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Petrology and geochemistry of serpentinized peridotites from Hahajima Seamount in Izu-Bonin forearc region

Acta Oceanologica Sinica 2019年第11期38卷 99-110页

作者： Tuoyu Wu Liyan Tian jinwei gao Yanhui Dong Beijing Maiqin Nengyuan Jishu Fuwu Co.Ltd Beijing 100004China Institute of Deep-sea Science and Engineering Chinese Academy of SciencesSanya 572000China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key Laboratory of Submarine Geosciences Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China

Serpentinites,which contain up to 13 wt%of water,are important reservoirs for chemical recycling in subduction *** the past two decades,forearc mantle serpentinites were identified in different locations around the ***,we present petrology and whole rock chemistry of ultramafic and mafic rocks dredged from the Hahajima Seamount,which is located 24–40 km west to the junction of the Izu-Bonin Trench and the Mariana *** all the collected samples are extensively hydrated,and olivine grains in ultramafic rocks are replaced by serpentine minerals,with only one sample preserving remaining trace of *** new results show that the Hahajima serpentinized peridotite samples are all MgO-rich(~42 wt%),but have low contents in Al2O3,CaO,rare earth and high field strength elements,which is consistent with the overall depleted character of their mantle *** calculations indicate that these Hahajima peridotite samples were derived from 10%–25%partial melting of the presumed fertile mantle source,which is generally lower than those of peridotites from Torishima Forearc Seamount,Conical Seamount and South Chamorro Seamount(mostly>25%).All the serpentinites from these four forearc seamounts show strong enrichment in fluid-mobile and lithophile elements(Li,Sr,Pb and U).In details,Hahajima Seamount serpentinites do not have obvious enrichment in Cs and Rb,and display remarkably high abundances of *** observations indicate that the serpentinization of Hahajima peridotites occurred by addition of seawater or low temperature seawater-derived hydrothermal fluid,without or with little contribution from slab-derived *** geochemical signature of serpentinites from Hahajima Seamount could be interpreted as the result of the combination of extensive partial melting and subsequent percolation of seawater through the mantle wedge.

关键词： Hahajima Seamount serpentinized peridotites IBM forearc seamounts fluid-mobile elements

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Geometry and 3D seismic characterisation of post-rift normal faults in the Pearl River Mouth Basin,northern South China Sea

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Acta Oceanologica Sinica 2024年第4期43卷 25-39页

作者： Yuanhang Liu jinwei gao Wanli Chen Jiliang Wang Umair Khan Laboratory of Marine Geophysics and Georesources Institute of Deep-sea Science and EngineeringChinese Academy of SciencesSanya 572000China University of Chinese Academy of Sciences Beijing 100049China

Based on high-resolution 3D seismic data acquired in the Pearl(Zhujiang)River Mouth Basin of the northern South China Sea,this study investigated the geometry,spatial extension,and throw distribution of the post-rift normal fault through detailed seismic interpretation and fault modeling.A total of 289 post-rift normal faults were identified in the study area and can be classified into four types:(1)isolated normal faults above the carbonate platform;(2)isolated normal faults cutting through the carbonate platform;(3)conjugate normal faults,and(4)connecting normal *** distribution analysis on the fault planes show that the vertical throw profiles of most normal fault exhibit flat-topped *** normal faults above the carbonate platform exhibit roughly concentric ellipses with maximum throw zones in the central section whereas the normal faults cutting through the carbonate platform miss the lowermost section due to the chaotic seismic reflections in the interior of the carbonate *** vertical throws of conjugate normal faults anomalously decrease toward their intersection region on the fault plane whereas the connecting normal faults present two maximum throw zones in the central section of the fault *** to the symmetric elliptical distribution model of fault throw,an estimation was made indicating that normal faults cutting through the carbonate platform extended downward between-1308 s and-1780 s(two-way travel time)in depth and may not penetrate the entire Liuhua carbonate ***,it is observed that the distribution of karst caves on the top of the carbonate platform disaccord with those of hydrocarbon reservoirs and the post-rift normal faults cutting through the carbonate platform in the study *** propose that these karst caves formed most probably by corrosive fluids derived from magmatic activities during the Dongsha event,rather than pore waters or hydrocarbons.

