Abstract:

 During the period of Zhuhai Formation deposition in Huizhou depression， marine transgression from the southwest seaway entered the depression. The sediments supplied by Paleo-Pearl River Delta from the northwest in this area were transformed by tidal current and then offshore tidal deposits were formed. Tidal flat sedimentation was dominated in  Block A of the study area. Using high-resolution sequence stratigraphy principle，medium-scale stratigraphic cycles which response to base-level cycles are recognized in Zhuhai Formation by the analysis of sedimentological and stratigraphic responses to A/S value changes based on cores and well logs. With the guidance of tidal deposition model， tidal reservoir sandstones are predicted in chronostratigraphic framework by using seismo-sedimentological analysis methods and stratigraphic slice technology，optimization of seismic attributes based on 3-D seismic data in the study area， which provides more evidences for oil and gas exploration and development in this Block.

Key words: tidal sedimentary, sequence characteristic, stratigraphic slice, attribute extraction, Zhuhai Formation, Huizhou depression