珠江口盆地早第三纪油源岩形成环境  

Original Environment of Eogene Petroleum Source Rocks in the Pearl River Mouth Basin

作　　者：江德昕[1] 杨惠秋[1] 

机构地区：[1]中国科学院兰州地质研究所,兰州730000

出　　处：《沉积学报》2000年第3期469-474,共6页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目!(批准号 :R850 879)资助

摘　　要：记述了南海北部大陆架珠江口盆地上渐新统珠海组 (E3 3 )储油层所储原油中萃取出的孢子花粉化石 2 5属47种 ;基于原油中孢粉化石及其地层分布的研究确定了该含油盆地下第三系油源岩 ;并根据孢子花粉母体植物的古生态特征探讨了早第三纪油源岩形成的环境。研究结果表明 ,中始新统文昌组 (E2 2 )和上始新统至中渐新统恩平组(E2 3 -E3 2 )暗色泥质岩是珠江口盆地的油源岩 ,研究区油源岩形成于亚热带温暖潮湿气候下的湖泊沉积环境。Forty seven species of fossil spores and pollen referred to 25 genera extracted from the crude oil samples collected from the reservoirs within the Upper Oligocene Zhuhai Formation in the Pearl River Mouth Basin of the North Continental Shelf of South China Sea were recorded in this paper. Based on the investigations of the spores and pollen in crude oil and their stratigraphical distribution, the Eogene petroleum source rocks of the petroliferous basin were determined. In accordance with the paleoecological characteristics of the original plants producing the spores and pollen, the sedimentary environment of the Eogene petroleum source rocks was discussed. The results of the study indicate that the black and dark grey clayrocks of the Middle Eocene Wenchang Formation and the Upper Eocene to Middle Oligocene Enping Formation should be the petroleum source rocks of the Pearl River Mouth Basin; and the petroleum source rocks might have originated and evolved in the subtropic lacustrine sedimentary environment under warm and wet climatic conditions.

关 键 词：孢子花粉 油源岩 沉积环境 下第三系 珠江口盆地 

分 类 号：P618.130.1[天文地球—矿床学]