关键词： Post-rift normal faults fault throw Karst caves Corrosive fluids Pearl River Mouth Basin South China Sea

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Mixed Carbonate-Siliciclastic Deposits in a Channel Complex in the Northern South China Sea

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Journal of Earth Science 2018年第3期29卷 707-720页

作者： Benjun Ma Shiguo Wu Lijun Mi Thomas Lüdmann jinwei gao Wei gao Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Key Laboratory of Marine Georesources and Prospecting Institute of Deep-sea Science and Engineering Chinese Academy of SciencesSanya 572000China University of Chinese Academy of Sciences Beijing 100049China Functional Laboratory for Marine Geology and Environment Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China Shenzhen Branch China National Offshore Oil CorporationGuangzhou 510420China Institute of Geology Centre for Earth System Research and SustainabilityUniversity of HamburgHamburg 20146Germany

New high-resolution 3D seismic data image a submarine channel complex in the northern slope of the South China Sea. The channel complex stretches hundreds of kilometers across the slope and flows into the deepsea from the siliciclastic shelf margin, linking neritic environment to the pelagic plain. The evolution of the channel complex developed two sedimentary stages, stage Ⅰ （19.1-18.5 Ma） and stage Ⅱ （18.5-17.5 Ma）, separated by erosional surfaces. In the first stage, the complex was rifled with pure siliciclastic sediments, forming thick-massive sandstone intercalated by thin layers of mudstone. During the stage Ⅱ, the channel complex was deposited five carbonate-siliciclastic cycles. The unexpected channel-fifl carbonate deposits present allochthonous characteristics, suggesting the siliciclastic channel was surprisingly used to transport carbonate sediment from the adjacent neritic carbonate platform. By analyzing the periodical carbonate sedimentary process in the siliciclastic channel complex, we infer that it was related to the in situ carbonate production of the neritic carbonate platform and was most likely to be controlled by the relative sea-level changes. Unlike line-source carbonate slope aprons or smafl-sized carbonate channels, the large-sized siliciclastic channel complex links directly neritic carbonate platform to deepwater basin and can transport large volumes of neritic carbonates to the pelagic environment in a short period. The new findings help to estimate the contributions of neritie siliciclastic shelf and carbonate platform to deepwater slope more accurately. This study suggests that channel systems are more complex than expected and have significant implications on the conceptual models describing the deepwater sedimentary theory.

关键词： submarine channels mixed carbonate-siliciclastic deposits allochthonous carbonate sediment flux sedimentology South China Sea.

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Numerical Simulation of Mechanical Compaction of Deepwater Shallow Sediments

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Journal of Ocean University of China 2018年第1期17卷 53-64页

作者： SUN Jin WU Shiguo DENG Jingen LIN Hai ZHANG Hanyu WANG Jiliang gao jinwei Laboratory of Marine Geophysics&Geo-Resources Institute of Deep-Sea Science and EngineeringChinese Academy of SciencesSanya 572000China Qingdao National Laboratory for Marine Science and Technology Qingdao 266237China College of Earth Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China CNOOC China Limited Tianjin Branch Tianjin 300451China

To study the compaction law and overpressure evolution in deepwater shallow sediments, a large-strain compaction model that considers material nonlinearity and moving boundary is formulated. The model considers the dependence of permeability and material properties on void ratio. The modified Cam-Clay model is selected as the constitutive relations of the sediments, and the deactivation/reactivation method is used to capture the moving top surface during the deposition process. A one-dimensional model is used to study the compaction law of the shallow sediments. Results show that the settlement of the shallow sediments is large under their own weight during compaction. The void ratio decreases strictly with burial depth and decreases more quickly near the seafloor than in the deeper layers. The generation of abnormal pressure in the shallow flow sands is closely related to the compaction law of shallow sediments. The two main factors that affect the generation of overpressure in the sands are deposition rate and permeability of overlying clay sediments. Overpressure increases with an increase in deposition rate and a decrease in the permeability of the overlying clay sediment. Moreover, an upper limit for the overpressure exists. A two-dimensional model is used to study the differential compaction of the shallow sediments. The pore pressure will still increase due to the inflow of the pore fluid from the neighboring clay sediment even though the deposition process is interrupted.

关键词： mechanical compaction deepwater shallow sediments compaction law shallow water flow overpressure evolution

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The Seismogenic Structure of the 2010 Suining Ms 5.0 Earthquake and its Geometry,Kinematics and Dynamics Analysis

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Acta Geologica Sinica(English Edition) 2011年第6期85卷 1277-1285页

作者： LU Renqi HE Dengfa JOHN Suppe MA Yongsheng GUAN Shuwei SUN Yanpeng gao jinwei Institute of Oil and Gas School of Earth and Space Sciences Peking University Beijing 100871 China College of Energy Resources China University ofGeosciences Beijing 100083 China The Department ofGeosciences TaiWan University. TaiPei 13-318 China Oil fieldExploration Production Department SINOPEC Beijing 100728 China Research Institute of Petroleum and Development of China Beijing 100083 China

