Optimizing Zipper Division and Splicing Methods for Efficient Large-Scale OBN Seismic Acquisition

Offshore large-scale Ocean Bottom Node (OBN) seismic acquisition projects often face constraints such as limited node capacity, complex survey area conditions, and varying operational modes. These challenges necessitate the adoption of zipper division and splicing designs to ensure efficient data acquisition. This paper systematically summarizes methods for zipper division and optimization. When survey areas have complex geometries, selecting a zipper division sequence that minimizes repeated shots is advisable. In cases where challenging environments, such as shallow waters or islands, are present, division strategies should aim to reduce the occurrence of repeated shot points in these areas. Furthermore, irregular zipper division methods can be employed to decrease the required number of nodes. Meanwhile, this paper proposes three optimized splicing design methods tailored to offshore OBN seismic projects. These include: A quantitative analysis method for stitching irregularly divided zippers, aimed at reducing node input. A stitching design method with a crossline orientation, which facilitates reasonable planning of project operation duration. A splicing method optimized for efficient operations in TZ surveys. Examples provided in the paper demonstrate the practicality and efficiency of these zipper and splicing design methods, highlighting their potential to enhance operational outcomes in complex marine environments.