离岸金融中心的地理学研究进展   总被引：1，自引：0，他引：1  

潘峰华  曾贝妮 《地理科学进展》2019,38(2):191-204

经济全球化是第二次世界大战后全球经济发展的特征,而金融国际化是其中重要的组成部分。离岸金融中心是在金融国际化和金融创新的背景下发展起来的,在促进资本流动与新兴金融市场发展中发挥重要作用。由于离岸金融中心独特的地理分布及其在全球经济和金融体系中的重要作用,离岸金融中心也开始受到地理学的关注。论文在对离岸金融中心的相关概念和发展进行介绍的基础上,系统回顾了离岸金融中心的地理学文献,从离岸金融中心产生的区位条件、离岸金融中心对全球和区域产生的影响、离岸金融中心与全球金融体系的互动关系、中国离岸金融中心的发展等方面对相关研究进行归纳,最后进行总结与评述,并对中国未来如何从地理学视角研究离岸金融中心给予展望。  相似文献   

Research on Motion Performance of the Mobile Double-Causeway Pier System     

余建星  田佳  徐金利  张翼飞  杨晓蓉  谭振东  董文斌  杜尊峰 《中国海洋工程》2008,22(2):267-276

Mobile offshore double-causeway pier system, a type of seashore unloading equipment, consists of two groups of multiple connected semi-submersible modules. This structure has wide application because most of the middle or mini type of vessels and ships can be moored to it. Based on the analysis of computational methods of multi-body motion response, a hydrodynamic model is set up and the three-dimensional potential theory in finite depth is adopted to calculate the three-dimensional motion response of this system. The double P-M spectrum is used to analyze the motion response in irregular waves. Different wave directions are specially taken into consideration, due to their various effects to the motion response. Furthermore, the calculated result is compared with that of the experiment, and it is proved that sway, heave, pitch and yaw motion are greatly constrained by mooring system. The comparison also indicates that the model can forecast the motion performance of the target, and that the calculated result can also be used as reference in connector and mooring system design.  相似文献   

海上气田排水采气工艺筛选     

杨志  ;于志刚  ;王尔均  ;左锋  ;廖云虎 《海洋地质译丛》2008,(3):55-59

气井出水是气田开发生产中后期面临的主要问题，对气井生产有着极大的影响，而排水采气工艺是解决气井出水和井筒积液的有效手段。国内外排水采气工艺技术较多，不同工艺技术有其自身的适应范围。从海上气田生产特点出发，通过对国内外多种成熟的排水采气工艺技术的选井原则、适用条件和经济适用性进行对比分析，筛选了适合海上气田的排水采气工艺技术，并重点对优选管柱一气举复合工艺的实施方案进行了分析，对海上气田出水后的高效开发具有重要的指导意义。  相似文献   

Dating of Dissolved Iodine in Pore Waters from the Gas Hydrate Occurrence Offshore Shimokita Peninsula,Japan: 129I Results from the D/V Chikyu Shakedown Cruise     

Hitoshi Tomaru  Udo Fehn  Zunli Lu  Rika Takeuchi  Fumio Inagaki  Hiroyuki Imachi  Ryosuke Kotani  Ryo Matsumoto  Kan Aoike 《Resource Geology》2009,59(4):359-373

Iodine concentration and radioisotopic composition (¹²⁹I/I) were measured in the pore waters from the gas hydrate occurrence in the forearc basin offshore Shimokita Peninsula, north-eastern Japan, to determine the source formation of I and accompanying hydrocarbons. Iodine concentrations correlate well with the alkalinity and SO₄ patterns, reflecting degradation stages of I-rich buried organic matter, rapidly increasing in the sulfate reduction interval, and becoming constant below 250 meters below the seafloor with an upwelling flux of 1.5 × 10⁻¹¹ µmol cm⁻² year⁻¹. The ¹²⁹I/I ratios of 300 × 10⁻¹⁵–400 × 10⁻¹⁵ in deep pore waters suggest ages for iodine and hydrocarbon sources as old as 40 Ma. These ages correlate well with the coaly source formations of the Eocene age thought to be responsible for the conventional natural gas deposits underlying the gas hydrate stability zone. Similar profiles are observed in ¹²⁹I/I ratios of pore waters in the gas hydrate stability zone from the forearc basin in the eastern Nankai Trough, offshore central Japan, where pore waters are enriched in I and reach ages as old as ∼50 Ma through the sediment column. At the outer ridge site along the trough, on the other hand, relatively younger I are more frequently delivered probably through thrusts/faults associated with subduction. The nature of source formations of I and hydrocarbons in the offshore Shimokita Peninsula has a more terrestrial contribution compared with those in the Nankai Trough, but these formations are also considerably older than the host sediments, suggesting long-term transport of I and hydrocarbons for the accumulation of gas hydrates in both locations.  相似文献   

中国东部海区科学钻探工程CSDP-02井钻探效率统计分析          下载免费PDF全文

翟育峰  张英传  田志超 《探矿工程》2019,46(12):13-17

CSDP-02井是中国东部海区科学钻探工程2井,该井采用五开结构,完井井径98 mm,完井井深2843.18 m,历时504 d,创造了海洋科学钻探全取心井深世界纪录。本文介绍了该井的施工过程,对该井的钻进时间、钻探效率和回次进尺长度进行了系统的统计与分析。通过分析,对影响海上深部科学钻探效率的海况、后勤保障等因素进行了简单的阐述,为提高海上深孔钻探施工效率提供了参考依据。  相似文献   

