Table 4 D grey relational degree for well JY6-2.

From: A comprehensive logging evaluation method for identifying high-quality shale gas reservoirs based on multifractal spectra analysis

Fracturing section

Gas production contribution rate

Fractal spectral width D

D Grey relational degree

AC

CNL

DEN

GR

AC

CNL

DEN

GR

10

0.507

1.441

1.648

1.445

1.587

0.8295

0.8813

0.8747

0.9163

11

0.6

1.498

1.567

1.575

1.596

12

0.856

1.359

1.617

1.456

1.547

13

0.859

1.436

1.531

1.536

1.547

14

0.939

1.545

1.722

1.678

1.623

15

2.239

1.399

1.595

1.547

1.498