August 2011. (2011)

"Seismic methods for subsurface characterization", Central institute of mining and fuel research, Dhanbad, India, August 2011. (2011)

“Computational methods for forward and inverse problems of seismology”, Indian Institute of Science Education and Research, Kolkata, India, August 2011 (2011)

“Seismic Inversion: computational challenges”, National Geophysical Research Institute, India, July (2011)

“Critical issues related to numerical simulation of wave propagation”, SEG summer research workshop, Quebec City, Canada, June (2011)

“On some practical aspects of numerical simulation of seismic wave propagation”, KAUST-IAMCS workshop on Multi-scale modeling, Advanced discretization techniques, and simulation of wave propagation, King Abdullah University of Science and Technology, May (2011)

“Full waveform inversion for reservoir characterization”, BGP Chinese National Oil Company, Beijing, China, March (2011)

“Wave propagation in fractured porous media”, China University of Petroleum, Beijing, China, March (2011)

“Use of priors and hyper-priors in seismic inversion”, workshop on seismic exploration: current status and future directions, King Abdullah University of Science and Technology, Jan (2010)

“Inverse methods, geostatistics and neural networks for seismic reservoir characterization”, SPG Dehradun, India, Dec (2010)

“Seismic inversion for reservoir characterization: some critical issues”, Department of Geophysics, Stanford University, California, May (2010)

“Use of prior and hyper-prior in seismic inversion for reservoir characterization”, Key-note speech, SPG Conference, Hyderabad, India, February (2010)

"Role of scientific societies in promoting science and technology", Key-note speech, SPG Conference, Hyderabad, India, February (2010)

"Constrained pre-stack waveform inversion", Western-Geco/Schlumberger Reservoir Services, Houston, Texas (2005)

"Free Gas and Gas Hydrate Saturation from multi-component seismic data from offshore Oregon", Rice University, Houston, Texas (2005)

"Free Gas and Gas Hydrate Saturation from multi-component seismic data from offshore Oregon", Edger Forum meeting, Austin, TX (2005)

"Seismic Inversion: State of the art", SPG Kolkata chapter, Kolkata, India (2005)

"Seismic modeling of fractured reservoirs", SIAM annual meeting, Portland, OR (2004)

"Seismic waveform inversion and characterization of gas hydrates offshore Oregon", Department of Geological Sciences, Indiana University, Bloomington, Indiana (2004)

"Seismic imaging in heterogeneous, anisotropic media", Department of Geological Sciences, Indiana University, Bloomington, Indiana (2004)

"Seismic Inversion for reservoir characterization", Department of Earth Sciences, Memorial University of Newfoundland, Newfoundland (2004)

"Analysis and interpretation of OBS and streamer data from Hydrate Ridge, offshore Oregon", EDGER forum meeting, University of Texas at Austin, Austin, Texas (2004)

"Seismic waveform inversion: Current status and future directions", Keynote address, Society of Petroleum Geophysicists (SPG) conference, Hyderabad, India (2004)

"Seismic Modeling of fractured reservoirs", Industrial Associates meeting, Institute of computational and engineering sciences, The University of Texas at Austin, Austin, Texas (2003)

"Gas Hydrates: their resource potential and geophysical characterization", Institute for Geophysics, UNAM, Mexico City, Mexico (2003)

"Pre-stack Seismic waveform inversion: current status and future directions", Mexican Institute of Petroleum (IMP), Mexico City, Mexico (2003)

"Gas Hydrates: their resource potential and geophysical characterization", Mexican Institute of Petroleum (IMP), Mexico City, Mexico (2003)

"Synthetic Seismograms in layered fractured media", FRACCITY annual meeting, Jackson Hole, Wyoming (2003)

"Pre-stack inversion and anisotropic velocity analysis", Jason Geosystems, Rotterdam, The Netherlands (2003)

"Migration velocity estimation by non-linear optimization", Society of Industrial; and Applied Math conference on mathematical and computational issues in geoscience, (2003)

"Estimation of Vp and Vs of shallow sediments offshore Oregon: Implication towards the distribution of gas hydrates", Petrotech Conference, New Delhi (2003)

"Gas Hydrates: their resource potential and geophysical characterization", Prof. Jagdeo Singh Memorial Lecture at Indian School of Mines, Dhanbad (2003)

"Gas Hydrates: their resource potential and geophysical characterization", Society of Petroleum Geophysicists, Kolkata chapter, (2003)

Geophysical Inversion - An overview, Schlumberger Oilfield Services, Houston, Texas (2002)

Rock property estimation from reflection seismic data, Shell Oil Company, Houston, Texas (2002)

Techniques for pre-stack waveform inversion, , R&D Division, Western Geco, Houston, Texas (2002)

Waveform inversion for reservoir characterization, BP, Houston, Texas (2002)

Pre-stack inversion with adaptive regularization, Society of Petroleum Geophysicists meeting, Mumbai, India (2002)

Seismic Processing in transversely isotropic media: the tau-p approach, Section Mining Engg and Applied Geophysics, Delft University of Technology, The Netherlands (2001)

Pre-stack inversion: Current status and future directions, SBGF meeting, Bahia, Salvador (2001)

Pre-stack inversion: Isotropy and Transverse Isotropy, EDGER Forum, University of Texas at Austin, Austin, Texas (2001)

Air-borne GPR for the detection of underground facilities, International workshop on GPR, TNO, The Netherlands (2001)

