APPLICATION OF TIME-FREQUENCY ANALYSIS TO THE MESOZOIC RESERVOIR, EASTERN DEPRESSION OF NORTH YELLOW SEA
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摘要: 北黄海东部坳陷有利勘探区块为发育在斜坡上的扇三角洲沉积相,砂岩储层薄,横向变化大,利用常规的地震属性难以圈闭有利储集层,时频分析技术是寻找薄储层最有利的手段。通过研究短时窗傅里叶变换、连续小波变换、时频连续小波变换和S变换等几种经典时频分析方法的特点,分别从时间分辨率、频率分辨率总结了各自的优缺点和适应性,最后优选出S变换对北黄海东部坳陷地震资料进行频谱分解。结果表明,该项技术提高了地震分辨率,对地层细节的刻画更清晰,有效地识别了断层边界,并且能够预测储集层的沉积环境变化及沉积相划分,频谱分解方法是该研究区进行储层预测的新方法和新手段。Abstract: The favorable exploration blocks in the eastern depression of the North Yellow Sea are developed on the slopes of a fan-delta. Sandstone reservoisr are thin in thickness with large lateral stratigraphic variations, It is difficult to define the favorable reservoirs by conventional seismic attributes method, Howeoer Time-frequency analysis technology is the best approach for the thin bed reservoirs. By studying on the characteristics of classic time-frequency analysis method, such as Short Time Fourier Transform, Continuous Wavelet Transform, Time-Frequency Continuous Wavelet Transform and S Transform, we summarized their advantages and disadvantages and the adaptability of time resolution and frequency resolution, optimized the S transform applied in the seismic data spectrum decomposition. The actual application shows that, the seismic resolution is much improved.It man describe the formation details more clearly and identify the fault boundary more effectively, also can predict the changes in sedimentary environment and classify the sedimentary facies division, the spectral decomposition is the new methods and new technology for reservoir prediction in this area.
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Keywords:
- The North Yellow Sea /
- eastern depression /
- time-frequency analysis /
- reservoir
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