Sedimentary facies and evolution of the Member 2 of Paleogene Shahejie Formation of BZ25-1 Oilfield in Bozhong Depression, Bohai Bay Basin
Meng Hao1, 2, Zhong Dakang1, 2, Li Chao3, Zhou Junliang3, Qin Gang1, 2, Liu Yunlong1, 2, Liu Keru1
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 2 State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum (Beijing), Beijing 102249; 3 Research Institute of Exploration and Development,Tianjin Branch,CNOOC,Tianjin 300452;
Abstract：BZ25-1 Oilfield is located in the south of Bozhong Depression, Bohai Bay Basin and the main pay zone is the Member 2 of Paleogene Shahejie Formation. Based on core observation,as well as data of well log and seismic,it is suggested that two facies,braided river delta facies and lake facies,were developed in the Member 2 of Shahejie Formation. Due to long distance from the provenance,subfacies of braided river delta front and shallow lake were mainly developed in the study area. During the depositional period of the Member 2 of Shahejie Formation,the palaeogeomorphy in the study area shows that it was higher in the north and lower in the south. During the early stage of the depositional period of the Member 2 of Shahejie Formation,the lake was shallow and there were mainly beach-bar sand bodies overlapping from lowland in the southwest to the uplifted area in the northeast. Along with tectonic subsidence and lake water deepening ,the braided river delta front sand bodies prograded from the southwest to the northeast,and finally became dominant in the study area,whereas beach-bar sandbodies faded out gradually. During the late stage,the BZ25-1-1 wellblock located in the west part of the research area uplifted,which resulted in the total lack of the Member 2 of Shahejie Formation in this wellblock,as well as partial erosion in adjacent areas.
Meng Hao,Zhong Dakang,Li Chao et al. Sedimentary facies and evolution of the Member 2 of Paleogene Shahejie Formation of BZ25-1 Oilfield in Bozhong Depression, Bohai Bay Basin[J]. JOPC, 2016, 18(2): 161-172.
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