Integrated reservoir characterization, Western Geophysical , Houston, Texas (2000)

Integrated reservoir characterization, BP, Houston, Texas (2000)

Inverse Problems and uncertainty estimation in Geophysics, TICAM, UT , Austin, Texas (2000)

Seismic waveform inversion: from isotropy to anisotropy, Shell Oil Company, Houston, TX (2000)

Normal moveout and Seismic waveform inversion in transversely isotropic media, Conoco, Ponca City, Oklahoma (2000)

Parameter Estimation in Anisotropic Media, Phillips Oil Company, Barttlesville, Oklahoma (2000)

Free surface multiple attenuation in reflection seismic data, ONR Broadband Signal Processing Working Group Meeting, Applied Research Laboratory, University of Texas at Austin, Austin, Texas (1999)

Seismic Waveform Inversion and Tomography: Examples of ill-posed geophysical inverse problems, PGS Seres, Houston, Texas (1999)

Processing of multi-component OBC data, PGS , Houston, Texas (1999)

Geophysical Inversion and Uncertainty Estimation, National Research Council Workshop on 'How uncertainty is treated in ocean science models?", National Academy of Sciences, Washington, D.C. (1999)

Inverse Problems, Statistics and a touch of philosophy, UTIG seminar, (1999)

Free surface multiple attenuation in the plane wave domain, Upstream Strategic Research Division, Mobil Oil Company, Dallas, Texas (1999)

Application of active source Seismology in imaging of subsurface structures, DARPA Geophysics Seminar, (1999)

Geophysical Inversion: Application to hydrocarbon exploration, DOE Workshop on Global inversion of Geophysical Data, (1999)

Geophysical Inversion : Theory and Practice, Southwest Research Institute, San Antonio, Texas (1998)

AVO and Seismic Inversion in he Plane Wave Domain, Mobil Strategic Research Center, Dallas, TX (1998)

AVO and Seismic Lithology, Oil and Natural Gas Commission, Calcutta, India (1998)

AVO and Seismic Waveform Inversion in the Plane Wave Domain: Application to Gas Hydrate Data, Society of Petroleum Geophysicists, Chennai, India (1998)

Seismic Wave Propagation Modeling: Current Status and Future Trends, Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas (1997)

Practical Approaches to Uncertainty Estimation in Geophysical Inversion, Sociedade Brasileira de Geofisica, Sao Paulo, Brazil (1997)

"To Bayes or not to Bayes", PPPG, Federal University of Bahia, Salvador, Brazil (1997)

Mapping of Elastic properties of gas hydrates, Amoco EPTG, Tulsa, OK (1997)

Global Optimization Methods and Migration Velocity Analysis, Oil and Natural Gas Commission, Calcutta, India (1996)

"To Bayes or not to Bayes", Society of Petroleum Geophysicists, Oil and Natural Gas Commission, Dehradun, Indi (1996)

Inverse methods and uncertainty estimation in geophysics, Western Atlas Wireline Service, Houston, TX (1996)

Gibbs' sampler and its application to geophysical inversion, SIAM meeting on Geophysical Inverse Problems in Geophysics, Fish Camp, CA (1995)

Optimization methods for automatic velocity estimation, SIAM meeting on Geophysical Inverse Problems in Geophysics, Fish Camp, CA (1995)

Nonlinear geophysical inversion, Department of Petroleum and Geosystems Engineering, University of Texas at Austin, Austin, TX (1995)

Nonlinear geophysical inversion, Indian Institute of Technology, Kharagpur, India (1994)

Global optimization methods in geophysical inversion and Seismic migration and modeling in 3-D, National Geophysical Research Institute, Hyderbad, India (1994)

Nonlinear geophysical inversion, Indian School of Mines, Dhanbad India (1994)

Nonlinear optimization methods in geophysics, Delft University of Technology, The Netherlands (1994)

Nonlinear optimization methods in geophysics, University of Potsdam, GeoForschungs Zentrum, Potsdam, Germany (1994)

Global optimization methods in geophysical inversion, University of Utrecht, The Netherlands (1994)

Bayesian inference, Gibbs' sampler and uncertainty estimation in nonlinear geophysical inversions, Department of Computational and Applied Mathematics, Rice University, Houston, Texas (1993)

Geophysical inversion using global optimization, Society of Industrial and Applied Mathematics Conference on Mathematical and Computational Issues in the Geosciences, Houston, Texas (1993)

High resolution shallow water 3-D survey and inversion for geophysical parameters, Acoustical Society of America, Ottawa, Canada (1993)

Nonlinear inversion of geophysical data, Department of Geophysics, Center for Tectonophysics, Texas A&M University, (1992)

Genetic Algorithms, Naval Research Laboratory, Stennis Space Center, MS (1992)

Modeling of wave propagation Los Angeles Basin, CICESE, Mexico (1990)

Multifold path integral synthetic seismograms, Seismological Laboratory, California Institute of Technology, Pasadena, CA (1987)

Kirchhoff-Helmholtz reflection seismograms, SOHIO Petroleum Company, Dallas, TX (1985)

"Global optimization methods in geophysical inversion" to be entered

"Seismic modeling, migration, and inversion" (one-week short course taught at companies) to be entered

"Seismic modeling and inversion: the state of the art" to be entered

"Seismic inversion: theory and practice" to be entered