泌阳凹陷湖相碳酸盐岩中的三环二萜烷及其热演化  

Evolution of tricyclic terpanes in the lacustrine carbonatesfrom Biyang Depression

作　　者：妥进才[1,2] 曾凡刚[1,2] 黄杏珍[1,2] 

机构地区：[1]中国科学院兰州地质研究所 [2]北京大学地质系

出　　处：《地球化学》1999年第1期34-41,共8页Geochimica

基　　金：国家自然科学基金

摘　　要：从泌阳凹陷下第三系湖相碳酸盐岩中检测到了丰富的并以成对分布为特征的三环二萜烷。整个碳酸盐岩剖面中有机质类型均以Ⅰ型为主，成对分布的三环二萜烷中１３α（Ｈ），１４α（Ｈ）异构体向热稳定性更高的１３β（Ｈ），１４α（Ｈ）异构体转化，其含量随埋深的增加而减少。据此提出可以三环二萜烷热演化参数ＴＣＴ，即αα构型向βα构型转化率来表征未成熟和低成熟生油岩中有机质的热演化程度。Abundant and pairly distributed tricyclic terpanes are detected for the Tertiary lacustrine carbonates from Biyang Depression. All of the organic matters from t he whole carbonate profile are of type Ⅰ, but the distributive characteristics of tricyclic terpanes varied regularly with burial depth of samples. The content s of 13α(H),14α(H) isomers in the pairly distributed tricyclic terpanes decrea sed sharply with the increase of depth. So the tricyclic terpane maturity parame ters (TCT) can well reflect the thermal maturity degrees of organic matters in i mmature and lower mature source rocks.

关 键 词：碳酸盐岩 三环二萜烷 TCT参数 生油岩 油矿床 

分 类 号：P618.130.2[天文地球—矿床学]