Studying Of Shallow Reflection Seismic Data Processing Method About Wenchuan Earthquake’s Main Fault

After the 2008 Wenchuan earthquake, a high-resolution seismic reflection profiles were laid across the main fault near the scientific mainland drilling WFSD-1, exploration of space distribution of fault, fault form and characteristics of the subsurface structure,obtained the seismic profiles through the central Longmen mountain fault. Because of the complex geological factors and extreme surface conditions, so collected information on seismic data single shot, shallow data serious of near-surface anomalies, signal to noise ratio is low, the conventional treatment resulting superposition profile events in the shallow parts of blur. This article describes the problems of the original seismic data processing, research data, to improve the signal to noise ratio of shallow information.Major completed work and research results are as follows:1. Use datum correction and relative delay time refraction static correction to solve the surface structure of complex survey line, the relative differences were large, low-velocity layer velocity and thickness of the shallow data caused by rapid change, the outstanding issue of the near surface anomalies. Better c corrected shallow near surface exception.2. Use the surface consistency deconvolution methods to resolve the study area underground structure complex and varied causes multiple development, low signal to noise ratio. Improved the shallow reflection of SNR and horizon.3. Use DMO method resolution subsurface occurrence and varied causes General CMP overlays section shallow events printout . Improved the profile of the reaction mass transit capacity of shallow features.This article uses the above special handling methods, by designing a reasonable process and parameter data of the study area, the seismic data from shallow data processing produces good results, It also made a meaningful exploration on complex area of shallow seismic data processing。...