Application Of Tomographic Static Correction Technology In East Sichuan

With the continuous development of seismic exploration technology and the deepening of exploration,the seismic exploration in China has shifted from a rough and extensive exploration to a small range and high precision exploration.Especially for the potential oil and gas reservoir areas that have been preliminary exploration,it is an important direction for the exploration work to use the new method for more detailed two,three exploration or reprocessing and reanalysis of the new technology for the application of the old data.The oil and gas reservoirs in the eastern part of Sichuan are rich,but because of the complex terrain conditions,many regions have not been explored and developed in time,and there are a large number of multi-layer exploration potential.The surface conditions of East Sichuan are very complex,the stability of the refraction layer is poor and the velocity of the low speed zone has a large transverse change,which makes the static correction become the primary problem that restricts the oil and gas exploration in the east of Sichuan.The traditional static correction method has certain limiting conditions,such as the static correction in the field is too thick or the change of the underground structure will lead to the decrease of the accuracy;the static correction of the refraction wave is limited to the assumption of the layered medium,so it can not solve the static correction problem in the east of Sichuan.In view of the medical CT,tomographic inversion statics is a "layer by layer analysis" of the detected geological body,which can accurately reverse the underground velocity model without any hypothesis.In recent years,a more mature chromatography module has been introduced in various processing software,which makes the production and application of the tomographic static correction technology popularized.Therefore,the chromatographic static correction has also become a hot spot of application in the actual production.On the basis of the analysis and study of traditional static correction methods,this paper introduces the theory of chromatography static correction,and introduces some common technical methods of static correction.In the actual data processing,the GeoEast software developed by the Orient geophysical company has been used to deal with the old data of the East Sichuan area,and the results are compared with the field statics and refraction static correction.Through a series of comparisons,it is found that the quality of single shot gather is improved obviously and the quality of stacked section is improved.Practice has proved that tomographic static correction technology has significant advantages for statics correction in East Sichuan,and is worth promoting.