页岩油原地量和可动油量评价方法与应用

doi:10.11743/ogg20210619

摘要/Abstract

摘要：

页岩总油含量（TOY）和可动油含量（MOY）的计算是页岩油资源潜力评价的核心技术。根据对两次热解样品总有机碳含量（TOC）非均质性的认识，提出了一种基于两次热解数据来评价样品TOC含量非均质性的方法及一种校正吸附油含量的计算方法，并运用该方法对江汉盆地29个潜江组页岩样品和渤海湾盆地32个沙河街组页岩样品进行评价，结果显示：①TOC含量偏差平均值分别达到0.16%和0.34%，说明两组样品都存在一定的非均质性；②校正前、后吸附油含量的差值分别为0.85 mg/g和0.84 mg/g，说明进行等价TOC校正可以使吸附油含量、总油含量和可动油含量的计算结果更准确。同时，提出了一种基于页岩油密度及地层体积系数计算蒸发烃损失量的方法。采用以上新方法对鄂尔多斯盆地延长组7油层组（长7油层组）页岩油进行评价，结果显示：①吸附油含量占总油含量的63%，可动油含量占总油含量的37%，总油含量是游离烃量（S₁）的3.5倍，蒸发烃损失量约占总烃含量的9%，占S₁含量的29%；②长7油层组页岩油原地量为111.2×10⁸ t，可动油量为40.1×10⁸ t，说明长7油层组页岩油勘探潜力大。

关键词: 资源潜力, 总油含量, 可动油含量, 页岩油, 延长组, 鄂尔多斯盆地

Abstract:

The calculation of total oil yield (TOY) and movable oil yield (MOY) of shale is a core technology in assessing shale oil resource potential. A method of evaluating the heterogeneity of TOC content in shale samples and a calculation method to correct the content of adsorbed oil are proposed based on data of two separate pyrolysis experiments. The calculation method is subsequently applied to evaluate 29 shale samples from the Qianjiang Formation in the Jianghan Basin and 32 shale samples from the Shahejie Formation in the Bohai Bay Basin, and the results show that: (1) The mean deviations of TOC are 0.16% and 0.34%, respectively, indicating heterogeneity of the two sample groups; (2) The adsorbed oil content deviations of pre-and post-correction are 0.85 mg/g and 0.84 mg/g respectively, showing that the equivalent TOC correction can lead to more accurate results in calculating adsorbed oil, TOY and MOY. Besides, a method to calculate evaporative hydrocarbon loss is proposed based on shale oil density and formation oil volume factor. These newly proposed methods are used to evaluate the 7^th shale oil layer group of Yanchang Formation (Chang 7 shale oil layer group) in the Ordos Basin. The results are as follows: (1) Adsorbed oil accounts for 63% of the TOY, the MOY accounts for 37% of the TOY, the TOY is 3.5 times of S₁, and the evaporative hydrocarbon loss accounts for 9% of the TOY and 29% of S₁; (2) The shale oil in-place is 111.2×10⁸t and the movable oil in-place is 40.1×10⁸t in the study area, indicating that the Chang 7 shale oil layer group is of great exploration potential.

Key words: resource potential, total oil yield (TOY), movable oil yield (MOY), shale oil, Yanchang Formation, Ordos Basin

中图分类号:

TE122.1

郭秋麟,王建,陈晓明,等. 页岩油原地量和可动油量评价方法与应用[J]. 石油与天然气地质, 2021, 42(6): 1451-1463. doi: 10.11743/ogg20210619 Qiulin Guo,Jian Wang,Xiaoming Chen,et al. Discussion on evaluation method of total oil and movable oil in-place[J]. Oil & Gas Geology, 2021, 42(6): 1451-1463. doi: 10.11743/ogg20210619

图/表 11

图1

表1

江汉盆地潜江组页岩热解数据、吸附油含量及校正系数（热解数据来自文献[26]）"

