渤中凹陷古近系层序格架内的成岩作用

Diagenesis in sequence stratigraphic framework of Paleogene strata in Bozhong Depression

谢武仁 邓宏文 王洪亮 徐长贵

谢武仁1，邓宏文2，王洪亮2，徐长贵3

(Langfang Branch of Research Institute of PetroleumExploration and Development,CNPC, Langfang 065007, China).

通过对该地区黏土矿物X衍射、岩心铸体的测试数据及电镜扫描微观图像分析，在层序格架下对渤中地区的成岩作用研究，发现三级层序界面的识别标志和有机碳以及黏土矿物有着明显的指示关系。一般最大湖泛面附近、基准面上升半旋回上部及下降半旋回的下部有机碳含量较高；随基准面的下降，有机碳含量逐渐降低，一般在层序界面附近达到最低值；高岭石在层序界面处的含量是最大的，伊利石在湖泛面处是最大的。

Based on the X-ray diffraction of clay minerals,analysis of resin-cast thin sections of cores and SEM observation of samples,the diagenesis study on the sequence stratigraphic framework of the paleogene strata in Bozhong Depression shows that there are
significantly relationships among the identification marks of three grade sequence interface and organic carbon and clay minerals.
The organic carbon content is higher in nearby the maximum flooding surface,the upper of rising half base-level cycle and the lower
of dropping half base-level cycle. The organic carbon gradually decreases with the decreasing of base-level and the minimum value
is nearby sequence boundary. The maximum value of kaolinite is on sequence boundary and the maximum of illite is on the
maximum flooding surface.