复杂砾岩油水核磁弛豫特性的实验分析

田超国; 王雪亮; 魏博; 梁晶; 毛文红; 耿雪杰; 李慧莹

doi:10.19975/j.dqyxx.2022-074

复杂砾岩油水核磁弛豫特性的实验分析

doi: 10.19975/j.dqyxx.2022-074

1.
中国石油集团测井有限公司，西安 710077
2.
中国石油冀东油田分公司勘探开发研究院，唐山 063004

基金项目: 中石油集团重大科技专项：测井重大技术现场试验与集成配套（2019D-3809）；中国石油集团测井有限公司十大科技项目：项目八课题一“岩石物理实验分析技术研究与应用”（CNLC 2022-08B01）

详细信息

作者简介:
田超国（1984-），男，工程师，主要从事岩石物理与测井解释评价的研究. E-mail：tianchaoguo@petrochina.com.cn

通讯作者:
王雪亮（1979-），男，高级工程师. 主要从事岩石物性、电性、声学、核磁共振实验及测井应用方面的研究. E-mail：wangxuel@cnpc.com.cn

中图分类号: P631
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- 被引次数: 0
出版历程
- 收稿日期: 2022-11-22
- 录用日期: 2023-02-13
- 修回日期: 2023-02-01
- 网络出版日期: 2023-02-20

Experimental analysis of oil-water nuclear magnetic relaxation characteristics of complex conglomerate reservoir

1.
China Petroleum Logging Co., Ltd., Xi'an 710077, China
2.
Research Institute of Petroleum Exploration and Development, Jidong Oilfield, CNPC, Tangshan 063004, China

Funds: Supported by the Major Science and Technology Project of CNPC: Field Test and Integration of Major Logging Technology (Grant No. 2019D-3809), the Ten Scientific and Technological Projects of CNPC Logging Co. , ltd. : Project 8: "The Research and Application of Petrophysical Experimental Analysis Technology" (Grant No. CNLC 2022-08B01)

摘要

摘要: 玛湖凹陷砾岩储层岩性、孔隙结构复杂，造成储层流体识别困难. 通过区块原油样品获取原油不同温度下的体弛豫特征，并利用两种不同体弛豫特征的模拟油样开展实验；在此基础上，选取了部分砾岩样品通过真空加压饱和水、高速离心和真空饱和模拟油的方法快速建立了饱和水、束缚水和饱和油状态，进行流体及模拟不同油水饱和状态的核磁实验分析. 实验结果表明：岩心饱和水核磁T₂谱的分布范围主要受表面弛豫影响，受油相体弛豫性质的影响，不同黏度油样饱和水状态的核磁谱均与饱和水核磁谱存在差异，就本次实验的岩心样品，油样越稀，差异越明显；含油核磁谱分布形态受油相体弛豫、表面弛豫、孔隙结构和润湿性的综合影响. 结合油样的体弛豫特性，利用多组分高斯拟合对两种油样饱和的砾岩核磁T₂谱进行了分析，尝试对油相体弛豫信号进行了定量评价.
- 测井 /
- 核磁共振 /
- 低渗砾岩 /
- T₂分布谱
Abstract: The lithology and pore structure of conglomerate reservoir in the Mahu sag, China, are complex, which makes it difficult to identify reservoir fluids. In this study, the body relaxation characteristics of crude oil at different temperatures were obtained from block crude oil samples, and two simulated oil samples with different body relaxation characteristics were used to conduct experiments. The saturated water, bound water, and saturated oil states of some conglomerate samples were quickly established by vacuum compression saturation, high-speed centrifugation, and vacuum saturation simulation of oil, and the fluid and different simulated oil-water saturation states were analyzed by nuclear magnetic resonance (NMR) experiments. The experimental results showed that the distribution range of the water-saturated core NMR T₂ spectrum is mainly affected by surface relaxation. The NMR spectra of saturated oil with different viscosity values are different from those of saturated water because of the relaxation property of the oil phase. The samples of this experiment indicated that the difference is more obvious when the oil is thinner. The distribution pattern of the oil-bearing NMR results was affected by the relaxation of the oil phase, surface relaxation, pore structure, and wettability. With consideration of the relaxation characteristics of the oil samples, the NMR T₂ spectra of two oil-saturated conglomerates were analyzed by multi-component Gaussian fitting, and the relaxation signals of the oil phase were evaluated quantitatively.
- well logging /
- NMR /
- low permeability conglomerate /
- T₂ distribution spectrum

