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    • 38. 发明授权
    • Marine seismic acquisition system and method
    • 海洋地震采集系统及方法
    • US06684160B1
    • 2004-01-27
    • US09673491
    • 2000-10-16
    • Ali OzbekJames MartinNils LundeSimon Hastings Bittleston
    • Ali OzbekJames MartinNils LundeSimon Hastings Bittleston
    • G01V136
    • G01V1/364G01V1/201G01V2210/3246
    • A method and system for performing a marine seismic survey is described, including towing at least one seismic streamer comprising a plurality of hydrophones distributed at average intervals of not more than 625 cm therealong in the water over the area to be surveyed; directing acoustic signals down through the water and into the earth beneath; receiving with the hydrophones seismic signals reflected from strata in the earth beneath the water; digitizing the output of each hydrophone separately; and filtering the output to reduce the noise present in the output and to generate a signal with a reduced noise content wherein the filtering process uses as further input the digitized output of at least one nearby hydrophone. The filtering is applied to single sensor recording prior to group-forming and thus able to detect and reduce coherent noise with a coherency length of 20 meters or less. It reduces noise such as streamer or bulge noise.
    • 描述了一种用于进行海洋地震勘测的方法和系统,包括牵引至少一个地震拖缆,该地震拖缆包括在被测区域内的水中不超过625cm的平均间隔分布的多个水听器; 将声学信号引导通过水并进入下面的地球; 接收水中的地震信号反射的水听器; 分别对每个水听器的输出进行数字化; 并且对输出进行滤波以减少输出中存在的噪声并产生具有降低的噪声含量的信号,其中滤波处理用作进一步输入至少一个附近水听器的数字化输出。 滤波在组成形之前应用于单传感器记录,因此能够以20米或更小的相干长度检测和减少相干噪声。 它可以降低诸如飘带或凸起噪音等噪音。
    • 39. 发明授权
    • Adaptive seismic noise and interference attenuation method
    • 自适应地震噪声和干扰衰减方法
    • US06446008B1
    • 2002-09-03
    • US09700440
    • 2000-12-07
    • Ali Ozbek
    • Ali Ozbek
    • G01V136
    • G01V1/364G01V2210/3246
    • A method relating to filtering coherent noise and interference from seismic data by constrained adaptive beamforming is described using a constraint design methodology which allows the imposition of an arbitrary predesigned quiescent response on the beamformer. The method also makes sure that the beamformer response in selected regions of the frequency-wavenumber space is entirely controlled by this quiescent response, hence ensuring signal preservation and robustness to perturbations. Built-in regularization brings an additional degree of robustness. Seismic signals with arbitrary spectral content in the frequency-wavenumber domain are preserved, while coherent noise and interference that is temporarily and spatially nonstationary is adaptively filtered. The approach is applicable to attenuation of all types of coherent noise in seismic data including swell-noise, bulge-wave noise, ground-roll, air wave, seismic vessel and rig interference, etc. It is applicable to both linear and a real arrays.
    • 使用约束设计方法描述了通过受约束的自适应波束成形来过滤相干噪声和来自地震数据的干扰的方法,其允许在波束形成器上施加任意的预设计的静态响应。 该方法还确保频率 - 波数空间的选定区域中的波束形成器响应完全由该静态响应控制,从而确保信号保持和对扰动的鲁棒性。 内置正则化带来更多的鲁棒性。 在波数域中具有任意频谱含量的地震信号被保留,而临时和空间不稳定的相干噪声和干扰被自适应滤波。 该方法适用于地震数据中所有类型的相干噪声的衰减,包括波浪噪声,凸波噪声,地面波,空气波,地震船和钻机干扰等。它适用于线性和实数阵列 。
    • 40. 发明授权
    • Noise filtering method for seismic data
    • 地震数据噪声滤波方法
    • US5971095A
    • 1999-10-26
    • US91895
    • 1998-06-23
    • Ali Ozbek
    • Ali Ozbek
    • G01V1/36G01V1/00
    • G01V1/364G01V2210/324G01V2210/3246
    • A method for filtering noise from discrete noisy seismic signals in a time interval ([1, . . . , T]) is provided. The method comprising the steps of using the noisy seismic signals for determining at least one reference channel (x(t)) for the time interval as an estimate of the noise; determining coefficients for M temporally local filters (w(i, t)), the filters forming a filter bank, and M being a number equal to or larger than two, by minimizing a cost function (J(t)) representing a measure of the error of the output of the filter bank, and applying the filter bank to at least one estimate (x(t)) to determine M filtered estimates of the noise. The filtered estimates are multipled with temporal windows (h(i, t)).
    • PCT No.PCT / GB97 / 00055 Sec。 371 1998年12月7日第 102(e)日期1998年12月7日PCT 1997年1月8日PCT PCT。 公开号WO97 / 25632 日期1997年7月17日提供了一种用于在时间间隔([1,...,T])中对来自离散噪声地震信号的噪声进行滤波的方法。 该方法包括以下步骤:使用噪声地震信号来确定时间间隔的至少一个参考信道(x(t))作为噪声的估计; 确定M个时间局部滤波器(w(i,t))的系数,形成滤波器组的滤波器,M是等于或大于2的数字,通过最小化代表功率(J(t))的成本函数 滤波器组的输出的误差,以及将滤波器组应用于至少一个估计(x(t))以确定噪声的M个滤波估计。 滤波估计与时间窗(h(i,t))相乘。