Anisotropy and spatial variation of relative permeability and lithologic character of Tensleep Sandstone reservoirs in the Bighorn and Wind River basins, Wyoming. Quarterly report, January 1, 1996--March 31, 1996 Page: 4 of 6

because the nutrient solution (0.25 mol/1 NaCl solution) was highly undersaturated with
respect to the mineral. Concentrations of Ca and SO4, however, decreased with reaction
time, and Ba concentration increased, so that the solution was saturated with respect to
barite throughout the run. These results are in contrast to those of previous runs, in
which the nutrient solution originally saturated with respect to anhydrite was used.
Dolomite dissolved into solution at a relatively constant rate (average alkalinity was
about 16 mmol/l), whereas the solution remained undersaturated with respect to
dolomite.
The fifth CO2 core-flooding experiment was carried out during this quarter at the
Petroleum Technology Center, Marathon Oil Company, Littleton, Colo. Temperature and
pressure conditions were similar to those in prior runs [80*C and 166 bars (Pco2 = Ptotal-
In this experiment, Tensleep oil from the Oregon Basin oil field was used as well as
subsurface cores from the Oregon Basin oil field and synthetic 0.25 mol/l NaCl solution.
Prior to the experiment, three cores were saturated with brine and then some aliquot of
brine was replaced by oil. The initial water saturation of the three cores was 28, 28, and
34%. The brine, which was saturated with CO2 gas at run conditions, was injected into the
core assemblage, so that oil as well as brine came out of cores with time. Thus, this
experiment simulated a CO2 flood in a more realistic manner than in previous runs. The
total run duration was 143 hrs.
Work in the next quarter will include chemical analyses of sample solutions and
cores of the fifth run and chemical modeling of sample solutions. Those data will be
synthesized with those obtained through all of previous core flooding experiments as well
as data on Tensleep formation-water chemistry to establish the susceptibility of the
Tensleep formation to formation alteration and wellbore damage due to CO2 treatment.
Technical Transfer
Our website for project results and updates now contains the first and second
annual reports as well as these two recently accepted abstracts. Our website may be
accessed at http://garfield.uwyo.edu/doe/tensleep.html. In the future this site will contain
additional detailed information, data, and updates on conclusions reached.
References
1. E.D. Pittman, 1992, Artifact porosity in thin sections of sandstones: Journal of
Sedimentary Geology, v. 62, p. 734-737.
2. R. Ehrlich, S.J. Crabtree, K.O. Horkowitz, and J.P. Horkowitz, 1991, Petrography
and reservoir physics I: Objective classification of reservoir porosity: American
Association of Petroleum Geologists Bulletin, v. 75, p. 1547-1562.
3. K. Ruzyla, 1986, Characterization of pore space by quantitative image analysis:
Formation Evaluation, v. 1, p. 389-398.
4. T. Mowers and D.A. Budd, 1996, Quantification of porosity and permeability
reduction due to calcite cementation using computer-assisted petrographic image
analysis techniques: American Association of Petroleum Geologists Bulletin, v. 80,
p. 309-322.
5. M. Honarpour, L. Koederitz, and A.H. Harvey, 1986, Relative Permeability of
Petroleum Reservoirs: Boca Raton, Fla., CRC Press, 143 p.

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Dunn, T.L. Anisotropy and spatial variation of relative permeability and lithologic character of Tensleep Sandstone reservoirs in the Bighorn and Wind River basins, Wyoming. Quarterly report, January 1, 1996--March 31, 1996, report, April 26, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc672505/m1/4/ocr/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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