In January 2010, the Suining Ms5.0 earthquake occurred in central Sichuan Basin, with the epicenter in Moxi-Longnvsi structural belt and a focal depth of 10 km. Based on structural interpretations of seismic profiles in this area, we recognized a regional detachment fault located at a depth of 9-10 km in the Presinian basement of the Suining area, transferring its slipping from NW to SE orientation. This detachment fault slipped from NW to SE, and underwent several shears and bends, which caused the basement to be rolled in and the overlaying strata fold deformation. It formed a fault-bend fold in the Moxi area with an approximate slip of 4 km. Correspondingly, the formation of the Moxi anticline is related to the detachment fault. With the earthquake＇s epicenter on the ramp of the detachment fault, there is a new point of view that the Suining earthquake was caused by re-activation of this basement detachment fault. Since the Late Jurassic period, under the influence of regional tectonic stress, the detachment fault transfered its slip from the Longmen Mountains （LMS） thrust belt to the hinterland of the Sichuan Basin, and finally to the piedmont zone of southwest Huayingshan （HYS）, which indicates that HYS might be the final front area of the LMS thrust belt.

关键词： Suining Ms5.0 earthquake Seismic interpretation Detachment fault Moxi anticline Longmen Mountains Sichuan Basin

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Sediment Compaction and Pore Pressure Prediction in Deepwater Basin of the South China Sea: Estimation from ODP and IODP Drilling Well Data

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Journal of Ocean University of China 2018年第1期17卷 25-34页

作者： XIE Yangbing WU Tuoyu SUN Jin ZHANG Hanyu WANG Jiliang gao jinwei CHEN Chuanxu Laboratory of Marine Geophysics and Georesources Institute of Deep-Sea Science and Engineering Chinese Academy of Sciences Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology Department of Earth and Environment Sciences University of Windsor ON

Overpressure in deepwater basins not only causes serious soft sediment deformation, but also significantly affects the safety of drilling operations. Therefore, prediction of overpressure in sediments has become an important task in deepwater oil exploration and development. In this study, we analyze the drilling data from ODP Leg 184 Sites 1144, 1146, and 1148, and IODP Leg 349 Sites U1431, U1432, U1433, and U1435 to study the sediment compaction and controls in the northern South China Sea. Sedimentation rate, sediment content, distribution area, and buried depth are the factors that influence sediment compaction in the deepwater basin of the South China Sea. Among these factors, the sediment content is the most important. The fitted normal compacted coefficients and mudline porosity for an interval of 50 m shows disciplinary variation versus depth. The pore pressure predicted from different fitted results shows varying overpressure situations. The normal compaction trend from Site 1144 reflects the porosity variation trend in stable deposition basins in the northern South China Sea. The predicted pore pressure shows overpressure at Site 1144, which is attributed to compaction disequilibrium. Nevertheless, the mixed lithology column may influence the predicted overpressure at Site 1148, which is responsible for the confusing result. Above all, we find that sediment compaction should serve as a proxy for pore pressure in the deepwater basin of the South China Sea.

关键词： normal compaction pore pressure prediction deepwater basin South China Sea

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Creation and erasure of polar bubble domains in PbTiO_(3)films by mechanical stress and light illuminations

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Journal of Materiomics 2023年第4期9卷 626-633页

作者： Xingchen Zhang Hongying Chen Guo Tian Wenda Yang Zhen Fan Zhipeng Hou Deyang Chen Min Zeng Minghui Qin jinwei gao Xingsen gao Jun-Ming Liu Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials and Institute for Advanced Materials South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou510006China Laboratory of Solid-State Microstructures and Innovation Center of Advanced Microstructures Nanjing UniversityNanjing210093China National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringJiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing210093China

The controllable manipulation of polar topological structures(*** bubble)in ferroelectric materials have been considered as a cornerstone for future programmable ***,we present the effective creation and erasure of polar bubble states PbTiO_(3)(PTO)multilayers trigged by mechanical stress and light illumination,*** was found that applying atomic force microscope(AFM)tip force can induced formation of nanoscale bubble domains from the initial monodomain ***,the created bubble domain can be eliminated by exposure to ultraviolet or infrared light *** above results can be understood by modulation of depolarization screening charges and bias fields,as reflected by scanning Kelvin potential microscopic(SKPM)observations,whereby the flexoelectric effect from the tip force tends to remove the screening charges on top surface and modulate the bias field that favors the formation of bubble state while light illumination tends to recover the screen charges and favor the monodomain *** results provide a good example for multi-field manipulation of polar topologies,which might create a new avenue towards the immerging new concept electronic devices.

