Assessment of copper,cadmium and zinc remobilization in Mediterranean marine coastal sediments

The remobilization of copper, cadmium and zinc in sediments of three selected coastal microenvironments of the Aegean Sea (Eastern Mediterranean) is assessed. Various analytical methods and techniques were employed providing concentrations, profiles and forms of metals and organic matter in sediments and pore waters.     

深水表层钻井液密度与流变参数相关性研究

钻井液流变参数和密度的确定是钻井工程中一项十分重要的工作,它直接关系到钻井工作的成败。通过实验研究钻井液密度与流变参数的相关性,参照海上表层钻井液的配方,配制不同密度的钻井液测其性能,对实验数据作图,建立了密度与流变参数的数学模式。根据数学模式就可以通过钻井液的密度来初步确定钻井液的流变参数。     

多羟基糖苷防塌剂的合成及性能研究

以淀粉为主要原料,合成了新型多羟基糖苷防塌剂DTG-1。对合成样品的理化性能、页岩抑制作用、水溶液活度、生物毒性以及对泥页岩半透膜膜效率的影响规律进行了测定,考察了DTG-1在淡水、盐水和饱和盐水钻井液中对钻井液流变性能和滤失造壁性能的影响,并对DTG-1稳定井壁及改善钻井液流型的作用机理进行了分析。研究表明,用淀粉合成的多羟基糖苷,具有一定的抑制泥页岩水化膨胀、分散和提高泥页岩的膜效率的作用,能有效降低钻井液的水活度,属于无毒、环保型钻井液处理剂;DTG-1对高密度钻井液具有很好的流型改善作用,用DTG-1配制的钻井液具有组成简单、流变性易调整、高温稳定性好、抗污染性强等特点。     

Research on experiment and calculation of foam bursting device

This research presents experimental data on mechanical foam bursting device, based on the high speed of air fluid impinging insidethe foam bursting device, foam bubbles disrupted as a consequence of pressures changed very quickly as shear force and their impact forces. Experimental data on foam-bursting capacity have been presented. Designed device can provide effective foam bursting on collapse foam.     

Discovery of eclogite facies carbonate rocks from the Lindås Nappe, Caledonides, Western Norway

Eclogite facies carbonate rocks have been discovered associated with the granulite–eclogite transitional rocks within Bergen Arc system, Caledonian Orogen of western Norway. The local occurrences of marbles and calc‐silicates are found subparallel to the mafic eclogite facies shear zones on Holsnøy Island. Marbles contain the assemblage calcite (Ca_0.99Sr_0.01CO₃), calcian strontianite (Ca_0.18?0.44Sr_0.53?0.84CO₃), clinopyroxene (Jd_7?32), epidote/allanite (Ps_0?33), titanite, garnet (Alm_52?56Grs_28?33Pyp_11?16), barite (Ba_0.90?0.99Sr_0.01?0.10SO₄), celestine (Sr_0.67?0.98Ba_0.01?0.23Ca_0.01?0.11SO₄), and one apparently homogeneous grain of intermediate composition (Ba_0.49Ca_0.01Sr_0.50SO₄). Adjacent eclogites have clinopyroxene with similar jadeite contents (Jd_14?34) and similar garnet (Alm_51?60Grs_26?36Pyp_8?14) compositions. The marbles have high contents of Sr (9500–11000 p.p.m) and Y (115–130 p.p.m). However, low concentrations of some key trace elements (110–160 p.p.m. Ba and <5 p.p.m. Nb) appear to indicate that the marble is not a metamorphosed carbonatite. The ⁸⁷Sr/⁸⁶Sr ratios range from 0.7051 to 0.7059. Field and petrological relationships suggest that metasomatic reactions and fluids played a significant role in producing and/or modifying the marbles. The breakdown of scapolite in the granulite into carbonates and sulphates during eclogite facies metamorphism may have contributed to the metasomatic formation of the marbles along shear zones. Fluids involved during subduction are an important catalyst for metamorphism and are recognized to have played a critical role in the localized transformation from granulite to eclogite in the Holsnøy Island area. Thermobarometry indicates 640–690 °C and 18–20 kbar for adjacent eclogites and temperatures of 580–650 °C for the calc‐silicates. The marble assemblages are consistent with fluid that is dominantly comprised of H₂O (X_CO2 < 0.03) under high‐pressure conditions. Phase equilibria of the marbles constrain the fO₂ of the fluids and imply oxidizing conditions of the deep crustal fluids. At present the source of the fluids remains unresolved. The results provide additional insights into the variable and evolving nature of fluids related to subduction and high‐pressure metamorphism.     

