Application of Offshore 3D"Plug-Line"High-Density Seismic Acquisition and Processing Technology in the Exploration of M Area in South China Sea
DU Junfeng
SHI Wenying
HU Bing
CHEN Huiwen
YU Hong
Abstract：In order to solve the problem of complex structure imaging in seismic exploration,the proposed marine secondary three-dimensional(3D)acquisition based on target exploration in recent years mainly focuses on wide azimuth and high coverage,but the difficulty of construction and acquisition costs have doubled.According to the current demand for cost reduction and quality and efficiency improvement,the seismic profiles of forward modelling from five different streamer acquisition and observation systems were compared by experiments,and it was concluded that the effect of seismic profiles by"plug-line"acquisition fusion was equivalent to that by high-density acquisition.Based on the results of forward modeling,a new and old 3D"plug-line"high-density streamer acquisition and observation system was designed for the first time in China.At the same time,technical research was conducted on the fusion processing of new and old 3D seismic data,forming a set of new and old 3D"plug-line"high-density acquisition and data processing technologies.Compared with the conventional acquisition and observation system,new and old 3D"plug-line"acquisition increased the gun channel density per unit area,reduced the seismic acquisition bin,and significantly enhanced coverage times,and it could obtain high-quality high-density seismic data results.The application in the paleogene complex structural zone in the M area of the South China Sea shows that the new and old 3D"plug-line"acquisition can effectively improve the imaging quality of seismic data and effectively support the exploration target evaluation.It is of great reference significance for secondary 3D exploration and deployment in other sea areas.
Keywords：Secondary 3D acquisitionHigh densityForward modelingBroadband processingFusion pro-cessingPaleogene system
Publication Date：2025-06-30
Online Publishing Date：2025-08-25(First online date of this platform, not the publication date of the document)
Pages：14( 168-181 )