青海湖布哈河口区表层沉积物有机质分析及其比较沉积学意义

发布时间：2018-05-19 20:31

  本文选题：有机碳 + 干酪根　； 参考：《湖泊科学》2017年05期

【摘要】：青海湖布哈河口区与晚三叠世鄂尔多斯盆地及四川盆地具有相似的古地理特征和水体环境,对布哈河口区表层沉积物中有机质的类型和丰度进行研究具有重要的比较沉积学意义.通过对布哈河口区河流、三角洲平原、前三角洲、滨湖、浅湖及半深湖环境表层沉积物样品全岩组分、总有机碳(TOC)及有机质类型进行分析,确定布哈河口区表层沉积物中有机质主要为Ⅱ2型和少量Ⅱ1型,TOC含量不超过4.29%,其中半深湖TOC含量最高并且有机质类型较好.布哈河口区表层沉积物中TOC含量主要受黏土矿物含量、有机质生产力和水深控制,半深湖沉积物具有较高的黏土矿物含量、较高的有机质生产力、较好的有机质类型和较大的覆水深度,有利于有机质的生产和保存,为河口区最有利于烃源岩发育的环境.同时,根据前三角洲、浅湖及半深湖沉积物中TOC含量与水深存在良好的相关性,建立了利用岩石中TOC含量对古水深进行恢复的公式.
[Abstract]:The Buha River mouth area of Qinghai Lake has similar paleogeographic characteristics and water environment to the late Triassic Ordos Basin and Sichuan Basin. It is of great significance to study the types and abundance of organic matter in surface sediments of Buha River estuary. The total rock components, total organic carbon (TOC) and organic matter types of surface sediment samples in the environment of Buha River Estuary, delta plain, pre delta, littoral lake, shallow lake and semi deep lake were analyzed. It is determined that the content of organic matter in surface sediments of Buha River estuary is mainly type 鈪，

本文编号：1911557