A 3D Ultra High Resolution Seismic (UHRS) survey was initiated in the summer of 2023, offshore USA. The survey, utilizing a P-Cable system, covers an expansive area very efficiently. The near-surface stratigraphy, ranging from the Miocene to the Holocene, provides a geological context challenging for effective site characterization.
The processing workflows for 3D UHRS data, although sharing similarities with conventional seismic processing sequences, require enhancement due to significant scale differences. High-Performance Computing (HPC) resources are vital for processing the high-density and small-samplingrate 3D UHRS data. Key steps include achieving a broadband wavelet via data-driven deghosting and designature techniques. Accurate statics computation addresses challenges arising from sea state variations, ensuring clear and sharp reflections. The demultiple step, utilizing methods like convolutional 3D Surface Related Multiple Elimination (SRME) and 3D wave-equation multiple modeling, effectively removes unwanted reverberations, providing a cleaner seismic dataset.
While the acquisition and processing are ongoing, preliminary post-stack time migration results provide a continuous 3D volume with high vertical and spatial resolution. The 3D aspect provides an invaluable platform for interpretation, small features detection, shallow geohazard investigation, and quantitative analysis.
