摘要
福海盆地乌伦古湖北一带早石炭世那林卡拉组发现一套稳定且厚度较大的烃源岩层位。从纵横向及深部展布、有机质丰度、类型及热演化特征等方面分析该烃源岩有机地化特征。烃源岩出露长约240 km,厚214~1281 m,钻孔显示向深部延伸稳定,岩性以黑色粉砂质泥岩为主。探槽及钻孔样品总有机碳(TOC)含量平均为6.95%和4.57%,干酪根类型以Ⅱ_(1)型为主,Ⅱ_(2)型次之,镜质体反射率(Ro)平均1.19%。表明烃源岩整体处在成熟-高成熟阶段,以成熟阶段为主。该区域烃源岩主要形成于较稳定的滨浅海环境。早石炭世古地理环境以滨浅海相为主,说明该时期形成大面积烃源岩的可能性较大。
A set of stable and thick source rock strata was found in the Early Carboniferous Nalinkala formation in the north of Wulungu Lake in Fuhai Basin.The organic geochemistry characteristics of the source rocks were analyzed from the aspects of vertical distribution and deep distribution,organic matter abundance,type and thermal evolution.The source rock is about 240 km in length and 214~1281 m in thickness.The borehole shows stable extension to the deep,and the lithology is mainly black silty mudstone.Exploratory trench and borehole samples of total organic carbon(TOC)content of 6.95%and 4.57%on average,the kerogen type is given priority to with Ⅱ_(1),Ⅱ_(2) times,vitrinite reflectance(Ro),an average of 1.19%,that whole hydrocarbon source rocks in the mature to high mature stage,give priority to with mature.The source rocks in this region were mainly formed in the stable littoral and shallow sea environment,while the northern Xinjiang was dominated by littoral and shallow sea in the early Carboniferous palaeogeographic environment,indicating that the possibility of forming large area source rocks in this period is greater.Carboniferous Nalinkala Forma-tion can be used as a new strata for oil and gas investigation and has a good resource prospect.
作者
舍建忠
贾健
段旭杰
雷国民
冯琛伟
曹江宇
冯长丽
She Jianzhong;Jia Jian;Duan Xujie;Lei Guoming;Feng Chenwei;Cao Jiangyu;Feng Changli(Xin jiang geology survey institute.Urumqi,Xinjiang,830000,China;Xinjiang Uygur Autonomous Region Bureau of Geology and Mineral Resources.Urumqi,Xinjiang,830000,China)
出处
《新疆地质》
CAS
CSCD
2021年第2期286-291,共6页
Xinjiang Geology
基金
准噶尔北缘烃源岩(油气)基础地质调查评价(N17-2-XJ14)资助。
关键词
福海盆地
石炭系
烃源岩
乌伦古湖
那林卡拉组
Fuhai Basin
The carboniferous.Hydrocarbon source rocks
Wulungu Lake
Narinkala group
