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Accurate Source-Receiver Positioning Method for a High-Resolution Deep-Towed Multichannel Seismic Exploration System

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Journal of Ocean University of China 2024年第2期23卷 415-426页

作者： LI Jing LIU Kai WEI Zhengrong ZHANG Liancheng LIU Yangting pei yanliang LIU Chenguang LIU Baohua Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMNRQingdao 266061China Laboratory for Marine Geology Laoshan LaboratoryQingdao 266061China College of Ocean Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Fluid Transmission Technology of Zhejiang Province Zhejiang Sci-Tech UniversityHangzhou 310018China

The near-seabed multichannel seismic exploration systems have yielded remarkable successes in marine geological disaster assessment,marine gas hydrate investigation,and deep-sea mineral exploration owing to their high vertical and horizontal resolution.However,the quality of deep-towed seismic imaging hinges on accurate source-receiver positioning information.In light of existing technical problems,we propose a novel array geometry inversion method tailored for high-resolution deep-towed multichannel seismic exploration systems.This method is independent of the attitude and depth sensors along a deep-towed seismic streamer,accounting for variations in seawater velocity and seabed slope angle.Our approach decomposes the towed line array into multiline segments and characterizes its geometric shape using the line segment distance and pitch angle.Introducing optimization parameters for seawater velocity and seabed slope angle,we establish an objective function based on the model,yielding results that align with objective reality.Employing the particle swarm optimization algorithm enables synchronous acquisition of optimized inversion results for array geometry and seawater velocity.Experimental validation using theoretical models and practical data verifies that our approach effectively enhances source and receiver positioning inversion accuracy.The algorithm exhibits robust stability and reliability,addressing uncertainties in seismic traveltime picking and complex seabed topography conditions.

关键词： high-resolution deep-towed multichannel seismic exploration source-receiver positioning array geometry inversion seawater heterogeneity seabed slope angle

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On electro-acoustic characteristics of a marine broadband sparker for seismic exploration

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Journal of Oceanology and Limnology 2024年第3期42卷 760-771页

作者： Jing LI Kai LIU Liancheng ZHANG Chenguang LIU yanliang pei Baohua LIU Key Laboratory of Marine Geology and Metallogency First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory of Marine Geology Laoshan LaboratoryQingdao 266237China Key Laboratory of Fluid Transmission Technology of Zhejiang Province Zhejiang Sci-Tech UniversityHangzhou 310018China Key Laboratory of Submarine Acoustic Investigation and Application of Qingdao(Preparatory) Qingdao 266061China Key Laboratory of Deep Sea Mineral Resources Development Shandong(Preparatory)Qingdao 266061China

The construction of major marine infrastructure projects and the exploration and development of deep-sea mineral resources require fine imaging of seabed strata and structures.The highresolution marine seismic exploration based on a high broadband sparker source is an important approach to reveal seabed stratum and reservoir structure,and identify geohazard.To optimize the performance of sparker seismic source,we investigated the electro-acoustic characteristics of spark discharge under conditions of different charging voltages and electrode numbers.Results show that the sound source level increased with the increase of the charging voltage,whereas the main frequency decreased when the charging voltage increases.In addition,it was found that the charging capacitance had more obvious influence on the main frequency than the sound source level did.Although the load energy decreased with increasing electrode number,the sound source level still increased but the main frequency decreased.Meanwhile,the primary to bubble(P/B)ratio increased with the increase of the electrode number.To gain a deeper insight into the electro-acoustic characteristics,we investigate the relationship between sound source level and power peak,from which a good correlation was observed.A more practical statistical analysis on the rise rate of current was processed,and a perfect logarithmic function was derived.Furthermore,we found that the main frequency was most possibly subjected to the electrical energy,especially the charging energy per electrode.The results indicate that the charging energy per electrode less than 10 J could increase the main frequency to above 300 Hz.At last,the main frequency could be reduced to 20 Hz when the charging energy of a single-electrode discharge was enhanced to over 4 kJ.This study shall be helpful in developing a sparker seismic source and improving the performance for marine engineering exploration and geohazard assessment.

