摘要
鄂尔多斯盆地中西部马家沟组浅水碳酸盐沉积体系可分为滩相、开阔台地相、局限台地相和蒸发台地相等四个相带 ;本文主要讨论了该地区不同相带的有机质丰度、可溶有机质族组成及其生物标志化合物特征。研究表明 ,局限台地相有机质丰度相对较高 ,富含饱和烃和芳烃 ,正构烷烃轻组分含量相对较高 ;滩相有机质丰度相对较低 ,富含非烃和沥青质 ,正构烷烃重组分含量相对较高。这与局限台地相有利于有机质保存的水动力条件和烃类运移有关。研究表明局限台地相生烃潜力较高 ,是油气源岩良好的分布区 ,而滩相为颗粒灰岩 ,孔隙发育 ,非烃和沥青质所占比重较大 。
Sedimentary system of early Ordovician shallow carbonate in middle-western area of Ordos basin may be classified into beach facies, open platform facies, restricted platform facies and evaporated platform facies. This paper had made analyses on abundance of organic matter, group composition of chloroform bitumen (A+C), characteristics of saturated hydrocarbons gas chromatography of different environment. It is found that organic matter in restricted platform facies has rich abundance of organic matter and has rich saturated hydrocarbons and aromatic hydrocarbons, organic matter in beach facies is on the contrary. Finally based on the study of the characteristics of organic geochemistry in the middle-western part of Ordos basin, it has been preliminarily concluded that carbonate rock on restricted platform facies is better oil source beds.
出处
《新疆石油学院学报》
2003年第3期1-4,共4页
Journal of Xinjiang Petroleum Institute
关键词
有机地化
沉积相
生物标志化舍物
碳酸盐岩
鄂尔多斯盆地
Orgainc geochemistry
carbonate rock
Biomarker
Organic matter content
Sedimentary facies
Ordos basin
