Study on System of Faults in the Gulf of Mexico and Adjacent Region based on Gravity Data     

MA Jie  WANG Wanyin  DU Xiangdong  LUO Xingang  CAI Wenjie  YANG Min  WANG Dingding 《《地质学报》英文版》2021,95(1):305-318

In the Gulf of Mexico and adjacent landmasses,faults are very complex,and their distribution is closely related to plate tectonics,ocean-land boundary,and former structure.The plane position of the faults can be identified by the maximum characteristic of the vertical derivative of the normalized vertical derivative of the total horizontal derivative(NVDR-THDR)of the Bouguer gravity anomaly.The apparent depth of the faults is inverted by the Bouguer gravity anomaly curvature property.Based on tectonic evolutionary processes and the plane distribution and apparent depth characteristics of the faults,a complete fault system for the Gulf of Mexico and adjacent areas has been established,including 102 faults.The apparent depths of 33 first-class faults are 16-20 km and for 69 second-class faults are 12-16 km.The F_1-2and F_1-3subduction fault zones are two caused by the subduction of the Cocos Plate into the old Yucatan and Chorti landmasses;F_1-11and F_1-12fault zones extend westward to the coast of Guatemala and do not extend into the continent;F_1-17and F_1-20faults,which control the boundary of the oceanic crust,do not extend southward into the continent.The fault system,which radiates in a"fan-shaped"structure as a whole,unfolds to the northeast.Faults of different nature and sizes are distributed in the Cocos Plate subduction zone,Continental,Gulf of Mexico,Yucatan old landmass and Caribbean Plate in NW,NNW,NS,NE and NEE directions.In the Gulf of Mexico region,the fault system is a comprehensive reflection of former tectonic movements,such as plate movement,drift of old landmasses and expansion of oceanic crusts.The first-class faults control the plate and ocean-continental boundaries.The second-class faults are subordinate to the first-class faults or related to the distribution of different sedimentary layers.  相似文献   

暗目标法的Himawari-8静止卫星数据气溶胶反演   总被引：1，自引：0，他引：1  

葛邦宇  杨磊库  陈兴峰  李正强  梅笑冬  刘李 《遥感学报》2018,22(1):38-50

Himawari-8(H8)是由日本气象厅发射的新一代静止气象卫星,可实现10 min/次的高频次对地观测,搭载的AHI(Advanced Himawari Imager)传感器设置有与MODIS暗目标气溶胶反演算法所需的类似波段。本文参考暗目标算法构建了针对该卫星传感器的陆地气溶胶反演算法:首先,通过基于地基站点观测数据的精确大气校正,统计得到短波红外与可见光波段的地表反射率比值关系,将此作为先验知识用于地—气解耦时的反射率估计;然后,初步假设大陆型气溶胶类型,利用辐射传输模型建立查找表;最后,通过模拟与卫星观测的表观反射率误差最小实现气溶胶光学厚度反演解算。选取2016年5月覆盖京津冀地区的观测数据进行测试,将反演结果与对应时间的MODIS气溶胶光学厚度产品进行对比验证,空间分布趋势一致、相关性较高,相关系数R达到0.852;通过与地基观测网AERONET站点实测数据对比验证,所有站点的相关系数R~2均大于0.88,精度较高。利用反演的高时间分辨率产品,分析了京津冀地区的大气空间分布和日变化情况,结果表明:采用暗目标法对H8静止卫星陆地气溶胶光学厚度反演具有一定的潜力和可行性,能反映气溶胶的高时间变化信息,有望成为大气环境污染变化监测新的重要手段。  相似文献   

A new global ocean hydrographic climatology          下载免费PDF全文

GOURETSKI Viktor 《大气和海洋科学快报》2019,(3):226-229

This report describes the main features of the recently published World Ocean Experiment–Argo Global Hydrographic Climatology. This climatology is based on profile data from ships, Argo floats, and sensors attached to marine mammals. As an important deviation from the widely used climatologies produced previously by the National Oceanographic Data Center, the spatial interpolation was performed on local potential density surfaces, so that no ‘artificial water masses’ were created. In addition to monthly fields of temperature and salinity, gridded maps of the upper mixed layer depth are now provided.  相似文献   

Effect of model errors in ambient air humidity on the aerosol optical depth obtained via aerosol hygroscopicity in eastern China in the Atmospheric Chemistry and Climate Model Intercomparison Project datasets          下载免费PDF全文

CHANG Wenyuan 《大气和海洋科学快报》2019,(3):162-169

当前全球气候模式普遍低估中国东部气溶胶光学厚度(AOD)。本文表明,模式低估中国东部地表大气相对湿度是AOD低估的原因之一。研究基于国际大气化学气候模式比较计划的干气溶胶质量浓度结果,用再分析湿度数据替换模拟湿度以计算AOD变化。结果表明,替换后我国大气相对湿度增加,多模式平均的华南年均AOD因此增长45%,华北6-8月AOD增长33%。不同模式采用相似的硫酸盐吸湿增长曲线。相对湿度低估对AOD模拟影响程度主要受吸湿颗粒质量浓度和相对湿度概率分布影响,该结论有助于解释我国AOD模拟误差。  相似文献   

