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  • GSOC Seminar and Lunch Featuring Bob Hardage

GSOC Seminar and Lunch Featuring Bob Hardage

  • 25 Jan 2016
  • 11:30 AM - 1:00 PM
  • OKC History Center 800 Nazih Zuhdi Drive Oklahoma City, OK 73105

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  • As a courtesy to those members in between jobs, the GSOC would like to encourage you to continue attending our regular events. Please contact a GSOC officer for a discount code that can be used to waive the registration fee.

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Creating S-Wave Images and S Attributes from Legacy P-Wave Data Acquired with Vertical Geophones

 Bob Hardage, Senior Research Scientist, BEG UT Austin

Abstract

          The Exploration Geophysics Laboratory (EGL) at the Bureau of Economic Geology has developed technology that allows S-wave images and S attributes to be extracted from seismic data generated by common vertical-displacement sources (i.e. P-wave sources). The S mode used in these applications is not a P-to-SV converted mode but is a direct-SV mode produced exactly at the point where a P source applies its vertical displacement to the earth.

          If P-source data are recorded with 3C geophones, the direct-P and direct-SV illuminating wavefields embedded in the data allow full-elastic imaging of all possible P and S modes to be done. If P-source data are acquired with only vertical geophones, then only two images can be made. One image is the usual P-P image that is produced by the downgoing illuminating P wavefield. The second image is a SV-P (converted-P) image produced by the downgoing illuminating SV wavefield.

           SV-P data provide the same image and the same S attributes as P-SV data, the latter data now being used by several exploration companies. An important advantage of constructing S images and S attributes from vertical-geophone data is that this S-wave information is lying dormant in 1000’s of square miles of legacy P-wave data residing in seismic data libraries. By applying this EGL technology to legacy P-wave data, operators can engage in S-wave reflection seismology without having to record new data. 

          This presentation will illustrate the physics involved in direct-P and direct-SV illumination by common P-wave sources and show real-data examples of S-wave reflection seismology being applied across exploration prospects with P-wave sources.

Speaker Biography

Bob A. Hardage received a PhD in physics from Oklahoma State University. He worked at Phillips Petroleum for 23 years followed by management positions at WesternAtlas. He then established a multicomponent seismic research laboratory at the Bureau of Economic Geology where he is now Senior Research Scientist. He has been a member of SEG for 49 years and an AAPG member for 45 years. He has served SEG as assistant editor, editor, first vice president, president-elect, president, past-president, chair of technical program committee for two annual meetings, honorary lecturer, and short course instructor. SEG has awarded Bob a special commendation, life membership, and honorary membership. He wrote the monthly Geophysical Corner column for AAPG’s Explorer magazine for six years. AAPG has honored Bob with a distinguished service award for promoting geophysics among the geologic community.




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