永宁南部延长组长73沉积相特征

Sedimentary facies characteristics of Chang 73 of Yanchang Formation in southern Yongning

综合利用测井和沉积构造的特点对永宁南部延长组长73进行沉积微相研究,认为永宁南部延长组长73期的沉积相为浅-半深湖沉积。进一步可以划分为浊积岩、浅-半深湖泥岩、浅-半深湖页岩等3种微相类型。对研究区沉积相进行研究,可以为该区烃源岩评价奠定了基础。

The sedimentary microfacies of Chang 73 of Yanchang Formation in southern Yongning is studied by using the characteristics of logging and sedimentary structure.It is considered that the sedimentary facies of Chang 73 of Yanchang Formation in southern Yongning is shallow-semi-deep Lake deposit.It can be further divided into three microfacies types:turbidite,shallowsemi-deep Lake mudstone and shallow-semi-deep Lake shale.The study on the plane distribution of sedimentary facies lays a foundation for the evaluation of source rocks in this area.