Online Rock Physics SIG: Shale Crush Point - May 13th
Sponsored By: NER, CGG and Ikon Science
Online Only, you must pre-register to receive access instructions.
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Speaker: Joe Higginbotham, Z-Terra, Inc.
A rock physics model that involves combining Gassmann's equations with Nur's critical porosity model. This theory leads to a hyperbolic relation between Vp and Vs with coefficients that are constant for a given mineral as porosity changes. Similarly it leads to another relation between rock bulk density and Vp. The hyperbolic relation between Vp and Vs matches up quite well with measurements that have been reported for sandstone, limestone, and shale.
There is a problem with shale because measurements by Mondol et al. (2008, TLE) don't seem to follow Nur's model which would suggest that the theory should not work for shale. However, if the shale data is assumed to have a "crush point" where the overburden stress causes a quick change in strain instead of a gradual change, then the data of Mondol et al. will support Nur's model and the full theory seems to apply to shales.
Speaker Biography: Joe Higginbotham, Z-Terra, Inc.
Joseph (Joe) H. Higginbotham received his MS and PhD in physics from the University of Toledo, Toledo Ohio – his thesis work was published in the Journal of Physics B, and in Physical Review. He took a job in aerospace shortly afterward working on navigation software for the space shuttle and studying the non-linear response of accelerometers. Joe also designed vibration simulation software, using scaled integer math, that could be run inside fighter aircraft navigation computers to allow tests of installed navigation software. In late 1979 Joe took a position with Texaco in the Exploration and Production Technology Department where he worked on wave equation imaging software. Joe was the first to do imaging in a tilted coordinate system – Texaco did not allow publication until 1985. He designed a processing system, SEISPAK, that was used by the Texaco R&D staff through the 1980’s and 90’s for development and testing of seismic data processing software. After Texaco and Chevron merged Joe continued to use SEISPAK to support his research and to do survey simulation for Chevron. Joe retired from Chevron in August of 2006 with a license from Chevron to use SEISPAK, which supports automatic parallel processing, freely within the industry. He worked briefly for 3D Geo and in June of 2007 Joe founded Wave Imaging Technology Inc. Joe was joined at Wave Imaging by Morgan Brown in October and together they ran the company for over six years providing quality depth imaging and seismic simulation services, in the SEISPAK system, to large and small companies around the world. In October of 2013, Wave Imaging Technology was sold to GEOCENTER which later became SEIMAX. Joe worked at SEIMAX until mid spring of 2018 when he left SEIMAX to take his current position as Chief Technical Advisor at Z-Terra. Joe became interested in rock physics through the development of software for seismic amplitude analysis.
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5:30pm Presentation Begins
6:30pm Adjourn
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