准噶尔盆地吉木萨尔页岩油不同温压CO<sub>2</sub>吞吐下可动性实验研究

王子强; 葛洪魁; 郭慧英; 周浩; 张远凯

doi:10.11781/sysydz2022061092

准噶尔盆地吉木萨尔页岩油不同温压CO₂吞吐下可动性实验研究

doi: 10.11781/sysydz2022061092

王子强^{1, 2, 3,},
葛洪魁¹,
郭慧英^{2, 3},
周浩^{2, 3},
张远凯^{2, 3}

1.
中国石油大学(北京)，北京 102249
2.
中国石油新疆油田分公司实验检测研究院，新疆克拉玛依 834000
3.
新疆页岩油勘探开发实验室，新疆克拉玛依 834000

基金项目:

新疆维吾尔自治区创新环境(人才、基地)建设专项人才专项计划—天山青年计划2019Q110

详细信息

作者简介:
王子强(1981—)，男，硕士，高级工程师，从事油气田开发实验研究及应用。E-mail: zqwang@petrochina.com.cn

中图分类号: TE357.45
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出版历程
- 收稿日期: 2022-01-04
- 修回日期: 2022-10-18
- 刊出日期: 2022-11-28

Experimental study on the mobility of Junggar Basin's Jimsar shale oil by CO₂ huff and puff under different temperatures and pressures

WANG Ziqiang^{1, 2, 3
,},
GE Hongkui¹,
GUO Huiying^{2, 3},
ZHOU Hao^{2, 3},
ZHANG Yuankai^{2, 3}

1.
China University of Petroleum (Beijing), Beijing 102249, China
2.
Research Institute of Experiment and Detection, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
3.
Xinjiang Laboratory of Shale Oil Exploration and Development, Karamay, Xinjiang 834000, China

摘要

摘要: 准噶尔盆地吉木萨尔页岩油储集层主要发育微纳尺度孔喉裂隙系统，同时油质黏稠，动用难度大，注CO₂吞吐是提高采收率的重要技术。为了认清吉木萨尔页岩油储层注CO₂吞吐下的可动性规律，对该区芦草沟组45块岩心进行了研究。储层岩性为云屑砂岩、砂屑云岩和岩屑砂岩；储层覆压孔隙度介于2.0%~22.7%之间，平均为11%，覆压渗透率平均为0.01×10^-3 μm²，小于0.1×10^-3 μm²的样品占比达90%以上。根据岩心物性分类，选取20块岩样开展核磁实验，对页岩油低场核磁共振实验测量的6个关建参数进行了优化；通过将页岩油压汞实验数据和低场核磁共振实验数据对比，在对数坐标下建立了页岩岩心的T₂值与孔隙半径之间的线性关系，通过T₂谱定量获得了页岩的孔隙半径分布。在此基础上，在不同温压条件下开展9种CO₂吞吐实验，结合采收率、动用程度等指标分析得知，半径小于300 nm的小孔隙中页岩油难以动用，300~1 000 nm的中孔隙和大于1 000 nm的大孔隙中页岩油动用程度相对较高，且随着温度和压力的提高而增大。
- 低场核磁共振 /
- CO₂吞吐 /
- 可动性 /
- 页岩油 /
- 吉木萨尔凹陷 /
- 准噶尔盆地
Abstract: Micro- and nano-scale pore-throat fissure systems were mainly developed in the Jimsar shale oil reservoir of the Junggar Basin with the oil of viscous and difficult to be produced.CO₂ huff-and-puff is an important technology to enhance the oil recovery. To understand the mobility law of Jimsar shale oil reservoir under CO₂ huff and puff, 45 cores of the Lucaogou Formation in this area were studied in this study.The cores was classified into dolomitic sandstone, doloarenite and lithic sandstone. The overburden porosity of the reservoir is 2.0%-22.7%, and the average value is only 11.0%. The average overburden permeability is 0.01×10^-3 μm², and more than 90% of the samples have permeability lower than 0.1×10^-3 μm². According to physical property classification, 20 rock samples were further selected and 6 key parameters for low-field NMR measurement were optimized. By comparing the experimental data of shale oil mercury injection with those of low-field NMR, the linear relationship between T₂ value and pore radius of shale core was established in logarithmic coordinates.The pore radius distribution of shale was obtained quantitatively according to the T₂ spectrum. 9 kinds of CO₂ huff and puff experiments were carried out under different temperatures and pressures. The analyses of recovery rate, utilization degree and other indicators show that shale oil in small pores(r < 300 nm) is difficult to produce, and the utilization degree of shale oil in medium pores (300 nm < r < 1 000 nm) and large pores(r>1 000 nm) is relatively higher, and increases with the increase of temperature and pressure.
- low-field NMR /
- CO₂ huff and puff /
- mobility /
- shale oil /
- Jimsar Sag /
- Junggar Basin

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图 1 LMR-1600型低场核磁共振分析仪

Figure 1. LMRK-1600 low-field NMR analyzer

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图 2 准噶尔盆地吉木萨尔页岩油岩心样品压汞毛管半径分布与核磁共振T₂谱分布

Figure 2. Capillary radius distribution of mercury injection and distribution of T₂ spectrum of Jimsar shale oil cores in Junggar Basin

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图 3 准噶尔盆地吉木萨尔页岩油三种岩性岩心lgr与lgT₂的线性关系

a.不同岩性累积孔隙体积分布曲线；b.不同岩性横向弛豫时间与毛管半径拟合曲线；c.不同岩性T₂谱与压汞测孔隙体积占比曲线

Figure 3. Linear relationship between lgr and lgT₂ of three lithologic cores of Jimsar shale oil in Junggar Basin