海洋钻井钻柱升沉补偿系统分析          下载免费PDF全文

秦如雷  许本冲  王嘉瑞 《探矿工程》2019,46(1):22-27

随着海洋资源勘探开发由浅海到深海逐渐增多,深水钻井面临的难题也不同于陆地与浅水,如何在随着波浪起伏的钻井平台上保持钻压稳定,钻柱升沉补偿系统应运而生。钻柱升沉补偿系统应用于浮式钻井平台或钻井船,在船受风浪影响起伏颠簸时可以使钻柱保持相对静止,使钻头与孔底保持持续接触,钻压保持基本恒定,起到保护钻具,提高钻进效率的作用。本文介绍了升沉补偿系统的发展阶段和常用升沉补偿系统结构及优缺点,通过示意图说明了主动补偿系统、被动补偿系统和主被动一体式补偿系统的工作原理。同时通过实例与数据说明升沉补偿系统在提高钻速和岩心采收率方面的积极作用。  相似文献   

海洋物探方法在海上风电场勘察中的应用     

刘彦华  杨晓军  袁超 《江苏地质》2019,43(4):619-626

海洋物探方法是海洋调查的主要方法,在海上风电地质勘察中得到了广泛的应用。在广东阳江沙扒海上风电场勘察中,通过浅地层剖面结合单道地震,查明了场区覆盖层厚度,绘制了基岩埋深图;采用多波束测深和侧扫声呐,并结合浅地层剖面探测和钻探取样成果查明了海底障碍物分布;通过浅地层剖面,初步查明了研究区浅层气分布范围;将海洋磁法成果绘制成研究区磁场等值线图。根据多波束测深、侧扫声呐、海洋磁法、浅地层剖面和单道地震等海洋物探方法特点,通过广东阳江沙扒海上风电项目,展示了应用海洋物探技术在海上风电勘察领域取得的成果。  相似文献   

Numerical studies on lateral load response of fin piles     

Kamsani Vinai Babu 《Geomechanics and Geoengineering》2019,14(2):85-98

In the recent past, in order to cater lateral loads, provision of fins to monopiles is evolving as an option for enhancing their lateral load capacity. Numerical and experimental studies pertaining to fin piles subjected to lateral loading are very limited. It is very difficult to understand the behaviour of fin piles through conventional soil pile theories, due to their different fin configurations. In the present study, three-dimensional finite element analyses were performed on regular piles (pile without fins) as well as fin piles. For fin piles, different fin lengths, orientation and position were considered during the analyses. The results have shown that fins placed at the top portion of the piles are more effective than fins placed at bottom of the pile. In all cases, fin piles exhibited more lateral load-carrying capacity compared to regular piles. When fin’s length is less than half of the pile length, lateral load-carrying capacity of fin piles is same irrespective of their orientation. However, fin’s orientation is significant, when fin length is more than 0.5 times length of piles, star fin piles exhibit more lateral load-carrying capacity compared to diagonal and straight fin piles. Fin piles experienced less bending moment compared to regular piles for a given lateral load. Further, it was also noticed that lateral load-carrying capacity of the fin piles depend upon fins’ length and their orientation.  相似文献   

美国API RP2A-WSD规范对我国海洋石油平台抗震设防的启示   总被引：3，自引：1，他引：2  

彭艳菊  吕悦军  唐荣余  沙海军 《地球物理学进展》2004,19(3):635-640

我国尚未制定海洋石油平台的抗震设计规范,目前世界海洋油气行业的抗震标准主要执行的是美国RP2A—WSD规范,该规范是基于是美国近海岸地震危险性区划结果而制定．本文介绍了RP2A-WSD规范及美国近海岸地震区划研究结果,论述了我国渤海海域地震活动性特性与地震动参数的研究内容,渤海海域是我国海洋石油开发的主要场所,且地震活动性较高,与美国南加利福尼亚近海岸具有可比性,然后对两者进行对比分析,并依据两者之间的对比结果,以及海洋石油平台的重要性和使用特征,对我国海洋石油平台的抗震设防标准和设防水准提出建议。  相似文献   

近海油气藏渗漏烃的检测方法综述   总被引：7，自引：0，他引：7  

吴传芝  赵克斌  丁相玉 《地质科技情报》2004,23(3):61-65

主要总结了海域油气藏渗漏烃的航空遥感和地球化学检测方法.遥感测量可以从宏观上圈定海面油膜的分布范围,是海上油气藏勘探前期常用的廉价方法;海底沉积物取芯测量和海水嗅探器现场分析是海域油气藏渗漏烃地球化学检测的主要手段,海水样品的脱气处理是海水介质中渗漏烃地球化学检测的关键环节;海水和海底沉积物取样设备与脱气技术的不断完善,为海域油气藏渗漏烃的检测提供了基本保障;目前,底层水采样分析与海底沉积物取芯分析已成为一种有效且相对经济的海域油气藏渗漏烃检测技术组合,与一些地球物理方法结合应用,可有效地圈定海底下方渗漏源的位置.  相似文献