Application of OBN with Wide Azimuth Seismic Survey in Buried Hill Exploration
XUE Zhigang
ZHANG Zhenbo
LIU Zheng
QIU Nenggen
Abstract：The Ocean Bottom Node(OBN)is widely employed in offshore oil and gas exploration owing to its flexible construction,easy obstacle avoidance,and wide azimuth.OBN 3D seismic acquisition was carried out for the first time in the South China Sea for the fractured reservoir of HZ26-6 buried hill in Zhuyi Depression,the Pearl River Mouth Basin,and wide azimuth seismic data were obtained.Offset Vector Tile(OVT)gathers were extracted after signal preprocessing,noise attenuation,signal deconvolution,wave field separation,and multiple attenuation.Subsequently,the study conducted multi-azimuth grid tomographic velocity modeling and prestack depth migration to obtain abundant azimuthal anisotropy information.The comparison of new and old imaging data shows that OBN with wide azimuth acquisition can effectively avoid the influence of seabed obstacles.The processed seismic data exhibits a high signal-to-noise ratio and superior imaging of buried hilltop and interior faults.The amplitude anisotropy ellipse fitting has great potential for predicting buried hill fracture reservoirs.
Keywords：Ocean Bottom NodeWide azimuthBuried hillEllipse fittingFracture prediction
Publication Date：2024-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 102-109 )