渤海湾盆地南堡凹陷南部深层沙一段优质碎屑岩储层特征及成因机制     

赵晓东  时阳  文雯  李亮  张博明  陈刚强 《地质论评》2021,67(3):67040015-67040015

利用岩芯、薄片、扫描电镜和分析化验等资料,对南堡凹陷南部深层古近系沙一段（沙河街组一段）优质碎屑岩储层特征进行了分析并揭示其成因机制。研究表明：①南堡凹陷南部沙一段优质碎屑岩储层属于低孔中渗储层,发育原生孔隙、次生孔隙和微裂缝;②沙一段沉积期处于强水动力沉积环境,辫状河三角洲前缘水下分流河道砂体普遍发育,岩性主要为中粗砂岩、含砾砂岩和砂砾岩等粗岩性,岩石类型主要为岩屑长石砂岩,石英、岩浆岩岩屑等刚性组分含量高,储层在强压实作用下仍保留了局部原生残余粒间孔,部分刚性组分强压条件下形成微裂缝;③沙一段与东三段为区域不整合接触,大气水的酸性流体在成岩初期以及烃源岩成熟之后产生的有机酸在成岩后期通过油源断裂和不整合面进入储层,造成长石、易溶碎屑等组分溶蚀形成次生孔隙,溶蚀作用不仅增加孔隙空间,而且扩大喉道宽度。结论认为：粗岩性和高刚性颗粒含量为原生孔隙的保存提供了物质基础;油源断层、不整合面为酸性流体的进入提供路径,促进了次生孔隙发育。  相似文献   

海洋科技在21世纪海上丝绸之路建设中的作用     

韩鹏  钱洪宝 《海洋技术学报》2015,34(3):122-124

21世纪海上丝绸之路建设在海洋经济活动、海上综合保障等方面对海洋科技领域提出了新命题。在分析我国海洋技术优势领域的基础上,围绕科技创新政策伙伴关系、培育创新品牌、推进海洋经济和产业发展等方面,深入阐述了海洋科技领域在21世纪海上丝绸之路建设中的支撑作用,同时提出具体工作思路。  相似文献   

第一次全国地理国情普查中大批量高分辨率卫星影像快速处理实践     

张海霞  李书丹  陈延博 《测绘与空间地理信息》2015,(10):133-136

对World View/Quick Bird高分辨率卫星影像快速处理实验,实现了在控制点相对较少且分布不均的情况下,对不同时相、不同轨道的遥感影像进行大批量快速处理与生产,避免了不同轨道影像之间接边差较大导致后续影像镶嵌困难情况的出现。通过生产实践,形成了大批量高分辨率遥感影像快速处理解决的方案,产品符合精度要求并有效地提高了工作效率,为第一次全国地理国情普查的顺利实施提供强有力的技术支撑和应用参考。  相似文献   

“海上丝绸之路”沿线重要港口竞争力评价   总被引：1，自引：0，他引：1  

杨忍  牟乃夏  彭澎  刘希亮  张恒才  陆锋 《地球信息科学学报》2018,20(5):623-631

“海上丝绸之路”是促进亚欧和亚非互联互通的重要通道,对其沿线重要港口的竞争力研究,可以为海上丝绸之路的建设提供参考。本文综合考虑港口的自然条件、腹地环境、基础设施、服务水平、政府廉洁度,及其在航运网络中的地位差别等因素,运用熵权-层次分析法对沿线51个国家的99个重要港口的竞争力进行评价。结果表明,① 港口综合竞争力空间分布呈明显的区域化特征,且与国家经济发展水平显著相关,地中海地区港口竞争力普遍较强,亚洲次之,非洲最弱。② 港口的网络地位对竞争力的影响最大,竞争力强的港口多位于重要水域的战略通道,网络地位高,辐射范围广。③ 我国投资的部分沿线港口综合竞争力与成熟港口之间还存在一定差距,但是具备较大的竞争力提升空间。  相似文献   

A late Early Pleistocene pollen record from Fontana Ranuccio (central Italy)     

Paolo Corrado  Donatella Magri 《第四纪科学杂志》2011,26(3):335-344

A pollen record from a sediment core drilled underneath the Acheulian site of Fontana Ranuccio provides new data on the vegetation characters in central Italy during the late Early Pleistocene, in a forest phase possibly corresponding to a substage of Marine Isotope Stage 21. A number of tree taxa nowadays extinct in Europe (Cathaya, Tsuga, Taxodium type, Carya and Pterocarya) are present at Fontana Ranuccio in a temperate phase characterised by dense forest conditions, dominated by Alnus and Pterocarya. The comparison of the Fontana Ranuccio record with other dated sites distributed along the Italian peninsula indicates that the floristic and vegetational characters of the Mid Pleistocene revolution present a rather distinct succession of biostratigraphic events. Compared to other Early Pleistocene pollen records from southern Europe, the Italian Peninsula shows greater floristic similarities with the Eastern Mediterranean regions than with the Iberian Peninsula. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

