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Investigation On Seismic Data Pre-stack Reverse Time Migration Approach Of Complex Structure

Posted on:2016-08-04Degree:MasterType:Thesis
Country:ChinaCandidate:X KeFull Text:PDF
GTID:2180330461981423Subject:Geological engineering
Abstract/Summary:PDF Full Text Request
Migration of seismic data is an important mean of seismic exploration to obtain information through the underground structure, it is the most accurate imaging method which based on the two-way wave equation. It can break through the limit of the structure dip and migration aperture, image with diffracted wave, rotation wave and even multiple wave. But the approach itself has a high computational cost, low frequency noise, large memory requirement, the boundary conditions of wave field simulation and the seismic wave dispersion suppression also need to be deeply researched.To solve the above problems, this paper carried out the wave field simulation with optimized differential coefficients, seismic wave dispersion analysis, GPU(Graphics Processing Unit) acceleration, random boundary condition, PML boundary storage strategy, low frequency noise suppression with Laplacian operator, data tests and Qt integration and other aspects of the reverse time migration. This paper mainly made the following progress:(1) This paper began with the seismic wave field numerical simulation of finite difference numerical simulation with optimized differential coefficients, then studied the main factors affecting the numerical dispersion, analyzed the stability of seismic wave field numerical calculation;(2) This paper studied CPU and GPU parallel collaborative acceleration technology, the computational efficiency of seismic wave field numerical simulation and reverse time migration accelerated algorithm are greatly improved;(3) Researched and analyzed the random boundary condition and PML boundary with efficient boundary storage strategies, greatly reduced the storage volume of wave field, gave the applicable conditions and scopes of random boundary and efficient boundary storage approach.(4) Studied the low frequency noise suppression with Laplacian operator, effectively suppressed the low frequency noise of reverse time migration;(5) This paper made large amount of data tests and analysis, respectively, tested the Marmousi model, Sigsbee 2A model, 2D salt model, BP2004 model, letters model, deep fault model, broken basin model, carbonate reservoir model and actual data by reverse time migration;(6) Studied QT interface integration technology, packaged and optimized the seismic wave field numerical simulation and pre-stack reverse time migration algorithm, formed a fast, strongly practicable and friendly interface.
Keywords/Search Tags:reverse time migration, wave field simulation, GPU, random boundary condition, PML boundary condition, carbonate reservoir
PDF Full Text Request
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