摘要
焉耆盆地是中国西部众多中新生代小型含煤盆地之一。该盆地侏罗系煤系烃源岩主要分布于博湖坳陷,组成了侏罗系含油气系统。通过对焉耆盆地多口井样品分析的显微组分的定量统计和各种煤相参数的研究,发现研究区煤岩具有较高的凝胶化指数和低的植物组织保存指数,说明大部分煤岩形成于水体流动性不强的还原环境。根据煤系有机相研究分析,可以划化分为干燥泥炭沼泽相、潮湿森林泥炭沼泽相、过渡边缘沼泽相、活水泥炭沼泽相和开阔水体相五种有机相。研究指出,水进序列的含煤建造是焉耆盆地煤系烃源岩成烃的有利环境。
Ya nqi basin is one of the small coal-bearing basins of Mesozoic and Cenozoic in West China.Since1993,two oil-gas fields with four oil-bearing blocks h ave been found successively.The Jurassic source rocks in coal measure strata ar e mainly distributed in Bohu depression,forming Jurassic petroleum system.Thro ugh quantitative statistics of petroleum micro-constituents from wells by sampl e analysis and study of various coal-measure facies parameters in Yanqi basin ,it is found that they are high in gelation index and low in plant tissues res toring index,proving that most coal measures are formed reducing environment w ith weak water mobility.The coal measure facies can be divided into five ones s uch as dry peat marsh,moist forest peat marsh,transitional margin marsh,livin g water peat marsh and open water facies.It is pointed out that the coal-bear ing formation in transgressing sequences is favorable environment for hydrocarb on generation in Jurassic coal measure source rocks in Yanqi basin.
出处
《新疆石油地质》
CAS
CSCD
2004年第1期41-43,共3页
Xinjiang Petroleum Geology
关键词
侏罗纪
煤系烃源岩
有机相
显微组分
Xinjiang
Yanqi basin
Jurassic
source rock
organic facies
