海洋天然气水合物勘探地震处理的最小平方反滤波设计及其应用
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摘要
地震勘探的BSR识别技术是发现海洋天然气水合物的最经济、快捷、方便、有效的方法.在地震处理识别上,对子波的精确处理是水合物地震资料处理中最关键的一个环节,采用最小平方误差准则,即利用实际输出与期望输出的误差平方和为最小的条件,来确定反滤波因子,因此又称为最小平方子波整形.在地震处理程序中引入三种期望输出,即俞氏子波、雷克子波、Buttworth子波,对子波零相位化有较好的效果.根据上面的原理,我们开发了一套最小平方反滤波地震处理软件,对天然气水合物地震勘探资料进行试处理的结果表明,该软件在提高分辨率的同时保持了较高的信噪比.
In order to improve the resolution of seismic profiles in vertical, the aim of deconvolution is to suppress the ground filtering in exploration. The least-squares error is adopted, that is, considering sum of all anticipant output error as the least condition,to decide the inverse filtering factor. Three kinds of anticipation output is introduced: YU Shi wavelet ,Ricker wavelet, Buttworth wavelet. These wavelets help to improve the effect of zero-phase. According to the principle above, a software for least-squares-inverse filtering is developed. The results indicate this method not only improves the resolution but also maintains a relatively high ratio of signal-to-noise, especially in the detection of gas hydrate.
引文
[1] KVENVOLDENKA.Gashydrate———geologicalperspectiveandglobalchange[J].RevGeophys,1993,31:173—187.
    [2] 杨胜雄,张光学,张 明.海洋天然气水合物综合勘测技术[A].'99海洋高新技术发展研讨会论文集[C].北京:海洋出版社,2000.507—512.
    [3] MACKAYME,JARRARDRD,WESTBROOKGK,etal.Originofbottom simulatingreflectors:geophysicalevidencefromtheCascadiaaccretinaryprism[J].Geology,1994,22:459—462.
    [4] SINGHSC,MINSHULLTA,SPENCEGD.Velocitystructureofagashydratereflector[J].Science,1993,260:204—207.
    [5] LEEMW,HUTCHINSONDR,AGENAWF,etal.SeismiccharacterofgashydratesonthesoutheasternUScontinentalmargin[J].MarGeophysRes,1994,16:163—184.
    [6] CARCIONEJM,TINIVELLAU.Bottom simulatingreflectors:seismicvelocitiesandAVOeffects[J].Geophysics,2000,65(1):54—67.
    [7] HUNTERJM,MILLERRD,DOLLWE,etal.FeasibilityofhighresolutionP andS waveseismicreflectiontodetectmethanehydrate[J].SocExplGeophysExpandedAbstracts,1999.
    [8] 俞寿朋.高分辨率地震勘探[M].北京:石油工业出版社,1993.125.
    [9] 熊 翥.地震数据数字处理应用技术[M].北京:石油工业出版社,1993.187.
    [10] 牟永光.地震勘探资料数字处理方法[M].北京:石油工业出版社,1981.85.
    [11] 程乾生.信号数字处理的数学原理(第2版)[M].北京:石油工业出版社,1993.221.
    [12] 张光学,陈邦彦,杨胜雄,等.海洋天然气水合物地震学研究[A].天然气水合物调查动态、勘探方法和成果研讨会[C].2001.

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