精细古地貌恢复在海上油田中-深层储层预测中的应用——以渤海X油田沙二段为例          下载免费PDF全文

邓猛  金宝强  周军良  胡勇  耿红柳 《地质找矿论丛》2018,33(3):399-408

近年来渤海X油田生产与资源的矛盾日益凸显,且因钻井少、井距大和储层埋藏深,储层认识及"甜点"预测难度很大。文章综合利用钻、测井资料、地震资料等,以高频层序地层格架下地层发育特征为切入点,采用"地震分析定性、层序格架定时、地层厚度定量、三维可视成图"的思路,重点经过去压实恢复、古水深校正,精细恢复沙二段6个沉积时期古地貌。其结果表明,渤海X油田主要发育沟谷、凹陷、斜坡和凸起四种地貌类型。不同沉积期古地貌特征差异明显:沉积早期以隆起为主,沟谷-凹陷组合仅在西南部发育,沉积范围局限;沉积中后期隆起向西北收缩,沟谷-凹陷组合向东北延伸,沉积范围扩大;沉积晚期全区大范围以沟谷-凹陷组合为特征,地形坡度变化小,砂体连片分布。此外,结合生产动态及薄片资料等,从砂岩厚度、水动力条件、单井产能等方面,以E3S2-1—E3S2-2小层古地貌分布图为基础,综合选择砂岩厚度大于15m、古水深小于7m、比采指数大于0.6等参数作为边界约束,预测出有利储层分布区域3个。上述认识对该区后期开发、调整具有重要的参考价值。  相似文献   

实物地质资料二次开发利用在矿山深边部找矿中的作用          下载免费PDF全文

高建伟  任香爱  邓会娟  李秋玲  李英康  赵国春 《地质找矿论丛》2018,33(1):156-160

随着多年的开采,我国许多矿山成为危机矿山,外围及深部的找矿工作迫在眉睫。在前人研究的基础上,笔者总结了矿山二次利用实物地质资料进行找矿预测的方法,并将其归纳为成果及原始资料的重新分析、成矿预测方法的正确选择、实物地质资料的重新利用、找矿思路的重新确定、成矿规律的重新认识5个方面内容,以期望生产矿山加强实物地质资料二次开发力度,开辟深边部找矿的新局面。  相似文献   

Downstream grain‐size changes associated with a transition from single channel to anabranching     

《Sedimentology》2018,65(5):1590-1610

Downstream variation in grain size associated with changes in river pattern is a topic that interests multiple disciplines. How grain size varies between adjacent reaches with strongly contrasting river pattern is an outstanding question. This study presents a combined field and numerical modelling investigation of a river with a downstream planform change from single channel to anabranching, where the planform is controlled by a change in underlying lithology. This approach enabled exploration of the controls on sedimentology in a river for which there is very limited opportunity to collect flow and sediment transport data. This study shows that the surficial grain size decreases as a result of the downstream change in planform. This is because of a decrease in flow velocity and shear stress associated with a decrease in channel depth related to the planform change. Channel geometries in both the field and modelling data fit into distinct groups based on channel depth, the deepest being the single channel reach and the shallowest being the anabranching. This downstream reduction in channel dimension (depth) is caused because the total discharge is split from one channel into multiple channels. The coarsest grain sizes (cobble) are deposited at the terminus of the single channel and in the distributary channels; anabranching channels contain sand‐size sediments. This study shows that, in a transition from single channel to anabranching, the channel dimensions decrease as the number of channels increases, resulting in a decrease in bed shear stress and the fining of bed material downstream.  相似文献   

存储式光纤陀螺测斜探管研制          下载免费PDF全文

周策  刘一民  罗光强  孟照魁  焦焕静  高爽 《探矿工程》2018,45(10):147-159

本文介绍的“存储式光纤陀螺测斜探管”主要解决超高温大井深环境下钻孔轨迹测量“测斜探管”问题,它包括钻孔各孔深井段倾角、方位角、工具面向角及温度的测量。目标是攻克光纤陀螺传感器温度漂移、光纤陀螺惯测组合井下环境适应性、仪器外场标定技术和误差分析校正等关键技术,研制的超高温钻孔轨迹测量仪,使用环境温度可达270 ℃,环境压力120 MPa,通过在高温地热能钻探工程、干热岩钻探工程、科学钻探工程、深部矿产资源勘探和深部油气资源勘探等工程中的应用,拓展应用领域,为超高温大深度钻井轨迹测量提供技术支撑。  相似文献   

水声定位模型的解析解及其仿真分析   总被引：1，自引：0，他引：1  

吴帅 《测绘与空间地理信息》2015,(8):87-89

主要对水下目标的定位进行了系统的研究,通过引入同步定位模型来确定水下的目标位置,并给出了平差解算模型,分析了水下同步定位过程中,不同误差对同步定位精度的影响,通过对不同误差进行模拟,得出了不同误差对水下同步定位精度的影响状况,从而对水下定位有指导作用。  相似文献   

FJCORS 与测深仪组合系统在水下地形测量中的质检探讨     

虞棠胜 《测绘与空间地理信息》2015,(8):221-224

根据连续运行卫星定位服务系统可实时获取三维坐标、测深仪可实时获取水深数据的特点,提出水下地形测量中快速获取水下地形点高程和水深的方法。 FJCORS和测深仪组合系统不但广泛应用于水下地形测量,而且还可对其成果质量进行检查和分析,确保成果数据的可靠性,保证水下地形测量成果合格。  相似文献