子波整形方法在大庆徐家围子深层气藏连片处理中的应用
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摘要
在连片处理中,关键因素是地震资料的波形一致性问题。在不同年度采集的多区块连片处理中,不同的激发因素和接收条件,会今导致原始数据在子波振幅、频率、相位等方面存在明显的差异。在常规处理中,多采用频率、反褶积等匹配方法,来调整不同震源、不同区块原始资料的频率和相位关系,但这种处理方式会影响叠前处理的效果。通过子波整形方法,可以有效地消除不同震源类型、不同区块等采集因素所造成的区块间波形差异,互相关系数达到0.9以上。该方法应用在大庆徐家围子的深层气藏十九个区块,满覆盖面积为5 058.8 km2三维大连片叠前偏移处理中,取得了明显的效果。
Waveform consistency is an important factor in seismic merging processing,the waveform difference is small in seismic data processing of single block because the properties of the sources and receivers are similar.The wavelet amplitude,frequency and phase are different in multi-blocks processing because the data acquisition is in different time and also,the data has different source and receiver properties.The method of frequency consistency,amplitude consistency and deconvolution are applied to adjust the relationship between wavelet frequency and phase for different seismic data and different blocks in conventional seismic data processing,but the above consistency processing can reduce the seismic data prestack processing quality.The unified waveform consistency processing is presented in this paper,the proposed method can eliminate the waveform difference which results from the source type and acquisition factor in different blocks,the crosscorrealtion coefficient of wavelet in different block is above 0.9,that means,the original data quality is kept efficiently during the course of prestack consistency processing.We have got good result in waveform consistency processing in 19 blocks,about 5058.8 km2 in Xujiaweizi,this is also the biggest 3D seismic onshore data merging processing in China.
Waveform consistency is an important factor in seismic merging processing,the waveform difference is small in seismic data processing of single block because the properties of the sources and receivers are similar.The wavelet amplitude,frequency and phase are different in multi-blocks processing because the data acquisition is in different time and also,the data has different source and receiver properties.The method of frequency consistency,amplitude consistency and deconvolution are applied to adjust the relationship between wavelet frequency and phase for different seismic data and different blocks in conventional seismic data processing,but the above consistency processing can reduce the seismic data prestack processing quality.The unified waveform consistency processing is presented in this paper,the proposed method can eliminate the waveform difference which results from the source type and acquisition factor in different blocks,the crosscorrealtion coefficient of wavelet in different block is above 0.9,that means,the original data quality is kept efficiently during the course of prestack consistency processing.We have got good result in waveform consistency processing in 19 blocks,about 5058.8 km2 in Xujiaweizi,this is also the biggest 3D seismic onshore data merging processing in China.
引文
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[4]云美厚,丁伟,王开燕,等.地震资料一致性处理方法研究与初步应用[J].石油物探,2008,45(1):65.
[5]王元波.三维地震处理连片拼接技术[J].大庆石油地质与开发,2001,20(3):67.
[6]王加海,秦文明,黄棱,等.三维连片处理技术在吉林探区的应用[J].天然气工业,2007,27(增刊A):130.
[7]吴琼,杨长春,张文忠,等.过渡带拼接地震资料处理方法研究[J].地球物理学展,2008,23(3):761.
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