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图 4 准噶尔盆地吉木萨尔页岩油岩心CO₂吞吐实验原理

Figure 4. Experimental principle of CO₂ huff-and-puff in Jimsar shale oil cores of Junggar Basin

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图 5 准噶尔盆地吉木萨尔页岩油岩心CO₂吞吐实验装置

Figure 5. Experimental device of CO₂ huff-and-puff in Jimsar shale oil cores of Junggar Basin

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图 6 准噶尔盆地吉木萨尔页岩油同类岩性CO₂吞吐下温度对页岩油可动性的影响

Figure 6. Effect of temperature on shale oil mobility under CO₂ huff and puff in Jimsar shale oil with the same lithology, Junggar Basin

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图 7 准噶尔盆地吉木萨尔页岩油同类岩性CO₂吞吐下压力对页岩油可动性的影响

Figure 7. Effect of pressure on shale oil mobility under CO₂ huff and puff in Jimsar shale oil with the same lithology, Junggar Basin

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图 8 准噶尔盆地吉木萨尔页岩油CO₂吞吐下不同岩性对页岩油可动性的影响

Figure 8. Effect of different lithology on shale oil mobility under CO₂ huff-and-puff in Jimsar shale oil, Junggar Basin

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表 1 准噶尔盆地吉木萨尔页岩油岩心物性统计分析

Table 1. Physical property of Jimsar shale oil cores in Junggar Basin

序号	岩性	孔隙度/%	渗透率/10^-3 μm²	序号	岩性	孔隙度/%	渗透率/10^-3 μm²
1	砂屑云岩	9.7	0.011	24	云屑砂岩	20.8	0.486
2	砂屑云岩	7.9	0.016	25	云屑砂岩	22.7	0.594
3	砂屑云岩	14.0	0.282	26	云屑砂岩	10.2	0.007
4	砂屑云岩	9.0	0.014	27	云屑砂岩	11.0	0.045
5	砂屑云岩	17.3	0.712	28	云屑砂岩	7.5	0.947
6	砂屑云岩	9.7	0.016	29	云屑砂岩	2.0	0.012
7	砂屑云岩	11.8	0.093	30	云屑砂岩	14.3	0.023
8	砂屑云岩	11.7	0.045	31	云屑砂岩	9.9	0.016
9	砂屑云岩	15.4	0.041	32	云屑砂岩	9.1	0.020
10	砂屑云岩	7.2	0.028	33	云屑砂岩	7.1	0.028
11	砂屑云岩	2.5	0.154	34	云屑砂岩	7.0	0.015
12	砂屑云岩	9.2	0.020	35	砂屑云岩	10.8	0.402
13	砂屑云岩	10.2	0.056	36	云屑砂岩	9.3	0.017
14	砂屑云岩	4.7	0.031	37	岩屑砂岩	12.9	0.149
15	砂屑云岩	7.7	0.016	38	岩屑砂岩	14.5	0.250
16	砂屑云岩	8.0	0.013	39	岩屑砂岩	15.0	0.234
17	砂屑云岩	4.9	0.015	40	岩屑砂岩	11.8	0.057
18	砂屑云岩	4.9	0.014	41	岩屑砂岩	15.2	0.298
19	砂屑云岩	6.8	0.018	42	岩屑砂岩	16.1	0.298
20	砂屑云岩	13.0	0.018	43	岩屑砂岩	16.0	0.565
21	云屑砂岩	13.9	0.023	44	岩屑砂岩	17.1	0.157
22	砂屑云岩	16.0	0.065	45	岩屑砂岩	16.0	0.991
23	砂屑云岩	16.5	0.089

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表 2 准噶尔盆地吉木萨尔页岩油岩心核磁共振实验测量参数优化

Table 2. Parameter optimization of NMR experiment for Jimsar shale oil cores in Junggar Basin

参数	数值	优化原则
Tau值	70 μs	为了防止机器过热，扫描次数大于2 000时，适当增加Tau值，一般大于70 μs
回波数目	1 500	回波数目×2Tau≈3T₁
扫描次数	3 500	保证信噪比>100
等待时间	200 ms	3T₁~5T₁
相位循环	8	保证信噪比>100
回波点数	1	增加回波点数可观察弛豫信号细节，一般为1

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表 3 不同温压条件下准噶尔盆地吉木萨尔页岩油岩心CO₂吞吐实验方案

Table 3. Experimental scheme of CO₂ huff-and-puff in Jimsar shale oil cores of Junggar Basin under different temperatures and pressures

实验类别	岩心物性及实验条件
实验类别	孔隙度/%	渗透率/10^-3μm²	小圆柱尺寸(D×L)/mm	岩性	温度/℃	压力/MPa
同岩性同温不同压	7.92	0.028	25.30×68.76	云屑砂岩	50	5
	9.03	0.020	25.46×49.02	云屑砂岩	50	10
	7.16	0.023	25.70×61.58	云屑砂岩	50	15
	5.67	0.018	25.46×46.12	云屑砂岩	50	20
同岩性同压不同温	7.67	0.030	25.70×41.20	云屑砂岩	30	10
	5.94	0.031	25.56×52.14	云屑砂岩	70	10
	7.50	0.023	25.02×70.10	云屑砂岩	90	10
同温同压不同岩性	14.50	0.250	25.14×60.30	砂屑云岩	50	10
同温同压不同岩性	11.40	0.038	25.18×67.00	岩屑砂岩	50	10

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