Fischer曲线在古气候研究中的应用——以车镇凹陷古近系沙三段为例

以车镇凹陷古近系沙三段为目标层位，选取车57井作为参照井，利用沉积岩特征在地层中垂向的旋回变化，结合Fischer曲线探讨了沙三段沉积时期古气候的变化规律及其对可容纳空间的控制作用。研究表明，车镇凹陷古近系沙三段沉积时期整体上为1个湿一干的二级气候旋回，3个干一湿的三级气候旋回和20个干一湿的五级气候旋回，古气候控制了沙三段沉积时期可容纳空间变化，伴随着古气候环境的变迁，湖平面呈现有规律的旋回变化。

The application of Fishcher curves on paleoclimate research——taking the third member of Shahejie Formation in Chezhen Sag as an example

Taking the third member of Shahejie Formation of Chezhen Sag as the aim layer,and selecting the Che 57 as a reference well, and depending on the lengthways cyclic changes of sedimentary rocks,the evolution of palaeoclimate and the controlling factors during the third member of Shahejie Formation in Chezhen Sag are discussed by using Fischer curves. The result shows that there were one wet - dry second level climate cycle,three dry -wet third level climate cycle and twenty dry - wet fifth level ones in Shahejie Formation in Chezhen Sag. The palaeoclimate controlled the accommodation change of Shahejie Formation inChezhen Sag. The lake surface had regular cycle changes withthe palaeoclimate and environment changes.