Determination of the Hydration Damage Instability Period in a Shale Borehole Wall and Its Application to a Fuling Shale Gas Reservoir in China

Table 1

Mineral components of shale samples.

Minerals		Quartz	Feldspar	Calcite	Dolomite	Siderite	Pyrite	Mixed-layer illite/smectite	Chlorite	Kaolinite
Mineral content (%)	I	31.7	4.9	2.3	3.6	2.6	3.1	38.8	9.3	3.4
	II	30.6	6.7	0	0.7	1.2	4.8	44.6	7.2	3.6
	III	30.3	5.5	1.9	3.6	1.4	2.2	40.5	11.8	2.5