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Table 9 Results of X-ray analysis of dirty formations

From: Effect of barite and gas oil drilling fluid additives on the reservoir rock characteristics

Well no. Ru.197 R.181
Sample no. 6 7 8 9 10 11 12
Depth (m) 3201 3216 3229 3247 3205 3225 3240
Mineral type
 Quartz 71.16 77.82 73.28 74.32 92.8 94 95.7
 Calcite 12.73 6.22 4.4 4.41
 Feldspar 10.48 6.63 5.11 6.4 1.43 0.85 1.17
Clay minerals
 Kaolinite 2.67 2.94 7.82 6.11 1.17 1.05 0.43
 Illite 1.83 3.28 4.30 3.96 1.36 0.7 Trace
 Montmorillonite 1.13 3.11 5.09 4.8 3.24 3.44 2.7
 Total 100.0 100.0 100.0 100.0 100.0 100.0 100.0