Assessment of true formation resistivity and water saturation in deeply invaded tight-gas sandstones based on the combined numerical simulation of mud-filtrate …
G Merletti, S Al Hajri, M Rabinovich, R Farmer… - … -The SPWLA Journal …, 2023 - onepetro.org
The process of mud-filtrate invasion involves immiscible fluid displacement and salt mixing
between mud filtrate and formation fluids in porous and permeable rocks. Consequently, the
post-invasion spatial distribution of fluids and electrolyte concentration around the borehole
affects resistivity measurements with different depths of investigation (DOI). In the presence
of deep mud-filtrate invasion, the assessment of water saturation in the uninvaded zone
based on the deep resistivity log can be inaccurate. Deep and electrically conductive filtrate …
between mud filtrate and formation fluids in porous and permeable rocks. Consequently, the
post-invasion spatial distribution of fluids and electrolyte concentration around the borehole
affects resistivity measurements with different depths of investigation (DOI). In the presence
of deep mud-filtrate invasion, the assessment of water saturation in the uninvaded zone
based on the deep resistivity log can be inaccurate. Deep and electrically conductive filtrate …
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