沉积物粘土混浊水电导率与pH值相关性研究——以渤海湾西岸平原XZ、MD钻孔为例     

刘翀  方晶  王福  齐乌云  黎伟麒  刘志鹏 《第四纪研究》2015,35(2)

对渤海湾西岸平原XZ、MD钻孔样品的粘土混浊水电导率(以下简称EC)和pH测定值进行相关分析,结果显示EC与pH都呈高度负相关,两孔的相关系数分别为-0.830(P＜0.01)和-0.765(P＜0.01).整体上EC与pH呈反比特征.进一步根据EC测定值将两钻孔沉积物分为海相、海陆过渡相和陆相分带,并对各分带中的EC和pH作相关性分析,结果表明除XZ孔海相沉积带(Ⅰ带)相关性偏低(r=0.089,P＞ 0.05)外,其他各沉积带均显示较明显的负相关.但负相关性也有所不同,XZ孔海陆过渡相沉积带(Ⅱ带,r=-0.740,P＜0.01)负相关性最为明显;MD孔海陆过渡相沉积带(Ⅰ带,r=-0.434,P＜0.01)、XZ孔陆相沉积带(Ⅲ带,r=-0.403,P＜0.05)和MD孔陆相沉积带(Ⅱ带,r=-0.482,P＜0.05)也有较明显的负相关性.这表明沉积物EC与pH相关程度的差异,亦可在一定程度上反映出其沉积环境的不同.  相似文献   

渤海西南岸全新世最大海侵界线及其地貌特征     

刘艳霞  黄海军  董慧君  祁雅莉  张翼 《第四纪研究》2015,35(2)

结合钻孔与探地雷达探测古海相层尖灭点的测量方法与图像处理原则,本研究在沿渤海西南岸分布的8个相关钻孔附近开展了探测,经图像处理、与钻孔对比分析以及在特征位置钻探浅钻的方式,获得了5处最大海侵尖灭点的位置、地层剖面形态以及高程等信息.结合6ka B.P.、2ka B.P.左右和现代黄河流路变迁史及沿岸贝壳堤分布情况,揭示了最大海侵时期小清河向北至漳卫新河范围主要为古黄河形成的广阔三角洲潮滩地貌,海侵线远离海岸线深入内陆,其上的贝壳堤形成主要与黄河流路变迁相关;而渤海湾西南岸黄骅、沧州附近及以北主要为沼泽-潟湖-沙坝海岸地貌特征,海侵线由潟湖的陆侧边缘向海逐渐推进,沿岸分布的6ka B.P.左右贝壳堤的形成则是基于沿岸堤,并伴随风暴作用发育而来.莱州湾南岸依据埋藏古河道古湖泊的分布情况,推断该区全新世最大海侵前后具有与现代相似的海岸地貌特征,海侵时,海水直抵当时最大高潮线附近,使得海岸线与海侵线几乎相当.依据剖面地形校正结果可知,最大海侵时,海水侵入内陆至现代地表高程5.8～ 10.3m范围,后期新构造运动造成的隆起与下沉的区域差异,使得不同区域海侵层高程发生相应的变化,该结果为进一步估算海平面变化提供重要基础.  相似文献   

中国东西部典型盆地中—新生代热体制对比   总被引：4，自引：0，他引：4  

邱楠生  左银辉  常健  许威  朱传庆 《地学前缘》2015,22(1):157-168

沉积盆地的热体制和热历史是盆地动力学和油气成藏研究的重要内容,中国东西部盆地受不同构造背景和动力学机制影响,热体制存在明显差异。文中从盆地的热历史、热岩石圈厚度和岩石圈热结构3个方面对渤海湾和塔里木这两个中国东西部典型盆地中—新生代的热体制进行了分析,表明东西部盆地在中—新生代时期的热体制存在较大差异。中—新生代时期渤海湾盆地经历了早白垩世—晚白垩世早期(K1—K12)和始新世—渐新世(E2—E3)两期热流高峰,而塔里木盆地热流值是逐渐降低的过程;渤海湾盆地的热岩石圈厚度在中—新生代经历了早白垩世晚期和古近纪中—晚期两次快速的减薄高峰,减薄高峰时期岩石圈厚度仅为43~55km;而塔里木盆地则经历了中生代缓慢增厚—古近纪以来快速增厚的过程。由地幔热流与地表热流比值确定的岩石圈热结构揭示出渤海湾盆地经历了三叠—侏罗纪的"冷幔热壳"型和白垩纪以后的"热幔冷壳"型;塔里木盆地则由"热幔冷壳"型在新近纪末期转变为"冷幔热壳"岩石圈热结构。深部岩石圈的热结构和热状态的这种差异与岩石圈热-流变结构和岩石圈变形特征密切相关,通过对沉积盆地中—新生代时期的热历史和岩石圈热结构演化的研究,可以揭示沉积盆地深部的热状态,为中—新生代以来的成盆动力学机制研究提供有科学意义的参考。  相似文献   

