Application of dual-energy CT scan to analyse and predict rock properties in core analysis
Tomography has been used in the oil and gas industry for more than 20 years to study core sample properties and visualise fluid flow [1 - 8]. Qualitative tomography provides information on heterogeneity , petrographic change, fissure, cavity and penetration level of drilling muds, whereas quantitative tomography in addition to the above applications is also used to calculate the bulk density, porosity, and calibration of logging curves.
The article presents the method for prediction of rock properties (such as grain density and porosity, etc.) from the results of CT scans using Dual-energy CT Scanning - DECT at 140 kV and 80 kV. The CT scan results are compared with the values of the geophysical curve, showing a great potential in determining the physical properties of the reservoir rock as well as the reservoir fluid.
S.L. Wellington and H.J. Vinegar, “X-ray computerized tomography”, Journal of Petroleum Technology, Vol. 39, No. 8, pp. 885 - 898, 1987.
Patricia K. Hunt, Philip Engler, and Caroline Bajsarowicz, “Computed tomography as a core analysis tool: Applications, instrument evaluation, and image improvement techniques”, Journal of Petroleum Technology,Vol. 40, No. 9, pp. 1203 - 1210, 1988.
E.M. Withjack, “Computed tomography for rockproperty determination and fluid-flow visualization”, SPE Formation Evaluation, Vol. 3, No. 4, pp. 696 - 704, 1988.
A. Kantzas, “Investigation of physical properties of porous rocks and fluid flow phenomena in porous media using computer assisted tomography”, In Situ,Vol. 14, No. 1, p. 77 - 132, 1990.
A. Bansal and M.R. Islam, “State-of-the-Art review of nondestructive testing with computer-assisted tomography”, International Arctic Technology Conference, Anchorage,AK, 29 - 31 May 1991.
S. Saner, “A review of computer tomography and petrophysical applications (Sabbatical research, 1993 - 1994)”, King Fahd University of Petroleum and Minerals, Dhahran, KSA, 1994.
S. Akin and A.R. Kovscek, “Use of computerized tomography in petroleum engineering research”, Annual Report of SUPRI TR 127, Stanford University, Stanford, CA, pp. 63 - 83, 2001.
E.M. Withjack, C. Devier, and G. Michael, “The role of computed tomography in core analysis”, SPE Western Regional/AAPG Pacific Section Joint Meeting, Long beach, CA, 19 - 24 May 2003.
Shameem Siddiqui, James Funk, and Aon Khamees, “Static and dynamic measurements of reservoir heterogeneities in carbonate reservoirs”, 2000 SCA Symposium, Abu Dhabi, UAE, 18 - 22 October 2000.
S. Siddiqui, P.J. Hicks, and A.S. Grader, “Verification of buckley-leverett three phase theory using computerized tomography”, Journal of Petroleum Science and Engineering,Vol. 15, No. 1, pp. 1 - 21, 1996.
A. Sahni, J.E. Burger, and M.J. Blunt, “Measurement of three- phase relative permeability during gravity drainage using CT scanning”, SPE/DOE Improved Oil Recovery Conference, Tulsa, OK, 19 - 22 April 1998.
G.K. Von Schulthness and H-G Smith, Encyclopaedia of edical imaging - Vol. 1: Physics, Technology and Procedures. Martin Dunitz Ltd., London, UK, 1998.
Q. Lu, “The utility of X-ray dual-energy transmission and scatter technologies for Illicit material detection”,Ph.D. Dissertation, Virginia Polytechnic Institute, Blacksburg, VA, 1999.
J.S. Gardner and J.L. Dumanoir, “Litho-Density log interpretation”, SPWLA Twenty-First Annual Logging Symposium Transactions, 8 - 11 July 1980.
H. Edmundson and L.L. Raymer, “Radioactive logging parameters for common minerals”, SPWLA Twentieth Annual Logging Symposium Transactions, 3 - 6 June 1979.
O. Serra, Schlumberger element mineral rock catalog. Schlumberger Publications, 1990.
M. Rider, The geological interpretation of well logs. Gulf Publishing Co., Houston, TX, 1996.
R. Angulo and N. Ortiz, “X-Ray tomography aplications in porous media evaluation”, 2nd Latin American Petroleum Engineering Conference (LAPEC), Caracas, Venezuela, 8 - 11 March 1992.
Schlumberger, Log interpretations charts. Schlumberger Publications, 1995.
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