February 2012

Seismic and Microseismic in Unconventional Resource Evaluation

Galen Treadgold and Ross Peebles, Global Geophysical Services

Abstract Summary

Seismic and microseismic data is playing an increasing role in understanding the variability of the various resource plays. Unconventional reservoir sections (shales, tight sands, tight fractured carbonates) considered relatively uniform across broad areas have yielded surprising test results leaving operators to question their often simplistic geologic models. Information on structure, stratigraphy, reservoir quality and fracability is available from the seismic assuming the data are acquired and processed correctly. Microseismic studies can reveal permeability networks that ultimately control production while demonstrating aquifer integrity. Integrated studies combining well performance with seismic attributes and microseismic results are allowing sweet-spot detection and mapping. Our presentation will show the seismic and microseismic expressions of a number of unconventional oil and gas plays with emphasis on the Eagle Ford Shale – discussing best practices for unconventional exploration in a not so simple reservoir setting.

Biographical Sketch

Galen E. Treadgold, vice president of Weinman GeoScience (a division of Global Geophysical), received a BS in Geology and Marine Science in 1982 from the University of Miami before starting his geophysical studies at the University of Texas at Austin and receiving an MA in Geology/Geophysics in 1985. Galen joined ARCO that same year and over the next 15 years worked in various technology, exploration and management positions including coordinating AVO projects, teaching the first ARCO AVO school, managing the ARCO British technology group and managing ARCO’s Trinidad and Venezuela exploration effort. In 2000, Galen joined Weinman Geoscience where he’s held the position of chief geophysicist and now, vice president. Galen’s main interests are unconventional reservoir characterization and azimuthal analysis for fracture detection. He’s given recent talks at the 2011 SEG in San Antonio, the 2010 Hedberg Conference in Austin and the 2011 Eagle Ford DUG conference in San Antonio.