Dynamic analysis of deep-towed seismic array based on relative-velocity-element-frame. (15th December 2020)

• Record Type: Journal Article
• Authors: Zhu, Xiangqian; Wang, Yanfeng; Yu, Kaiben; Pei, Yanliang; Wei, Zhengrong; Zong, Le
• Is Part Of: Ocean engineering. Volume 218(2020)
• Publication Date: 2020-12-15
• Subjects: Deep-towed seismic array -- Position predication -- Dynamic analysis -- Inversion calculation -- Design study; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2020.108243
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: Before analyzing the distribution of submarine minerals, the positions of hydrophones installed in seismic array cables must be known. Generally, the hydrophone positions are computed through inversion calculation based on assumptions that conflict with the facts, and some assumed parameters are adjusted repeatedly to reduce the spatial aliasing in seismic reflection profiling. Furthermore, the inversion calculation cannot study the relations between the cable shape and working conditions. Dynamic analysis is proposed to predict the hydrophone positions and investigate these relations herein. The array cable is modeled by the lumped mass method with respect to the relative-velocity-element-frame. The results of the dynamic analysis and inversion calculation are verified using the recorded depth data. Although the cable shape by inversion calculation is the same as that by dynamic analysis, the cable depth by inversion calculation demonstrates an obvious shift in comparison with the depth data; meanwhile, the results obtained via dynamic analysis match well with the depth data. Additionally, three virtual maneuvers—diving and rising, depth change, and lateral current—are designed to study the relation between the cable shape and working conditions. The obtained results may help guide exploration and promote the development of exploration equipment. Highlights: Dynamic analysis is proposed to predict the positions of hydrophones for deep-towed seismic array. Dynamics of the array cable is considered by using lumped mass method with respect to the relative-velocity-element-frame. Advantages of dynamic analysis compared to the inversion calculation are verified by depth data in one sea trial. Relations between the cable shape and the interference factors are studied by three virtual maneuvers.