Temperature Monitoring Results for Gas Hydrate Borehole DK-9 and Thickness of Gas Hydrate Stability Zone in the Qilian Mountains Permafrost

Abstract

Abstract:

Gas hydrate was discovered in 2008 in the Sanlutian coalfield, Qilian Mountain permafrost, Northwest China. This discovery was first successfully sampled by drilling in mid-low-latitudes mountain permafrost, and was a breakthrough in gas hydrate exploration in onshore regions of China. Temperature monitoring for gas hydrate scientific borehole DK-9, one of boreholes in the Sanlutian coalfield in which gas hydrate was discovered, yielded steady ground temperature data for both in and beneath permafrost layer for one year. The results suggest that the thickness of permafrost in the Sanlutian coalfield is about 160 m and that the geothermal gradient is 1.38 ℃/100 m in the permafrost layer and 4.85 ℃/100 m below the permafrost layer. Analysis of the gas hydrate stability conditions indicate that the permafrost conditions and gas components are favorable for gas hydrate formation, and the maximum depth of the gas hydrate stability zone(GHSZ)in the Sanlutian coalfield is 510-617 m.

Key words: gas hydrate, geothermal gradient, gas hydrate stability zone, Qilian Mountain

CLC Number:

WANG Chaoqun, DING Yingying, HU Daogong, QI Bangshen, ZHANG Yaoling, TAO Tao, WU Huanhuan. Temperature Monitoring Results for Gas Hydrate Borehole DK-9 and Thickness of Gas Hydrate Stability Zone in the Qilian Mountains Permafrost[J]. Geoscience, 2017, 31(01): 158-166.

Figures/Tables 7

References 62

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传感器	深度 /m	月均温 /℃												年均温/℃
传感器	深度 /m	1月	2月	3月	4月	5月	6月	7月	8月	9月	10月	11月	12月	年均温/℃
1	0.5	-14.92	-13.72	-8.38	-2.82	-0.80	0.66	4.80	7.98	3.96	-0.74	-3.79	-11.20	-3.30
2	0.7	-13.44	-13.11	-8.68	-3.59	-1.55	-0.77	3.23	5.00	2.10	-0.65	-2.51	-9.26	-3.36
3	3.3	-4.24	-6.91	-6.99	-5.05	-3.40	-2.36	-1.53	-1.11	-0.61	-0.64	-0.70	-0.67	-2.76
4	5.3	-1.42	-3.38	-4.59	-4.27	-3.47	-2.98	-1.89	-1.46	-1.17	-0.97	-0.85	-0.74	-2.21
5	10.3	-1.15	-1.26	-1.67	-2.08	-2.26	-2.33	-2.18	-1.98	-1.77	-1.61	-1.44	-1.27	-1.75
6	10.7	-1.11	-1.19	-1.54	-1.92	-2.12	-2.20	-2.11	-1.93	-1.74	-1.56	-1.40	-1.24	-1.67
7	30.3	-1.42	-1.45	-1.49	-1.51	-1.52	-1.53	-1.54	-1.55	-1.54	-1.52	-1.50	-1.45	-1.50
8	40.7	-1.47	-1.50	-1.53	-1.56	-1.56	-1.56	-1.59	-1.59	-1.58	-1.56	-1.54	-1.50	-1.55
9	50.7	-1.28	-1.30	-1.34	-1.36	-1.37	-1.38	-1.40	-1.41	-1.40	-1.38	-1.35	-1.31	-1.36
10	60.7	-1.58	-1.60	-1.65	-1.67	-1.68	-1.69	-1.71	-1.72	-1.71	-1.68	-1.65	-1.61	-1.66
11	70.7	-1.33	-1.36	-1.40	-1.42	-1.41	-1.41	-1.44	-1.45	-1.45	-1.42	-1.40	-1.36	-1.41
12	80.7	-1.22	-1.25	-1.29	-1.22	-1.19	-1.24	-1.31	-1.33	-1.32	-1.31	-1.29	-1.25	-1.27
13	90.7	-0.51	-0.53	-0.57	-0.56	-0.54	-0.55	-0.58	-0.60	-0.59	-0.58	-0.56	-0.53	-0.56
14	110.0	-0.53	-0.56	-0.60	-0.62	-0.61	-0.62	-0.64	-0.65	-0.64	-0.62	-0.60	-0.56	-0.61
15	210.0	2.85	2.83	2.78	2.74	2.74	2.73	2.71	2.71	2.72	2.74	2.77	2.82	2.76
16	310.0	-	-	-	6.12	6.11	6.11	6.10	-	-	-	-	-	6.11
17	410.0	12.55	12.52	12.46	12.43	12.44	12.44	12.42	12.40	12.41	12.44	12.46	12.52	12.46