样品编号	井名	深度/ m	全岩热解数据			抽提后的全岩热解数据			未校正的		等价TOC校正后的
样品编号	井名	深度/ m	S₁/（mg·g^-1）	S₂/（mg·g^-1）	TOC_A/%	S_1EX/（mg·g^-1）	S_2EX/（mg·g^-1）	TOC_EX/%	（S₁- S_1EX）/ （mg·g^-1）	（S₂- S_2EX）/ （mg·g^-1）	ΔS_2eq/（mg·g^-1）	k_eq	TOC_B/%	\|TOC_A-TOC_B\|/%	\|ΔS_2eq-ΔS₂\|/ （mg·g^-1）
1	Wangyun-11	1 746.1	2.99	14.48	2.59	0.04	11.30	2.03	2.95	3.18	2.67	1.05	2.48	0.11	0.51
2	Wangyun-11	1 747.0	4.60	25.60	4.48	0.06	22.62	3.80	4.54	2.98	2.35	1.03	4.43	0.05	0.63
3	Wangyun-11	1 749.3	20.86	17.14	4.48	0.06	3.59	1.44	20.80	13.55	12.99	1.16	4.30	0.18	0.56
4	Wangyun-11	1 714.3	3.05	2.10	0.94	0.01	0.69	0.65	3.04	1.41	1.50	0.86	1.02	0.08	0.09
5	Wangyun-11	1 710.6	9.09	9.78	3.68	0.03	4.77	2.33	9.06	5.01	4.57	1.09	3.50	0.18	0.44
6	Wangyun-11	1 707.3	10.97	7.61	2.98	0.01	1.95	1.25	10.96	5.66	5.04	1.32	2.64	0.35	0.62
7	Wangyun-11	1 705.9	9.92	8.17	3.40	0.03	2.80	2.01	9.89	5.37	5.18	1.07	3.28	0.12	0.19
8	Wangyun-11	1 704.7	2.02	1.47	0.62	0.01	0.44	0.26	2.01	1.03	0.82	1.48	0.51	0.11	0.21
9	Wangyun-11	1 649.2	4.50	55.96	8.54	0.15	50.82	7.52	4.35	5.14	1.58	1.07	8.31	0.23	3.56
10	Wangyun-11	1 646.5	17.09	16.70	4.63	0.04	3.99	1.93	17.05	12.71	12.16	1.14	4.41	0.22	0.55
11	Wangyun-11	1 645.1	8.81	12.61	3.02	0.03	5.72	1.48	8.78	6.89	5.55	1.23	2.79	0.23	1.34
12	Wangyun-11	1 633.0	4.65	31.39	5.33	0.10	26.13	4.48	4.55	5.26	4.89	1.01	5.30	0.03	0.37
13	Wangyun-11	1 632.3	8.82	57.62	9.71	0.26	49.11	8.14	8.56	8.51	6.71	1.04	9.56	0.15	1.80
14	Wangyun-11	1 309.3	5.57	46.03	6.03	0.28	36.94	4.92	5.29	9.09	10.88	0.95	6.12	0.09	1.79
15	Qianyeping-2	1 451.6	0.73	3.80	0.98	0.04	2.98	0.90	0.69	0.82	1.03	0.93	1.03	0.05	0.21
16	Qianyeping-2	1 463.5	3.67	33.15	5.58	0.21	27.54	4.75	3.46	5.61	4.77	1.03	5.51	0.07	0.84
17	Qianyeping-2	1 467.8	3.49	17.57	4.35	0.11	13.30	3.57	3.38	4.27	3.50	1.06	4.21	0.14	0.77
18	Qianyeping-2	1 471.1	1.53	10.98	2.72	0.10	8.17	2.19	1.43	2.81	1.85	1.12	2.54	0.18	0.96
19	Qianyeping-2	1 476.5	3.01	31.11	5.00	0.15	24.76	4.21	2.86	6.35	6.09	1.01	4.98	0.02	0.26
20	Qianyeping-2	1 481.9	0.80	6.50	1.47	0.07	4.61	1.20	0.73	1.89	1.60	1.06	1.42	0.05	0.29
21	Qianyeping-2	1 485.7	1.68	7.58	2.11	0.12	4.86	1.72	1.56	2.72	2.60	1.03	2.08	0.03	0.12
22	Qianyeping-2	1 492.2	3.76	24.63	3.89	0.17	21.87	3.29	3.59	2.76	1.69	1.05	3.82	0.07	1.07
23	Qianyeping-2	1 500.3	1.82	23.90	4.34	0.15	21.73	3.99	1.67	2.17	1.87	1.01	4.31	0.03	0.30
24	Qianyeping-2	1 507.1	0.35	2.37	0.90	0.03	1.65	0.88	0.32	0.72	0.87	0.91	0.97	0.07	0.15
25	Qianyeping-2	1 513.2	3.25	12.56	3.45	0.07	4.08	1.94	3.18	8.48	7.10	1.34	2.91	0.54	1.38
26	Qianyeping-2	1 518.8	1.91	6.89	2.60	0.05	3.49	2.05	1.86	3.40	3.18	1.06	2.49	0.11	0.22
27	Qianyeping-2	1 528.7	4.67	10.20	2.86	0.08	4.33	1.70	4.59	5.87	4.93	1.22	2.57	0.29	0.94
28	Qianyeping-2	1 535.2	10.95	34.75	6.85	0.20	23.45	4.85	10.75	11.30	9.98	1.06	6.69	0.16	1.32
29	Qianyeping-2	1 537.2	8.07	17.72	3.51	0.12	9.10	2.85	7.95	8.62	11.77	0.65	4.23	0.72	3.15
	平均值	—	—	—	3.83	—	—	—	—	5.30	4.82	1.07	3.74	0.16	0.85

