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Analysis of Error on Geological Interpretation Based on Wave Equation Numerical Simulation

Author: WuJuan
Tutor: GuoFaMing
School: Chengdu University of Technology
Course: Applied Mathematics
Keywords: Wave equation modeling Geological interpretation Error Prestack depth migration Multiplicity of Solutions
CLC: P631.4
Type: Master's thesis
Year: 2011
Downloads: 40
Quote: 1
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Abstract


As seismic acquisition technology continues to evolve, the richer information contained on the seismic section, where a lot of information on the use of physiognomy observed on the seismic section can not be detected. For some of the complex structure of the details of the border, the top and bottom position (such as the reef, buried hill, pinch out the special geological phenomenon), you still need to fine explanation. Latest fine structural interpretation based on seismic data using three-dimensional visualization, coherent seismic attribute analysis calculated using only the superimposed offset seismic profiles, strong subjective factors or multiple solutions. This article by two-way acoustic wave equation seismic numerical simulate synthetic prestack seismic records, time migration and depth migration of prestack seismic record, the corresponding structural section, used to verify the interpretation of the outcome, and the forward modeling and inversion to verify the interpretation of the outcome of combining multiple solutions and ideas as well as the geological interpretation process based on the wave equation in order to reduce the structural interpretation of seismic, in order to better carry out the processing and interpretation of seismic data, mainly the following aspects of the work and achieved certain results : (1) to achieve a numerical simulation of the wave equation, using the finite difference method for solving the wave equation, this method has a computing speed, take up memory small, can have a wide range of applicability for the near and far field and complex boundary accurately The simulation of the propagation of waves in the formation of a variety of media, and the complex structure. (2) a numerical simulation based on the wave equation seismotectonic fine interpretation techniques, frequency - wavenumber domain one-way wave equation seismic numerical modeling, by contrast analog recording and offset ago, after the reflection characteristics of the seismic profile, successive modify the the seismotectonic interpretation model, resulting in the final fine structure interpretation of the results. The technology uses frequency - wavenumber domain one-way wave field continuation operator is calculated, not only computationally efficient, but also high signal-to-noise ratio of recorded wave field simulation, to facilitate the target geological effective reflection wave field characteristics contrast. The technology makes full use of the offset before and after the seismic profile reflection characteristics help reduce seismic structural interpretation of multiple solutions, fine seismic structural interpretation model. (3) is derived and frequency - wavenumber domain numerical simulation to achieve a one-way wave equation the speed error geological interpretation, analysis of migration velocity errors exist in the case, depth migration is more sensitive to the speed error. Triangle geological model experimental quantitative research from the speed of large and small errors caused by the two aspects of the migration velocity depth migration error, and summarizes the relevant law, the statistical variation specific as well as the thickness of the top and bottom how much the amount of change, for example, the thickness of the offset due to such increased proportional migration velocity ratio proportional migration velocity decreases error to be large, the speed of 110% offset caused offset the offset of the error in thickness of greater than 90% speed. Migration velocity error, but also affects the reflection characteristics of the strata below. When the migration velocity than the true speed of less than 80%, there will be the below the stratigraphic not clear imaging. And can be verified by actual reef model experiments, so that we have a deeper understanding of the actual seismic data processing and interpretation guidance from the quantitative point of view. (4) derivation and numerical simulation of the two-way wave equation finite difference method, starting from the point of view of practical application, through the two-way acoustic wave equation seismic numerical simulation of synthetic prestack seismic records, the time offset prestack record and depth migration processing, the corresponding structural section, is used to verify the interpretation results and analysis layer bit explain the error geological interpretation of the wave equation prestack depth migration technology to solve complex structure and speed lateral variation violent earthquake data imaging ideal technology for complex high precision structural interpretation and geological interpretation provides reliable guarantee, interpretation of seismic exploration has played a certain role in guiding and interpretation has a certain reference value.

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