准噶尔盆地玛湖凹陷二叠系风城组岩性对岩石力学特性的影响

李鹏; 熊健; 晏奇; 朱政文; 刘向君; 吴俊; 王振林; 张磊

doi:10.11781/sysydz202204569

准噶尔盆地玛湖凹陷二叠系风城组岩性对岩石力学特性的影响

doi: 10.11781/sysydz202204569

李鹏^1,,
熊健^2, ,,
晏奇¹,
朱政文¹,
刘向君²,
吴俊¹,
王振林¹,
张磊¹

1.
中国石油新疆油田公司勘探开发研究院, 新疆克拉玛依 834000
2.
西南石油大学油气藏地质及开发工程国家重点实验室, 成都 610500

基金项目:

中国石油重大科技专项 2019E-2602

西南石油大学青年科技创新团队项目 2018CXTD13

详细信息

作者简介:
李鹏(1987—), 男, 工程师, 从事地球物理勘探工作。E-mail: lip8@petrochina.com.cn

通讯作者:
熊健(1986—), 男, 博士, 副教授, 从事岩石物理与地质力学方面研究。E-mail: 361184163@qq.com

中图分类号: TE122.2
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- 被引次数: 0
出版历程
- 收稿日期: 2021-05-18
- 修回日期: 2022-05-31
- 刊出日期: 2022-07-28

Lithological influences to rock mechanical properties of Permian Fengcheng Formation in Mahu Sag, Junggar Basin

1.
Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
2.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

摘要

摘要: 以准噶尔盆地玛湖凹陷下二叠统风城组储层岩石为研究对象，基于室内力学试验研究了风城组储层不同岩性岩石的力学行为，从而揭示风城组储层不同岩性岩石的力学特性。在此基础上，讨论了矿物组成对风城组储层岩石强度参数的影响。玛湖凹陷风城组储层岩石具有较强的非均质性，造成不同岩性岩石力学特性存在较明显的差异，其中云质类岩石的力学强度和弹性模量较大而泊松比较小；岩石破坏形式较单一，其中单轴条件下，岩样脆性较强，表现为拉张破坏特征，而高围压条件下，岩样脆性减弱、延性增强，主要表现为单剪切破坏特征；岩石的抗压强度、抗张强度、断裂韧性值随着硅质矿物含量的增加呈减小的趋势，而随着钙质矿物含量的增加呈增大的趋势。
- 岩石力学特性 /
- 矿物组成 /
- 破坏特征 /
- 风城组 /
- 下二叠统 /
- 玛湖凹陷 /
- 准噶尔盆地
Abstract: To reveal the mechanical properties of the rocks of the Fengcheng Formation, the rocks of the Lower Permian Fengcheng Formation in the Mahu Sag of Junggar Basin were taken for the laboratory mechanical tests to obtain mechanical behaviors of the rocks, the influence of mineral compositions on strength parameters of the rocks of the Fengcheng Formation was then discussed. The rocks of the Fengcheng Formation in the Mahu Sag have strong heterogeneity, which results in obvious differences of mechanical properties of rocks with different lithologies. The mechanical strength and elastic modulus of dolomitic rocks are higher, but the Poisson's ratio is lower. The form of rock fracturing is relatively simple. Under uniaxial conditions, rock samples have strong brittleness, which is characterized by tensile fracturing, while under high confining pressure, rock samples have weaker brittleness and enhanced ductility, which is mainly characterized by single shear fracturing. The compressive strength, tensile strength and fracture toughness of rocks decrease with the increase of siliceous mineral content, while increase with the increase of calcium mineral content.
- rock mechanical properties /
- mineral composition /
- fracturing form /
- Fengcheng Formation /
- Lower Permian /
- Mahu Sag /
- Junggar Basin

HTML全文

图 1 准噶尔盆地玛湖凹陷下二叠统风城组岩样的矿物组成

Figure 1. Mineral composition of rock samples from Lower Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 2 准噶尔盆地玛湖凹陷下二叠统风城组样品典型薄片

a.MY1井，4 664.85 m，白云质泥岩，普通薄片；b.JL53井，5 041.80 m，白云质细砂岩，普通薄片；c.JL53井，5 041.80 m，白云质细砂岩，普通薄片(+)；d.M025井，4 305.3 m，凝灰质细砂岩，普通薄片；e.MY1井，4 590.31 m，泥质砂岩，见溶蚀孔，蓝色铸体；f.MY1井，4 897.39 m，熔结凝灰岩，粒间孔发育，蓝色铸体

Figure 2. Typical thin sections of experimental samples from Lower Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 3 准噶尔盆地玛湖凹陷二叠系风城组不同岩性岩样单轴和三轴抗压强度对比

