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页岩气赋存形式和初始原地气量(ogip)预测技术

Keywords: 页岩气,初始原地气量(ogip),游离气,吸附气,溶解气,油气系统模拟

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Abstract:

?页岩气有利区或核心区评价的关键是确定页岩初始原地气量(ogip)的空间分布,页岩气赋存形式介于致密砂岩气与煤层气之间,主要呈3种状态:孔隙中游离气、固体有机质吸附气、油和水中溶解气,温度和压力条件控制3种状态气体的量和相互转化。游离气量主控因素是页岩孔隙度和气体饱和度,吸附气量主控因素是有机质数量和有机质成熟度,溶解气量的主控因素是页岩中残留油的数量。提出了页岩气中游离气量、吸附气量和溶解气量的算法,并在油气系统模拟软件trinity3d中实现页岩气ogip量空间分布计算,以fortworth盆地barnett页岩为例展示了这一技术的实际应用。

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