朝阳沟油田杨大城子油层微观孔隙结构特征研究

doi:10.3969/j.issn.1006-396X.2021.04.007

摘要/Abstract

摘要：

多年水驱开发，与扶余油层相比相同渗透率级别杨大城子油层表现出含水率上升快、注水压力高、开发效果差等问题。为了找出问题的原因，对杨大城子油层微观孔隙结构特征进行研究。首先分别应用CT扫描和恒速压汞技术测量不同渗透率级别杨大城子油层和扶余油层共18块天然岩心的微观孔隙结构，研究喉道半径、孔隙半径、孔喉比、配位数等微观孔隙结构分布频率及变化规律，然后进行多参数线性回归分析，明确影响储层渗透率大小的主控微观孔隙结构参数，最后与相同渗透率级别的扶余油层岩心相对比。结果表明，对于储层渗透率相同的杨大城子油层与扶余油层，平均孔隙半径相差不到1%，而喉道半径、孔喉比、配位数等微观孔隙结构特征具有明显差异，分别相差17.4%、8.9%、5.2%，是决定储层渗流能力大小的关键因素。

关键词: 杨大城子油层, 微观孔隙结构, 恒速压汞, 主控因素, 扶余油层

Abstract:

Years of waterflooding researches show that Yangdachengzi reservoir possessing the same permeability level with Fuyu reservoir, has some severely problems, such as more rapid increasing of water cut, higher water injection pressure and poorer development effect. In order to study the influence factors for these problems, micro pore structure of Yangdachengzi reservoir was investigated. Firstly, the micro pore structure of 18 natural cores in Yangdachengzi and Fuyu reservoirs with different permeability levels, including throat radius, pore radius, pore throat ratio and coordination number were compared using CT scanning and constant velocity mercury injection technology respectively, in order to find out the distribution frequency and variation rules of micro pore structure. Then, the most controlling micro pore structure parameter affecting reservoir permeability was investigated using multi parameter linear regression analysis method. Finally, the pore structure parameters were compared with those of Fuyu oil layer with the same permeability level to explain the reasons for poor physical properties and difficult development of Yangdachengzi oil layer. The results show that the average pore radius difference is less than 1% between the Yangdachengzi and Fuyu reservoir with the same reservoir permeability, while the throat radius, pore throat ratio, coordination number and other microscopic pore structure parameters exhibit significant differences of 17.4%, 8.9% and 5.2% respectively, which are the key factors determining the reservoir seepage capacity.

Key words: Yangdachengzi reservoir, Micro pore structure, Constant rate mercury injection, Main control factor, Fuyu reservoir

中图分类号:

TE122

殷代印, 张旭东. 朝阳沟油田杨大城子油层微观孔隙结构特征研究[J]. 石油化工高等学校学报, 2021, 34(4): 39-45.

Daiyin Yin, Xudong Zhang. Study on Micro Pore Structure Characteristics of Yangdachengzi Oil Layer in Chaoyanggou Oilfield[J]. Journal of Petrochemical Universities, 2021, 34(4): 39-45.

图/表 9

图1 不同渗透率不同参数分布曲线

Fig.1 Distribution curves of different permeability and parameters

图2 恒速压汞技术测试储层孔隙结构原理示意

Fig.2 Schematic diagram of pore structure testing by constant velocity mercury injection technology

图3 岩心孔隙半径、喉道半径分布

Fig.3 Distribution curve of core pore radius and throat radius

表1 压汞岩心孔喉参数实验结果

Table 1 Experimental results of pore throat parameters of mercury injection core

序号	渗透率/mD	孔隙度/%	平均喉道半径/μm	最大喉道半径/μm	主流喉道半径/μm	均质系数	相对分选系数
1	7.42	16.42	1.69	4.70	2.64	0.41	0.47
2	7.18	16.07	1.62	4.54	2.57	0.39	0.47
3	6.57	16.01	1.64	3.79	2.43	0.38	0.47
4	4.71	15.92	1.27	3.33	1.96	0.38	0.47
5	3.92	15.67	1.21	3.04	1.84	0.40	0.47
6	3.57	15.44	1.19	2.87	1.86	0.38	0.49
7	2.08	14.13	1.12	2.78	1.59	0.38	0.47
8	1.66	13.38	0.95	2.52	1.48	0.36	0.51
9	1.57	13.77	0.88	2.36	1.36	0.39	0.50

图4 喉道大小对渗透率贡献率和累积贡献率分布曲线

Fig.4 Distribution curve of throat size contribution to permeability and cumulative contribution

表2 不同渗透率级别岩心微观孔隙特征

Table 2 Micro pore characteristics of cores of different permeability levels

油层	渗透率级别/mD	平均孔隙半径/μm	平均喉道半径/μm	平均孔喉比	平均配位数
扶余	5~10	95.7	1.65	77.56	3.46
	2~5	93.1	1.37	117.49	2.78
	<2	89.9	1.17	135.98	2.48
杨大城子	5~10	95.0	1.52	85.27	3.33
	2~5	92.6	1.16	128.34	2.63
	<2	89.4	0.81	150.70	2.30

图5 渗透率与孔隙结构参数的关系

Fig.5 Relationship between permeability and pore structure parameters

图6 渗透率与孔隙结构参数的对比

Fig.6 Comparison of permeability and pore structure parameters

表3 杨大城子油层与扶余油层微观孔隙结构分布特征差异统计

Table 3 Statistical table of the difference of micro pore structure distribution characteristics between Yangdachengzi reservoir and Fuyu reservoir

杨大

城子

扶余

差值

杨大

城子

扶余

差值

杨大

城子

扶余

差值

杨大

城子

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