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图 1 玛湖凹陷砾岩储层岩石薄片微观特征

Figure 1. Microscopic characteristics of thin sections of conglomerate reservoir in the Mahu sag

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图 2 不同温度下三种原油样的体弛豫T₂谱

Figure 2. Bulk relaxation T₂ spectra of three crude samples at different temperatures

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图 3 两种模拟油样的体弛豫T₂谱

Figure 3. Bulk relaxation T₂spectra of two simulated oil samples

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图 4 四块岩心不同状态下的核磁共振T₂谱. 各图中的图例依次为：饱和水状态、离心状态、饱和油A状态、饱和油B状态、油A体弛豫、油B体弛豫

Figure 4. NMR T₂ spectra of four cores in different states. From top to bottom, the legend in each chart is: Saturated water state, centrifugal state, saturated oil A state, saturated oil B state, bulk relaxation T₂ spectra of oil A, bulk relaxation T₂ spectra of oil B

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图 5 核磁共振T₂谱的连续分布拟合

Figure 5. Continuous distribution fitting of NMR T₂ spectra

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表 1 岩心基本参数

Table 1. Basic parameters of the samples

序号	岩心编号	岩石定名	层位	孔隙度/%	孔隙体积/ml	气体渗透率/（10⁻³μm²）
1	15555	灰褐色含砾泥岩	T_1b	6.5	1.630	8.29
2	15575	灰色砂质砾岩	T_1b	19.7	3.801	291.00
3	15577	灰色砂质砾岩	T_1b	13.5	2.633	124.00
4	15563	灰色砂质砾岩	T_1b	11.2	2.315	20.60

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表 2 饱和水与饱和油状态下核磁T₂谱对比

Table 2. Comparison of T₂ NMR spectra of saturated water and saturated oil

岩样号	饱水谱几何均值/ms	饱油谱几何均值/ms	饱水谱特征	饱油谱特征
15555	8.94	11.92	三峰，右峰小，水峰：35.5 ms	三峰，右峰较大，油峰：354.8 ms
15563	11.03	38.62	双峰，水峰：39.8 ms	三峰，右峰出现分离，油峰：112 ms
15575	11.09	36.49	双峰，水峰：50.1 ms	四峰，右峰出现分离，油峰：794.1 ms
15577	14.47	62.47	双峰，水峰：63.1 ms	三峰，右峰出现分离，油峰：354.2 ms

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表 3 饱和油状态下核磁T₂谱连续分布拟合结果

Table 3. Results of continuous distribution fitting of NMR T₂ spectra in the saturated oil state

岩样号	$\phi_{总} $/%	$\phi_{1} $/%	$\phi_{2} $/%	$\phi_{3} $/%	$\phi_{4} $/%	含油谱特征峰值/ms	饱水谱特征峰值/ms
15563	10.2	2.5	0	6.0	1.7	0.679，89.83，965.6	0.875，44.176
15575	14.9	4.9	1.2	3.8	5.0	0.704，6.613，145.022，910.223	1.160，58.647
15577	11.7	2.7	1.3	5.3	2.4	0.841，13.903，221.008，1097.487	1.471，62.974
注：$\phi_{总} $为核磁计算总孔隙度（%）；$\phi_{1} $~$\phi_{4} $分别对应4种油谱组分区间孔隙度（%）

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