Dr. Andrew Hajash

Professor

Research:

• Experimental investigations of water/rock interactions in the subsurface:
• Chemical and mechanical aspects of solution-transfer creep and pressure solution.
• kinetics of pore-volume loss and mineral-water reactions at diagenetic temperatures and pressure with non-zero effective stress; effects of temperature, grain size, stress, strain, flow rate, and saturation state.
• The effects of organic acids on porosity modification in sandstone reservoirs.
• role of carboxylic acids on mineral solubility, dissolution kinetics, pH-buffering, metal-ligand complexes, aluminum mobility, and generation of porosity.

Projects:

Fluid-Assisted Compaction and Deformation of Reservoir Lithologies, Kronenberg, Chester, Chester, and Hajash (Co-P.I.) Department of Energy, $64,733, (2/02-1/03)

Experience:

• Department Head, Department of Geology and Geophysics, Texas A&M University, College Station, Texas, January, 1999 - 2003.
• Assistant Head, Department of Geology and Geophysics, Texas A&M University, College Station, Texas, June, 1996 - December, 1998.
• Professor, Department of Geology and Geophysics, Texas A&M University, College Station, Texas, January, 1994 - present.
• Associate Professor, Department of Geology, Texas A&M University, College Station, Texas, December 1981 - December 1993.
• Consultant, Amoco Production Company, Tulsa, Oklahoma, June 1985 - August 1985.
• Research Scientist, Senior Grade, Amoco Production Company, Tulsa Research Center, Tulsa, Oklahoma, June 1983 - August 1983.
• Research Scientist, Senior Grade, Amoco Production Company, Tulsa Research Center, Tulsa, Oklahoma, June 1982 - August 1982.
• Assistant Professor, Department of Geology, Texas A&M University, College Station, Texas, May 1975 - December 1981.

Publications:

• He, Wenwu, Sparks, D., and Hajash, A., Evolution of Fluid Chemistry in Quartz Compaction Systems: Experimental Investigations and Numerical Modeling, Submitted to Geochemica et Cosmochemica Acta, October, 2006, Accepted May, 2007, Revised manuscript submitted July 2007
• Chester, F. M., J. S. Chester, A. K. Kronenberg, and A. Hajash (2007), Subcritical creep compaction of quartz sand at diagenetic conditions: Effects of water and grain size, J. Geophys. Res., 112, B06203, doi:10.1029/2006JB004317.
• Karner, S. L., Chester, J. S., Chester, F. M., Kronenberg, A. K, and Hajash, A. 2006, Hydrothermal Deformation of Granular Quartz Sand, submitted August 2006 to Journal of Geophysical Research.
• Chester, F., Chester, J., Kronenberg, A., and Hajash, A, Subcritical Creep Compaction of Quartz Sand at Diagenetic Conditions: Effects of Water and Grain Size, submitted December 2005 to Journal of Geophysical Research.  Accepted Feb.23, 2007.
• Karner, S. L., Chester, J. S., Chester, F. M., Kronenberg, A. K, and Hajash, A., 2005, Laboratory deformation of granular quartz sand: Implications for the burial of clastic rocks, Am. Assoc. Petrol. Geol. Bulletin, v. 85, 603-625.
• He, W, Hajash, A., and Sparks, D., 2003, Creep compaction of quartz aggregates: Effect of pore-fluid flow rates - A combined experimental and theoretical study, American Journal Science, v. 303, 73-93.
• He, W. Hajash, A., and Sparks, D., 2002, A model for porosity evolution during compaction of sediments, Earth and Planetary Science Letters, v. 197, 237-244.

Awards:

• Distinguished Achievement Award in Teaching (University Level) by the Association of Former Students of Texas A&M University (2002)
• Invited by Professor Zhengyu BAO to visit the Department of Geochemistry, China University of Geosciences in Wuhan, PRC (1998)

Links:

• Center for Tectonophysics
• Environmental & Engineering Geosciences and Hydrogeology
• Geochemistry, Mineralogy, and Petrology

Memberships in Professional Societies:

• Geological Society of America
• American Geophysical Union

Compact With Texans - Privacy Statement - Legal Notices - Accessibility Policy
© 2006 All rights reserved - Webmaster - Texas A&M University - College Station, Texas 77843