| 断溶体油藏填充物对裂缝闭合影响试验研究 |
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| 引用本文： | 孔强夫,尚根华,刘坤岩,李小波.断溶体油藏填充物对裂缝闭合影响试验研究[J].地质科技通报,2021,40(6):70-76. |
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| 作者姓名： | 孔强夫 尚根华 刘坤岩 李小波 |
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| 基金项目： | 国家示范工程项目P19026-3中石化研究院基础前瞻项目JC-2020-KT002-6 |
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| 摘 要： | 裂缝是断溶体油藏的重要渗流通道，随着地层流体的采出，裂缝将发生闭合，其在地应力作用下的闭合规律对于储层渗透率具有重要影响。采集碳酸盐岩岩样，通过巴西劈裂实验制备裂缝试件，构建基于CT扫描灰度图像的裂缝变形分析方法，通过加压和卸压试验，研究裂缝在被不同填充物填充条件下的闭合规律，裂缝的闭合情况采用岩心渗透率和裂缝开度综合表征，以此研究裂缝填充物性质对裂缝闭合规律的影响。研究结果表明:随着围压的增大，裂缝开度和试件渗透率均逐渐降低；填充物延展性越强，裂缝在压力作用下闭合越明显，渗透率降低幅度越大；对于同样被石英填充的裂缝，不同的填充方式下裂缝闭合规律不同，对于裂缝的支撑效果，单层细砂>厚层细砂>中砂细砂混合（结果）。研究成果可为认识不同矿物填充裂缝在地应力作用下的闭合规律提供参考。
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| 关 键 词： | 塔河油田 断溶体油藏 裂缝闭合规律 CT扫描 数字岩心 |
| 收稿时间： | 2021-01-18 |
Experimental study on the effect of fillers on fracture closure in fault-karst reservoir |
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| Abstract: | Fracture is an important percolation channel in fault solution reservoir, and its closure law under geostress has an important influence on reservoir permeability.The physical simulation experiments of carbonate rock samples were carried out to study the influence of fracture occurrence (vertical fracture and high angle fracture) and filling on the law of fracture closure.The fracture specimen is prepared by Brazilian splitting experiment and wire cutting method, and the fracture deformation analysis method based on CT scanning gray image is constructed.The fracture closure is characterized by core permeability and fracture width.The results show that the fracture width and specimen permeability decrease gradually with the increase of pressure; the stronger the ductility of the filler is, the more obvious the fracture closure under pressure is, and the greater the decrease of permeability is; for quartz-filled cracks, the fracture permeability is different under different filling methods, and the supporting effect on the fracture is as follows: single layer fine sand > thick layer fine sand > medium sand and fine sand mixed. |
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