西加盆地B气田致密砂岩储层应力敏感评价  

Evaluation on Stress Sensitivity of Tight Sandstone in B Gasfield of Western Canada Basin

作　　者：王欣 齐梅 胡永乐 

机构地区：[1]中油勘探开发研究院,北京100083

出　　处：《特种油气藏》2015年第2期85-88,155,共4页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"全球剩余油气资源研究及油气资产快速评价技术"(2008ZX05028)

摘　　要：描述致密砂岩储层渗透率应力敏感有多种经验公式,根据岩心类型的不同,对各经验公式的应用尚存在争议。依据基质孔隙和裂缝尺度不同,将研究区储层介质划分为"微小孔+裂缝"模型和"中大孔+裂缝"模型2种类型,结合应力敏感实验对经验公式进行验证。实验结果表明,"微小孔+裂缝"模型储层的渗透率随有效应力变化符合幂律式,"中大孔+裂缝"模型符合指数式。Walsh模型的回归结果表明,"微小孔+裂缝"模型拟合结果较好,说明该类储层裂缝对渗透率的贡献起绝对支配作用,渗透率随有效应力变化符合幂律式。There are various empirical formulas to describe the sensitivity of stress on the permeability in tight sandstone reservoir.Based on the difference of core types,the application of each empirical formula is still controversial. Based on the different sizes of pores in matrix and fractures,the reservoir media of the study area are divided into two types of'micro pore + fracture model'and'medium or large pore + fracture model'. Combined with the sensitivity experiment,the empirical formula is verified. The experiment results indicate the permeability change of'micro pore + fracture model'with the change of effective stress conforms to power law formula while the 'medium or large pore + fracture model'conforms to exponential formula. The regression results of the Walsh model reveal that the 'micro pore + fracture model'matches well,indicating the fracture of this type of reservoir is dominant for the contribution of permeability. The change of permeability with effective stress conforms to law power formula.

关 键 词：致密砂岩储层 应力敏感 裂缝 西加盆地 

分 类 号：TE312[石油与天然气工程—油气田开发工程]