Application Of Seismic Modeling And Statics Correction With Complex Topography

In recent years the focus of our Seismic exploration is mainly distributed in the desert areas of Xinjiang,loess tableland of Shanxi and Inner Mongolia the south mountain of ChuanDongNan.A common characteristic of the information in these places is due to serious static correction problems caused by the complicated geological conditions.Seismic wave field form cannot accurately reflect the real underground media form,causes to explain regional structure errors,coupled with high exploration input costs restricted the oil geophysical exploration and development of this area.Therefore,explore and study the complex surface static correction under the condition of data processing method has important theory meaning and realistic meaning.To study the static correction problem is usually very difficult through the actual seismic data,because the acquisition of seismic data tend to be high precision,high fold numbers causers the data has large quantity,data signal-to-noise ratio is usually very low,basis on these data to change information and test effect of static correction calculation is not realistic,Combining with the actual data itself has a lot of uncertainty,let the test results also lack of convincing.Therefore,through the forward modeling seismic data of complex surface conditions,and proceed all kinds of analysis tests is convenient and feasible and operable.Firstly choose a practical processing and interpretation of the typical southern mountain seismic section,data has big ups and downs elevation difference,uneven weathering thickness,and Surface transverse lithologic changes big caused of complete the syncline structure,and fast change wait,contains prominent problem of static correction.Then through the forward modeling software,using of 3D heterogeneous medium acoustic wave equation forward modeling method and combining with logging data,and other areas of physical parameters,selecting rational observation system and forward modeling parameters to simulate the earthquake records.According to the simulation records make simulation record can reflect the characteristics of real seismic data.Through a detailed comparative analysis,and ultimately determine the two sets of geological model to provide basic data for research.Then using the model to calculate the forward modeling of seismic data,analysis of different first arrival time information and make use of different early to pick up way to construct the surface model,to study whether the performance of surface layer model are consistent with the actual model.And continue to explore different offset of arrival time pick up and arrival time pick up accuracy influence on static correction calculation accuracy,Analysis of different static correction algorithm for different adaptation degree of complex geological body.Through the analyses of the simulation results to guide the actual data after static correction processing method makes sense.