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Study and Suppression of Multiple Wave in Water Seismic Prospecting

Author: GongYue
Tutor: LeiWan
School: Chengdu University of Technology
Course: Earth Exploration and Information Technology
Keywords: Water seismic exploration Multiples Forecast minus method Feedback iteration method
CLC: P631.4
Type: Master's thesis
Year: 2011
Downloads: 38
Quote: 0
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Abstract

Had played an important role in the terrestrial survey engineering seismic exploration methods with the construction of bridges, docks, dams and other large buildings, extending to the waters of Investigation. A wider range of applications, mainly used in the identification of the layer thickness of the river bed cover, water depth, the ups and downs of the bedrock surface morphology and fault structure development characteristics. Exploration quality of the effect depends on the operating parameters of the selection signal-to-noise ratio improved. Provide accurate, complete geotechnical exploration data for engineering design in order to achieve the correct geological interpretation purposes, in various stages of seismic exploration to take the appropriate technical means to improve the resolution and explain the accuracy of its exploration, entirely necessary and quite urgent . Departure from the basic theory of seismic exploration, the first analysis of water seismic exploration, geological conditions relative onshore different, summarizes their strengths and weaknesses, and simulate several common geological structure theory earthquake response model for the actual situation. theoretical basis. More serious water seismic exploration data in multiple interference, in order to facilitate the identification and suppression of multiples, must ensure that the quality of the data acquisition, therefore, theoretically discussed the layout of the field data collection, including focal excitation sinking depth of strength, the source and the detector, the maximum offset and channel spacing selection parameter selection impact on the quality of the data collected, and summed up the best parameter selection method by theoretical calculations. In addition, field data collection, it is also faced with the positioning more difficult, in order to achieve a good acquisition effect, you must use the the onshore exploration positioning method, existing GPS positioning method to meet the basic needs of the exploration, The packet also existing localization methods are described. , At multiples of the basic theory and the basic characteristics and to identify a discourse to eliminate multiples introduced filtering method based on geometric seismology, in order to try based on the wave equation multiple suppression method, we use two dimensional finite difference method of synthetic seismogram. Most multiple wave generation is due to the strong free SAW impedance, so that the reflected wave in the vicinity of the free surface of a downward reflection propagated down to the interface of the deep portion is formed of multiple reflections, so suppression of such causes of multiple wave, that is, to suppress most of multiples, so free interface the downlink reflection formed multiple simulated using feedback model-based iterative inversion simulate multiple wave suppression effect is ideal , also shows the effectiveness of the pressing method. Based on the wave theory of repression multiple relatively sound in theory, the mathematical model of the spreadsheet has achieved good results, but the actual geological conditions than complex mathematical models, the amount of computation and high cost, the current only been applied in the area of ??large-scale oil and gas exploration, not yet introduced to the engineering seismic exploration in the past, due to the author's own conditions, using only a spreadsheet model, without application in the actual data processing Therefore, in the measured data filtering method based on geometric seismology to suppress multiple interference, and achieved good results.

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