Sedimentary model and controlling factors of modern beach-bar sediments in east coast of Xiashan Lake in Shandong Province
Bai Li-Ke1, Qiu Long-Wei1,2,3, Yang Yong-Qiang1,2,3, Du Shuang-Hu1, Yang Bao-Liang1, Han Xiao-Tong1
1 School of Geosciences,China University of Petroleum(East China),Shandong Qingdao 266580,China; 2 Key Laboratory of Deep Oil and Gas,Shandong Qingdao 266580,China; 3 Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Shandong Qingdao 266237,China
Abstract：Beach-bars, one of the important hydrocarbon reservoirs formed in the coastal zone,become the exploration target in terms of subtle reservoirs. In order to figure out the sedimentary model of beach bars deposited in the east coast of Xiashan Lake,a detailed study on sedimentary characteristics and controlling factors of beach-bars was carried out by using ground penetrating radar (GPR) and grain size analysis. The results show that,the east coast of Xiashan Lake has developed two types of sedimentary systems including beach bars and eolian dunes. The eolian sediments in the early stage are well-sorted fine-grained sandstones, which are characterized by large tabular cross-bedding and two-segment pattern on grain size cumulative frequency plot. The beach bars sediments are reverse graded medium-grained sandstone and feature the low-continuity tabular cross-bedding. Plant roots,scouring structure,interbedding of sand and mud and three-segment pattern on on grain size cumulative frequency plot arethe typical characteristics of beach￣bar deposits. The saltation proportion is divided into two different parts indicating high energy hydrodynamic condition. Layered reflecting structures can be confirmed through GPR which implies the eolian sediments depositional pattern. The analyses of environmentally sensitive components of the grain size of eolian sediments suggest two different hydrodynamic environment. In conclusion,eolian sediments and the change of paleogeomorphy environment depend on wind action. The coastal erosion plays an important role in the early stage of the position and sand supply for beach bars. According to the sedimentary model as well as its formation mechanism,we propose a ‘wind transporting-wave modifying’ sedimentary system,which will be helpful for identification of beach bars and the prediction of favorable reservoir.
Bai Li-Ke,Qiu Long-Wei,Yang Yong-Qiang et al. Sedimentary model and controlling factors of modern beach-bar sediments in east coast of Xiashan Lake in Shandong Province[J]. JOPC, 2020, 22(2): 278-294.
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