Figure 3. Comparison of uniaxial and triaxial compressive strength of rock samples of different lithologies from Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 4 准噶尔盆地玛湖凹陷二叠系风城组不同岩性岩样弹性模量对比

Figure 4. Comparison of elastic modulus of rock samples of different lithologies from Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 5 准噶尔盆地玛湖凹陷二叠系风城组不同岩性岩样泊松比对比

Figure 5. Comparison of Poisson's ratio of rock samples of different lithologies from Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 6 准噶尔盆地玛湖凹陷二叠系风城组不同岩性岩样脆性指数对比

Figure 6. Comparison of brittle index of rock samples of different lithologies from Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 7 准噶尔盆地玛湖凹陷二叠系风城组不同岩性岩样抗张强度对比

Figure 7. Comparison of tensile strength of rock samples of different lithologies from Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 8 准噶尔盆地玛湖凹陷二叠系风城组不同岩性样品断裂韧性对比

Figure 8. Comparison of fracture toughness of samples of different lithologies from Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 9 准噶尔盆地玛湖凹陷二叠系风城组单轴(a-e) 和三轴(a′-e′)压缩试验条件下岩样的破坏模式

Figure 9. Fracturing mode of rock samples under uniaxial and triaxial compression conditions from Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 10 准噶尔盆地玛湖凹陷二叠系风城组巴西劈裂条件下岩样的破坏模式

Figure 10. Fracturing mode of rock samples under Brazilian splitting test conditions from Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 11 准噶尔盆地玛湖凹陷二叠系风城组断裂韧性测试条件下岩样的破坏模式

Figure 11. Fracturing mode of rock samples under fracture toughness test conditions from Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 12 准噶尔盆地玛湖凹陷二叠系风城组单轴和三轴压缩条件下不同岩性岩样的应力—应变曲线

Figure 12. Stress-strain curves of rock samples of different lithologies under uniaxial and triaxial compressions from Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 13 准噶尔盆地玛湖凹陷二叠系风城组矿物组成对岩样单轴抗压强度的影响

Figure 13. Effect of mineral composition on uniaxial compressive strength of rock samples from Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 14 准噶尔盆地玛湖凹陷二叠系风城组矿物组成对岩样三轴抗压强度(60 MPa)的影响

Figure 14. Effect of mineral composition on triaxial compressive strength of rock samples from Permian Fengcheng Formation in Mahu Sag, Junggar Basin (60 MPa)

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图 15 准噶尔盆地玛湖凹陷二叠系风城组矿物组成对岩样抗张强度的影响

Figure 15. Effect of mineral composition on tensile strength of rock samples from Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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图 16 准噶尔盆地玛湖凹陷二叠系风城组矿物组成对岩样断裂韧性的影响

Figure 16. Effect of mineral composition on fracture toughness of rock samples from Permian Fengcheng Formation in Mahu Sag, Junggar Basin

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表 1 准噶尔盆地玛湖凹陷下二叠统风城组岩样的取样信息

Table 1. Sampling information of rock samples from Lower Permian Fengcheng Formation in Mahu Sag, Junggar Basin

编号	井名	取样深度/m	岩性	编号	井名	取样深度/m	岩性
1	JL53	4 888.50~4 889.15	白云质泥岩	11	MY1	4 581.90~4 582.29	白云质泥岩
2		4 889.28~4 889.91	白云质泥岩	12		4 582.89~4 583.13	灰质泥岩
3		4 890.62~4 890.63	白云质泥岩	13		4 818.80~4 818.94	白云质泥岩
4		5 040.98~5 041.94	白云质细砂岩	14		4 820.90~4 821.18	白云质泥岩
5		5 045.16~5 047.64	白云质细砂岩	15		4 821.70~4 822.01	白云质粉砂岩
6	M025	4 310.51~4 312.01	凝灰质细砂岩	16		4 822.01~4 822.19	白云质泥岩
7		4 313.68~4 314.12	凝灰质细砂岩	17		4 894.17~4 895.00	凝灰质细砂岩
8		4 315.59~4 316.19	凝灰质细砂岩	18		4 907.91~4 909.19	熔结凝灰岩
9	X87	4 358.08~4 359.59	白云质泥岩	19		4 910.83~4 911.36	熔结凝灰岩
10	X87	4 368.73~4 369.75	白云质泥岩	20		4 911.82~4 912.49	安山岩

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表 2 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩岩样的抗张强度^[29]

Table 2. Tensile strength of shale samples from Permian Lucaogou Formation in Jimusar Sag, Junggar Basin

序号	岩性	围压/MPa	抗压强度/MPa
1	白云质砂岩	11.03	227.67
2	泥岩	22.06	293.35
3	泥质粉砂岩	11.03	161.84
4	灰质砂岩	11.03	223.76
5	粉砂质泥岩	22.06	269.64

下载: 导出CSV

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