Key technologies for improving the imaging of Paleogene interior structure:A case study on the gentle slope zone in Panyu 4 sag,the Pearl River Mouth Basin
Several key technologies have been adopted to overcome the challenges such as weak signals,multiple wave interference,and low signal-to-noise ratio in the seismic data of the Paleogene strata on the western gentle slope of Panyu 4 sag of the Pearl Riv-er Mouth Basin.These technologies include 3D r-p transform ghost wave suppression,shallow-water multiple wave suppression,and high-precision velocity modeling.These technologies can enhance the signal-to-noise ratio of seismic data to improve interpreta-tion accuracy,and achieve breakthroughs particularly in the delineation of intra-sag strata contacts and basement imaging.It is found that effective reflections are typically concentrated in 6～36 Hz,but the absence of low-and high-frequency signals limits the detailed delineation of strata contacts.Hence,the use of the aforementioned technologies has been proposed to improve the quality of seismic data.The ghost wave suppression technology successfully separates and suppresses ghost wave noise,while shallow-wa-ter multiple wave suppression technology specifically predicts and attenuates multiples.The integrated application of these tech-niques has resulted in significant improvements in the imaging of the Paleogene interior structure,clearer wave group characteris-tics,more reasonable strata contact relationships,and notably enhanced imaging quality of complex faults in the medium-deep stra-ta.The conclusion emphasizes that the application of ghost wave suppression and shallow-water multiple wave suppression technol-ogies has significantly improved the quality of medium-deep seismic data,which is of great importance for oil and gas exploration in the Pearl River Mouth Basin,especially in Panyu 4 sag and its adjacent areas.It provides a new technical approach for improving the quality of seismic imaging in similar depositional environments.
3D τ-p transform for ghost wave suppressionshallow-water multiple wave suppressionPearl River Mouth BasinPan-yu 4 sagPaleogene imaging
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