应力作用下气藏水体微观赋存特征及渗流规律——以鄂尔多斯盆地神木气田二叠系盒8段致密储层为例

马云峰; 赵建国; 孙龙; 暴玉宁; 曹青赟; 巩肖可; 陈朝兵; 王恒力

doi:10.11781/sysydz202303466

应力作用下气藏水体微观赋存特征及渗流规律——以鄂尔多斯盆地神木气田二叠系盒8段致密储层为例

doi: 10.11781/sysydz202303466

1.
中国石油长庆油田分公司第二采气厂, 西安 710200
2.
西安石油大学地球科学学院, 西安 710065
3.
延安大学石油工程与环境工程学院, 陕西延安 716000

基金项目:

国家自然科学基金 41802140

国家科技重大专项 2016ZX05050006

陕西省自然科学研究基础计划项目 2019JQ-257

详细信息

作者简介:
马云峰(1971—)，男，硕士，工程师，从事致密气藏提高采收率系统研究。E-mail: 1754613726@qq.com

通讯作者:
王恒力(1991—)，男，博士，讲师，从事致密气藏渗流机理研究。E-mail: wanghengli@yau.edu.cn

中图分类号: TE122.2
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出版历程
- 收稿日期: 2022-10-26
- 修回日期: 2023-04-10
- 刊出日期: 2023-05-28

Microscopic occurrence characteristics and seepage law of water bodies in gas reservoir under stress: a case study of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

1.
Second Gas Production Plant, Changing Oilfield Company, PetroChina, Xi'an, Shaanxi 710200, China
2.
College of Earth Sciences & Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China
3.
School of Petroleum Engineering and Environmental Engineering, Yan'an University, Yan'an, Shaanxi 716000, China

摘要

摘要: 针对致密气藏衰竭开发过程中储层孔隙结构及流体微观赋存特征随其所受应力大小实时变化的问题，以鄂尔多斯盆地神木气田二叠系石盒子组盒8段致密储层为例，通过核磁共振、高压压汞以及驱替实验，定量表征不同应力条件下孔隙结构、水体动用及束缚水分布特征，分析应力对气水相渗规律的影响。研究表明，有效应力由7 MPa增加至17 MPa后，储层孔隙度由8.39%减小至7.65%，最大孔隙半径由38.3 μm减小至35.2 μm，其中半径为0.3~18.9 μm范围内的孔喉数量减少幅度最大；由于孔喉尺寸减小，参与渗流的孔隙数量减少，束缚水饱和度由51.3%增加至59.7%，束缚水水体尺寸的分布范围由0.012~17.4 μm增大至0.012~20.1 μm；孔隙变化及束缚水分布特征的变化进一步导致气水两相相对渗透率均减小，气相相对渗透率由0.481减小至0.283，等渗点的相对渗透率由0.157减小至0.09。
- 致密气藏 /
- 应力 /
- 孔隙结构 /
- 流体分布 /
- 渗流特征 /
- 神木气田 /
- 鄂尔多斯盆地
Abstract: In order to solve the problem that the pore structure and the microscopic occurrence characteristics of fluid change with stress in real time during the depletion development of tight gas reservoirs, the pore structure, water production and irreducible water distribution characteristics of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin under different stress conditions were quantitatively characterized, and the influence of stress on gas-water relative permeability was analyzed by using nuclear magnetic resonance (NMR), high-pressure mercury injection (HPMI) and displacement experiments. The results show that when effective stress increases from 7 MPa to 17 MPa, reservoir porosity decreases from 8.39% to 7.65%, and the maximum pore radius decreases from 38.3 μm to 35.2 μm among which, the number of pore throats in the range of 0.3-18.9 μm decreases the most. The number of pores involved in seepage decreases due to the decrease of pore throat size, the bound water saturation increases from 51.3% to 59.7%, and the distribution range of the size of bound water increases from 0.012-17.4 μm to 0.012-20.1 μm. The changes of pore structure and bound water distribution characteristics further reduce the relative permeability of both gas and water phases, the relative permeability of gas phase decreases from 0.481 to 0.283, and that of isotonic point decreases from 0.157 to 0.09.
- tight gas reservoir /
- stress /
- pore structure /
- fluid distribution /
- percolation characteristics /
- Shenmu Gas Field /
- Ordos Basin

HTML全文

图 1 鄂尔多斯盆地神木气田二叠系盒8段致密储层矿物成分

Figure 1. Mineral composition of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

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图 2 鄂尔多斯盆地神木气田二叠系盒8段致密储层岩石颗粒接触方式

Figure 2. Contact mode of rock particles in tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

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图 3 鄂尔多斯盆地神木气田二叠系盒8段致密储层孔隙类型

Figure 3. Pore types of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

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图 4 鄂尔多斯盆地神木气田二叠系盒8段实验岩心切割位置

Figure 4. Cutting diagram of experimental cores from the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

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图 5 核磁共振驱替实验设备

①驱替系统，②核磁监测系统，③辅助系统

Figure 5. Equipment drawing of NMR displacement experiment

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图 6 鄂尔多斯盆地神木气田二叠系盒8段致密储层高压压汞实验结果

Figure 6. Results of high pressure mercury injection experiment of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

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图 7 鄂尔多斯盆地神木气田二叠系盒8段致密储层核磁共振结果

Figure 7. Results of NMR in tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

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图 8 高压压汞和核磁共振技术联合表征神木气田盒8段致密储层孔喉分布

Figure 8. Characterization of pore throat distribution of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin by high pressure mercury injection and NMR technology

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图 9 鄂尔多斯盆地神木气田二叠系盒8段致密储层孔喉半径及束缚水分布特征

Figure 9. Distribution characteristics of pore-throat radius and bound water in tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

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图 10 鄂尔多斯盆地神木气田二叠系盒8段致密储层不同应力条件下的气水相渗曲线

Figure 10. Gas-water permeability curves under different stress conditions in tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

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图 11 鄂尔多斯盆地神木气田二叠系盒8段致密储层不同应力条件下的孔隙半径分布曲线

Figure 11. Curves of pore radius distribution under different stress conditions in tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

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图 12 鄂尔多斯盆地神木气田二叠系盒8段致密储层不同应力条件下束缚水分布特征

Figure 12. Characteristics of bound water distribution under different stress conditions in tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

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