表1

表2

渤海湾盆地沙河街组页岩热解数据、吸附油含量及校正系数（热解数据来自文献[16]）"

			全岩热解数据			抽提后的全岩热解数据			未校正的		等价TOC含量校正后的
样品编号	井名	深度/m	S₁/（mg·g^-1）	S₂/（mg·g^-1）	TOC_A/%	S_1EX/（mg·g^-1）	S_2EX/（mg·g^-1）	TOC_EX/%	（S₁- S_1EX）/ （mg·g^-1）	（S₂- S_2EX）/ （mg·g^-1）	ΔS_2eq/（mg·g^-1）	k_eq	TOC_B/%	\|TOC_A-TOC_B\|/%	\|ΔS_2eq-ΔS₂\|/ （mg·g^-1）
1	LY1–18	3 580.17	5.34	11.86	3.58	1.31	8.90	2.83	4.03	2.96	2.21	1.08	3.30	0.28	0.75
2	LY1–17	3 587.18	4.47	7.54	2.43	1.49	6.15	1.87	2.98	1.39	0.41	1.16	2.10	0.33	0.98
3	LY1–16	3 600.10	11.90	18.44	4.97	0.50	8.64	3.13	11.40	9.8	9.53	1.03	4.82	0.15	0.27
4	LY1–15	3 613.38	9.23	12.88	3.63	1.84	7.78	2.53	7.39	5.10	4.83	1.03	3.51	0.12	0.27
5	LY1–14	3 624.31	5.46	8.52	2.70	1.10	5.29	1.91	4.36	3.23	2.63	1.11	2.42	0.28	0.60
6	LY1–13	3 635.56	6.05	12.60	3.93	0.29	6.52	2.54	5.76	6.08	4.75	1.20	3.26	0.67	1.33
7	LY1–12	3 644.95	9.35	18.13	5.15	0.62	10.90	4.01	8.73	7.23	7.91	0.94	5.49	0.34	0.68
8	LY1–11-a	3 659.12	13.76	24.96	6.93	1.60	15.09	4.96	12.16	9.87	9.30	1.04	6.68	0.25	0.57
9	LY1–10	3 671.64	10.01	18.93	5.97	0.66	13.01	4.90	9.35	5.92	6.62	0.95	6.31	0.34	0.70
10	LY1–9	3 690.20	2.64	4.85	1.73	1.15	3.47	1.43	1.49	1.38	1.18	1.06	1.63	0.10	0.20
11	LY1–8	3 748.10	3.42	5.48	2.22	0.50	2.93	1.47	2.92	2.55	1.82	1.25	1.78	0.44	0.73
12	LY1–7	3 757.16	3.02	4.80	1.94	0.38	2.14	1.44	2.64	2.66	2.56	1.05	1.85	0.09	0.10
13	LY1–5	3 786.35	8.43	8.87	3.26	0.41	3.33	1.93	8.02	5.54	5.13	1.12	2.90	0.36	0.41
14	LY1–4	3 797.74	7.29	7.99	3.25	3.41	6.58	2.90	3.88	1.41	1.70	0.96	3.40	0.15	0.29
15	LY1–3	3 812.73	6.35	7.72	2.97	3.85	6.23	2.54	2.50	1.49	1.13	1.06	2.81	0.16	0.36
16	LY1–2	3 817.87	11.52	14.87	5.58	0.71	5.89	3.77	10.81	8.98	8.69	1.05	5.31	0.27	0.29