沧东—南皮凹陷孔一上亚段原型盆地边界恢复          下载免费PDF全文

梁园  刘子藏  王湘君 《江苏地质》2013,37(1):17-23

基于盆地结构分析,井-震结合确定沧东—南皮凹陷孔一上亚段残留盆地边界。应用边缘相法和平衡剖面法对孔一上亚段原型盆地边界进行了恢复。综合分析恢复结果表明,沧东—南皮凹陷孔一上亚段地层沉积时期受沧东、徐西断层控制,遭受强烈改造,为后期构造改造的盆地,盆地剥蚀面积大于500km2,剥蚀率高于20%,且原型盆地与残留盆地的边界亦有较大差异。  相似文献   

An Analysis and Modeling Study of a Sea Fog Event over the Yellow and Bohai Seas   总被引：7，自引：2，他引：5  

Fu Gang  Guo Jingtian  Angeline Pendergrass  Li Pengyuan 《中国海洋大学学报(英文版)》2008,7(1):27-34

In this study, a sea fog event which occurred on 27 March 2005 over the Yellow and Bohai Seas was investigated observationally and numerically. Almost all available observational data were used, including satellite imagery of Geostationary Operational Environmental Satellite (GOES)-9, three data sets from station observations at Dandong, Dalian and Qingdao, objectively reanalyzed data of final run analysis (FNL) issued by the National Center for Environmental Prediction (NCEP) and Regional Atmospheric Modeling System (RAMS) results. Synoptic conditions and fog characteristics were analyzed. The fog formed when warm,moist air was advected northwards over the cool water of the Yellow and Bohai Seas, and dissipated when a cold front brought northerly winds and cool, dry air. In order to better understand the fog formation mechanism, a high-resolution RAMS modeling with a 6km×6km grid, initialized and validated by FNL data, was designed. A 48h modeling that started from 12 UTC 26 March 2005reproduced the main characteristics of this sea fog event. The simulated lower visibility area agreed reasonably well with the sea fog region identified from the satellite imagery. Advection cooling effect seemed to play a significant role in the fog formation.  相似文献   

Characteristics of helium isotopes in natural gas and its tectonic implication in Bohai Bay Basin     

丁巍伟戴金星  杨树锋陈汉林 《中国海洋湖沼学报》2006,24(3):250-254

1 INTRODUCTION Helium is a trace element in natural gas and the lightest element of all rare gases. It is formed during natural nuclear processes and it is chemi- cally stable. Because of its strong diffusibility and permeability, it is used as a very sen…  相似文献   

渤海冬季风生环流的年际变化特征及机制分析   总被引：2，自引：1，他引：1       下载免费PDF全文

马伟伟  万修全  万凯 《海洋与湖沼》2016,47(2):295-302

为探究渤海冬季风生环流的年际变化及机制,在近35年NCEP CFSR大气强迫下,利用ROMS海洋模式对渤海冬季流场进行了高分辨率的数值模拟。模式结果基本重现了已知的渤海冬季风生环流的主要特征。渤海冬季深度平均流场的EOF结果显示:首先,第一模态中风向的改变引起了一个环绕整个渤海的环流结构变化;其次,第二模态反映了渤海冬季环流存在的线性增强趋势与风场增强有关,尤其在1995年之后。从模式结果中发现,风场对渤海冬季流场存在的年际变化起到重要作用,风向的偏转对环流年际特征的影响强于风速变化。  相似文献   

渤海中部沉积物铅来源的同位素示踪   总被引：1，自引：1，他引：0       下载免费PDF全文

刘明  范德江  郑世雯  田元  张爱滨 《海洋学报》2016,38(2):36-47

本研究对渤海中部表层和柱状沉积物中Pb的含量和同位素进行了分析,研究了其时空分布规律,并探讨了其物质来源。结果表明,表层沉积物中Pb的含量为14.54×10-6~59.42×10-6,其含量在渤海湾近岸、黄河口附近、研究区的东北部较高,而在研究区的中部和渤海湾北部含量较低;Pb同位素207Pb/206Pb的值为0.8341~0.8489,208Pb/206Pb的值为2.0828~2.0980。岩心沉积物中Pb含量、同位素组成与表层沉积物相似,整体上较为稳定,但在1990s以来呈现增大的趋势。渤海中部沉积物中Pb以自然来源为主,黄河沉积物是其主要物质来源,但渤海湾北端则与滦河源物质或沿岸侵蚀相关;人类活动影响主要出现在1990s以后,与中国含Pb矿石的燃烧等工业活动相关,但影响微弱,仅在黄河口西北近岸海域、渤海湾等个别站位得到体现。  相似文献   

Sequence stratigraphy and importance of syndepositional structural slope-break for architecture of Paleogene syn-rift lacustrine strata,Bohai Bay Basin,E. China     

