FIELD: oil and gas field geology. SUBSTANCE: before opening an efficient seam through a well a salt indicator is added to the drilling solution. On opening the seam the drilling solution filtrate is analyzed on composition and indicator concentration. The water portion of the probe obtained from the seam at testing is analyzed on salt composition and indicator concentration. The results are used to compute the composition of residual water. EFFECT: increased reliability of method. 1 tbl
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