Anisotropic soft porosity model for multiple facies types
- Michelle Ellis (RSI) | Olivier Kirstetter (Repsol)
- Document ID
- Society of Exploration Geophysicists
- 2018 SEG International Exposition and Annual Meeting, 14-19 October, Anaheim, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Exploration Geophysicists
- Clastic, Facies, Anisotropy, Porosity, Carbonate
- 1 in the last 30 days
- 19 since 2007
- Show more detail
We present an anisotropic rock physics model which can be used to estimate velocities for different facies types (sands, shales and carbonates). The model uses a combination of the joint Self Consistent, Approximation and Differential Effective Medium model (SCA/DEM) and the Hudson model for fractures. The SCA/DEM model is used to build the frame of the rock and the Hudson model adds fractures in 3 orthogonal directions with varying concentrations inducing anisotropy. Allowing the model parameters to change gives enough flexibility to the model to model different facies including sands and carbonates. The model has been tested against sand, shale and carbonate data from well logs in the Barents Sea and the North Sea. Anisotropy for this well was estimated using the method of White (1983). Results show a good fit between the rock model and the data.
Presentation Date: Thursday, October 18, 2018
Start Time: 8:30:00 AM
Location: 202A (Anaheim Convention Center)
Presentation Type: Oral
|File Size||811 KB||Number of Pages||5|
Berryman,J.,1980,Long-wavelength propagation in composite elastic media I. Spherical inclusions:Journal of the Acoustical Society of America,68,1809–1819,10.1121/1.385171.
Hudson,J. A.,1980,Overall properties of a cracked solid:Mathematical Proceedings of the Cambridge Philosophical Society,88,371–384,10.1017/S0305004100057674.
Norris,A. N.,1985,A differential scheme for the effective moduli of composites:Mechanics of Materials,4,1–16,10.1016/0167-6636(85)90002-X.
Ruiz,F., andA.Cheng,2010,A rock physics model for tight gas sand:The Leading Edge,29,1484–1489,10.1190/1.3525364.
Sheng,P.,1990,Effective-medium theory of sedimentary rocks:Physical Review B,41,4507–4512,10.1103/PhysRevB.41.4507.
Thomsen,L.,1986,Weak elastic anisotropy:Geophysics,51,1954–1966,10.1190/1.1442051.
Tsvankin,I.,1997,Anisotropic parameters and P-wave velocity for orthorhombic media:Geophysics,62,1292–1309,10.1190/1.1444231.
Wang,1990,Seismic anisotropy in sedimentary rocks, part 2: Laboratory data:Geophysics,67,1423–1440,10.1190/1.1512743.