Fig. 1From: Development characteristics and controlling factor analysis of the Neogene Minghuazhen Formation shallow water delta in Huanghekou area, Bohai offshore basina Location of the Bohai Bay Basin marked in red color (Inset map of China is modified after State Bureau of Surveying and Mapping, GS(2016)1591), b Map showing structural units of the bottom surface of the Paleogene in entire Bohai Bay Basin, c Thickness map (time domain) of the Neogene of the HHKA, a macro-reflection of topography of the Neogene depressional lacustrine basin in the HHKABack to article page