Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2021, Vol. 43 ›› Issue (1): 30-40.DOI: 10.11885/j.issn.1674-5086.2019.05.06.03

• GEOLOGY EXPLORATION • Previous Articles     Next Articles

Anastomosed Shallow-water Delta of the Lower Member of Minghuazhen Formation in Huanghekou Sag

LIU Wenchao, SHEN Xiaoxiu, WANG Shaopeng, LAI Youchun, MIAO Feifei   

  1. Bohai Oilfield Research Institute, Tianjin Branch, CNOOC China Limited, Tanggu, Tianjin 300459, China
  • Received:2019-05-06 Online:2021-02-10 Published:2021-01-23

Abstract: In order to understand the sedimentary model of anastomosed shallow-water delta during the shrinking period of a lake basin, the study analysed the lower Member of Minghuazhen Formation of the Huanghekou Sag integrating well logging, mud logging, core, grain size analysis and seismic data. The results indicate that the sand body of the anastomosed shallow-water delta in the lower Member of Minghuazhen Formation of the Huanghekou Sag is mainly a product of vertical accretion. The river channel is net-like and interlaced, with a small width-to-depth ratio and a strong stability, and sand bodies are moderately developed. It's formed in the low slope where network channels develop both in the delta plain and the delta front facies. The channels are flower-like, and the sedimentary microfacies. The natural levees, floodplains and sheet sands account for most sediments. The formation process is the model of "channels flower-like" dominated by overbank sediments. From the formation mechanism, natural levees are developed on both sides of the anastomosed shallow-water delta, which increase lateral stability, and the diversion is the main mechanism for the forming of new channels.

Key words: Huanghekou Sag, the Lower Member of Minghuazhen Formation, low stand systems tract, anastomosed shallowwater delta, “channels flower-like” model

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