A New Experimental Approach for Hydraulic Fracturing Fluid Damage of Ultradeep Tight Gas Formation

Table 4

XRD results of the tested tight core samples.

Sample no.	Quartz (%)	Feldspar (%)	Calcite (%)	Dolomite (%)	Anhydrite (%)	Clay (%)
1	59.2	25.4	0.3	7.8	0.0	7.3
2	60.9	23.7	0.0	7.8	0.8	6.8
3	49.6	34.8	0.3	7.1	1.9	6.3
4	53.7	30.3	0.0	8.5	0.0	7.5
5	52.3	32.6	0.0	8.3	0.0	6.8
6	47.0	34.1	0.0	9.4	0.7	8.8
7	50.7	27.7	0.0	9.0	4.9	7.7
8	51.7	27.1	0.0	8.3	5.0	7.9
9	57.0	25.8	0.0	8.4	1.2	7.6
10	48.0	32.7	0.0	9.5	0.9	8.9
11	53.2	30.5	0.0	8.9	0.0	7.4
12	54.8	28.3	0.0	8.0	1.3	7.6
13	51.9	29.4	0.0	9.4	0.9	8.4
14	54.5	28.4	0.0	8.5	0.0	8.6
15	52.2	27.7	0.0	8.5	3.4	8.2
16	54.4	28.8	0.0	8.2	0.0	8.6
17	54.3	29.7	0.0	8.6	0.0	7.4
18	47.7	34.0	0.0	10.6	0.0	7.7
19	53.0	30.6	0.0	8.1	0.0	8.3
20	41.4	38.7	0.0	10.2	1.9	7.8