Stratigraphic relationship and age of Haiyue buried hill belt in the beach area of Liaohe rifting basin

Abstract：This paper has studied lithologic combination, sequence structure and fossil specimens of carbonate and clastic buried hill strata of Haiyue buried hill belt. Based on regional stratigraphic correlation and analysis of frequency spectra, the authors determined ages of buried hills and relative locations of several drilling wells of the buried hill. The main kinds of carbonate rocks of the buried hill strata are composed of multiple types of dolomite, megascopic algae are developed extensively, diagenetic metamorphism of metamorphic quartz sand is intense, and volcanic rock occurs as thin-bedded strata. It is for the first time that the characteristics reveal that carbonate and clastic buried hill strata of Haiyue buried hill belt belong to Mesoprotozoic Dahongyu =-Gaoyuzhuang Formation. This discovery has changed the traditional understanding of the past many years that the buried hill in This area totally belongs to Ordovician and Carboniferous, provided valuable evidence for reestablishing stratigraphic sequence of the buried hill in This area, and demonstrated that the buried hill is a favorable place for oil-prospecting.