Study of impact of clay minerals on rock permeability in varying formation water salinity

About the authors:

Klavdiia A. Spasennikova, Cand. Sci. (Tech.), Senior Researcher, Institute of Earth Cryosphere, Tyumen Scientific Centre of the Siberian Branch of the Russian Academy of Sciences; kspasennikova@gmail.com

Boris V. Grigoriev, Cand. Sci. (Tech.), Associate Professor, Department of Applied and Technical Physics, Institute of Physics and Technology, University of Tyumen; b.v.grigorev@utmn.ru

Alexander A. Shubin, Tyumen State University, Magister

Abstract:

The paper is devoted to the impact assessment of water salinity on the rock permeability coefficient depending on the mineral composition of clay particles. In the experiments the thermodynamic conditions equivalent to the formation ones were created. Varying-salinity water — stratal water (16-20 g/l), 1 g/l was pumped through rock samples; NaCl was used as a dissolved salt. The dependence of the permeability change on the mica, kaolinite, and chlorite contents and separately on the content of mixed-layer minerals is built using the results of X-ray phase analysis. It is found that the mixed-layer minerals similar in properties to smectite group minerals, the main representative of which is montmorillonite, have the greatest impact on the reduction of permeability by changing water salinity of stratal water value (16-20 g/l) at 1 g/l. The most likely reasons for this behavior are: a) the fact of the destruction of the diffuse membranes of bound water by high concentration electrolytes, as a result of which the flow resistance factor by water bound to the surface of mineral particles is reduced or eliminated; b) the swelling of clay minerals in the presence of water, which is primarily typical for the minerals of smectite group.

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