摘要
在华北地台东部(鲁西)、中部(晋中)和鄂尔多斯盆地,二叠系太原组煤系形成于海侵体系域成煤环境,山西组煤系则主要形成于陆相高位体系域的三角洲成煤环境。这两种环境下形成的煤在硫含量及其赋存形态、有机显微组分组成等地球化学特征方面存在较大差异太原组煤中总硫含量比山西组煤高,太原组煤中硫的赋存形态以黄铁矿硫为主,山西组煤以硫酸盐硫为主。有机显微组分中,太原组煤的镜质组平均含量高,且以基质镜质体为主,惰性组平均含量低;山西组煤的镜质组平均含量相对低,且其中的基质镜质体平均含量远低于太原组,惰性组平均含量却比太原组煤高。太原组煤的凝胶化指数值较大,而植物结构保存指数值较小;山西组煤则凝胶化指数值较小而植物结构保存指数值较大。从煤成烃角度出发,太原组煤系优于山西组,太原组煤系应是华北地台最有利的生烃层系。
In the eastern and central parts of North China Platform and Ordos Basin, the coal series in Taiyuan Formation are formed in a coal depositional environment of a transgressive system tract while those in Shanxi Formation is deposited mainly in a terrestrial delta coal-forming environment of a highstand system tract. Coals formed in the two depositional environments are quite different in organic-geochemical features, such as sulfur content, sulfur molecular configurations and macerals. Sulfur is more abundant in Taiyuan Formation than in Shanxi Formation. In Taiyuan Formation, sulfur is mainly in the form of pyrite sulfur, while in Shanxi Formation sulfur is chiefly in the form of sulfate. The coal macerals in the Taiyuan Formation are of high average vitrinite content, mainly desmocollinite, and low average inertinite content, while that in the Shanxi Foramtion are of lower average vitrinite content and much lower desmocollinite content, but of higher inertinite content. The Taiyuan Formation coal is high in GI （Gelification Index） but low in TPI （Texture Preservation Index）, while the Shanxi Formation coal is lower in GI but higher in TPI. The transgressive Talyuan Formation coal series should be the best hydrocarbon-generating deposit in the studied area.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2005年第4期142-146,共5页
Petroleum Exploration and Development
基金
中国石油天然气股份有限公司"十五"重点科技攻关项目"中国北方油气区石炭二叠系划分对比
古环境研究及含油气远景评价"专题之一
关键词
海侵体系域
高位体系域
煤沉积模式
煤显微组分
凝胶化作用
transgressive system tract
highstand system tract
coal depositional model
coal mecerals
gelification
