一种定量评价致密砂岩储层流体性质的新方法——相关系数法

发布时间：2018-01-10 07:30

本文关键词：一种定量评价致密砂岩储层流体性质的新方法——相关系数法　出处：《地球物理学进展》2017年05期 　论文类型：期刊论文

【摘要】：致密砂岩储层具有物性差、孔隙结构差的特点,测井解释面临着低阻气层、高阻水层以及相似物性条件下产能相差大的难点.常规碎屑岩储层中使用的根据孔隙度及电阻率判断流体性质的方法完全失效,经典的定性的测录井结合及阵列声波"含气指示"法也符合率较低,制约了致密气的勘探及开发.为了明确致密砂岩储层的流体性质,以鄂尔多斯盆地临兴神府地区上古生界致密砂岩为研究对象,通过对常规测井资料深入挖掘,以经典的阿尔奇公式为理论依据,使用密度孔隙度与电阻率测井分别对已经测试的气层、水层及干层进行回归分析,求取幂函数的相关系数.分析结果表明:在产气的储层中,密度孔隙度与电阻率测井相关性较差,而测试为干层和水层的储层则相关性较好;水层及含水干层密度孔隙度与电阻率具有负相关性,而含气干层具有正相关性;在此基础上,通过对研究区已经测试的24个层位的密度孔隙度与电阻率进行回归分析并进行统计.统计结果显示:干层及水层相关系数在0.2以上,而工业气层相关系数小于0.2.该方法在致密砂岩测井解释工作中取得了很好的效果,大大提高了解释的符合率.
[Abstract]:Tight sandstone reservoirs are characterized by poor physical properties and poor pore structure, and logging interpretation is faced with low resistivity gas reservoirs. The difficulty of large productivity difference in high resistivity reservoirs and similar physical properties. The method used in conventional clastic rock reservoirs to judge the properties of fluids based on porosity and resistivity is completely ineffective. The classical qualitative logging combination and array acoustic "gas indication" method also have a low coincidence rate, which restricts the exploration and development of dense gas, in order to determine the fluid properties of tight sandstone reservoir. Taking the Upper Paleozoic tight sandstone in Linxing Shenfu area of Ordos Basin as the research object, the conventional logging data are deeply excavated and the classical Archie formula is used as the theoretical basis. The correlation coefficient of power function is obtained by regression analysis of gas reservoir, water layer and dry layer tested by density porosity and resistivity logging. The results show that the correlation coefficient of power function is obtained in gas-producing reservoir. The correlation between density porosity and resistivity logging is poor, but the correlation between dry layer and water reservoir is better. There is a negative correlation between density porosity and resistivity in water layer and dry layer with water content, but a positive correlation between density porosity and resistivity in dry layer containing gas. On this basis, the correlation coefficient of dry layer and water layer is more than 0.2 through regression analysis and statistical analysis of density porosity and resistivity of 24 horizons that have been tested in the study area. The correlation coefficient of industrial gas reservoir is less than 0.2. This method has achieved good results in the interpretation of tight sandstone logging and greatly improved the interpretation coincidence rate.
【作者单位】：中海油田服务股份有限公司油田技术事业部;自贡市国土资源局;西南石油大学;中国石油天然气股份公司青海油田采油一厂;
【分类号】：P618.13
【正文快照】： 0引言临兴神府地区隶属于鄂尔多斯盆地东北缘,勘探层位主要为上古生界石炭系—二叠系致密砂岩储层.致密气储层与常规碎屑岩储层不同,具有岩石成分复杂,孔隙度及渗透率极低的特点(邹才能等,2012;蒋平等,2015;赖锦等,2015;马东旭等,2016).测井解释面临着气层、水层电性特征不明

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