The application of geometric re-definition and sinking depth correction to the marine multi-channel short-array seismic reflection data

Zhang Sheng; Gao Jinyao; Ding Weifeng; Shen Zhongyan; Diao Yunyun

doi:10.3969/j.issn.0253-4193.2020.03.013

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Zhang Sheng，Gao Jinyao，Ding Weifeng, et al. The application of geometric re-definition and sinking depth correction to the marine multi-channel short-array seismic reflection data[J]. Haiyang Xuebao，2020, 42(3)：140–148，doi:10.3969/j.issn.0253−4193.2020.03.013

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The application of geometric re-definition and sinking depth correction to the marine multi-channel short-array seismic reflection data

doi: 10.3969/j.issn.0253-4193.2020.03.013

Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China

Received Date: 2019-01-02
Rev Recd Date: 2019-03-19

Available Online: 2020-11-18

Publish Date: 2020-03-25

Abstract

Abstract

Although the length of short array multi-channel streamers is limited,the absence of equipment for positioning and depth fixing, e.g., birds, magnetic compass, tail mark, etc., will bring some problems, such as inaccurate seismic geometric definition, to the subsequent procedure of data processing. In addition, different sinking depths without correction of depth fixing at different receiving sections along the short towing cable will destroy the relationship of the theoretical hyperbolic curve between time and distance. As to the short-array multi-channel seismic reflection data, therefore, we utilize the surveying navigation data to calculate the real shot track points, and then the interpolation algorithm weighted with inverse ratio of distance is employed to estimate the trajectory coordinates of the receiving points, which aids in obtaining the authentic geometric parameters of the total array. In order to resolve the distortion of time-distance curve caused by inconsistent depth of receiving cable, we calculate the theoretical reflecting positions of common mid-point (CMP) with hyperbolic curve and gauge the static correction of receiving arrays with different sinking depths. Finally, distortions of the reflection event caused by the non-uniform sinking depths of receiving array are eliminated by the fitting algorithm of static correction. The application of above processing processes to the short-array seismic reflection data collected in the Ross Sea, West Antarctica produces high-resolution stacked seismic reflection profiles, which provides great technical assistance for following work of geological interpretation.
- short array multi-channels seismic reflection,
- geometry,
- sinking depth correction,
- stacked section

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References(14)

References

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