河套盆地生物气源岩有机地球化学特征及其天然气生成演化模式  

Organic Geochemical Characteristics of Biogas Source Rock and Its Evolution Patterns of Gas Generation in Hetao Basin

作　　者：孔庆芬[1] 李剑锋[1] 吴凯[1] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院

出　　处：《低渗透油气田》2008年第1期51-56,共6页

摘　　要：通过天然气组分与甲烷碳同位素特征分析，证实河套盆地第三系上新统一第四系更新统确有生物气存在。详细的有机地化分析资料显示，第三系上新统一第四系更新统生物气源岩的有机物质含量丰富，干酪根类型以Ⅱ2、Ⅲ型为主，有机质演化正处于生化甲烷阶段，非常利于生物气的形成。另外，文章在建立生物气生成演化模式的基础上，结合温度对生物气形成的影响，提出河套盆地生物气生成的最佳深度范围为685～926m，位于第四系更新统中段．Through analysis of characteristics of gas composition and carbon isotopic composition of the methane, it has been confirmed that there is bio-gas sources in Pliocene （N2） - Pleistocene （QI-3） in Hetao basin. Detailed analysis data of organic geochemistry show that the organic matter content is rich in the bio-gas sources in Pliocene （N2） - Pleistocene （Q1-3）. Its kerogen types are mainly type II 2 and HI. The evolution of their organic matter is at a methane stage of biochemistry, being very conducive to the formation of biogas. In addition, on the basis of establishment of bio-gas generation and evolution models, with the impact of temperature on the formation of the biogas, the authors put forward in the article that the best depth for the biogas generation is 685-926m in the basin, locating on the mid- dle interval of Pleistocene of the Quaternary.

关 键 词：河套盆地 生物气 有机地球化学特征 干酪根 生气演化模式 

分 类 号：P618.130.1[天文地球—矿床学]