关键词： high-resolution marine seismic exploration sparker seismic source sound source level main frequency electro-acoustic characteristics

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The sound velocity and bulk properties of sediments in the Bohai Sea and the Yellow Sea of China

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Acta Oceanologica Sinica 2016年第7期35卷 76-86页

作者： ZHENG Jiewen LIU Baohua KAN guangming LI Guanbao pei yanliang LIU Xiaolei Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration State Oceanic Administration Qingdao 266061 China First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Qingdao National Laboratory for Marine Science and Technology Qingdao 266237 China National Deep Sea Center State Oceanic Administration Qingdao 266237 China Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of China Qingdao 266100 China

In order to investigate the correlation between a sound velocity and sediment bulk properties and explore the influence of frequency dependence of the sound velocity on the prediction of the sediment properties by the sound velocity, a compressional wave velocity is measured at frequencies of 25-250 kHz on marine sediment samples collected from the Bohai Sea and the Yellow Sea in laboratory, together with the geotechnical parameters of sediments. The results indicate that the sound velocity ranges from 1.232 to 1.721 km/s for the collected sediment samples with a significant dispersion within the series measuring frequency. Poorly sorted sediments are highly dispersive nearly with a positive linear relationship. The porosity shows a better negative logarithmic correlation with the sound velocity compared with other geotechnical parameters. Generally, the sound velocity increases with the increasing of the average particle size, sand content, wet and dry bulk densities, and decreasing of the clay content, and water content. An important point should be demonstrated that the higher correlation can be obtained when the measuring frequency is low within the frequency ranges from 25 to 250 kHz since the inhomogeneity of sediment properties has a more remarkably influence on the laboratory sound velocity measurement at the high frequency.

关键词： sound velocity particle composition physical properties frequency dispersion empirical equation

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Self-contained in situ sediment acoustic measurement system based on hydraulic driving penetration

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High Technology Letters 2011年第3期17卷 311-316页

作者： Kan Guangming Liu Baohua Zhao Yuexia Li Guanbao pei yanliang College of Marine Geosciences Ocean University of China Qingdao 266003 P.R. China Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration First Institute of Oceanography State Oceanic Administration Qingdao 266061 P.R. China

A novel self-contained in situ sediment acoustic measurement system based on hydraulic driving penetration is proposed to solve the problem of large disturbances to sediments of the in situ equipments already in existence. By using a hydraulic driving device, the system drives four acoustic probes into sediments at an even speed, and this decreases disturbances to sediments introduced by the penetration of acoustic probes. By means of the special design of the central control unit, the system can work full-automatically and the data are stored self-containedly, and this avoids the requirement of real-time remote controlling from the ship. Its operating water depth, measuring depth and measuring frequency is 500m, 1.0m and 30kHz respectively. A set of in situ sound speeds and attenuation coefficients of sediments are obtained at 40 stations using the system. The results confirm that the data obtained by the in situ sediment acoustic system are accurate and credible. Copyright © by HING TECHNOLOGY LETTERS PRESS.

关键词：液压驱动装置沉积物声学测量系统原位渗透数据存储设备中央控制单元声波探测器

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Assessment of structural stability in Bohai Sea area based on AHP-GDM model

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Acta Oceanologica Sinica 2013年第4期32卷 41-48页

作者： XIU Zongxiang LIU Baohua XIE Qiuhong LI Xishuang LIU Chenguang pei yanliang ZHENG Yanpeng The First Institute of Oceanography State Oceanic Administration Key Laboratory of Marine Sedimentology and Environmental Geology National Deep Sea Center

The AHP-GDM model is used for the assessment of structural stability, with the Bohai Sea area as an exam- ple. In this model, the credit degree of each expert is calculated through the assessment matrix based on the similarity and diversity of vector. The comprehensive opinions of expert panel are quantitatively obtained by considering the effect ofcredit degree. According to the geological structural setting, the Bohai Sea is di- vided into twelve assessment zones of structural stability by non-uniform element method. The structural stability grade of each zone is obtained on the basis of the latest geophysical data, earthquake statistical data, and the information of fault activities, current stress field and crustal deformation. The results show that there are one relatively stable area, three relatively sub-stable areas, six relatively sub-unstable areas and two relatively unstable areas. The assessment results of non-uniform element method are very close with those of uniform grid method with size of 0.25 in longitude direction and 0.14 in latitude direction. However the workload of non-uniform element method is only 1 / 16 of the latter. Compared with traditional assessment methods of structural stability, a more objective and reliable assessment result can be obtained by combining non-uniform element method and AHP-GDM model.

