周尚文,王红岩,刘浩,郭伟,陈浩
Zhou Shang-wen,Wang Hong-yan,Liu Hao,Guo Wei,Chen Hao
摘要: 含气量是页岩气储层评价的关键参数,其准确测试是计算地质储量和确定开发方案的基础。为了准确计算页岩含气量测试中的损失气量,引入经典的Arps产量递减分析方法进行了页岩含气量的分析,建立了一种基于Arps产量递减模型的页岩损失气量计算新方法。气体解析速率递减曲线与气井产量递减曲线较为类似,应用双曲递减模型、指数递减模型及调和递减模型对其进行非线性拟合,分析表明调和递减模型的拟合效果较差,双曲递减和指数递减模型拟合效果均较好。并与常用的USBM直线法和多项式法进行了对比,发现Arps指数递减模型的计算结果均介于直线法和多项式法计算结果之间,计算结果更为准确、合理。在取心方式和计算方法确定的情况下,损失时间的确定是含气量计算中最重要的影响因素,分析认为目前的损失时间确定方法是不准确的,需结合现场实际情况进一步研究。
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