致密砂岩气含量试验测试技术

Test technology on gas content of tight sandstone gas

为了准确对致密砂岩气储层参数有更加全面透彻的认识,采用非常规天然气的气含量解吸法和等温吸附试验对致密砂岩气储层参数进行测试分析,测得鄂尔多斯盆地东北部致密砂岩气井气含量参数值与等温吸附常数。同时,研究了砂岩气储层特征和砂岩气含量试验测试技术方法。结果表明:鄂尔多斯东北部致密砂岩气井所采平均气含量为9.94 cm3/g;根据致密砂岩气储层的等温吸附常数与储层压力得出砂岩含气饱和度为57.8%,临界解吸压力为7.26 MPa.作为现阶段测试砂岩气参数指标的主要手段和方法,砂岩气储层气含量实验测试和等温吸附特征得出的砂岩气参数为勘探区砂岩气资源评价提供了比较基础数据,对砂岩气勘探开发有重要的指导意义。

In order to understand the reservoir parameters of the tight sandstone accurately and complete- ly, the desorption methods and isothermal adsorption experiment were adopted to measure reservoir pa- rameters. Then the tight sandstone reservoir parameters and isothermal adsorption constant were obtained in northeast of Ordos Basin. Meanwhile, the test technology method of gas content and the reservoir char- acteristics were researched. The test results show that：the average gas content of the northeast of Ordos sandstone gas wells was 9.94 cm3/g. According to isothermal adsorption constant and reservoir pressure, gas saturation was 57.8 % and critical desorption pressure was 7.26 MPa. The sandstone gas parameters gave the basic data for resource evaluation of sandstone gas, and has important significance for explora- tion and development of sandstone gas.