中国东部陆相下第三系盐湖相的沉积类型及其油源岩特征

SEDIMENTATION TYPES AND CHARACTERISTICS OF SOURCE ROCKS IN THE PALEOGENE SALT LAKE FACIES IN EASTERN CHINA

吴德云 王荣新 张国防

Wu Deyun Wang Rongxin Zhang Guofang

河南石油勘探开发研究院, 南阳 473132

Henan Reasearch Institute of Petroleum Exploration and Development

中国东部陆相下第三系盐湖相的油气勘探实践证明,在同一含盐湖盆内油源岩存在着正常型、交替型、侧异型三种沉积类型。盐湖相油源岩有机质丰富,母质类型多为Ⅱ型,热演化程度低,石油密度大,烃含量低,非烃和硫含量高,在烃类组成中有很大的植烷优势,甾、萜烷系列化合物中生物构型和γ-蜡烷较丰富。 本文对三种沉积类型的勘探实例进行了剖析。

The petroleum exploratory practice in Paleogene non-marine lacustrine facies,eastern China proved that the source rocks in the same salt-bearing lake basin can be classified into three sedimentation types i. e. normal,alternative,lateral variation types. Furthermore the source rocks of saline-lake facies are characterized by abundant organics,with type Ⅰ kerogen,low thermal evolution,high density of crude oil,low content of hydrocarbon,high content of non-hydrocarbon and sulfur. As for the compositions of hydrocarbons,there is a high predominance of phytanes with a series of sterane and terpane compounds rich in biological configurations and gamma cerotane. The three sedimentation types with exploration cases are analysed in detail.

https://doi.org/10.11781/sysydz199303272