The Comparative Study Of Static Correction Methods In Western Region

Static correction technology of the complex surface is notonly one of the difficulties of seismic survey in land but alsothe criticality in restricting the oil-gas survey in the west.The complicated surface conditions and the violent changes ofthe lithologic characters make it impossible that the study ofthe static correction method in this area can highly improvethe accuracy of seismic survey and the success rate of drillingwhich play an important significance in decreasing survey riskand cost saving.In this paper we discuss various methods of how to deal withthe static correction. On the basic of introduction the surfacestructure of western areas we propose the survey methodsadapted all kinds of surface structures. Chaidamu Basin can bedivided into four typical target areas according to its landfeature. In these target areas we elect two or threerepresentative chains to establish the proper structure andspeed model of the geology surface, study the different surfaceand it's surroundings' conditions as well as the method of staticcorrection in the purpose of getting the effective staticcorrection method and technology suited for the special seismicconditions of the Chadamu Basin.The innovations in the thesis are as follows:1,We finished the demarcations of the near surface and the geotextures in Westregions, the distinguishing features of the various static correction methods and theirsphere of application. By more, we need apply the homologous method according tothe different surface and geotextures.2,We research and develop a kind of software of the static correction methodwith the high accuracy in deflection, which get high evaluation in the practicalapplication.3,We did a comprehensive research of the surface level structure in severalcanonic zone in the Chaidamu Basin. Meanwhile, we built the surface level structuremodel, made several tests with different methods in static correction, sum thecongeniality of the static correction according to the different areas.With the research, we can get the better results in theaspects of acquirement and processing, which makes us get thehigher seismic profiles to interpret the seismic data. By more,the technique gives a way to promote the seismic explorationand make a new survey-breakthrough in the Western region.