Table 4 Exponential models of permeability evaluation for different HFUs in the Xin488 well.

From: An improved method for predicting the permeability of Chang 7 shale oil reservoirs based on lithology and hydraulic flow units

Hydraulic flow unit

Permeability evaluation model

HFU I

K = 0.0037e0.541φ

HFU II

K = 0.0007e0.6805φ

HFU III

K = 0.0017e0.4107φ

HFU IV

K = 0.0009e0.3818φ

HFU V

K = 0.0001e0.5112φ

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