基于粒径分类的致密砂岩力学特性及破坏特征研究——以鄂尔多斯盆地二叠系下石盒子组为例

赵宁; 王亮; 张磊; 司马立强; 刘志远; 温登峰

doi:10.11781/sysydz202204720

基于粒径分类的致密砂岩力学特性及破坏特征研究——以鄂尔多斯盆地二叠系下石盒子组为例

doi: 10.11781/sysydz202204720

赵宁^{1, 2,},
王亮^3, ,,
张磊⁴,
司马立强¹,
刘志远⁵,
温登峰⁶

1.
西南石油大学地球科学与技术学院, 成都 610500
2.
埃因霍芬理工大学机械工程学院, 荷兰埃因霍芬 5612AZ
3.
成都理工大学能源学院, 成都 610059
4.
中国石油新疆油田公司勘探开发研究院, 新疆克拉玛依 834000
5.
中国石化石油勘探开发研究院, 北京 100083
6.
西南石油大学团委, 成都 610500

基金项目:

国家自然科学基金联合基金项目“热液作用下的深部含铀油蚀变砂岩地球物理响应及铀油兼探方法” U2003102

详细信息

作者简介:
赵宁(1992—), 男, 博士研究生, 从事岩石物理实验与复杂储集层测井评价研究。E-mail: zn126000_petrol@126.com

通讯作者:
王亮(1986—), 男, 教授, 从事油气测井方法、解释及地质应用方面的研究。E-mail: wangliang_swpu@163.com

中图分类号: TE311
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- 被引次数: 0
出版历程
- 收稿日期: 2021-05-07
- 修回日期: 2022-06-07
- 刊出日期: 2022-07-28

Mechanical properties and fracturing characteristics of tight sandstones based on granularity classification: a case study of Permian Lower Shihezi Formation, Ordos Basin

ZHAO Ning^{1, 2
,},
WANG Liang^{3
, ,},
ZHANG Lei⁴,
SIMA Liqiang¹,
LIU Zhiyuan⁵,
WEN Dengfeng⁶

1.
School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2.
Department of Mechanical Engineering, Eindhoven University of Technology, Eindhoven 5612AZ, Netherlands
3.
College of Energy Resources, Chengdu University of Technology, Chengdu, Sichuan 610059, China
4.
Research Institute of Petroleum Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
5.
Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
6.
Youth League Committee, Southwest Petroleum University, Chengdu, Sichuan 610500, China

摘要

摘要: 鄂尔多斯盆地二叠系下石盒子组致密砂岩具有物性差、地层压力异常、隔夹层发育等工程地质特征，储层压裂改造力学参数的选取及其破坏特征对油气田实现效益开采具有重要意义。针对下石盒子组致密砂岩，以平行试验为设计思路，开展抗张强度测试及模拟原地状态下的高温高压三轴力学试验，在粒径分类基础上，探索致密砂岩力学特性和变形破坏特征。该区下石盒子组致密砂岩可分为中—细粒岩屑砂岩、粗粒岩屑砂岩以及巨—粗粒岩屑砂岩，粒径越粗则物性越好，其石英含量越高则黏土含量越低；随着粒径由细至粗，力学强度和弹性参数逐渐减小，岩石抵抗变形以及保持结构完整性的能力降低，力学试验变形破坏呈脆性向基质混合型过渡的特征。在相同的地应力及施工作业条件下，岩石类型不同则储层压裂难易及改造效果均有差别，需根据地层实际情况选用不同的工程力学参数。
- 粒径分类 /
- 力学特征 /
- 破坏特征 /
- 致密砂岩 /
- 下石盒子组 /
- 二叠系 /
- 鄂尔多斯盆地
Abstract: Tight sandstone reservoirs of the Lower Shihezi Formation in the Ordos Basin are characterized by poor physical properties, abnormal formation pressure, and the development of high-strength interlayers, etc. Thus, the selection of mechanical parameters and the fracturing characteristics of the reservoirs are significant for the effective development of oil and gas fields. For the tight sandstone samples from the Lower Shihezi Formation in the Hangjinqi area of the Ordos Basin, we carried out parallel experiments to test tensile strength, and to make triaxial mechanical experiments with high temperature and high pressure of in-situ conditions. Based on granularity classification, the mechanical strength properties and fracturing characteristics of tight sandstones were discussed. The tight sandstones in the Lower Shihezi Formation can be classified as medium- to fine-grained lithic sandstones, coarse-grained lithic sandstones, and giant- to coarse-grained lithic sandstones. The coarser the particle size, the better the physical properties, and the higher the quartz content, the lower the clay content. As particle size increases from fine to coarse, the mechanical strength and elastic parameters gradually decrease, and the ability of rock to resist deformation and maintain structural integrity decreases. The fracturing of the samples show the characteristics of brittleness to matrix mixing. Under the same stress and construction conditions, different rock types will result in various reservoir fracturing difficulty and stimulation effects. Different engineering mechanic parameters should be selected according to actual formation conditions.
- granularity classification /
- mechanical properties /
- fracturing characteristics /
- tight sandstone /
- Lower Shihezi Formation /
- Permian /
- Ordos Basin