关键词： Ferroelectric films Polar topologies Piezoresponse force microscopy

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Pre-Drilling Prediction Techniques on the High-Temperature High-Pressure Hydrocarbon Reservoirs Offshore Hainan Island,China

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Journal of Ocean University of China 2018年第1期17卷 72-82页

作者： ZHANG Hanyu LIU Huaishan WU Shiguo SUN Jin YANG Chaoqun XIE Yangbing CHEN Chuanxu gao jinwei WANG Jiliang Laboratory of Marine Geophysics and Georesource Institute of Deep-Sea Science and EngineeringChinese Academy of ScienceSanya 572000China Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationOcean University of ChinaQingdao 266100China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China Shenzhen Branch of CNOOC Shenzhen 518000China College of Earth Sciences University of Chinese Academy of SciencesBeijing 100049China

Decreasing the risks and geohazards associated with drilling engineering in high-temperature high-pressure(HTHP) geologic settings begins with the implementation of pre-drilling prediction techniques(PPTs). To improve the accuracy of geopressure prediction in HTHP hydrocarbon reservoirs offshore Hainan Island, we made a comprehensive summary of current PPTs to identify existing problems and challenges by analyzing the global distribution of HTHP hydrocarbon reservoirs, the research status of PPTs, and the geologic setting and its HTHP formation mechanism. Our research results indicate that the HTHP formation mechanism in the study area is caused by multiple factors, including rapid loading, diapir intrusions, hydrocarbon generation, and the thermal expansion of pore fluids. Due to this multi-factor interaction, a cloud of HTHP hydrocarbon reservoirs has developed in the Ying-Qiong Basin, but only traditional PPTs have been implemented, based on the assumption of conditions that do not conform to the actual geologic environment, e.g., Bellotti's law and Eaton's law. In this paper, we focus on these issues, identify some challenges and solutions, and call for further PPT research to address the drawbacks of previous works and meet the challenges associated with the deepwater technology gap. In this way, we hope to contribute to the improved accuracy of geopressure prediction prior to drilling and provide support for future HTHP drilling offshore Hainan Island.

关键词： pre-drilling prediction techniques formation pore pressure high-temperature high-pressure hydrocarbon reservoirs Hainan Island Ying-Qiong Basin

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用可靠性理论解析API套管强度的计算公式

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石油学报 2007年第1期28卷 122-126页

作者：闫相祯高进伟杨秀娟中国石油大学研究生院山东东营257061 中国石油大学储运与建筑工程学院山东东营257061

针对美国石油学会(API)制定的套管强度计算公式中引用的若干个修正系数理论意义不明确的问题,讨论了API套管多个属性参量的分布规律和分布参数。采用基于Monte-Carlo方法的Latin Hypercube随机模拟方法,模拟得出了套管强度的分布规律以... 详细信息

针对美国石油学会(API)制定的套管强度计算公式中引用的若干个修正系数理论意义不明确的问题,讨论了API套管多个属性参量的分布规律和分布参数。采用基于Monte-Carlo方法的Latin Hypercube随机模拟方法,模拟得出了套管强度的分布规律以及套管几何尺寸和管材力学性能的随机性对套管强度随机性的影响规律。运用可靠性理论建立了套管强度的可靠度计算模型,分析并对比了不同可靠度下的套管强度值,计算得出了API套管强度值的可靠度。研究结果表明,套管属性的随机性越大,套管强度的可靠性越低,API套管弹性挤毁抗挤强度公式的修正系数能够合理地提高其强度可靠性,但应用修正系数后的抗内压强度公式是偏于安全的。

关键词：套管强度计算公式 Monte—Carlo方法可靠性理论修正参数

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基于风险矩阵和支持向量机的套管寿命预测

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石油机械 2010年第5期38卷 15-18页

作者：高进伟闫相祯中国石油技术开发公司中国石油大学(华东)储运与建筑工程学院

普通预测方法无法有效预测套管寿命,为此,建立了套管寿命预测模型。该模型基于支持向量机方法建立,通过对32个套管失效因素的影响等级及相应因素发生概率等级的定量分析,求得各因素对于套管失效影响的风险矩阵,并确定了油气井套管8种失... 详细信息

普通预测方法无法有效预测套管寿命,为此,建立了套管寿命预测模型。该模型基于支持向量机方法建立,通过对32个套管失效因素的影响等级及相应因素发生概率等级的定量分析,求得各因素对于套管失效影响的风险矩阵,并确定了油气井套管8种失效形式的危险性能指标。对60口非训练样本的套损井寿命进行预测,通过寿命预测值与现场实际寿命值的对比分析表明,该套管寿命预测方法对中长寿命油气井套管具有较高的预测精度。

关键词：套管失效风险矩阵支持向量机样本训练寿命预测

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