Evolution regularity of the Neogene shallow water delta in the Laibei area Bohai Bay Basin, northern China

Journal of Palaeogeography

Cheng-Min Niu¹  Jian-Ping Li¹  Rui-Bo Guo²  Hao Liu³ 

[1] Exploration & Exploitation Research Institute, Tianjin Branch of China National Offshore Oil Corporation, Tianjin 300452 China;Petroleum Engineering College, China University of Petroleum (East China) Qingdao 266580, China;School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083 China;

关键词: shallow water delta;    evolution;    Lower Member of the Minghuazhen Formation;    Neogene;    Laibei area;    Huanghekou Sag;    Bohai Bay Basin;   

DOI  :  10.3724/SP.J.1261.2014.00055

来源: DOAJ

【 摘 要 】

According to the characteristics of sedimentary microfacies, unique vertical depositional sequences and well logging response, the authors propose that a shallow water delta was widely developed in the Neogene of the Laibei area, Bohai Bay Basin of northern China. Based on seismic minimum amplitude slices, well logging data, test analytical data and so forth, detailed research on the evolution of the shallow water delta of the Neogene Lower Member of Minghuazhen Formation was conducted. The results indicate that the third-order sequence base level controls sandbody types. During a period of low base level, a distributary channel sandbody of shallow water deltaic plain was developed. With base level rising, the sandbody type gradually changed into a subaqueous distributary channel sandbody and a sheet sand can be found as well. The fourth-order sequence base level controls medium–short term evolution of the sandbody. Within a sequence, due to the rising and falling of base level, the sandbody assemblages are identified as an upward-coarsening type, an upward-fining and a compound type respectively. Regionally, from the Laibei Low Uplift to the Huanghekou Sag, the shallow water delta evoluted from a dendritic shape, to a cuspate shape and finally to a sheet shape.

【 授权许可】

Unknown