Modeling pore pressure evolution in organic shale under the effect of maturation
- Xuan Qin (University of Houston) | De-Hua Han (University of Houston) | Luanxiao Zhao (Tongji University)
- 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
- Shale, Pore pressure, Rock physics, Modeling
- 0 in the last 30 days
- 25 since 2007
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We devise a workflow to model the pore pressure increase in organic shale to better characterize the shale reservoirs. In particular, the proposed model considers the microstructure in organic shale and the volume fraction variations of rock components during the maturation. The pore pressure increase is solved based on the compressibility and volumes of pore space and pore fluids. Our modeling results agree that the evolution of organic shale’s rock-physics property during kerogen maturation is consistent with fluid expansion model that sonic velocity decrease while density changes little when unloading occurs.
Presentation Date: Wednesday, October 17, 2018
Start Time: 8:30:00 AM
Location: 202A (Anaheim Convention Center)
Presentation Type: Oral
|File Size||602 KB||Number of Pages||5|
Backus,G.,1962,Long-wave elastic anisotropy produced by horizontal layering:Journal of Geophysical Research,67,4427–4440,10.1029/JZ067i011p04427.
Berryman,J. G.,1980,Long-wavelength propagation in composite elastic media:The Journal of the Acoustical Society of America,68,1809–1819,10.1121/1.385171.
Carcione,J. M.,H. B.Helle, andP.Avseth,2011,Source-rock seismic-velocity models: Gassmann versus Backus:Geophysics,76,no.5,N37–N45,10.1190/geo2010-0258.1.
Ciz,R., andS. A.Shapiro,2007,Generalization of Gassmann equations for porous media saturated with a solid material:Geophysics,72,no.6,A75–A79,10.1190/1.2772400.
Domenico,S. N.,1976,Effect of brine-gas mixture on velocity in an unconsolidated reservoir:Geophysics,41,882–894,10.1190/1.1440670.
Guo,Z.,X.Li,C.Liu,X.Feng, andY.Shen,2013,A shale rock physics model for analysis of brittleness index, mineralogy and porosity in the Barnett Shale:Journal of Geophysics and Engineering,10,025006,10.1088/1742-2132/10/2/025006.
Hornby,B. E.,L. M.Schwartz, andJ. A.Hudson,1994,Anisotropic effective-medium modeling of the elastic properties of shales:Geophysics,59,1570–1583,10.1190/1.1443546.
Lucier,A. M.,R.Hofmann, andL. T.Bryndzia,2011,Evaluation of variable gas saturation on acoustic log data from the Haynesville Shale gas play, NW Louisiana, USA:The Leading Edge,30,300–311,10.1190/1.3567261.
Milliken,K. L.,M.Rudnicki,D. N.Awwiller, andT.Zhang,2013,Organic matter-hosted pore system, Marcellus Formation (Devonian), Pennsylvania:AAPG Bulletin,97,177–200,10.1306/07231212048.
Nishizawa,O.,1982,Seismic velocity anisotropy in a medium containing oriented cracks:Journal of Physics of the Earth,30,331–347,10.4294/jpe1952.30.331.
Ramdhan,A. M., andN. R.Goulty,2011,Overpressure and mudrock compaction in the Lower Kutai Basin, Indonesia: A radical reappraisal:AAPG Bulletin,95,1725–1744,10.1306/02221110094.
Sayers,C. M.,1994,The elastic anisotropy of shales:Journal of Geophysical Research,99,767–774,10.1029/93JB02579.
Sone,J., andM. D.Zoback,2013,Mechanical properties of shale-gas reservoir rocks—Part 1: Static and dynamic elastic properties and anisotropy:Geophysics,78,no.5,D381–D392,10.1190/geo2013-0050.1.
Vernik,L., andJ.Milovac,2011,Rock physics of organic-rich shales:The Leading Edge,30,318–323,10.1190/1.3567263.
Zhao,L.,X.Qin,D.Han,J.Geng,Z.Yang, andH.Cao,2016,Rock-physics modeling for the elastic properties of organic shale at different maturity stage:Geophysics,81,no.5,D527–D541,10.1190/geo2015-0713.1.