A New Evaluation Method for the Fracability of a Shale Reservoir Based on the Structural Properties

Table 3

Comparison of the four methods for calculating RQD by various researchers for XK-2 drilling cores.

Roundtrip	RQD Deere	RQD Pal (1982)	RQD Pal (2005)	RQDc	MRQD	RQDI
100	90.5	99.6	98.33	6.38	88.67	88.67
101	90.67	98.5	97.5	6.08	89.83	89.83
102	95.17	87.5	89.17	3.88	87.5	87.5
103	70.0	95.2	95	4.35	73.67	73.67
104	73.68	95.2	95	4.52	76.83	76.83
105	75.5	95.2	95	4.81	82.33	80.33
106	19.83	100	100	3.40	29.5	29.5
107	65.67	100	99.17	5.71	73.5	72.17
108	72.83	99.6	98.33	5.21	71.17	69.83
109	94.33	99.6	98.33	6.64	92.67	92.67
110	71.83	100	99.17	6.19	80.17	80.17
111	39.5	100	100	4.59	45.5	45.5
112	40.5	100	100	6.92	39.0	39
113	39.17	99.6	98.33	3.52	45.83	41.33
114	76	85.3	87.5	3.56	86.17	86.17
115	62.5	84.2	86.67	3.16	77.17	77.17
116	73	85.3	87.5	3.58	86.5	86.5
117	47.67	86.4	88.33	2.74	61	61
118	68.5	85.3	87.5	3.33	79.83	80.33
119	77.33	94.1	94.17	4.59	82.33	82.33
120	67.83	95.2	95	4.56	77.67	77.67
121	86.33	97.4	96.67	5.81	90.83	90.83
122	90.33	99.6	98.33	6.56	91.33	91.33
123	62.83	100	100	6.59	67.5	67.5
124	76.33	94.1	94.17	4.56	81.67	81.67
125	57.33	100	100	5.51	60.67	60.67
126	83.67	100	99.17	6.60	85.83	85.83
127	63.83	97.4	96.67	4.29	65	65.33
128	84.67	100	100	9.41	80.67	80.67
129	84.67	100	100	7.15	87	87
130	79.67	100	100	6.77	82	82
131	70.5	100	100	8.28	70.5	70.5
132	58.33	100	99.17	4.70	59.33	59.33
133	79.33	96.3	95.83	5.00	81.5	81.5
134	70.17	99.6	98.33	5.29	72.33	72.33