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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.
Tight sandstone reservoirs have the characteristics of poor physical properties and poor pore structure, logging interpretation is faced with the difficulty of large differences in productivity between low-resistance gas reservoirs, high-water-resistance layers and similar physical properties.According to porosity The method of determining the fluid properties by resistivity, resistivity and resistivity completely fails, and the combination of the well-defined logging well and the array gas wave “gas-bearing indicator” also has low coincidence rate, which restricts the exploration and development of tight gas. The fluid properties of the reservoir, taking the Upper Paleozoic tight sandstone in the Linxing-Shenfu area of the Ordos Basin as the research object, the conventional Archean formula is used as the theoretical basis to excavate the conventional well logging data. Density porosity and resistivity measurements The regression analysis of the gas, water and dry layers that have been tested respectively and the correlation coefficient of the power function are obtained. The analysis results show that the correlation between density porosity and resistivity logging is poor in gas-bearing reservoirs , While the correlations between the reservoir layers tested for the dry layer and the water layer are good. The density porosity of the aqueous layer and the water-dried layer have a negative correlation with the resistivity, while the dry layer with the gas has a positive correlation. On this basis, Pass right The density porosity and resistivity of the 24 strata that have been tested in the study area are regressed and statistically analyzed.The statistical results show that the correlation coefficient of dry layer and water layer is above 0.2 and the correlation coefficient of industrial gas layer is less than 0.2 Tight sandstone logging interpretation work has achieved good results, greatly improving the interpretation of the coincidence rate.