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The Application Research Of Seismic Forecasting Techniques And Analysis By Seismic Sedimentology With Lithology Reservior

Posted on:2010-10-27Degree:DoctorType:Dissertation
Country:ChinaCandidate:X L LiFull Text:PDF
GTID:1100360302458781Subject:Earth Exploration and Information Technology
Abstract/Summary:PDF Full Text Request
The application of seismic prediction technology and analysis of seismic sedimentology with lithology,aim at resolving the practical problems in lithologic reservoir exploration and development of Daniudi gas field by using seismic sedimentology analysis method and seismic prediction technology.The first part of the paper researches the application of a series of matching technology, including improving resolution under wells controlling, improving resolution by spectra inversion, subtracting coal seam by wavelet decomposition and reconstruction, detecting reservoir heterogeneity by high-order statistic of seismic data, inversion of seismic data by using colored inversion, and gas bearing detection. The second part uses seismic sedimentology analysis method to transform the strata slice graph (seismic attribute graph) to sedimentary facieses planar graph by calibrating the single well sedimentaty facies and to predict the beneficial developed area of lithologic reservoir. The third part designs technical route and research steps of predicting lithologic reservoir based on front two parts and combining with actual data and geological tasks, and finally verifies the prediction effect by tracking analysis of a following well. The main research results and conclusions are as follows:1. Wavelet decomposition and reconstruction technique is effective to highlight the sandstone reflection of Taier member by suppressing the strong reflection of coal seam. Resolution improving under wells controlling technique is effective to maintain the relativeness of waveform and amplitude although the ability of resolution improving is limited. It can be used for the attribute calculating of waveform, amplitude, frequency and phase. Spectral inversion technique is better in improving resolution and no better than the prior in maintaining the relativeness of amplitude. The processing results can only be used for acoustic impedance inversion.2. The spectrum signature of gas bearing reservoir is characterized by attenuating in high frequency and increasing in low frequency. The area differential technique is sensible to gas bearing reservoir and has little ambiguity. The instant bandwidth technique has ambiguity in detecting gas bearing abnormity although it is effective.3. The colored inversion technique, which is not dependent on the model horizon and wavelet extraction, is suitable for predicting lithologic reservoir in fluvial facieses which lateral changes is fast. The predicted border of reservoir is clear. The inversion result, which is relative impedance, can be used to sand body depicting and sand body thichness predicting after adding low frequency information. But the vertical resolution is relatively low.4. This paper presents a reservoir heterogeneity research method basing on the high-order cumulant analysis of seismic data. Theoretical model and actual data proved the high-order cumulant attribute is effective for detecting the reservoir horizontal heterogeneity.5. The analysis method of seismic sedimentlogy is an effective tool of lithology reservoir prediction. The core content is determining the sedimentary isochronous surface and establishing isochronous stratigraphic framework. The core technology is forming strata slice cube and extracting attribute in minimal isochronous unit. The core purpose is dividing sedimentary micro-faces, optimization of beneficial developed area of lithologic reservoir, and sand body depicting under sedimentary facies control.6. The drilling result of D90 well proves the validity of favorable developed area of lithology reservoir predictions, the acoustic impedance inversion results of Taier member and Heyi member, and reservoir thickness distributing prediction.
Keywords/Search Tags:lithologic reservoir, seismic prediction technology, seismic sedimentology analysis, Daniudi
PDF Full Text Request
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