基于恒速压汞技术的特低—超低渗砂岩储层微观孔喉特征

高辉; 解伟; 杨建鹏; 张创; 孙卫

doi:10.11781/sysydz201102206

基于恒速压汞技术的特低—超低渗砂岩储层微观孔喉特征

doi: 10.11781/sysydz201102206

高辉¹,
解伟²,
杨建鹏³,
张创²,
孙卫⁴

1.
西安石油大学, 石油工程学院, 西安, 710065
2. 陕西延长石油(集团)有限责任公司研究院, 西安, 710075
3. 陕西延长石油(集团)有限责任公司延长油田股份有限公司南区采油厂, 陕西, 延安, 716000
4. 西北大学, 地质学系, 西安, 710069

基金项目: “十一.五”国家科技支撑计划项目(2007BAB17B02);陕西省教育厅2010年科学研究计划项目(2010JK778)资助

详细信息

作者简介:
高辉(1979- ),男,博士,讲师,从事油气田地质与开发方面的教学和科研工作.E-mail:ghtopsun@yahoo.com.cn.

中图分类号: TE348
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出版历程
- 收稿日期: 2010-08-13
- 修回日期: 2011-02-09
- 刊出日期: 2011-04-28

Pore throat characteristics of extra-ultra low permeability sandstone reservoir based on constant-rate mercury penetration technique

1.
College of Petroleum Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China
2. Research Institute of Shaanxi Yanchang Petroleum(Group), Co, Ltd, Xi'an, Shaanxi 710075, China
3. Southern Oil Production Plant, Yanchang Oilfield Corporation, Shaanxi Yanchang Petroleum (Group), Co, Ltd, Yan'an, Shaanxi 716000, China
4. Department of Geology, Northwest University, Xi'an, Shaanxi 710069, China

摘要

摘要: 基于恒速压汞测试结果,对鄂尔多斯盆地延长组特低、超低渗砂岩储层的微观孔喉特征进行了分析,定量表征了孔喉特征参数的变化。结果表明,特低、超低渗储层的孔隙半径分布特征相似,介于100~200μm之间,峰值基本在140μm左右;相对于特低渗储层而言,超低渗储层的喉道分布范围更窄,小于1μm的喉道含量较高,变化更为敏感,孔喉半径比分布范围较宽,喉道进汞饱和度受渗透率影响较大;特低、超低渗储层孔喉特征的差异主要体现在喉道上。总体毛细管压力曲线表现出3个变化阶段,渗透率不同,各阶段受孔隙和喉道的影响程度也不同;处于中后期的超低渗储层更应注重喉道的开发。
- 孔喉特征 /
- 储层品质 /
- 恒速压汞 /
- 特低—超低渗砂岩储层 /
- 鄂尔多斯盆地
Abstract: Based on constant-rate mercury penetration technique, micro pore throat characteristics of extraultra low permeability sandstone reservoir of the Yangchang Formation in the Ordos Basin were analyzed, and the alterations of pore throat characteristic parameters were also quantitatively characterized. Pore radiuses were similar, usually 100～200 μm, and the peak values were about 140 μm. Compared to those in the extra-low permeability reservoir, distribution ranges of throat in the ultra-low permeability reservoir were narrow. Throats less than 1 μm accounted for large amount, and were more sensitive to permeability. Distribution ranges of pore throat radius ratio were wide and permeability had big influence on input mercury saturation of throat in ultra-low permeability reservoir. The differences of pore throat characteristics between extra-and ultra-low permeability sandstone reservoir mainly lay in throats. 3 variation periods were identified on overall capillary pressure curves. Each period was affected by pore or throat in different extent due to different permeability. Throats should be focused on in the ultra-low permeability reservoir during the middle and latter stages.
- pore throat characteristics /
- reservoir quality /
- constant-rate mercury penetration /
- extra-ultra low permeability sandstone reservoir /
- Ordos Basin

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