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Study on High-precision Method of Shallow Profile Seismic Data Processing and Interpretation

Author: ZhuLin
Tutor: LiuHuaiShan
School: Ocean University of China
Course: Earth Exploration and Information Technology
Keywords: Shallow sectional High resolution seismic Handle Explanation
CLC: P631.4
Type: Master's thesis
Year: 2010
Downloads: 295
Quote: 2
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Abstract


The The shallow stratigraphic profiling is a water-based acoustic principles, continuous method for detecting a moving vessel, use of high-frequency energy acoustic emission transducer focal corresponding high-frequency sound receiver transducer to obtain higher resolution profile. Light cross-sectional data, usually obtained only after the subsequent treatment of the acquisition system, a single approach. Offshore operations, due to a variety of noise interference, low signal-to-noise ratio of the data, deep phase continuity poor geological features is not obvious, and sea multiples development makes effective the tracking layers bit more difficult. Light-sectional data interpretation has been explained to manually horizon calibration and structural interpretation, the method can not interact with the seismic data using vertical and horizontal measuring line, less efficient, heavy workload, and not easy to identify a small structure, the interpretation of the information accuracy is not high enough. Firstly, in dealing with aspects of light-sectional data inadequacies, based on field data, the analysis of the seismic characteristics of the shallow stratigraphic section, based on the theory of high-precision seismic exploration, research, and practical approach and fidelity to form The high-precision processing flow of a shallow-sectional data. Shallow-sectional data with a high resolution, the principles of its high-precision processing based denoising, mainly to improve data signal-to-noise ratio, taking into account the resolution, as far as possible to ensure data fidelity. In noise suppression, the integrated use of the various pressure noise methods, such as band-pass filtering, and the weighted sum the FK domain signal enhancement and adjacent channel, etc., the selection of parameters of the processing method is the key to high-precision processing; based on the formation of multiple Mechanism and shallow-sectional characteristics apply predictive deconvolution backlog system multiple waves, a reasonable choice of parameters, under the condition of ensuring the resolution, the effective suppression of the seabed reverberation and gentle formation multiple interlayer; Finally according to the need to use time-varying spectrum the albino further improve the profile resolution to improve the signal-to-noise ratio with random noise attenuation profile last modified. Set process flow the shallow-sectional data only after simple treatment of the acquisition system, and the status of a single post-processing method, technically supplement. Shallow cross-sectional data interpretation for the first time the use of 3D visualization techniques and seismic attribute technology, give full play to the advantages of the seismic data of the vertical and horizontal measuring line. Conventional horizon calibration method, for example, time-depth conversion wave group characteristics method and regional geological inference method, combined with regional geological data and drilling data, in the horizon on the basis of the calibration, combined with 3D visualization technology and seismic attributes technology, three-dimensional display of the destination layers, integrated all seismic information to improve the reasonableness and accuracy of the interpretation, and the layer bit between the rms amplitude of the research horizon lithology changes shallow strata finely divided and description. Fault interpretation need flexible selection method according to the characteristics of the profile, the available pumping gather large fault increases channel spacing, the more obvious large fault, small faults can be integrated to the formations on the same axis changes and changes in adjacent survey lines OK; fault plane combination of regularity and coherence cube technology combined fault plane combinations work. In contrast to shallow-sectional data only explain the personnel manual interpretation of the status quo, not only improve the efficiency, but also improve the accuracy.

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