A Weighted Closure-Phase Statics Correction Method: Synthetic and Field Data Examples

A Weighted Closure-Phase Statics Correction Method: Synthetic and Field Data Examples
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加权闭合阶段静力学校正方法:综合和现场数据示例

DOI:
10.1109/tgrs.2022.3169519
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发表时间:
2022
影响因子:
8.2
通讯作者:
Lulu Liu
Lulu Liu
中科院分区:
工程技术1区
文献类型:
--
作者:
Han Yu;Sherif M. Hanafy;Lulu Liu

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由于复杂的地质条件,如沉积厚度的横向变化或复杂的地形,记录的地震图通常会因静校正而失真。这些失真和不连续的信号通常存在于波的到达时间或振幅中,并且它们最有可能沿着其相关的射线路径作为速度扰动而被涂抹。因此,静校正可能使目标体的图像模糊,或者更糟的是,将意外的和虚假的异常引入地下结构。为了部分解决这个问题,我们开发了一种加权静校正方法来估计不必要的时间偏移的轨迹使用闭合相位技术,这是利用在天文成像。在所提出的方法中,源和接收器静校正被视为独立的量,有助于基于其采集几何的波形偏移。数值试验的合成和现场的情况下,显着的,虽然逐渐的,改善数据质量相比,传统的加减(PM)方法。一般来说,这种方法提供了一种简单的策略,重新编辑地震剖面中的旅行时间,而无需反演近地表速度模型。它还可以推广到地震资料处理中任何满足闭合相位条件的干涉测量方法。
Recorded seismograms are usually distorted by statics owing to complex geological conditions, such as lateral variations in sediment thickness or complex topographies. These distorted and discontinuous signals usually exist in either arrival times or amplitudes of waves, and they are most likely to be smeared as velocity perturbations along their associated raypaths. Therefore, statics may blur images of the target bodies or, even worse, introduce unexpected and false anomalies into subsurface structures. To partly resolve this problem, we develop a weighted statics correction method to estimate unwanted temporal shifts of traces using the closure-phase technique, which is utilized in astronomical imaging. In the proposed method, the source and receiver statics are regarded as independent quantities contributing to the waveform shifts based on their acquisition geometries. Numerical tests on both the synthetic and field cases show noticeable, although gradual, improvements in data quality compared to the conventional plus–minus (PM) method. In general, this method provides a straightforward strategy to reedit the travel times in seismic profiles without inverting for a near-surface velocity model. Moreover, it can be extended to any interferometrical methods in seismic data processing that satisfies the closure-phase conditions.
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