Characteristics and sedimentary evolution of the Member 1 of Paleogene Kongdian Formation of Weibei Sag in Shandong Province
Chen Shiyue1 Wang Ling1 Zhou Qingbo1 Bai Jingbo2 Li Wentao3 Sun Tingbin1 Han Min3
1 School of Geosciences，China University of Petroleum，Qingdao 266580，Shandong 2 Research Institute of Petroleum Exploration & Development，PetroChina，Beijing 100083 3 Research Institute of Geological Sciences of Shengli Oilfield，SINOPEC，Dongying 257061，Shandong
Abstract：Based on the comprehensive analysis of cores， drilling well，logging and seismic data，the stratigraphic characteristics and sedimentary evolution in the Member 1 of Paleogene Kongdian Formation in Weibei Sag was analyzed.This study suggests that the Member 1 of Kongdian Formation was divided into 3 sub-members，containing 11 sand sets.Controlled by Tangwu-Gegou fault in the west and Changyi-Dadian fault in the east，the strata developed stably in the east and west，only in the northern sub-sag belt strata became thicker.Controlled by Gucheng-Weihekou fault in the northern Weibei Sag，the strata overlapped towards the south and thinned generally from north to south.Fan delta facies and lacustrine facies mainly developed in Member 1 of Kongdian Formation in Weibei Sag，and delta developed in small scale in the southern slope belt.During the development of the lower submember of Member 1 of Kongdian Formation，sediment supply was abundant，which formed the large-scale fan-deltas in northern sub-sag belt，Wacheng fault-step belt and Zaohu fault-nose belt.During the development of the middle submember of Member 1 of Kongdian Formation，the depth of water became shallower and sediment supply decreased，fan-deltas inherited the development in northern sub-sag belt，Wacheng fault-step belt and Zaohu fault-nose belt，which distributed in small scale.During the development of the upper submember of Member 1 of Kongdian Formation，the depth of water became the shallowest，the whole area developed shore-shallow lacustrine facies，and only small-scale fan-deltas developed in Wells Yangxie 4 and Chang 11.
Chen Shiyue,Wang Ling,Zhou Qingbo et al. Characteristics and sedimentary evolution of the Member 1 of Paleogene Kongdian Formation of Weibei Sag in Shandong Province[J]. JOPC, 2012, 14(5): 553-564.
