Study And Application Of Seismic Data Acquisition Method In Bohai Bay Basin

With the deepening of seismic exploration and development in Bohai Bay basin,the middle and deep reservoir targets such as clastic rocks,deep buried hills and the interior of buried hills have become the main potential of oil and gas resource exploration.The quality of seismic data in Bohai Bay basin is seriously restricted by the complex underground targets and the superimposed sea-land transition zone and other surface conditions.Seismic acquisition technology has become the key to oil and gas resource exploration in Bohai Bay Basin.Starting with the surface conditions,such as land,transition zone as well as sea environment,and medium and deep reservoir targets of seismic acquisition in Bohai Bay basin,this paper,on the basis of technical investigation,carries out an all-round research from geometry optimization to operation design and implementation.Firstly,based on the seismic geological conditions of Bohai Bay Basin,two-and three-dimensional models are established,and the parameters of the geometry are analyzed and optimized by 2D and 3D forward modeling results of illumination analysis and attribute analysis for the target layers.The geometry design method based on geological target is constructed,which improves the data quality of reservoir targets.Furthermore,taking into consideration of the complex surface conditions of Bohai Bay Basin,seismic acquisition methods are studied.The operation scheme is designed with the integration of sea and land surface conditions.The excitation parameter verification and optimization design of air gun array are also introduced.According to the analysis of receiving condition and equipment capacity,dual-sensor technology is adopted to form the optimized receiving scheme of seismic data acquisition.Finally,the paper discusses the difficulties and countermeasures in the implementation of the operation scheme in Bohai Bay basin,and presents the practical application results.After systematic research and practice introduction of seismic acquisition technique in Bohai bay basin,three-dimensional seismic acquisition technology suite for TZ and shallow water areas has been set up,in which integrated concept of geological target-oriented and seismic geological conditions-based geometry design is included,as well as seamless seismic acquisition operation with the presence of many different obstacles.The suite lays the foundation for a new round of seismic exploration in Bohai Bay basin,and is a good reference for the acquisition design and implementation of other work areas.