Seismic imaging of S-wave structures of shallow sediments in the East China Sea using OBN multicomponent Scholte-wave data
Seismic imaging of S-wave structures of shallow sediments in the East China Sea using OBN multicomponent Scholte-wave data
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利用OBN多分量Scholte波数据对东海浅层沉积物横波结构进行地震成像
DOI：
10.1190/geo2019-0639.1
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发表时间：
2020-11
期刊：
影响因子：
3.3
通讯作者：
Yuzhu Liu
中科院分区：
文献类型：
--
作者：
Wang Yuan;Zhiwei Li;Jianhua Geng;Qingyu You;Tianyao Hao;Hu Yaoxing;Zhao Chunlei;Zhang Yan;Yuzhu Liu
浅海沉积物的横波结构对于近海岩土工程研究、地壳深部横波成像、多分量地震勘探和水下声学研究具有重要意义。本文将多分量Scholte波分析技术应用于东海浅海主动源地震剖面。Scholte波已被激发的镜头从一个5450英寸3气枪阵列和他们的记录已进行了在海底使用海底节点（OBN）。首先，我们提取共接收器道集（CRG）和校正的时间漂移，同时使用正，逆快速傅里叶变换恢复算法。地震传感器的三个CRG用于Scholte波分析。原始传感器CRG旋转到纵测线、横测线和垂直坐标系。利用内电罗盘测井值定向旋转后的倾斜角和横摇角，利用质点运动法估计炮点纵倾方位。然后，利用相移法从纵向和垂向分量计算速度谱。高Scholte波模式占主导地位的水平分量，而更强的基本模式占主导地位的垂直分量。采用多分量速度谱叠加方法生成最终的频散能量图像。在1.1-4.3 Hz频带内检索到多达四种模式的色散曲线。建立了多模态频散曲线反演方法，用于浅层沉积物成像。结果表明，东海浅海沉积物顶部0.5km范围内的流速为180-650 m/s，横向变化不大。该模型可为海上岩土工程勘察，特别是OBN多分量地震勘探数据处理提供重要参考。OBN的使用在[公式：见文本成像与Scholte波色散曲线反演相结合时，浅海沉积物具有很高的可行性。
The shear-wave (S-wave) structures of shallow marine sediments are important for offshore geotechnical studies, deep crustal S-wave imaging, multicomponent seismic exploration, and underwater acoustics studies. We have applied the multicomponent Scholte-wave analysis technique to an active-source shallow marine seismic profile in the East China Sea. Scholte waves have been excited by shots from a 5450 inch 3 air-gun array and their recordings have been conducted at the seafloor using ocean bottom nodes (OBNs). First, we extract the common-receiver gathers (CRGs) and correct for the time drift simultaneously using a forward and inverse fast Fourier transform resampling algorithm. Three CRGs of seismic sensors are used for Scholte-wave analysis. Raw sensor CRGs are rotated to the inline, crossline, and vertical coordinate system. The rotated tilt and roll angle are directed using the inner electric compass log value, and the shot inline azimuth is estimated using the particle motion method. Then, the velocity spectra are calculated from the inline and vertical components using the phase-shift method. Higher Scholte-wave modes dominate on the horizontal components, whereas the stronger fundamental mode dominates on the vertical components. The multicomponent velocity spectrum stacking method is adopted to produce the final dispersion energy image. Up to four modes of dispersion curves are retrieved within the 1.1–4.3 Hz frequency band. The multimode dispersion curve inversion is constructed for imaging the shallow sediments. The results suggest a low [Formula: see text of 180–650 m/s and few lateral variations within the top 0.5 km of shallow marine sediments in the East China Sea. This model can provide an important reference for offshore geotechnical investigations, especially for OBN multicomponent seismic exploration data processing. The use of OBNs has high feasibility in [Formula: see text imaging for shallow marine sediments when combined with the Scholte-wave dispersion-curve inversion.
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影响因子：
3.3
作者：
J. Carcione;H. B. Helle
通讯作者：
J. Carcione;H. B. Helle
DOI：
--
发表时间：
2012-05
期刊：
--
影响因子：
--
作者：
E. Pacal
通讯作者：
E. Pacal
DOI：
10.1190/1.3063805
发表时间：
2008
期刊：
Seg Technical Program Expanded Abstracts
影响因子：
--
作者：
F. Smit;C. Perkins;Laura Lepre;K. Craft;Reagan N. Woodard
通讯作者：
F. Smit;C. Perkins;Laura Lepre;K. Craft;Reagan N. Woodard
影响因子：
3.3
作者：
L. Amundsen;J. Robertsson
通讯作者：
L. Amundsen;J. Robertsson
DOI：
10.1190/1.3063804
发表时间：
2008
期刊：
Seg Technical Program Expanded Abstracts
影响因子：
--
作者：
A. Stopin;Mark Rae;Laura Lepre;Brenda Gaudin
通讯作者：
A. Stopin;Mark Rae;Laura Lepre;Brenda Gaudin