Application of Combined High Precision Velocity Modeling Technique in Buried Hill and Complex Structure Imaging in a Working Area at Bohai Sea
Velocity analysis is one of the most important steps in seismic data processing.Ac-curate velocity field provides the most basic guarantee for migration imaging.High-precision velocity model is the key to the imaging quality improvement in buried hill and complex structure areas.In the process of velocity modeling based on pre-stack depth migration meth-od,different requirements such as project operation cycle,modeling efficiency and modeling accuracy should be taken into account at the same time.Therefore,it is very important to a-dopt appropriate velocity modeling method for different tectonic zones.Taking a working ar-ea in Bohai Sea as an example,this paper firstly discusses the advantages and disadvantages of different velocity modeling methods,and then selects the velocity modeling method with complementary advantages according to the target layer in the working area.Grid tomo-graphy method is used for the target layer with shallow flat layer structure,nonlinear inver-sion method is used for the middle and deep buried hill and complex structural area,and ve-locity scanning stereoscopic tomography method is used for the interior of buried hill and basement structural area.The actual data processing results show that the combination of high precision velocity modeling method can obtain high precision velocity model,more rapid velocity inversion result in accordance with the logging data and seismic profile height,while greatly shorten project cycle and improve the precision of buried hill and complex structure area imaging,thus verifying the feasibility of combined high precision velocity modeling technology,practical and effective.
NETL
NSTL
万方数据
维普
