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The Researches on Improving the Precision of the Multi-component Seismic Velocity Analysis

Author: WangLiMing
Tutor: LiQingChun
School: Chang'an University
Course: Earth Exploration and Information Technology
Keywords: Converted wave of transition points Time-distance relationship Velocity spectrum Resolution Selective velocity analysis
CLC: P631.4
Type: Master's thesis
Year: 2005
Downloads: 153
Quote: 3
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Abstract


Multi-wave velocity analysis is an important part of the multi - wave and multi - component seismic data processing , how to improve the vertical accuracy of the shear wave velocity parameters became the core of the problem . Converted wave on the downstream wave asymmetry , making routine based on common midpoint (CMP) gathers speed of analysis can not be applied to the converted wave . The inherent characteristics of the major difficulties common conversion point (CCP) gathers sorting and converted wave from the converted wave time-distance relationship : first , even a homogeneous medium level reflective layer , the horizontal position with the converted wave conversion point geophone distance, the reflective layer depth and aspect velocity ratio varies . Second , converted waves when distance relationship is not hyperbolic, hyperbolic time away from the relationship between the velocity analysis , will not get the correct converted shear wave velocity values ??, especially in the case - shallow and large offsets will be large errors . Further, according to the traditional realization of ideas , all the gathers speed , so that , in the adjacent primary wave phase axis , or the inclination of the reflective layer , or in the case of multiple wave exists identify primary wave , it will resolution of the velocity spectrum is greatly reduced. The papers on the basis of previous work , analysis, research on these issues and summarize the main completed the following work . First , through the propagation characteristics of the converted wave conversion point , influence factors and formula analysis summarizes CCP gathers selected row algorithm . Second , when converted wave travel time from the relationship were analyzed and summarized, and combined the converted wave conversion point formula to achieve the traditional multi-wave velocity analysis algorithms . Third , in the analysis of the algorithm based on traditional multi- wave velocity , achieve an effective increase speed spectral resolution velocity analysis method , which we call a multi - wave selective method of velocity analysis . Finally, from the theoretical model to the actual data for the three different algorithms were tested with the effect of contrast . The results show that the wave of selective correlation analysis method is a high-precision , high - resolution velocity analysis method .

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
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