二维核磁共振技术表征页岩所含流体特征的应用——以松辽盆地青山口组富有机质页岩为例

doi:10.11743/ogg20210613

Abstract

Abstract:

Shale may contain a large amount of oil and gas that can be commericially exploited. Clarifying the content and occurrence of different fluids in shale is crucial to the development of shale oil. High frequency (23 MHz) two-dimensional (2D) NMR technology that can be used to quickly, nondestructively and quantitatively measure protium-containing (¹H) fluids in shale is employed to test shale samples (from the Qingshankou Formation in Songliao Basin) before and after extraction as well as during spontaneous imbibition and constant temperature rising experiments. The content and occurrence of different fluids in the samples as well as the loss of fluid from the samples after a period of static settlement are quantified and analyzed. The results show that on the 2D NMR maps, the signals of analogous solid organic matter and movable hydrocarbons, roughly separated by T₂=0.1ms, are mostly distributed in the region above T₁>10 ms. Good linear correlations can be observed between the signals and TOCs or S₁. Oil is either free or absorbed in shale samples from the Qingshankou Formation. Higher clay content means more absorbed oil and less free oil in shale. The 2D NMR spectrum obtained during spontaneous imbibition experiment indicates water swelling of clay minerals. The vacuum heating process of the samples shows both volatilization of light hydrocarbons and significant loss of water. Samples from sealing core drilling combined with 2D NMR can be used effectively in the restoration of the original oil saturation and water saturation.

Key words: two-dimensional NMR, abundance of organic matter, shale, Qingshankou Formation, Songliao Basin

CLC Number:

TE122.1

Longhui Bai, Bo Liu, Yaao Chi, Shichao Li, Xun Wen. 2D NMR studies of fluids in organic-rich shale from the Qingshankou Formation, Songliao Basin[J]. Oil & Gas Geology, 2021, 42(6): 1389-1400.

Figures/Tables 12

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样品编号	深度/ m	TOC/ %	T_max/ ℃	S₁/（mg·g^-1）	S₂/（mg·g^-1）	PI	DCM	矿物组分含量/%
样品编号	深度/ m	TOC/ %	T_max/ ℃	S₁/（mg·g^-1）	S₂/（mg·g^-1）	PI	DCM	石英	长石	方解石	白云石	黄铁矿+ 菱铁矿	粘土
1	1 480.28	2.49	450	1.20	21.10	0.05	0.50	31.0	18.7	0.9	3.6	8.8	37.0
2	1 486.94	2.68	449	1.50	19.20	0.07	0.72	30.2	20.2	1.5	0	10.1	38.0
3	1 492.70	2.40	448	1.20	17.20	0.07	0.63	31.9	16.4	0	0	10.4	41.3
4	1 498.13	2.84	447	2.00	20.60	0.09	0.84	33.6	23.5	1.7	0	8.0	33.2
5	1 506.95	3.49	448	1.50	26.90	0.05	0.66	29.6	18.5	5.8	2.3	9.7	34.1
6	1 510.72	2.27	449	1.00	22.40	0.04	0.47	32.6	17.2	0	0	8.5	41.7
7	1 512.78	3.39	451	1.10	30.10	0.03	0.61	63.9	10.1	0	2.1	2.9	52.6
8	1 524.64	1.81	447	2.20	14.90	0.13	0.88	31.4	10.5	1.3	4.8	21.2	30.9
9	1 527.86	3.41	449	1.80	25.70	0.07	0.77	39.2	10.7	0	0	6.9	43.1
10	2 046.55	4.10	445	4.63	25.28	0.15	—	35.8	9.0	3.4	12.1	2.0	37.7
11	2 055.80	2.56	438	2.56	16.68	0.13	—	32.2	10.1	0	2.0	9.0	46.7

样品编号	抽提前						抽提后
样品编号	样品质量/g	总化合物量/μL	类固体有机质含量/（μL·g^-1）	轻质烃含量/（μL·g^-1）	羟基化合物/（μL·g^-1）	水含量/（μL·g^-1）	样品质量/ g	总化合物量/μL	类固体含量有机质/（μL·g^-1）	轻质烃含量/（μL·g^-1）	羟基化合物含量/（μL·g^-1）	水含量/（μL·g^-1）
1	20.62	863	6.2	1.7	15.3	18.6	19.4	645	4.0	1.6	20.3	7.4
2	20.79	853	5.9	2.3	15.5	17.3	19.9	653	3.3	1.3	24.5	3.7
3	20.68	987	5.0	2.2	22.4	18.1	20.0	696	3.4	1.5	24.9	5.0
4	20.98	730	6.5	3.1	12.5	12.7	20.0	564	1.7	1.3	20.4	4.7
5	20.96	803	7.8	2.4	13.2	14.9	20.0	602	3.1	1.3	23.7	2.2
6	20.86	871	7.4	1.9	18.5	14.1	20.0	780	6.7	1.1	27.8	3.5
7	20.50	1 006	9.1	2.2	23.1	14.7	19.7	814	7.5	2.1	28.3	3.4
8	20.41	869	4.5	3.9	19.1	15.1	19.0	798	1.4	2.2	33.8	4.6
9	20.96	961	7.6	3.3	17.7	17.3	19.5	723	4.3	1.4	27.9	3.4

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2D NMR studies of fluids in organic-rich shale from the Qingshankou Formation, Songliao Basin

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