21世纪的大洋钻探——IODP   总被引：1，自引：0，他引：1  

薛发玉  翟世奎 《海洋地质与第四纪地质》2002,22(1):109-114

人类在地球科学方面已取得了相当大的成就,但就研究范围而言,却仅仅触及了地球的表层。IODP是一项国际性的大洋钻探计划,预期将于2003年10月正式开始实施。IODP将运用新的科学方法、科技设备,使人类对大洋底乃至整个地球系统得出更深、更广的认识。简单介绍了IODP的由来、组织机构、钻井技术、前期科学目标及中国的深海研究现状,提出中国参与IODP的必要性和可行性。通过了解21世纪的IODP在研究课题及研究技术方面的最新动态,不仅有助于我国根据国际动态调整深海研究的方向,制定符合我国需求的研究计划,而且有助于我国把握参与21世纪IODP的时机和策略,迎接“海洋世纪”的挑战,从而逐步实现“从地学大国走向地学强国”的目标。  相似文献   

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)     

Emily Keeble  David I. Whiteside  Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119

Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.  相似文献   

建立高海拔矿山测量控制网的思路     

王云生 《云南地质》2012,(2):249-252

受海拔高、空气稀薄、气候无常、高差较大等自然条件的影响,高海拔地区进行测量作业与低海拔地区有很大差别。根据高海拔地区矿山特点,结合多年矿山控制测量、特别是高海拔矿山控制测量经验,讨论在高海拔地区矿山因地制宜地建立测量控制网的方法。  相似文献   

新世纪俄罗斯找矿地球化学     

唐金荣  金玺  周平  朱丽丽  杨宗喜  施俊法 《地球学报》2012,33(2):145-152

在系统跟踪研究国内外地质期刊文献的基础上,梳理了新世纪找矿地球化学面临形势和存在的重大问题,全面总结了近十年来,俄罗斯有关找矿地球化学基础理论和方法论、区域地球化学调查方法与应用,以及地质-地球化学找矿模型的研制与应用等众多方面的思路和做法。研究认为,俄罗斯首创的多目标地球化学填图技术可有效地提高国家地质图的质量,为矿产资源量的综合评价和生态环境的评估及一系列基础问题的解决,提供详细的信息。同时,还指出俄罗斯地球化学家为解决新世纪的找矿问题,加大了技术创新,重点聚焦于提高地球化学找矿信号的衬度和强度,提高运用地质-地球化学找矿模型的效用,完善处理地球化学数据的计算技术,以实现地球化学场与地质、地球物理场的综合等,诸创新点和思路值得参考借鉴。  相似文献   

Development of a river delta: a case study of Cimanuk river mouth,Indonesia     

Nita Yuanita  Tawatchai Tingsanchali 《水文研究》2008,22(18):3785-3801

This paper describes delta development processes with particular reference to Cimanuk Delta in Indonesia. Cimanuk river delta, the most rapidly growing river delta in Indonesia, is located on the northern coast of Java Island. The delta is subject to ocean waves of less than 1 m height due to its position in the semi‐enclosed Java Sea in the Indonesian archipelago. The study has been carried out using a hydrodynamic model that accounts for sediment movement through the rivers and estuaries. As an advanced approach to management of river deltas, a numerical model, namely MIKE‐21, is used as a tool in the management of Cimanuk river delta. From calibration and verification of hydrodynamic model, it was found that the best value of bed roughness was 0·1 m. For the sediment‐transport model, the calibration parameters were adjusted to obtain the most satisfactory results of suspended sediment concentration and volume of deposition. By comparing the computed and observed data in the calibration, the best values of critical bed shear stress for deposition, critical bed shear stress for erosion and erosion coefficient were 0·05 N m^?2, 0·15 N m^?2, and 0·00001 kg m^?2 s^?1, respectively. The calibrated model was then used to analyse sensitivity of model parameters and to simulate delta development during the periods 1945–1963 and 1981–1997. It was found that the sensitive model parameters were bed shear stresses for deposition and erosion, while the important model inputs were river suspended sediment concentration, sediment characteristics and hydrodynamic. The model result showed reasonable agreement with the observed data. As evidenced by field data, the mathematical model proves that the Cimanuk river delta is a river‐dominated delta because of its protrusion pattern and very high sediment loads from the Cimanuk river. It was concluded that 86% of sediment load from the Cimanuk river was deposited in the Cimanuk delta. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献