HTML全文

图 1 鄂尔多斯盆地二叠系下石盒子组砂岩岩性与孔隙类型

a.中—细粒岩屑砂岩，锦110井，3 011.61 m；b.粗粒岩屑砂岩，锦110井，3 167.99 m；c.巨—粗粒岩屑砂岩，锦110井，3 157.36 m；d.图 1a岩心柱塞样轴向断面；e.图 1b岩心柱塞样轴向断面；f.图 1c岩心柱塞样轴向断面；g.中—细粒岩屑砂岩铸体薄片，微裂缝；h.粗粒岩屑砂岩铸体薄片，杂基溶孔；i.巨—粗粒岩屑砂岩铸体薄片，粒间溶孔

Figure 1. Lithology and pore types of sandstones in Permian Lower Shihezi Formation, Hangjinqi area, Ordos Basin

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图 2 平行岩样切割示意

Figure 2. Parallel sample cutting

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图 3 鄂尔多斯盆地二叠系下石盒子组不同岩性致密砂岩法向力随时间变化曲线

Figure 3. Variation trend of normal force with time for different types of tight sandstones from Permian Lower Shihezi Formation, Ordos Basin

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图 4 鄂尔多斯盆地二叠系下石盒子组不同岩性致密砂岩三轴力学试验应力—应变曲线

Figure 4. Stress-strain curves during triaxial compression of different rock types in Permian Lower Shihezi Formation, Ordos Basin

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图 5 鄂尔多斯盆地二叠系下石盒子组致密砂岩矿物成分、物性与抗张强度交会图

Figure 5. Relationship among mineral composition, physical properties and tensile strength of tight sandstones from Permian Lower Shihezi Formation, Ordos Basin

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图 6 鄂尔多斯盆地二叠系下石盒子组不同岩性致密砂岩抗张试验破坏特征

测试后岩样破坏特征：a.中—细粒岩屑砂岩，2 987.5 m；b.粗粒岩屑砂岩，3 102.7 m；c.巨—粗粒岩屑砂岩，3 026.82 m

Figure 6. Tensile-strength test induced fracture geometry of tight sandstones from Permian Lower Shihezi Formation, Ordos Basin

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图 7 鄂尔多斯盆地二叠系下石盒子组致密砂岩矿物成分含量、物性与三轴力学参数交会图

Figure 7. Relationship among mineral composition, physical properties and triaxial mechanical parameters of tight sandstones from Permian Lower Shihezi Formation, Ordos Basin

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图 8 鄂尔多斯盆地二叠系下石盒子组致密砂岩三轴力学试验破坏特征及轴向应力—应变曲线

三轴破坏特征：a.中—细粒岩屑砂岩，3 102.7 m；b.粗粒岩屑砂岩，3 159.93 m；c.巨—粗粒岩屑砂岩，3 016.49 m

Figure 8. Triaxial compression test induced fracture geometry and stress-strain curves of tight sandstones from Permian Lower Shihezi Formation, Ordos Basin

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表 1 鄂尔多斯盆地二叠系下石盒子组试验岩样基础参数

Table 1. Basic parameters of tight sandstones from Permian Lower Shihezi Formation, Ordos Basin

编号	孔隙度/%	渗透率/10^-3 μm²	石英/%	黏土/%	长石/%	方解石/%	岩性
50	4.88	0.040 3	51.4	38.7	9.9	0	中—细粒岩屑砂岩
21	3.03	0.034 7	54.5	42.7	2.9	0
69	4.65	0.030 2	62.3	34.9	2.9	0
101	7.39	0.119 5	70.6	23.9	2.7	2.8	粗粒岩屑砂岩
24	8.04	0.189 2	66.2	29.2	2.2	2.4
80	9.44	0.219 1	63.3	30.4	2.3	3.9
10	9.41	0.278 1	69.1	26.9	2.2	1.8
5	10.59	0.183 7	76.7	13.7	2.2	7.4	巨—粗粒岩屑砂岩
11	12.03	0.634 2	74.2	18.0	2.2	5.6
12	12.96	0.454 3	80.2	13.1	2.6	4.1
23	10.12	0.594 6	77.7	19.7	2.6	0

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