Geofluids

Research Article

Geochemical Characteristics of Natural Gas and Hydrocarbon Charge History in the Western Qaidam Basin, Northwest China

Table 1

Representative light hydrocarbon geochemical parameters in natural gas from the western Qaidam Basin.


Field	Well	Depth (m)	Strata	n-C₇/MCC₆	Toluene/n-C₇	ΣDMCC₅ (%)	n-C₇ (%)	MCC₆ (%)	2-MC₆/3-MC₆	GTMRH (°C)

Shizigou	S205	3378-3598	E₃²	1.69	0.40	18.0	51.5	30.5	0.74	115.6
Shizigou	S58	5451.18	E₃²	1.23	0.74	20.2	44.0	35.7	0.72	119.5
Huatugou	HN5-43-3	1015	N₁	1.73	0.10	30.4	44.1	25.5	0.83	121.8
Youyuangou	YP3	782.0-783.7	N₂¹	2.72	0.19	13.9	63.0	23.1	1.12	128.5
Gasikule	Y8-371	3481.8-3528.0	E₃²	2.41	0.23	15.9	59.5	24.7	0.86	124.3
Yuejinerhao	YІІ5-13	—	E₃¹	1.13	0.49	40.3	31.7	28.0	0.70	126.4
Yingdong no. 1	Y1-2-B1	966-996.1	N₂²	1.78	0.58	19.3	51.7	29.1	1.18	126.9
	Y1-2-B4	1288.3-1318.1	N₂²	2.66	0.41	17.8	59.7	22.5	1.12	128.4
	Y27-1-A6	1739-1802	N₂²	2.81	0.36	15.7	62.2	22.2	1.41	130.4
	Y38-3-C	1271.5-1342.9	N₂²	2.60	0.53	20.5	57.4	22.1	1.19	127.3
	Y29-1	2838.2-2896.8	N₂¹	2.16	0.62	20.7	54.1	25.1	1.00	124.4
	Y4-2	3018.7-3103.7	N₂¹	2.32	0.36	16.9	58.0	25.0	1.02	127.4
	Y9-4	2081.3-2219.9	N₂¹	2.68	0.39	21.0	57.5	21.5	1.38	132.1
Yingdong no. 3	YD301	2012.2-2023.3	N₂¹	2.14	0.56	20.5	54.2	25.3	1.08	124.2
Yingdong no. 3	YD3-3	2313.3-2491.4	N₂¹	2.22	0.50	20.7	54.6	24.7	1.16	133.3
Wunan	L4-5	2041.6-2305.5	N₂¹	1.89	2.65	16.3	54.7	28.9	1.09	121.4
	W8-11	1361.7-1420.7	N₂¹	1.60	0.77	10.1	55.3	34.5	1.01	130.2
	WB6-19	1631.8-1734	N₂¹	1.37	0.49	18.0	47.4	34.6	0.81	121.3
Zhahaquan	Z11-33-5	—	N₂¹	2.61	0.22	20.1	57.8	22.2	1.11	125.6
	Z11-4-45	—	N₂¹	2.51	0.20	20.6	56.7	22.6	1.11	125.7
	Z11-8-5	2493.0-2494.1	N₂¹	2.04	0.57	19.7	53.9	26.4	1.00	127.2
	Z218	—	N₂¹	2.71	0.39	46.9	38.8	14.3	0.92	129.3
	Z7-1-5	3530.8-3534.7	N₁	2.28	0.29	14.7	59.3	26.0	1.00	129.1
	Z7-2-3	—	N₁	2.28	0.39	15.1	59.0	25.8	1.11	130.1
	Z9-2-1	2432.2-2840.6	N₂¹	1.85	0.51	19.6	52.2	28.2	1.00	125.1
	ZP1	—	N₂¹	1.93	0.37	22.6	51.0	26.5	0.92	128.3
	ZT3	3144-3150	E₃¹	8.77	0.29	5.7	84.6	9.6	1.10	141.7
Kunbei	Q12-H5-11	—	E₃¹	1.78	0.06	47.8	33.5	18.8	1.03	117.7
Nanyishan	N105	2342.3-2346.6	N₂¹	0.75	1.05	19.4	34.6	46.0	0.96	124.2
	N14	4358-4457	E₃²	1.32	1.74	13.3	49.4	37.4	0.84	—
	N2-5	—	E₃²	1.67	0.31	19.5	50.4	30.1	1.06	128.0

; ; . GTMRH: generation temperature of major reservoired hydrocarbons; (Mango [8]).