关键词： AHP-GDM Mode Bohai Sea structural stability non-uniform element method

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东印度洋东经90°海岭的地球物理特征和成因探讨

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海洋科学进展 2024年第3期42卷 515-531页

作者：朱佳豪裴彦良支鹏遥刘晨光刘焱光刘洋自然资源部第一海洋研究所山东青岛266061 崂山实验室海洋地质过程与环境功能实验室山东青岛266237 山东科技大学地球科学与工程学院山东青岛266590

东经90°海岭发育于东印度洋,自孟加拉沉积扇向南穿越赤道直至印度洋南部布罗肯脊,是世界上最长的线性构造。海岭的形成机制与东印度洋晚白垩世至新生代的多阶段演化有关,由于其跨越赤道、长度大于5 000 km,南北不同区域的构造背景较为... 详细信息

东经90°海岭发育于东印度洋,自孟加拉沉积扇向南穿越赤道直至印度洋南部布罗肯脊,是世界上最长的线性构造。海岭的形成机制与东印度洋晚白垩世至新生代的多阶段演化有关,由于其跨越赤道、长度大于5 000 km,南北不同区域的构造背景较为复杂,因此,其不同分段的地球物理特征也各具特色。通过分析海岭不同分段的形貌、浅层结构、重磁、地壳厚度及洋底年龄等地质地球物理数据,结合东印度洋海底扩张演化史,探讨了海岭的不同分段的成因机制。结果表明,90°E海岭的形成与板内热点活动、地幔柱-洋中脊相互作用、板块扩张与扩张中心跃迁,以及转换断层等诸多因素有关,是多种地质作用和地质过程综合作用的结果。2°N以北的海岭可能形成于远离扩张中心的印度板块内部,与板内火山作用有关联;18°S以南的部分形成于印度板块与南极洲板块边界转换断层附近;而2°N~18°S之间的中部区域则最为复杂,推测中段的形成受到了凯尔盖朗热点与沃顿扩张脊的相互作用,以及海岭下方的多次洋脊跳跃等因素的影响。分析认为,海岭中段是深入认识海岭成因机制、解决海岭构造演化和动力学机制以及脊-柱相互作用等重大科学问题的关键区域。未来在海岭中段开展地球物理测量及钻探工作,丰富海岭中段的地球物理综合数据,揭示中段不同位置岩石的物质组成与形成年代,是解决上述重大科学问题的必由之路。

关键词：东经90°海岭东印度洋热点活动构造演化

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Morphology and architecture of the typical erosion-genesis submarine canyons on the East China Sea slope

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Acta Oceanologica Sinica 2009年第6期28卷 42-52页

作者： LIU Baohua ZHAO Yuexia LI Xishuang KAN Guangming pei yanliang ZHENG Yanpeng First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration Qingdao 266061 China

The Yithi submarine canyons, composed of four canyons less than 60 km in length, are located on the narrowest part of the East China Sea （ECS） slope. They extend from the shelf break at 160 m down to water depth of 1 500 m with an average gradient （along the canyon axis） of 3°（〈1 000 m） and 0.7°（〈1 000 m）. The sinuosity of the canyons ranges form 1.02 to 1.14 and their pathways extend radially from the shelf break to the axis of the Okinawa Trough. Structural and evolution pattern of the Yithi canyons are mainly controlled by sediment mass-movements and turbidity current and similar with that of the canyons in Ebro continental slope. The whole canyon system consists of three parts： the canyon, the channel and the fan. Slumps and slides often develop in the upper part of canyon where the water depth is less than 1 000 m, and the turbidities usually developed on the fan. The scale of turbidites becomes smaller and their inner structures become more regular towards the ends of the canyons. Canyon-fans are often associated with small angle progradational reflection. Most canyon-fans and levees were transversely cut by active normal faults with NEE- SWW trending that are coupled to the modern extension of the Okinawa Trough. According to the age of formation of canyon-fans and sediments incised by canyons, we can infer that the Yithi canyons were formed since the middle the Medio-Pleistocene.

关键词： moroholouv architecture uenesis canyon the East China Sea slope

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Data processing of the Kuiyang-ST2000 deep-towed high-resolution multichannel seismic system and application to South China Sea data

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Journal of Oceanology and Limnology 2023年第2期41卷 644-659页

作者： yanliang pei Mingming WEN Zhengrong WEI Baohua LIU Kai LIU Guangming KAN Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 511458China College of Ocean Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Laoshan Laboratory Qingdao 266237Chin

The Kuiyang-ST2000 deep-towed high-resolution multichannel seismic system was designed by the First Institute of Oceanography,Ministry of Natural Resources(FIO,MNR).The system is mainly composed of a plasma spark source(source level:216 dB,main frequency:750 Hz,frequency bandwidth:150-1200 Hz)and a towed hydrophone streamer with 48 channels.Because the source and the towed hydrophone streamer are constantly moving according to the towing configuration,the accurate positioning of the towing hydrophone array and the moveout correction of deep-towed multichannel seismic data processing before imaging are challenging.Initially,according to the characteristics of the system and the towing streamer shape in deep water,travel-time positioning method was used to construct the hydrophone streamer shape,and the results were corrected by using the polynomial curve fitting method.Then,a new data-processing workflow for Kuiyang-ST2000 system data was introduced,mainly including float datum setting,residual static correction,phase-based moveout correction,which allows the imaging algorithms of conventional marine seismic data processing to extend to deep-towed seismic data.We successfully applied the Kuiyang-ST2000 system and methodology of data processing to a gas hydrate survey of the Qiongdongnan and Shenhu areas in the South China Sea,and the results show that the profile has very high vertical and lateral resolutions(0.5 m and 8 m,respectively),which can provide full and accurate details of gas hydrate-related and geohazard sedimentary and structural features in the South China Sea.

