利用核磁共振资料定量评价页岩孔隙结构

doi:10.11938/cjmr20202856

摘要/Abstract

摘要：

页岩气储层的孔隙结构复杂且非均质性较强，导致储层表征及有效性评价面临极大挑战.为了建立页岩气储层孔隙结构的定量评价方法，本文选取了鄂西宜昌地区陡山沱组二段20块岩心，采用0.069 ms的回波间隔开展饱含盐水状态下的核磁共振（NMR）实验.在此基础上，对T₂谱进行了多重分形特征分析，提取了对页岩气储层孔隙结构较敏感的参数，并建立了基于最小与最大广义分维数差值（D_min-D_max）和谱宽（Δα）划分页岩气储层类型的方法及标准.该方法对于有效提高页岩气储层的预测精度、指导开发选层等具有重要意义.

关键词: 页岩气储层, 核磁共振, 孔隙结构, 低回波间隔, 多重分形理论

Abstract:

The pore structure of shale gas reservoir is complex and heterogeneous, leading to great challenges in reservoir characterization and effectiveness evaluation. In order to establish a quantitative evaluation method for pore structure of the shale gas reservoir, 20 cores of the second member of Doushantuo Formation in Yichang area, western Hubei were selected as the experimental sample. An echo interval of 0.069 ms was used to carry out nuclear magnetic resonance (NMR) experiments under 100% salt water saturation. The obtained T₂ spectra were analyzed with the multifractal characteristics method, and the parameters sensitive to the pore structure of the shale reservoirs were extracted. A method and a standard to classify shale reservoir types were developed, based on the minimum and maximum generalized fractal dimension difference (D_min-D_max) and spectral width (Δα). This method is of great significance for improving the prediction accuracy of shale gas reservoirs and guiding development and selection.

Key words: shale gas reservoir, nuclear magnetic resonance (NMR), pore structure, low echo interval, multifractal theory

中图分类号:

P631

孟昆,王胜建,薛宗安,侯瑞卿,肖亮. 利用核磁共振资料定量评价页岩孔隙结构[J]. 波谱学杂志, 2021, 38(2): 215-226.

Kun MENG,Sheng-jian WANG,Zong-an XUE,Rui-qing HOU,Liang XIAO. Quantitative Evaluation of Shale Pore Structure Using Nuclear Magnetic Resonance Data[J]. Chinese Journal of Magnetic Resonance, 2021, 38(2): 215-226.

图/表 10

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编号	岩性	Φ-nmr/%	T₅₀/ms	微孔/%	中孔/%	宏孔/%	D_min^*	D_max^*	D-₁^*	D₁^*	Δα^*	D_min-D_max^*
1#	黑色碳质页岩	2.02	0.598	0.376	48.681	50.942	1.236	0.293	1.097	0.762	1.026	0.943
2#	黑色碳质页岩	1.19	0.604	0.638	48.506	50.856	1.167	0.378	1.072	0.838	0.854	0.789
3#	黑色碳质页岩	0.86	0.257	1.026	65.735	33.239	1.231	0.227	1.111	0.669	1.071	1.004
4#	黑色碳质页岩	2.19	0.542	0.338	51.067	48.595	1.235	0.313	1.100	0.765	1.006	0.923
5#	黑色碳质页岩	2.08	0.769	0.367	44.567	55.065	1.199	0.457	1.066	0.873	0.854	0.742
6#	黑色碳质页岩	1.11	0.327	0.585	61.891	37.524	1.238	0.229	1.115	0.679	1.076	1.009
7#	黑色碳质页岩	1.07	0.378	0.636	58.550	40.814	1.231	0.312	1.095	0.777	0.999	0.919
8#	黑色碳质页岩	1.99	0.307	0.723	62.884	36.393	1.232	0.266	1.106	0.724	1.036	0.965
9#	黑色碳质页岩	1.69	0.421	0.252	57.065	42.684	1.246	0.262	1.112	0.709	1.053	0.984
10#	灰黑色白云质页岩	1.87	0.115	2.348	70.629	27.023	1.320	0.275	1.126	0.719	1.136	1.046
11#	灰黑色白云质页岩	2.56	0.360	1.105	57.662	41.233	1.220	0.288	1.090	0.757	1.024	0.931
12#	灰黑色白云质页岩	2.15	0.344	0.713	59.893	39.394	1.226	0.308	1.101	0.759	0.998	0.919
13#	灰黑色白云质页岩	1.69	0.151	0.884	85.168	13.948	1.370	0.224	1.168	0.603	1.235	1.146
14#	灰黑色白云质页岩	1.28	0.141	1.658	80.521	17.820	1.328	0.238	1.140	0.662	1.177	1.090
15#	灰黑色白云质页岩	2.10	0.253	0.835	66.570	32.595	1.236	0.270	1.109	0.721	1.031	0.966
16#	灰黑色白云质页岩	1.10	0.167	1.436	69.717	28.846	1.310	0.232	1.118	0.675	1.188	1.078
17#	灰黑色白云质页岩	0.89	0.183	1.333	59.503	39.165	1.324	0.253	1.122	0.703	1.180	1.071
18#	灰黑色白云质页岩	3.17	0.102	1.960	87.002	11.037	1.364	0.217	1.171	0.607	1.228	1.147
19#	灰黑色白云质页岩	1.75	0.210	0.589	74.234	25.177	1.337	0.264	1.136	0.695	1.169	1.073
20#	灰黑色白云质页岩	2.55	0.149	0.945	79.074	19.981	1.359	0.260	1.148	0.682	1.200	1.100

类型	D_min	D_max	D_-1	D₁	Δα	D_min-D_max
Ⅰ	1.167~1.236	0.288~0.456	1.066~1.101	0.757~0.873	0.854~1.026	0.742~0.943
	1.216	0.336	1.089	0.790	0.966	0.881
Ⅱ	1.231~1.245	0.227~0.270	1.106~1.115	0.669~0.724	1.031~1.075	0.965~1.009
	1.237	0.251	1.111	0.700	1.053	0.986
Ⅲ	1.310~1.370	0.217~0.275	1.118~1.171	0.603~0.719	1.136~1.235	1.046~1.147
	1.339	0.245	1.141	0.668	1.189	1.093

类型	Φ-nmr/%	T₅₀/ms	微孔/%	中孔%	宏孔/%
Ⅰ	1.07~2.56	0.344~0.769	0.338~1.105	44.567~59.893	39.394~55.065
	1.89	0.514	0.596	52.704	46.700
Ⅱ	0.86~2.10	0.253~0.421	0.252~1.026	57.065~66.570	32.595~42.684
	1.55	0.313	0.684	62.829	36.487
Ⅲ	0.89~3.17	0.102~0.210	0.589~2.348	59.503~87.002	11.037~39.165
	1.79	0.152	1.394	75.731	22.875

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