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为定量表征泥页岩含气性,用解析法和测井法分别测定鄂尔多斯盆地中南部地区上古生界二叠系山西组泥页岩含气量,并对这2种方法的准确性和实用性做了对比和讨论。结果表明:解析法测定总含气量为1.189cm3/g,测井法得出的总含气量为0.958cm3/g,二者得出的结果基本一致。解析法可以通过分析测试实验直接测量泥页岩含气量,但只能确定取样井段含气量,而且测量结果易受取心方式及时间长短的影响。测井法可以确定全井段含气量,但应根据大量分析实验数据,选取合适的参数,才能建立可靠的数据计算模型。这2种方法对确定泥页岩含气量都有各自的优势,互为补充,二者结合可以为确定泥页岩含气量及有利区优选提供可靠依据。
In order to quantitatively characterize the gas content of shale, the gas content of shale in the Permian Shanxi Formation in the Upper Paleozoic in central-southern Ordos Basin was determined by analytic method and logging method. The accuracy and practicability of these two methods Made a comparison and discussion. The results show that the total gas content measured by the analytical method is 1.189cm3 / g, and the total gas content obtained by the logging method is 0.958cm3 / g. The results obtained are basically the same. The analytic method can directly measure the gas content of shale by analyzing and testing experiments, but can only determine the gas content of the sampling well section, and the measurement results are easily influenced by the coring method and the length of time. Logging method can determine the gas content of the whole well section, but a reliable data calculation model should be established based on analyzing a large amount of experimental data and selecting appropriate parameters. Both of these two methods have their own advantages in determining the gas content of shale, complementing each other. The combination of the two methods can provide a reliable basis for determining the gas content of shale and the optimization of favorable areas.