[1]张志强,师永民,李 鹤.致密储集层应力敏感性分类评价[J].新疆石油地质,2016,(01):62.[doi:10.7657/XJPG20160112]
 ZHANG Zhiqiang,SHI Yongmin,LI He.Classified Evaluation of Stress Sensitivity in Tight Reservoir Rocks[J].Xinjiang Petroleum Geology,2016,(01):62.[doi:10.7657/XJPG20160112]
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致密储集层应力敏感性分类评价()
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《新疆石油地质》[ISSN:1001-3873/CN:65-1107/TE]

卷:
期数:
2016年01期
页码:
62
栏目:
出版日期:
2016-02-01

文章信息/Info

Title:
Classified Evaluation of Stress Sensitivity in Tight Reservoir Rocks
文章编号:
1001-3873(2016)01-0062-07
作者:
张志强师永民李 鹤
(北京大学 地球与空间科学学院,北京 100871)
Author(s):
ZHANG Zhiqiang SHI Yongmin LI He
(School of Earth and Space Science, Peking University, Beijing 100871)
关键词:
鄂尔多斯盆地致密储集层应力敏感性矿物成分孔隙结构油田开发
Keywords:
Ordos basin tight reservoir rock stress sensitivity mineral composition pore structure oilfield development
分类号:
TE112.23
DOI:
10.7657/XJPG20160112
文献标志码:
A
摘要:
致密储集层应力敏感性分析,对准确认识油气开发过程中储集层伤害及合理评价油气井产能具有重要的意义。鉴于注水开发过程中有效应力场的非稳态变化导致储集层渗流能力变化的实际情况,选取了鄂尔多斯盆地安塞油田延长组3类典型岩样(泥质粉砂岩、粉砂岩和中细粒砂岩)进行储集层渗透率应力敏感性测定,通过线性方程拟合,对比分析3类岩石应力敏感性特征,并从岩石成分和微观结构对应力敏感性的影响进行综合分析。结果表明,随着有效应力的增加,泥质粉砂岩渗透率下降快,敏感性强;粉砂岩渗透率下降中等,敏感性中等偏强;中细粒砂岩渗透率下降慢,敏感性最弱。通过岩心、岩石薄片、扫描电镜、全岩X射线衍射分析及压汞实验可知,储集层应力敏感性特征主要受到岩石中矿物成分和孔隙结构2个因素的影响,而微裂缝的发育使储集层应力敏感性增强。
Abstract:
Analysis on stress sensitivity of tight reservoir rocks is of an important significance in accurate understanding of formation damage during oil?gas development and reasonable evaluation of oil?gas well productivity. In view of real situation of tight reservoir rock’s percolation changes resulted from stress field unsteady state change by waterflooding process, three types of typical rock samples (argillaceous siltstone, siltstone and medium?fine grained sandstone) of Yanchang formation in Ordos basin are used to make a measurement of the stress sensitivities of the tight reservoir permeability, and conduct correlation of the features of stress sensitivity from the three types of rock samples by means of linear fitting equation. Meanwhile, the influences of the rock constituents and microstructures on the stress sensitivity are analyzed comprehensively. Results show that with effective stress increasing, the argillaceous siltstone’s permeability decreases quickly,and its stress sensitivity is strong; the siltstone’s permeability decreases in medium range, and its stress sensitivity is medium to strong;and the medium?fine grained sandstone’s permeability decrease slowly, its stress sensitivity is weak. Through core, thin?section, SEM,whole rock X?ray diffraction analyses and mercury injection experiment, it is suggested that the stress sensitivity features of the tight reser?voir rocks are mainly influenced by two key factors of the mineral constituent and pore structure, while micro?cracks in the reservoir rocksare of the largest effect on the stress sensitivity

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更新日期/Last Update: 2016-02-28