Anisotropy and Energy Evolution Characteristics of Shales: A Case Study of the Longmaxi Formation in Southern Sichuan Basin, China

Table 2

Shale gas well-drilling data.

No.	Parameter	Value
2	Depth (m)	3198.5
2	Vertical in situ stress (MPa)	81.7
3	Maximum horizontal in situ stress (MPa)	93.2
4	Minimum horizontal in situ stress (MPa)	78.5
5	Pore pressure (MPa)	57.57
6	Biot coefficient	0.71
7	Cohesion (MPa)	8.67
8	Internal friction angle (°)	40.69
9	Cohesion of weak plane (MPa)	5.42
10	Internal friction angle of weak plane (°)	38.23