《Marine and Petroleum Geology》2016

Sequence stratigraphy and syndepositional structural slope-break zones define the architecture of the Paleogene syn-rift, lacustrine succession in eastern China's Bohai Bay Basin. Jiyang, Huanghua and Liaohe subbasins are of particular interest and were our primary research objectives. Interpretation of 3D seismic data, well logs and cores reveals: One first-order sequence, 4 second-order sequences, and ten to thirteen third-order sequences were identified on the basis of the tectonic evolution, lithologic assemblage and unconformities in the subbasins of Bohai Bay Basin. Three types of syndepositional paleo-structure styles are recognized in this basin. They are identified as fault controlled, slope-break zone; flexure controlled, slope-break zone; and gentle slope.The three active structural styles affect the sequence stratigraphy. Distinct third-order sequences, within second-order sequences, have variable systems tract architecture due to structuring effects during tectonic episodes. Second-order sequences 1 and 2 were formed during rifting episodes 1 and 2. The development of the third-order sequences within these 2 second-order sequences was controlled by the active NW and NE oriented fault controlled, slope-break zones. Second-order sequence 3 formed during rifting episode 3, the most intense extensional faulting of the basin. Two types of distinctive lacustrine depositional sequence were formed during rifting episode 3: one was developed in an active fault controlled, slope-break zone, the other in an active flexure controlled, slope-break zone. Second-order sequence 4 was formed during the fourth episode of rifting. Syndepositional, fault- and flexure-controlled slope-break zones developed in the subsidence center (shore to offshore areas) of the basin and controlled the architecture of third-order sequences in a way similar to that in second-order sequence 3. Sequences in the gentle slope and syndepositional, flexure controlled slope-break zones were developed in subaerial region.Distribution of lowstand sandbodies was controlled primarily by active structuring on the slope-break zones, and these sandbodies were deposited downdip of the slope-break zones. Sand bodies within lowstand systems tracts have good reservoir quality, and are usually sealed by the shale sediments of the subsequent transgressive systems tract. They are favorable plays for stratigraphic trap exploration.  相似文献   

Logging identification and characteristic analysis of marine–continental transitional organic-rich shale in the Carboniferous-Permian strata,Bohai Bay Basin     

《Marine and Petroleum Geology》2016

Currently, global shale gas exploration and exploitation are focused on marine shale. Recently, major shale gas-oil breakthroughs have been made within continental and marine–continental transitional shale in China. This study will show how transitional shale is of great importance. Based on geological field surveys, core observations, thin section analysis, organic geochemistry and X-ray diffraction, we systematically studied the basic geological characteristics (including lithology, mineral composition, and organic geochemistry) of this transitional shale. By comparative analysis of well logging data from 260 wells in the Taiyuan–Shanxi shale, we will show that these methods are effective for identifying organic-rich shale from conventional well logs and determining its thickness distribution in the Carboniferous–Permian strata of the Taiyuan–Shanxi transitional coal-bearing formation.The results indicate that the Taiyuan–Shanxi shale has a high TOC (most 2%–4%) and that the lithology is primarily carbonaceous shale with type Ⅱ₂-Ⅲ kerogens. The high thermal maturation (Ro ≥ 1.1%) favors the generation of gas. The mineral components primarily include clay minerals, quartz, and plagioclase with a moderate brittle mineral content (47 wt.%) and high clay mineral content (51 wt.%) dominated by kaolinite (43%) and mixed-layer illite-smectite (31%). The transitional organic-rich shale on conventional log curves is generally characterized by higher gamma ray (GR), neutron porosity (CNL), acoustic travel time (AC), resistivity (R_t), potassium (K), and uranium (U) readings and a lower density (DEN), photoelectric absorption index (PE) and thorium-uranium ratio (TH/U). After analyzing the log response characteristics of the organic-rich shale, the most sensitive logging curves (such as CNL, AC, DEN, PE and U) were optimized to conduct logging overlays and to construct cross-plots to qualitatively identify organic-rich shale. The identified organic-rich shale amalgamates in the middle-upper member of the Taiyuan Formation and the lower member of the Shanxi Formation consistent with the results of the TOC analysis and practical gas logging. Based on the qualitative evaluation methods of the modified △LogR and a multivariate linear regression model, we calculated the TOC of shale wells in the Taiyuan–Shanxi formation. From this we calculated the characteristic values of organic-rich shale thickness. The results indicate that organic-rich shale in the Taiyuan formation is thicker than that in the Shanxi formation. Additionally, the thickness of organic-rich shale within lagoons and deep reed swamp facies are much thicker (25–35 m and 40–80 m) than other structural profile types, whereas their lateral distribution is less than that of marine shale. The relatively small continuous thickness of the single shale layer and high clay content may have negative effects for developing the shale gas potential.  相似文献