关键词： Kuiyang-ST2000 system deep-towed system seismic data process plasma spark source high resolution gas hydrate South China Sea

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腹腔镜根治性膀胱切除术中减少出血的技术改进168例报道

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微创泌尿外科杂志 2024年第1期13卷 45-48页

作者：欧炫蔚刘建和赵彦良周文博王光李沛石鑫李炯明昆明医科大学第二附属医院泌尿外科三病区昆明650101 祥云县人民医院泌尿外科祥云672199

目的:探讨有效减少腹腔镜根治性膀胱切除术(LRC)中出血的方法和技术。方法:回顾性分析2015年1月至2023年12月我院实施LRC手术的168例男性膀胱肿瘤患者。改进术中出血的方法包括切除膀胱前先阻断双侧脐动脉以减少膀胱和前列腺的血供;切... 详细信息

目的:探讨有效减少腹腔镜根治性膀胱切除术(LRC)中出血的方法和技术。方法:回顾性分析2015年1月至2023年12月我院实施LRC手术的168例男性膀胱肿瘤患者。改进术中出血的方法包括切除膀胱前先阻断双侧脐动脉以减少膀胱和前列腺的血供;切除闭孔淋巴结沿盆壁和骶骨前解剖层面进行,将闭孔淋巴脂肪组织整块游离至膀胱外侧,显露切断淋巴组织与盆壁和骶骨之间的血管交通支;精细解剖膀胱侧韧带及前列腺侧血管蒂,Hem-o-lok夹闭后切断;游离阴茎背深静脉复合体(DVC),充分显露两侧壁,缝扎后将其切断。结果:168例患者手术时间120~190 min,平均155 min。术中出血20~300 ml,平均86 ml,输血4.17%。术中无严重并发症、无中转开放手术。术后无继发性出血发生。结论:通过对术中控制出血方法和技术的改进,可有效减少LRC术中出血,降低严重术中并发症的发生。

关键词：膀胱肿瘤腹腔镜膀胱切除术出血

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Sea-surface acoustic backscattering measurement at 6–25 kHz in the Yellow Sea

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Acta Oceanologica Sinica 2020年第3期39卷 113-122页

作者： Lehua Qi Guangming Kan Baohua Liu yanliang pei Zhiguo Yang Shengqi Yu College of Marine Geo-sciences Ocean University of ChinaQingdao 266100China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China National Deep Sea Center State Oceanic AdministrationQingdao 266237China

Sea-surface acoustic backscattering measurements at moderate to high frequencies were performed in the shallow water of the south Yellow Sea, using omnidirectional spherical sources and omnidirectional hydrophones. Sea-surface backscattering data for frequencies in the 6–25 k Hz range and wind speeds of(3.0±0.5)and(4.5±1.0) m/s were obtained from two adjacent experimental sites, respectively. Computation of sea-surface backscattering strength using bistatic transducer is described. Finally, we calculated sea-surface backscattering strengths at grazing angles in the range of 16°–85°. We find that the measured backscattering strengths agree reasonably well with those predicted by using second order small-roughness perturbation approximation method with "PM" roughness spectrum for all frequencies at grazing angles ranged from 40° to 80°. The backscattering strengths varied slightly at grazing angles of 16°–40°, and were much stronger than roughness scattering. It is speculated that scattering from bubbles dominates the backscattering strengths at high wind speeds and small grazing angles. At the same frequencies and moderate to high grazing angles, the results show that the backscattering strengths at a wind speed of(4.5±1.0) m/s were approximately 5 d B higher than those at a wind speed of(3.0±0.5) m/s. However, the discrepancies of backscattering strength at low grazing angles were more than 10 d B. Furthermore the backscattering strengths exhibited no significant frequency dependence at 3 m/s wind speed. At a wind speed of 4.5 m/s, the scattering strengths increased at low grazing angles but decreased at high grazing angles with increasing grazing angle.

关键词： sea-surface acoustic scattering moderate frequency scattering model bistatic backscattering frequency dependence

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