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Study On The Amplitude-preserving High Resolution Processing In Tai30Area Of The Songliao Basin

Posted on:2014-02-14Degree:MasterType:Thesis
Country:ChinaCandidate:R ZhangFull Text:PDF
GTID:2230330395997663Subject:Earth Exploration and Information Technology
Abstract/Summary:PDF Full Text Request
The main features of the oil-gas deposit exploration in sogliao basin is the thinInterbeds of Sandstone and Mudstone, which is strong elusiveness and difficult to find, soamplitude-preserving high resolution pre-stack processing is a pre-condiction for thefine-description of reservoir. Through the detailed raw data analysis to the Tai30area, thepaper formed a series of processing methods including to high precision static correction,pre-stcking fidelity denoising, amplitude-preserving high resolution processing, andaccurate imaging, it had obtained better effection in lithologic interpretation.The amplitude-preserving high resolution processing has specific process, it mainlyconludes static correction, amplitude-preserving deconvolution and migration and so on.The high precision static correction technology applied the low frequency componentcomputed micro-logging and high frequency component computed tomographic staticcorrection to solve the static correction questions, moreover we test some parameters. Thepre-stcking fidelity denoising technology eliminate surface wave interference withsignal-noise separation technique, inhibit refraction noise with linear noise attenuationmethod, wipe out50HZ noise with signal frequency sel-adaption technology, attenuate theoil-field facility interference with frequency-division anomaly amplitude attenuationtechnology, attenuate the random anomaly amplitude with the surface consistent abnormalamplitude attenuation, meanwhile make use of manpower data rejection to solvepre-stacking denoising questions. In the energy compensation,we adopt seismic wavespherical spreading compensation method to compensate the amplitude energy in timederection, Surface consistent amplitude compensation to eliminates amplitude energydifference in spatial derection. The deconvolution methods contain step-by-step surfaceconsistent deconvolution and combination deconvolution method(surface consistentdeconvolution+predictive deconvolution), the method we applied can remove thewaveform horizontal inconsistencies caused surface factors, compress seismic wavelet forthe enhancement of vertical resolution. In real work we test different factor length,calculation windows and prediction step, After a series of trials we obtain suitabledeconvolution parameters. In the precise imaging we adopted3D anisotropic PSTMtechnology, it can eliminate the medium anisotropic effect, improve the seismic dataimaging precision further, make a breakpoint and section more clear, interlayer contactrelationships more clearly, obtain high resolution imaging.Based on the amplitude-preserving high resolution processing technology, we solvedthe seismic data amplitude energy, frequency and waveform consistency. these methodscan improve the vertical resolution, highlight wave group character of seismic section. The final result profiles show clear faults and abundant information to obtained goodeffects.
Keywords/Search Tags:amplitude-preserving, high resolution, static correction, denoising, deconvolution, precision imaging
PDF Full Text Request
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