传感器	深度 /m	月均温 /℃												年均温/℃
传感器	深度 /m	1月	2月	3月	4月	5月	6月	7月	8月	9月	10月	11月	12月	年均温/℃
1	0.5	-14.92	-13.72	-8.38	-2.82	-0.80	0.66	4.80	7.98	3.96	-0.74	-3.79	-11.20	-3.30
2	0.7	-13.44	-13.11	-8.68	-3.59	-1.55	-0.77	3.23	5.00	2.10	-0.65	-2.51	-9.26	-3.36
3	3.3	-4.24	-6.91	-6.99	-5.05	-3.40	-2.36	-1.53	-1.11	-0.61	-0.64	-0.70	-0.67	-2.76
4	5.3	-1.42	-3.38	-4.59	-4.27	-3.47	-2.98	-1.89	-1.46	-1.17	-0.97	-0.85	-0.74	-2.21
5	10.3	-1.15	-1.26	-1.67	-2.08	-2.26	-2.33	-2.18	-1.98	-1.77	-1.61	-1.44	-1.27	-1.75
6	10.7	-1.11	-1.19	-1.54	-1.92	-2.12	-2.20	-2.11	-1.93	-1.74	-1.56	-1.40	-1.24	-1.67
7	30.3	-1.42	-1.45	-1.49	-1.51	-1.52	-1.53	-1.54	-1.55	-1.54	-1.52	-1.50	-1.45	-1.50
8	40.7	-1.47	-1.50	-1.53	-1.56	-1.56	-1.56	-1.59	-1.59	-1.58	-1.56	-1.54	-1.50	-1.55
9	50.7	-1.28	-1.30	-1.34	-1.36	-1.37	-1.38	-1.40	-1.41	-1.40	-1.38	-1.35	-1.31	-1.36
10	60.7	-1.58	-1.60	-1.65	-1.67	-1.68	-1.69	-1.71	-1.72	-1.71	-1.68	-1.65	-1.61	-1.66
11	70.7	-1.33	-1.36	-1.40	-1.42	-1.41	-1.41	-1.44	-1.45	-1.45	-1.42	-1.40	-1.36	-1.41
12	80.7	-1.22	-1.25	-1.29	-1.22	-1.19	-1.24	-1.31	-1.33	-1.32	-1.31	-1.29	-1.25	-1.27
13	90.7	-0.51	-0.53	-0.57	-0.56	-0.54	-0.55	-0.58	-0.60	-0.59	-0.58	-0.56	-0.53	-0.56
14	110.0	-0.53	-0.56	-0.60	-0.62	-0.61	-0.62	-0.64	-0.65	-0.64	-0.62	-0.60	-0.56	-0.61
15	210.0	2.85	2.83	2.78	2.74	2.74	2.73	2.71	2.71	2.72	2.74	2.77	2.82	2.76
16	310.0	-	-	-	6.12	6.11	6.11	6.10	-	-	-	-	-	6.11
17	410.0	12.55	12.52	12.46	12.43	12.44	12.44	12.42	12.40	12.41	12.44	12.46	12.52	12.46