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Table 7 The petrographical analyses of some core samples

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

Well no. Depth (m) General description
R.99 3211–3212.5 Clean sandstone, medium grained, well sorted, subrounded to rounded, iron oxide (pyrite)
R.99 3188–3189 Sandstone, medium to fine grained, sorted, oil content, iron oxide, little amount of clay
R.99 3179–3180 Sandstone, dominantly medium grained, partly fine and coarse grained, clay materials, pyrite, and oil content
Ru.64 3238–3239 Sandstone, medium grained, well sorted, subrounded to rounded, partly coarse grained, pyrite
Ru.64 3258.5–3259 Sandstone, laminations of sandstone fine, medium, coarse, and very coarse grained
Ru.64 3287–3288 Sandstone, medium grained, sorted, the grains are oriented, compact, algid materials
R.45 3239–3240 Sandstone, medium grained, sorted, calcium carbonate, cemented, secondary porosity, microfractured, little amount of clay
Ru.197 3220–3221 Sandstone, fine grained, well sorted, compact, calcium carbonate, cemented
Ru.197 3212–3213 Sandstone, dominantly medium-grained sandstone, partly fine grained, clay content (kaolinite), oil content, iron oxide
Ru.197 3271.5–3272 Sandstone, fine to medium grained, calcium carbonate, secondary porosity
Ru.181 3287.5–3288.5 Sandstone, medium to coarse grained, porosity full partly by algid materials
Ru.181 3210–3211.5 Sandstone, medium grained, sorted, calcium carbonate, cemented, oil content