新疆罗布泊K1孔岩心中有孔虫化石的发现及其意义

笔者在新疆罗布泊Ｋ１孔第四纪沉积物中,首次发现丰富的有孔虫化石（Ａｍｍｏｎｉａ）及与其伴生的介形虫和轮藻化石。Ａｍｍｏｎｉａ是中新世至观在世界上常见属种,属海陆过渡相种群,第四纪罗布泊已距海遥远,不可能发生海侵,根据塔里木盆地新生代浸侵史,认为罗布泊Ｋ１孔第四纪沉积物中有有孔虫来源于残留海。     

海相低勘探程度地区油气资源评价:以柴达木盆地德令哈坳陷石炭系为例

海相低勘探程度地区油气资源评价的难点是资料少、地质认识程度低、主要参数获取难度大,影响评价结果可信性.以柴达木盆地德令哈坳陷石炭系为例,系统评价德令哈坳陷石炭系生储盖条件,油气资源评价选用盆地模拟法与类比法相结合方法,关键参数的确定采用了地球物理、地球化学与石油地质学等多种方法,利用油气运移聚集模拟和不同运聚单元资源量...     

山东荣成钻孔倾斜观测异常变化调查

荣成地震台钻孔倾斜NS分量2017年5月2日出现趋势下降（南倾）异常变化,至15日持续下降累计幅度达358×10^-3",对观测系统工作状态、观测环境干扰、气象因素及地下水位等进行调查,通过滑动相关性分析和三维点源载荷模拟等方法,结合胶东半岛近期地震活动,分析认为,该异常非干扰造成,可能反映了区域地壳应力的变化,需予以关注。     

Genesis of Polyhalite in the Halite in Jialingjiang Formation of Triassic,Eastern Sichuan Basin,China

正Polyhalite generally formed in the early diagenetic stage.It is formed by the brine which rich in K+and Mg2+and adverse reaction with the gypsum,anhydrite,glauberite(Pierre,1985;Peryt et al.,2005;Leitner et al.,     

北极巴伦支海海冰多年变化特征研究

本文采用2003～2016年SSMI海冰密集度和NCEP气温、风场等数据,通过计算海冰覆盖率、增长期长度、冬季负积温和风拖曳力等参数,分析了巴伦支海海冰的变化特征及其与热力、动力影响因素之间的联系。结果显示,因西南部存在常年无冰区,巴伦支海14a平均的海冰覆盖率低于50%;覆盖率总体呈现下降趋势,冰情呈现"重—中等—轻"的变化过程,2012年后甚至出现夏季无冰的情况;增长期长度先增后减,起止时刻均有推迟;冬季负积温是影响巴伦支海冰情轻重的重要因素,与年平均海冰覆盖率距平和最大覆盖率的相关系数分别为-0.90和-0.89;风拖曳力的改变可在短期内引起海冰覆盖率急剧变化,是海冰边缘区产生流冰的主要原因,易对油气资源开发的海洋平台产生危害。     

基于SBAS-InSAR技术的安徽省砀山县地面沉降监测

皖北地区地貌形态以平原为主,地面沉降是其面临的主要地质灾害。基于小基线集(small baseline subsets-interferometric synthetic aperture radar, SBAS-InSAR)方法,利用2017年5月至2021年12月期间采集的47景Sentinel-1A SLC (single look complex,SLC) 升轨数据对砀山县进行地表形变监测,获得了砀山地区该时段年均形变速率和地表累计形变图,揭示了监测期间该区的形变时空分布和变化特征。结果表明: 以砀城镇为中心,包含高铁新区及经济开发区一带地表沉降明显,黄河故道以北,沿玄庙镇东西方向发生微量沉降,沉降的分布与地下水过量开采以及岩土性质密切相关。定期监测地面沉降的分布和量级,能够缓解日益增长的城市化人口暴露于这类灾害下的风险。     

