Pore Structure Characteristics, Genesis, and Its Controlling Effect on Gas Migration of Quaternary Mudstone Reservoir in Qaidam Basin

Table 1

TOC and mineral content of Quaternary mudstone samples.

Sample number	Depth (m)	TOC; (%)	Clay; (%)	Quartz; (%)	Feldspar; (%)	Carbonate; (%)	Pyrite; (%)	Lithology
H-1	1592.5	0.12	37.06	25.74	16.62	20.16	0.30	Pure mudstone
H-2	1596.4	0.15	35.56	30.60	14.08	19.01	0.60	Pure mudstone
H-3	1597.0	0.18	34.80	27.47	15.94	20.11	1.50	Pure mudstone
H-4	1589.3	0.23	22.10	37.04	20.60	19.43	0.60	Silty mudstone
H-5	1596.8	0.12	29.80	42.08	13.80	13.92	0.28	Silty mudstone
H-6	1852.0	0.17	28.89	37.62	19.47	11.95	1.90	Silty mudstone
H-7	1850.8	0.11	13.29	62.53	20.20	2.57	1.30	Sandy mudstone
H-8	1856.5	0.09	17.00	53.87	19.92	7.41	1.71	Sandy mudstone
H-9	1594.8	0.12	21.78	38.10	19.35	19.57	1.08	Silty mudstone
H-10	1595.0	0.16	26.31	29.83	20.92	22.13	0.65	Silty mudstone
H-11	1596.3	0.21	30.48	28.32	15.84	23.59	1.56	Pure mudstone
H-12	1596.5	0.08	32.80	27.50	16.71	21.49	1.42	Pure mudstone
H-13	1856.6	0.13	16.44	54.68	18.16	8.59	2.00	Sandy mudstone
H-14	1598.9	0.11	28.04	33.58	17.19	19.76	1.32	Silty mudstone
H-15	1599.3	0.15	28.93	38.31	18.77	11.98	1.86	Silty mudstone
H-16	1592.3	0.13	37.18	26.72	17.45	18.11	0.41	Pure mudstone
H-17	1851.0	0.21	35.61	30.49	14.16	19.07	0.46	Pure mudstone
H-18	1588.9	0.07	36.22	28.15	16.31	17.93	1.32	Pure mudstone
H-19	1589.2	0.16	24.30	33.10	22.53	19.29	0.62	Silty mudstone
H-20	1596.1	0.14	38.42	31.12	13.60	16.08	0.64	Pure mudstone
H-21	1599.2	0.12	26.76	38.72	19.79	12.93	1.68	Silty mudstone
H-22	1856.8	0.06	15.66	55.34	20.61	7.45	0.88	Sandy mudstone
H-23	1603.9	0.14	24.59	30.59	20.18	23.63	0.87	Silty mudstone
H-24	1851.7	0.07	14.64	51.45	23.73	9.68	0.43	Sandy mudstone
H-25	1590.1	0.09	26.86	35.70	16.33	19.96	1.06	Silty mudstone
H-26	1604.5	0.09	17.22	53.84	19.67	7.39	1.79	Sandy mudstone
H-27	1853.1	0.23	34.69	25.36	17.49	20.92	1.31	Pure mudstone
H-28	1604.6	0.06	13.95	56.48	20.84	7.22	1.45	Sandy mudstone
H-29	1605.0	0.10	19.44	51.59	18.43	9.41	1.03	Sandy mudstone
H-30	1855.5	0.13	27.95	34.61	22.67	12.54	2.10	Silty mudstone