Volume 7, No. 1, January 1996

CREWES News

The Consortium for Research in Elastic Wave Exploration Seismology

Blackfoot Update

The 3C-3D processing is progressing well. We're very pleased with the data quality, especially the converted-wave data. Pulsonic anticipates that P-P and P-S processing will be completed sometime in March. The 3D VSP which was acquired simultaneously is being processed by Western Atlas and ourselves. In the meantime, we continue to work with the 2-D broad-bandwidth Blackfoot survey. Shown below is the 2 Hz vertical-component migrated data, processed by Wai-kin Chan. Wai-kin used a prestack migration based on Gardner's work (Gardner, G.H.F.,Wang, S.Y., Pan, N.D., and Zhang, Z., 1986, Dip Moveout and Prestack Imaging. OTC Annual Meeting, Houston). This Kirkchoff-type migra-tion involves 3 steps: DMO, PSI (prestack imaging) and NMO correction and stack. Using this approach, velocity analysis is postponed until the end of the process and there is no need to re-iterate DMO and PSI if the migration velocity changes. Based on previous work, the Glauconitic incised valley is interpreted at about 1.05 - 1.07 ms, from CDPs 3220 to 4220.


Newsletter on the Web

Starting with this issue, CREWES NEWS can be accessed on the World Wide Web through the CREWES page:
http//:www.crewes.ucalgary.ca

New Software

16 CREWES staff and students are participating in a 5 day ProMAX training course put on by Advance Products Group and taught by Paul Peterman. This course will cover the basics of 2D and 3D processing on the ProMAX system. Thanks very much to Gulf Canada, especially Ted Logan, for providing addi-tional workstations for this course.

We have obtained 3 licenses for GX's modelling package for 3D VSP design, visualization, and interpretation verification. It allows geologically complex models such as salt overhangs and thrust-fault structures with vertical and lateral velocity variations. Ray-traced synthetic seismic models can incorporate mul-tiples, mode conversions and 3-C amplitude and phase effects.

CREWES and the Foothills Research Project have just acquired 10 licences of ER MAPPER, a processing and visualisation package for remote sensing and geophysical data, with links to several Geographic Information Systems. This software can be linked to existing seismic applications, such as Landmark's Seisworks, and used to interpret seismic horizons from 3D and 2D data sets.


Personnel

We welcome Grace Yang to the CREWES Project staff. Grace has a B.Sc. in physics and a M.Sc. in geophysics from the National Taiwan University and the National Central University in Taiwan. She studied geophysics at the University of Alberta for two years before she worked for Petro-Canada in seismic interpretation for seven years. She received her M.Sc. in Geomatics Engineering from the University of Calgary in 1995. Grace is currently working on the Olds 9-C seismic data recently donated by Amerada Hess.
Xinxiang Li is a new M.Sc. student who will be working under the supervision of Dr. John Bancroft. Xinxiang received his B.Sc. in Mathematics from Peking University, P.R.C. in 1987, and his M.Sc. in Applied Mathematics from Tsinghua University, P.R.C, in 1989. He then worked for the Chinese Academy of Sciences in the Computing Center and the Institute of Sofware. Xinxiang will be working on seismic processing development.
Welcome back to Zandong Sun, who previously did his M.Sc. in Geophysics with Jim Brown, and is now pursuing his Ph.D. Zandong will continue working at Imperial Resources Ltd. while studying under the supervision of Rob Stewart. He will focus on processing 3-C seismic data in structurally complex areas.
A tip of the hat to Don Easley, who successfully defended his Ph.D. thesis in January. Don, working under the supervision of Dr. Jim Brown, studied several topics in multicomponent seismology: shear waves from vertical vibrators, composite media as generalized continua, elastic tensors and their preferred frames of reference, and Goupillard P- and S-wave synthetic seismograms. Don has been working with Amoco Canada for the past couple of years and will continue on there. Good work, Don!

Profile: Maria Donati

Maria entered the M.Sc. Program in Geophysics in January 1994 and has been working with CREWES under the supervision of Dr. Robert Stewart. She holds a B.Sc. in Physics (option Geophysics) from the University Simon Bolivar, Venezuela, and worked in the M.Sc. program in Prospecting Geophysics in the Universidad Central de Venezuela from 1988-1991. In 1988 she won the Best Student Paper Award given by the Geophysicist Engineers Society of Venezuela. She has enjoyed work experience as a seismic data processor with Seismograph Service Corpo-ration and was involved in projects in the El Tablazo, Chama and Tomoporo areas. In 1989 she joined Intevep S.A., the Oil Research Company of Petroleos de Venezuela, where she has been working with imaging of complex structures using VSP data, migration, AVO analysis, time-to-depth conversion and aniso-tropic modeling. Intevep S. A. is financially supporting her in her studies at the University of Calgary. Her professional affiliations include the SEG, CSEG and SOVG (Venezuela).

Maria has presented some papers in Venezuela and also presented her work on modal filter separation at the 1995 CSEG. Work related to anisotropy studies was presented at the 1995 SEG Convention in Houston as: Birefringence study in a 3C-2D data: Barinas, Venezuela (coauthor: Jim Brown). Maria and Rob Stewart have a paper in press in the Journal of Seismic Exploration on P-P and P-S separation at a liquid-solid contact. This paper outlines one of the preprocessing steps for analysis of sub-sea seismic recordings.


When Newton saw an apple fall, he found ... A mode of proving that the earth turned round In a most natural whirl, called gravitation; And thus is the sole mortal who could grapple Since Adam, with a fall or with an apple. Lord Byron, 1788-1824

Making Contact...

The CREWES Project
Dept. of Geology & Geophysics
University of Calgary
2500 University Dr. N.W.
Calgary, Alberta
T2N 1N4 CANADA

Fax: (403)284-0074
Email: crewes@geo.ucalgary.ca
WWW (World Wide Web):
http://www.crewes.ucalgary.ca/

Administrative Secretary:
Louise Forgues: 220-8279
Editor: Sue Miller

Directors:
Dr. Robert Stewart: 220-3265
Dr. Jim Brown: 220-7484
Dr. Don Lawton: 220-5718

Research Staff:
Dr. John Bancroft: 220-5026
Malcolm Bertram: 220-3267
Henry Bland: 220-8461
Darren Foltinek: 220-6137
Eric Gallant: 220-3259
Stan Gorek: 220-4292
Dr. Gary Margrave: 220-4606
Sue Miller: 220-7462
Grace Yang: 220-8969
Qi Zhang: 220-3264

Graduate Students
Jill Belisle:220-3271
Siriporn Chaisri: 220-3083
Wai-Kin Chan: 220-8093
Maria Donati: 220-6444
Jocelyn Dufour: 220-8266
Ken Fang: 220-8093
Robert Ferguson: 220-3271
Helen Isaac: 220-8396
Glenn Larson: 220-3458
Xinxiang Li: 220-6749
Nicolas Martin: 220-3083
Darryl Parry: 220-3032
Chanpen Silawongsawat: 220-3083
Zandong Sun: 220-6444
Dan Vetrici: 220-3269
Shaowu Wang: 220-5027
Hans Westbroek: 220-6596