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This profile was last updated on 2/27/14  and contains information from public web pages and contributions from the ZoomInfo community.

Dr. Colin M. Sayers

Wrong Dr. Colin M. Sayers?

Scientific Advisor, Seismic

Schlumberger Limited
5599 San Felipe 17Th Floor
Houston, Texas 77056
United States

Company Description: Schlumberger Limited (Schlumberger) is a supplier of technology, integrated project management and information solutions to customers working in the oil and gas...   more
Background

Employment History

Board Memberships and Affiliations

Education

  • BA , physics
    University of Lancaster , U.K.
  • PhD , physics
    Imperial College
58 Total References
Web References
Geophysical Society of Houston - Articles
www.gshtx.org, 11 Feb 2004 [cached]

Seismic Anisotropy of Shales
What determines the sign of Thomsen's delta parameter?

 A presentation by Colin Sayers (Schlumberger) to the GSH Rock Physics SIG on March 24, 2004.

Abstract: Shales are a major component of sedimentary basins, and play a decisive role in fluid flow and seismic wave propagation because of their low permeability and anisotropic microstructure. An understanding of shale anisotropy is important in order to reliably extract reservoir fluid, lithology and pore pressure from seismic data, and to understand time-to-depth conversion errors and non-hyperbolic moveout. Figure 1 compares the three anisotropy parameters , and  of Thomsen (1996) for the shales studied by Jones and Wang (1981), Vernik and Nur(1992), Hornby (1994), Johnston and Christensen (1995) and Wang (2002). It is seen that while and  are positive for all samples, takes both positive and negative values. Currently, no understanding for the varying sign of exists, despite the fact that  is arguably the most important anisotropy parameter for conventional seismic data, since it is the only anisotropy parameter needed to understand the difference between the small-offset normal moveout velocity and vertical velocity, and to interpret the small-offset AVO response (Thomsen, 1986). 

Figure 1

Figure 1: Plot of  and versus  for the shales studied by Jones and Wang (1981), Vernik and Nur (1992), Hornby (1994), Johnston and Christensen (1995) and Wang (2002).

The seismic anisotropy of shales results from a partial alignment of anisotropic plate-like clay minerals (Kaarsberg, 1959; Tosaya, 1982; Sayers, 1994, 1999).

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A presentation by Colin Sayers (Schlumberger) to the GSH Rock Physics SIG on March 24, 2004.
...
The seismic anisotropy of shales results from a partial alignment of anisotropic plate-like clay minerals (Kaarsberg, 1959; Tosaya, 1982; Sayers, 1994, 1999). Although single crystal elastic constants for the clay minerals occurring in shales are unavailable, the crystallographic structure and composition of illite is similar to that of muscovite (Tosaya, 1982), for which c11=178 GPa, c33=54.9 GPa, c55=12.2 GPa, c12=42.4 GPa, and c13=14.5 GPa (Angenheister, 1982). The Thomsen anisotropy parameters for Muscovite calculated from these values are = 1.1211, = -0.2368 and = 2.2787. This negative value of is inconsistent with the majority of shale samples shown in figure 1, which have a positive . In this presentation it is shown how the varying sign of can be understood in terms of the properties of the regions between clay particles and the degree of disorder in the clay particle orientation distribution function. The theory explains the variation seen in figure 1. Biography: Colin Sayers is Principal Geophysicist with the Schlumberger Data and Consulting Services Geomechanics Group in Houston. His professional interests include 3D mechanical earth modeling, pore pressure and drilling hazard prediction, time-lapse (4D) seismology, seismic reservoir characterization and monitoring, 4C seismology, AVO, stress-dependent acoustics, rock mechanics, borehole/seismic integration, seismic travel-time inversion, anisotropic velocity analysis and seismic characterization of fractured reservoirs. He has a Ph.D. from Imperial College, University of London, and is a member of the Society of Exploration Geophysicists (SEG), European Association of Geoscientists and Engineers (EAGE), Society of Petroleum Engineers (SPE) and American Geophysical Union (AGU). He is also a member of the Research Committee of the SEG. no http://www.gshtx.org/en/art/24/
SEG - DISC 2010 - Colin Sayers
www.seg.org, 10 Aug 2010 [cached]
Colin Sayers SEG - DISC 2010 - Colin Sayers The Society of Exploration Geophysicists
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Colin Sayers, Schlumberger
Read an interview with Colin Sayers
Colin Sayers
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Colin Sayers is a Scientific Advisor in the Schlumberger Data & Consulting Services Geomechanics Group in Houston, USA, providing consultancy in geophysics, rock physics, drilling and reservoir geomechanics, and the characterization of fractured reservoirs. He entered the oil industry to join Shell's Exploration and Production Laboratory in Rijswijk, The Netherlands in 1986, and moved to Schlumberger in 1991.
SEG - DISC 2010 - Colin Sayers
www.seg.org, 10 Aug 2010 [cached]
2010 DISC | Geophysics under stress: Geomechanical applications of seismic and borehole acoustic waves | Abstract | 2010 SEG/EAGE Distinguished Instructor, Colin Sayers | Colin Sayers - 2010 DISC instructor | Geophysics under stress: Geomechanical applications of seismic and borehole acoustic waves
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2010 DISC | Geophysics under stress: Geomechanical applications of seismic and borehole acoustic waves | Abstract | 2010 SEG/EAGE Distinguished Instructor, Colin Sayers | Colin Sayers - 2010 DISC instructor | Geophysics under stress: Geomechanical applications of seismic and borehole acoustic waves
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Colin Sayers, Schlumberger
Read an interview with Colin Sayers
Colin Sayers
Dr Colin Sayers ...
fb.eage.org, 1 May 2013 [cached]
Dr Colin Sayers (Schlumberger) is to present his two day course 'Geophysics Under Stress: Geomechanical Applications of Seismic and Borehole Acoustic Waves' at the Second EAGE Workshop on Rock Physics taking place in Muscat, Oman from 11-15 January 2014.
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Colin Sayers, the EAGE Distin­guished Lecturer in 2010, is scientific advisor in the Schlumberger Data & Consulting Services Geomechanics Group in Houston, providing consul­tancy in geophysics, rock physics, drill­ing and reservoir geomechanics, and the characterization of fractured reservoirs.
Dr Colin Sayers ...
fb.eage.org, 1 May 2013 [cached]
Dr Colin Sayers (Schlumberger) is to present his two day course 'Geophysics Under Stress: Geomechanical Applications of Seismic and Borehole Acoustic Waves' at the Second EAGE Workshop on Rock Physics taking place in Muscat, Oman from 11-15 January 2014.
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