Assessment of Chemical Effects on Wellbore Stability in Transition Shale Formation

Table 2

Clay minerals relative content.

Sample	Clay mineral content (%)				Interstratified ratio (%S)
	S	I/S	I	Kao
1	—	71	18	4	15
2	—	71	17	—	15
3	—	61	39	—	15
4	—	72	17	4	20
5	—	78	15	3	20
6	—	81	12	3	20