Investigation on Nonuniform Extension of Hydraulic Fracture in Shale Gas Formation

Table 1

Comparison of the main reservoir geological parameters in Changning and North America shale area.

Shale area	Depth (m)	Total organic carbon (%)	Porosity (%)	Brittle mineral (%)	Pressure coefficient	Horizontal stress difference (MPa)
Changning	2000~4500	2.5~4.8	3.4~7.9	50~80	1.2~2.1	9~20
Haynesville	3000~4700	2.0~7.0	5.0~11.0	65~75	1.6~2.1	3~6
Eagle Ford	1300~3600	2.0~6.5	3.4~14.6	67~87	1.3~2.0	/
Duvernay	3000~4200	2.0~6.0	3.0~6.0	﹥40	1.8~2.1	/