Sedimentary facies of the Upper Cretaceous Taizhou Formation in Dongbu Sag of Subei Basin
Lu Ying1,2, Sun Ziming3
1 Institute of Geological Sciences, Jiangsu Oilfield Branch Company，SINOPEC，Yangzhou 225009，Jiangsu 2 China University of Geosciences（Beijing），Beijing 100083 3 Exploration and Production Research Institute，SINOPEC，Beijing 100083
Abstract：The Subei Basin is a half-graben which was developed in Late Cretaceous. The Upper Cretaceous Taizhou Formation(K2t)is dominated by a set of clastic rocks which were deposited in the early stage of the sag evolution and constituted an upward fining sedimentary cycle. Based on the comprehensive analyses of the logging and core data of 52 wells，three facies types including braided fluvial delta，meandering fluvial delta and lacustrine facies were identified in the Taizhou Formation，which can be sub-divided into 7 types of sedimentary subfacies and 12 types of sedimentary microfacies. During the early-middle depositional period of the Member 1 of Taizhou Formation，braided fluvial delta was mainly developed.During the late period，the depositional environment was dominated by the（meandering fluvial）delta. During the early depositional period of the Member 2 of Taizhou Formation，semi-deep-deep lacustrine facies was developed and shallow lacustrine was developed during the middle-late period.With the lake level rising and falling，it was characterized by an obvious multi-cycle.The Member 1 of Taizhou Formation was characterized by an obvious retrograding delta.On the basis of the analyses of the planar distribution and evolution of sedimentary facies of the Member 1 of Taizhou Formation，it is concluded that sandbodies are developed along the Liangduo-Anfeng-Libu area，which is the favorable area for the development of petroleum reservoir.
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