摘要
塔里木盆地柯坪剖面中上奥陶统萨尔干组(O2-3s)为一套厚13.4m的夹灰色薄层状或透镜状灰岩的黑色页岩沉积,黑色页岩有机碳含量0.65%～2.83%,平均为1.63%.黑色页岩的累计厚度约在11～12m,有机质类型为Ⅱ型,有机质主要源于藻类和疑源类,黑色页岩的等效镜质组反射率值为1.58%～1.61%.其形成与中奥陶世庙坡期(相当于Caradoc期)全球性缺氧事件有关,表现为碳同位素明显地正向偏移,推测这一阶段与缺氧事件有关的高丰度源岩在塔里木盆地分布广泛,为塔里木盆地重要的烃源岩层段。
The Salgan formation of Middle-Upper Ordovician in Keping outcrop of Tarim basin is characterized by black shale deposit of 13.4 m in thickness intercalated with minor thin or lenticular limestone, with TOC of 0.65%-2.83%, averaging 1.63%, the total thickness of about 11 -12 m, the organic matter of Type-II mainly originated from algae and aeritarch. The equivalent vitrinite reflectance ranges from 1.58% to 1.61%. Its shape was related to global anoxie event of Caradoe period of Middle-Late Ordovician, with significant positive carbon isotopic excursion of carbonate. It is postulated that source rocks related to this event are widespread as major hydrocarbon source rocks in Tarim basin.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2008年第6期687-689,共3页
Xinjiang Petroleum Geology
