Table 3 SOM results of star-plot facies mapping showing the mean values of each log type along with associated cluster/facies no.

From: Reservoir rock typing assessment in a coal-tight sand based heterogeneous geological formation through advanced AI methods

Cluster/facies no

No. of data values

GR (API)

DEN (g/cm3)

CNL (dec)

AC (us/ft)

log (ILD)

Lithofacies Interpretation

Mean

Mean

Mean

Mean

Mean

Facies 1

677

53.791

2.6874

0.06766

50.653

2.5763

Tight gas

Facies 3

300

143.16

1.9344

0.56231

96.742

2.4601

Coal

Facies 3

1440

89.939

2.5141

0.20909

70.83

1.4985

Shale intercalations