Sedimentary Microfacies of Guantao Formation in Kenxi Area,Zhanhua Depression

Detailed description of reservoir generally needs the study of sedimentary microfacies of small layers, and clarifying the sedimentary microfacies characteristics of the small layer is essential for founding the sedimentary frame.Based on core observation and well log analysis,guided by the theory of traditional sedimentology and high-resolution sequence stratigraphy,following the basic principle of sedimentary microfacies analysis from type well logging to multiwells correlation in the whole area and employing sedimentary microfacies analysis method used in reservoir description,the authors made a detailed study of the types and characteristics of sedimentary microfacies in Guantao Formation reservoir of fault block K71.The results show that this zone can be divided into seven sedimentary microfacies,i.e.,retention sediment,sand bar sediment,bend sand bar sediment, spontaneous bank sediment,burst fan sediment,sloping over sediment,and floodplain lake sediment.The reservoir is mainly of channel sediment,channel margin sediment and floodplain sediment,and the distribution of the reservoir in this zone is scattered.The identification of these characteristics is significant for reservoir quality prediction.