云南兰坪盆地云龙组上段稀土、微量元素地球化学特征及其环境意义

沉积岩的地球化学特征蕴含了大量的地质信息,对于沉积环境的重塑及物源研究具有重要意义。云南兰坪盆地云龙组上段由一层碳酸盐岩及其上覆的碎屑岩组成。通过对碳酸盐岩和碎屑岩的主、微量及稀土元素含量等地球化学特征的研究表明:碳酸盐岩和碎屑岩∑REE总量分别为142.65×10-6~186.85×10-6和217.2×10-6~483.7×10-6,均值分别为167.44×10-6和358.7×10-6,(La/Yb)N值分别介于8.22~10.96和9.07~15.01之间,标准化曲线右倾,表明轻稀土相对重稀土富集。负Eu异常程度中等,3个泥岩样品负Ce异常强烈,其他样品无明显负异常。利用对氧化还原环境最敏感的Ce/Ce*判断,云龙组上段沉积时期主要为氧化环境,碳酸盐岩沉积时期呈弱氧化性,部分层位为还原环境,氧化性:泥岩粉砂岩碳酸盐岩。Sr/Ba比值0.75,表明当时为淡水沉积。根据∑REE和(La/Yb)n,结合Fe2O3/MnO、EFMn、CaCO3(%)和Al(%)等其他特征值判断,碎屑岩沉积时期以温暖湿润为主、碳酸盐岩沉积时期以干旱炎热为主的古气候条件,并且存在干湿交替的气候变化。沉积物源来自于上地壳,原始物质主要为长英质岩石,还有部分的中基性岩。     

Controlling Factors of Physical Property of Tight Sandstone Reservoir of Fuyu Oil Layer in Daan Oilfield

<正>Daan oil field is located in the secondary belt of DaanHonggang terrace of the central depression area in the south of Songliao basin,and the study area is located on the deepest sub sag in Daan-Honggang terrace.Fuyu oil layer is the main layer series of development of the oilfield.The main controlling factors of the physical     

The Central Submarine Canyon in the Qiongdongnan Basin, northwestern South China Sea: Architecture, sequence stratigraphy, and depositional processes

Submarine canyons have been the subject of intense studies in recent years because of their close link to deepwater systems. The Central Canyon is a large unusual submarine canyon in the northwestern margin of the South China Sea, has a total length of about 425 km and is oriented sub-parallel to the continental slope. Using integrated 2D/3D seismic, well log, core, and biostratigraphy data, the current study documents the stratigraphic framework, internal architecture, depositional processes, and controlling factors of the segment of the Central Canyon located in the Qiongdongnan Basin.The integrated analysis shows that the canyon fill consists of four 3^rd-order sequences, SQ4, SQ3, SQ2, and SQ1. Each of them is bounded by regionally important erosional surfaces (3^rd-order sequence boundaries). Within each 3^rd-order sequence there is maximum regressive surface separating a regressive systems tract in the lower part and a transgressive systems tract in the upper part. Nine facies are identified and are further grouped into five depositional units, DU1 through DU5.The canyon evolved through four cut-and-fill stages, with a change from predominantly axial cut-and-fill to primarily side cut-and-fill. Axial cut-and-fill dominated during the first stage, and the slope-subparallel paleo Xisha Trough was intensely eroded by large-scale axial gravity flows. During the second cut-and-fill stage, the Central Canyon experienced both axial and side cut-and-fill. The third stage was dominated by side cut-and-fill. The canyon was eroded and fed by slope channels that transported sandy sediments from the shelf to the north during regression, and was covered by side-derived muddy MTCs during transgression. The last stage was also dominated by side cut-and-fill. The canyon, however, was filled predominantly by side-derived muddy MTCs.Evolution and depositional processes in the Central Canyon were likely controlled by slope-subparallel negative-relief induced by paleo-seafloor morphology, structural inversion of the Red River Fault and the slope-subparallel basement faults. Additionally, Coriolis force, sea-level fluctuations, high sedimentation rate, and rapid progradation of the slope also controlled and influenced the depositional processes, and internal architectures of the canyon.     

空间外部性、空间依赖与空间外溢之辨析

空间外部性、空间依赖和空间外溢是用来解释区域经济增长空间效应作用机制的3个重要概念,也是用来分析区域经济增长的空间效应时的3个重要分析工具。目前,对于这3个概念应该如何定位还存在着一定的争论,在使用范围以及适用情况上缺乏统一性。根据相关文献对这3个概念的内涵进行比较,总结了它们的计量测度方法,试图对以往的研究内容做出梳理并补充,进而为研究它们对区域经济增长的作用机制打下基础。