17	LY1–1	3 822.75	5.27	6.81	2.43	0.23	2.23	1.43	5.04	4.58	4.22	1.16	2.09	0.34	0.36
18	NY1–22	3 307.06	1.98	13.87	2.60	0.69	13.31	2.57	1.29	0.56	1.74	0.91	2.85	0.25	1.18
19	NY1–21	3 314.10	4.95	26.87	4.45	0.67	21.72	3.55	4.28	5.15	3.68	1.07	4.17	0.28	1.47
20	NY1–20	3 351.47	2.58	9.69	2.14	0.29	8.11	1.90	2.29	1.58	2.14	0.93	2.30	0.16	0.56
21	NY1–19	3 360.55	2.35	9.96	2.11	0.23	9.62	1.94	2.12	0.34	0.64	0.97	2.18	0.07	0.30
22	NY1–18	3 374.19	6.04	26.98	4.64	0.48	23.73	4.37	5.56	3.25	7.93	0.80	5.78	1.14	4.68
23	NY1–17	3 380.60	2.25	8.37	1.75	0.25	5.1	1.09	2.00	3.27	1.52	1.34	1.30	0.45	1.75
24	NY1–16	3 398.85	7.48	31.52	4.94	0.39	21.52	3.57	7.09	10.00	10.67	0.97	5.10	0.16	0.67
25	NY1–15	3 401.63	3.50	9.71	1.89	0.26	9.29	1.82	3.24	0.42	2.55	0.77	2.45	0.56	2.13
26	NY1–14	3 404.99	3.47	9.24	1.85	0.75	6.04	1.33	2.72	3.20	2.99	1.03	1.79	0.06	0.21
27	NY1–11	3 434.83	6.31	16.54	5.37	0.53	13.94	5.04	5.78	2.6	3.94	0.90	5.94	0.57	1.34
28	NY1–10	3 439.13	8.31	11.06	2.38	0.37	4.4	0.92	7.94	6.66	4.61	1.47	1.62	0.76	2.05
29	NY1–9	3 468.65	4.49	12.55	3.73	0.35	6.37	2.59	4.14	6.18	5.30	1.14	3.28	0.45	0.88
30	NY1–8	3 471.24	0.20	0.27	0.25	0.01	0.05	0.15	0.19	0.22	0.20	1.45	0.17	0.08	0.02
31	NY1–6	3 478.13	1.58	0.91	1.10	0.03	0.16	0.59	1.55	0.75	0.66	1.55	0.71	0.39	0.09
32	NY1–5	3 483.03	4.19	3.94	2.10	0.22	0.97	1.02	3.97	2.97	2.44	1.54	1.36	0.74	0.53
	平均值	—	—	—	3.25	—	—	—	—	3.98	3.93	1.1	3.15	0.34	0.84

表2

图2

图3

表3

表4

图4

表5

图5

图6

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地层原油				地面原油
密度/（g·cm^-3）	粘度/（mPa·s）	气油比/（m³·t^-1）	体积系数	密度/（g·cm^-3）	粘度（50 ℃）/（mPa·s）	初镏点/ ℃	凝固点/ ℃
0.748	1.48	68.83	1.222	0.839	6.64	74.99	23.17

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