The Study On Seismic Data Processing Technologies In The Near-surface Igneous Rock Development Area

The XW exploration area is one of the most important areas in Jiangsu oil field.After many years of research,especially the exploration breakthrough in 2014 in the Mai Chen depression,it's showing that the XW exploration area has good exploration prospects.But it has a very complex structure in the near-surface which is magmatic geologic condition characterized by the development of igneous rocks,the alteration of the surface rocks,and the presence of basalts.Because of the poor seismic data quality in the complex near-surface condition,the imaging effect of key parts of subsurface structures becomes one of the most important factors that restricts the breakthrough of the XW exploration area.It's characterized by extensive development of igneous rocks in the near surface of XW exploration area.The development of igneous rocks in the western part is relatively shallow,and which is relatively deep in the eastern part.In the eastern part,it appears large sets of high speed layers reversed.Because of quickly structures changed in the near-surface,static correction problem is serious.In addition,the dim first arrival stimulated on the basalt has a bad effort to static correction problem solving.What's more,the linear noise is very serious in the igneous rock development area,resulting in the low signal to noise ratio of seismic data.In conclusion,the application of inverse time migration technology to solve the complex problems faces two difficult problems: First,the data signal to noise ratio is low;Second,the depth of velocity modeling is very complex.With the high-precision 3D seismic data of XW area,we have established a seris of seismic data processing technologies in the near-surface igneous rock development area,including the near-surface igneous zone static correction technology,the high-speed linear interference suppression technology,and the prestack depth imaging technology applied to the complex construction area.After applied to the XW high-precision three-dimensional seismic data processing,it proves that these technologies can solve the practical problems well and achieve better results.In summary,this paper summarizes the key technologies of seismic data processing in near-surface igneous rock development area,which is helpful to guide the study on seismic data processing in similar areas.