The Exquisite Comparison of Shale Mineralogical-Geochemical Characteristics between Chang 7 Member and Chang 9 Member in Yanchang Formation, Ordos Basin

Table 4

Vitrinite reflectance values of 70 Yanchang shale samples.

Number	Depth (m)	Member/SM	Vitrinite reflectance values (Ro %)	Measuring points	Standard deviation	Number	Depth (m)	Member/SM	Vitrinite reflectance values (Ro %)	Measuring points	Standard deviation
1	1450.2	C7-2SM	0.923	20	0.135	36	1449.49	C7-2SM	0.978	20	0.139
2	1451.1	C7-2SM	0.923	11	0.121	37	1612.18	C7-2SM	0.958	22	0.132
3	1452.07	C7-2SM	0.926	24	0.144	38	1613.94	C7-2SM	0.975	22	0.15
4	1453.4	C7-2SM	0.92	25	0.112	39	1618.15	C7-2SM	0.969	21	0.091
5	1454.42	C7-2SM	0.93	24	0.097	40	1622.17	C7-2SM	0.979	15	0.176
6	1456.6	C7-2SM	0.924	21	0.142	41	1605.33	C7-3SM	0.855	31	0.131
7	1458.51	C7-2SM	0.923	20	0.083	42	1607.3	C7-3SM	0.853	29	0.118
8	1139.1	C7-2SM	0.835	19	0.088	43	1609.7	C7-3SM	0.857	31	0.128
9	1142.09	C7-2SM	0.839	17	0.09	44	1611.45	C7-3SM	0.864	29	0.127
10	1146.16	C7-2SM	0.84	25	0.118	45	1613.59	C7-3SM	0.883	25	0.107
11	1150.25	C7-2SM	0.845	24	0.094	46	1616.75	C7-3SM	0.827	21	0.134
12	1153.35	C7-2SM	0.843	22	0.086	47	1622.8	C7-3SM	0.911	24	0.147
13	1156.45	C7-2SM	0.848	12	0.127	48	1388.97	C7-3SM	0.843	24	0.145
14	1442.45	C7-2SM	0.915	25	0.093	49	1391.3	C7-3SM	0.87	3	0.108
15	1445.46	C7-2SM	0.913	15	0.102	50	1393.25	C7-3SM	0.879	13	0.169
16	1447.78	C7-2SM	0.924	20	0.085	51	1396.37	C7-3SM	0.883	16	0.084
17	1451.04	C7-2SM	0.931	28	0.107	52	1397.56	C7-3SM	0.891	18	0.142
18	1511.17	C7-2SM	1.012	12	0.103	53	1400.73	C7-3SM	0.914	9	0.116
19	1515.92	C7-2SM	1.018	25	0.111	54	1603.35	C9M	1.066	14	0.081
20	1519.55	C7-2SM	1.019	25	0.145	55	1604.42	C9M	1.063	19	0.139
21	1195.29	C7-2SM	0.854	13	0.076	56	1603.73	C9M	1.042	23	0.096
22	1202.54	C7-2SM	0.855	16	0.135	57	1599.05	C9M	1.074	17	0.134
23	1206.44	C7-2SM	0.86	32	0.145	58	1603.12	C9M	1.094	16	0.114
24	1212.53	C7-2SM	0.864	20	0.085	59	1597.2	C9M	1.046	10	0.107
25	1609.95	C7-2SM	0.943	16	0.142	60	1602.1	C9M	1.062	15	0.093
26	1616.18	C7-2SM	0.955	15	0.081	61	1604.98	C9M	1.062	15	0.093
27	1620.1	C7-2SM	0.96	22	0.086	62	1663.39	C9M	1.09	20	0.097
28	1624.29	C7-2SM	0.976	13	0.11	63	1668.27	C9M	1.095	13	0.104
29	1450.74	C7-2SM	0.941	17	0.093	64	1671.89	C9M	1.102	25	0.174
30	1452.78	C7-2SM	0.965	18	0.065	65	1361.15	C9M	0.889	10	0.095
31	1455.5	C7-2SM	0.969	21	0.088	66	1748.3	C9M	0.984	13	0.081
32	1457.56	C7-2SM	0.971	17	0.081	67	1752.4	C9M	1.012	25	0.157
33	1441.9	C7-2SM	0.949	10	0.091	68	1756.33	C9M	1.016	22	0.146
34	1443.77	C7-2SM	0.976	10	0.073	69	1750.3	C9M	1.094	28	0.107
35	1446.7	C7-2SM	0.972	21	0.126	70	1754.43	C9M	1.097	3	0.27