为了明确柴达木盆地北缘中侏罗世晚期气候逐渐干热条件下页岩的有机质富集机制，文章通过对鱼卡地区多口钻井大煤沟组七段页岩样品进行有机地球化学、无机地球化学及矿物组成测试等方法，系统分析了古气候纵、横向变化特征及其与有机质的供给和保存的关系，结果表明，与下部灰黑色页岩相比，上部灰褐色页岩整体具有较高的有机质丰度及偏腐泥型的有机质类型；偏高的碳酸盐矿物含量、Sr/Cu及整体偏小但变化范围较大的古气候指数C值反映高频波动的逐渐干热化气候演化特征；横向上，灰褐色页岩差异显著的C值反映同一时期的气候也呈现出一定不稳定性；较低的Al与Ti含量指示较弱的陆源碎屑输入；较高的P/Ti与Ba/Al指示较高的古生产力；较低的Pr/Ph和较高的黄铁矿含量指示偏还原的水体条件；较高的Sr/Ba和多数偏高的伽马蜡烷指数反映水体偏咸化且在大部分区域形成了水体分层。综合参数特征可得，一定程度的气候干热化会导致陆源物质输入减少、古生产力提高、水体还原性增强及盐度增加、大部分区域水体出现分层等，为偏腐泥型有机质的富集提供了有利条件。

In order to clarify the accumulation mechanism of organic matter in shale under the gradually arid palaeoclimate in the Late of Middle Jurassic for Northern Qaidam Basin, this paper systematically analyzed the palaeoclimate characteristics and its relation with the supply and preservation of organic matter by means of organic geochemistry, inorganic geochemistry and mineral composition analysis of shale samples for Seven Member of Dameigou Formation from some wells in Yuqia area. Compared with the lower gray-black shale, the upper gray-brown shale is characterized by higher organic matter content and sapropelic organic matter type. The higher contents of carbonate minerals and Sr/Cu, and the lower palaeoclimate index C value, with wide range, indicate gradually arid palaeoclimate with high frequency fluctuation. Apparent difference of C value for gray-brown shale in lateral direction reflects that the palaeoclimate at the same period is also stable. Lower Al and Ti contents indicate weak input of terrigenous detrital matter. Higher P/Ti and Ba/Al indicate higher palaeoproductivity. Lower Pr/Ph and higher pyrite content indicate more reducing water conditions. Higher Sr/Ba and mostly high gammacerane index reflect water salinization of the lake and water stratification in most areas. Based on the above proxies, it can be concluded that a certain degree of arid palaeoclimate is favorable to the decrease of terrigenous matter input, the increase of palaeoproductivity, the enhancement of water reducibility and salinity, and the stratification of most areas, which can facilitate sapropelic organic matter accumulation.