摘要
a、b、m、n、F、I是阿尔奇公式中重要的岩电参数,在测井解释中具有重要作用.近年的研究发现,在低渗储层中,孔隙结构直接影响储层产能评价的准确性.然而在目前的低渗储层岩电实验研究中,仅仅对几个岩电参数进行分析,而没有从孔隙结构的角度全面和系统的研究a、b、m、n、F、I六个岩电参数及其变化规律.为此,在充分利用高压隔板岩电实验的基础上,结合压汞测试、核磁共振等资料,对安岳地区须二段低渗储层不同孔隙结构的岩电参数变化规律及其与产能的关系进行分析.结果表明,研究区Ⅰ~Ⅳ四类孔隙结构对应的a、b、m、n、F、I各岩电参数的变化范围不同;Ⅰ类到Ⅳ类孔隙结构的a、n、F变化范围值递增,b、m变化范围值递减.低渗储层的产能与孔隙结构类型密切相关,且与岩电参数的变化范围具有对应性.以上不同孔隙结构岩电参数变化规律的分析为准确理解和应用实际岩电参数提供了依据.
Archie equation is a classical equation calculating oil saturation quantitatively by using well logging information,which plays a significant role in well logging interpretation.The rock-electro parameters a,b,m,n,F and I are six important parameters in Archie equation. The recent investigations of pore structure in low permeability reservoir are found to have direct impact on the accuracy of reservoir productivity evaluation and prediction. However,in the present rock-electro experiment of low permeability reservoir,only the few of rock-electro parameters are analyzed,without comprehensively and systematically studying the six rockelectro parameters a,b,m,n,F,I and their change rules from a perspective of the pore structure types.Thus,this study analyzed the change rules of the six rock-electro parameters in different pore structure types in low permeability sandstone reservoirs of the second member of Xujiahe Formation in Anyue district of Sichuan province,as well as their relationships with reservoir productivity,by using high pressure diaphragm rock-electro experiment combined with mercury injection and nuclear magnetic resonance data.The result revealed that different pore structure types,from typeⅠto type Ⅳ,showed different variation ranges of rock-electro parameters a,b,m,n,Fand I.As for pore structure typeⅠto typeⅣ,the variation ranges of a,nand F were increasing,while the variation ranges of b and m were decreasing.The productivity of low permeability reservoir was also closely related to the pore structure types：generally,the better the pore structure type,the larger the gas production.And the productivity of low permeability reservoir had a good correspondence to the variation ranges of rock-electro parameters as well.By the process of actual rock-electro data of some wells,it was found the result had a good relationship withthe formation test and physical peoperty analysis.The above analysis of change rules of rock-electro parameters in different pore structure type provided the basis for a
出处
《地球物理学进展》
CSCD
北大核心
2015年第4期1763-1771,共9页
Progress in Geophysics
基金
国家十二五重大专项"复杂储层油气测井解释理论方法与技术处理"(2011ZX05020-008)
国家自然科学基金项目"致密砂岩储层成岩相测井识别方法研究"(41472115)联合资助
关键词
岩电实验
孔隙结构
变化规律
低渗储层
储层产能
须家河组二段
安岳地区
Keywords rock electro experiment
pore structure
change rule
low permeability reservoir
reservoir productivity
the second member of Xujiahe formation
Anyue district
