柴达木盆地北缘侏罗系由非海相冲积—三角洲及湖泊沉积体系构成。托阿尔阶的沉积序列为下部的冲积体系向上过渡为滨浅湖、中深湖沉积体系 ,后者发育一系列在垂向上向上变粗—变浅的旋回层并构成准层序。在准层序级别 ,有机相参数发生规律性变化。岩石的有机质含量向上增加 ,显示与粉砂质含量呈正相关。其原因可能是冲积物源的植物碎屑和粉砂颗粒具有相似的水动力均衡条件。有机母质具有高等陆生植物和低等水生生物输入的双重旋回特征。成熟度居于临界状态 (镜质体反射率平均 0 .57% )。自生的黄铁矿 /菱铁矿比与沉积物堆积速率之间存在一定的联系。湖泛面位于准层序的下部且直接上覆高有机质的暗色泥岩 The Jurassic in the northern margin of the Qaidam basin consists of non-marine alluvial-deltaic and lacustrine sedimentary systems. Sedimentary sequence of the Tuoerde sequence is that the lower alluvial system transitions upwards to a shallow lake and mid-deep lake sedimentary system, in which the latter develops a series of upwardly thicker-shallower cyclotrices and constitutes a quasi-sequence. At the quasi-sequence level, the organic phase parameters change regularly. The organic matter content of the rock increased upward, showing a positive correlation with the silty content. This may be due to the fact that plant debris and silt particles from the alluvial source have similar hydrodynamic equilibrium conditions. Organic parent material has dual gyration characteristics of higher terrestrial plants and lower aquatic inputs. Maturity in the critical state (vitrinite reflectance average 0.57%). There is a certain relationship between spontaneous pyrite / siderite ratio and sediment accumulation rate. The lake flooding surface is located in the lower part of the quasi-sequence and is directly covered with dark organic mudstone