四川盆地龙马溪组页岩气地球化学特征及其地质意义

被引：46

作者：

高波 ^{[1
,2
]}

机构：

[1] 中国石化石油勘探开发研究院

[2] 中国石化页岩油气勘探开发重点实验室

来源：

天然气地球科学 | 2015年 / 26卷 / 06期

关键词：

四川盆地; 龙马溪组; 页岩气; 组分; 稳定同位素;

D O I：

暂无

中图分类号：

P618.13 [石油、天然气];

学科分类号：

070403 [天体物理学];

摘要：

四川盆地下志留统龙马溪组是目前我国页岩气勘探开发的重点领域。在对四川盆地源自龙马溪组的石炭系黄龙组天然气和龙马溪组页岩气的组分及同位素进行对比分析的基础上,对龙马溪组页岩气中烷烃气碳、氢同位素组成倒转的原因进行了探讨。龙马溪组页岩气中CH4含量占95.52%99.59%,平均为98.54%;C2H6含量占0.23%0.72%,平均为0.48%;C3H8含量占0%0.03%;干燥系数C1/C1-5>0.99,表明龙马溪组页岩气为典型的干气;δ13 C1值介于-37.3‰-26.7‰之间,δ13C2值介于-42.8‰-31.6‰之间,δ13 C3值介于-43.5‰-33.1‰之间,呈现出油型气特征,但烷烃气碳同位素均发生了倒转,表现为δ13 C1>δ13 C2;大部分页岩气烷烃气氢同位素也发生了倒转,表现为δD1>δD2。通过与国外页岩气地球化学对比分析,四川盆地龙马溪组页岩气与美国Fayetteville等高成熟度页岩气相似,主要为过成熟阶段的干酪根裂解气与页岩中早期形成的可溶有机质裂解成气的混合产物,具有页岩气富集高产的物质基础。

引用

页码：1173 / 1182

页数：10

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