Sequence Stratigraphic Framework Research In SB21-23.8in Baiyun Sag In The Northern Part Of The South China Sea

This paper relies on sub-research of Important National Science&Technology Specific Projects "reaseach the internal structure of the northern South China Sea deepwater sedimentary favorable reservoir zone", whose study area is the northern part of the South China Sea deepwater area, about4,000square kilometers of three-dimensional coverage. Through seismic and drilling data, it identify SB21and SB23.8sequence delta, deepwater fan deposits and analyze their internal structure. Combined with the seismic response of sedimentary rock composed of the upper and lower body impedance structure modeling and inversion analysis, it describe depositional systems and analysis sedimentary facies of delta lobes-deepwater fan depositional relationships. The main work is as follows,1) SB21, SB23.8sequence stratigraphic frame structures researchBased on classic sequence stratigraphy and deep-water sediments theory, and combined with the area structure, development and evolution of sedimentary features, and seismic sequence boundary identification, drilling sequence boundary identification, it build each third-order sequence stratigraphic framework, sequence comparison of the region’s fine be explained. Through the sequence stratigraphic wells and horizontal comparative analysis of the evolution, development and evolution of seismic stratigraphic analysis, sequence stratigraphy sort out the various elements (sequence boundaries, systems tracts, low deposition body) development of distribution features; on the basis of the above research, analysis deepwater sedimentary relationships deposition system near sequence boundary analysis, delta lobes-study deepwater fan relations and developmental context. 2) Velocity AnalysisAnalysis of different lithology, physical properties, including the impact of oil and gas reservoir speed, wave impedance, etc., for the study of reservoir depth sections cover different combinations to provide data to support the seismic response.3) Waveform analysis and forward-based sand recognitionPetrophysical analysis results of the analysis is based on speed, for a variety of reservoir-cap portfolio forward, calibration of seismic geological conditions in the study area under special sand response characteristics.The work above may lay the foundation for forecasting favorable reservoirs within the study area.