Laboratory studies of the effects of interrupted, sloping topography on intermediate depth boundary currents in linearly stratified fluids

Laboratory experiments are described which provide insight into the interaction of intermediate depth boundary currents (IDBCs) with interrupted sloping topography. Specifically, they contribute to the debate over meddy formation on the Iberian continental slope. The experiments were performed in a rectilinear rotating tank filled initially with a linearly-stratified fluid. A false bottom sloped away from the side-wall along which the current flowed, and was interrupted by a gap of variable length. The effects of varying gap length and rotation rate on the boundary current were observed.In the first of two sets of experiments, the current flowed above the slope, along the vertical sidewall. In the second, the current flowed along the sloping bottom. In the former, current nose speed was consistent with geostrophic predictions, but decreased in the presence of a gap in the topography. Kelvin wave radiation is postulated as a reason for this. The IDBCs exhibited vortical lateral intrusions at values of the Burger number Bu=(N₀/Ω)² at which counterpart flat-bottom studies had been stable, implying that the sloping topography had a de-stabilising effect. Energy measurements and qualitative observations suggest the intrusions were due to mixed barotropic/baroclinic instabilities, the latter dominating at higher rotation rates.In the second configuration, four distinct flows were observed, distinguished by the deformation radius:gap width ratio R_D/G^*. For a range of values of R_D/G^*, attached eddies formed at the upstream end of the gap. They remained at this position, unlike those in similar studies of surface boundary currents (Klinger, 1993). Their persistence and ability to move downstream – salient factors for meddy – formation were greater for a finite gap size than a permanent change from sloping to flat bottom.     

查干凹陷早白垩世碎屑岩储层成岩作用及孔隙演化

在对大量薄片和岩心观察分析基础上,结合扫描电镜和全岩分析、 X衍射粘土分析、 包裹体测温等手段,对查干凹陷碎屑岩储层的成岩作用和孔隙演化进行了研究。结果表明: 研究区碎屑岩储层主要为低成分成熟度、 低结构成熟度的长石岩屑砂岩,成岩作用呈现“强压实、 强胶结、 弱交代、 弱溶蚀“的“两强两弱”特征;成岩阶段主要处于中成岩A期,局部达中成岩B期至晚成岩期。两期胶结主要发生在苏二早期和乌兰苏海时期,中浅层（<2 500 m）较低孔隙度主要由于强压实和早期致密胶结所致;较高孔隙度是由于原生孔隙保存较好,长石及碳酸盐胶结物的溶蚀作用导致孔隙度增大。深层碎屑岩储层（>2 500 m）较低孔隙度除压实作用外,碳酸盐致密胶结是主因;较高孔隙度则为早期酸性溶蚀叠加晚期碱性溶蚀产生次生孔隙为主。晚期碱性溶蚀发生在油气充注之后,为无效溶孔。     

砂砾土动力特性的室内试验研究进展

简要回顾了国内外有关砂砾土动剪切模量和阻尼比的试验研究进展,总结了围压、固结比、颗粒形状、含砾量、颗粒破碎等因素对砂砾土动剪切模量、阻尼比及归一化动剪切模量比与阻尼比曲线特征的影响规律,发现砂砾土归一化动剪切模量比和阻尼比的曲线形状主要受围压大小的影响,其他因素的影响不明显;总结了砂砾土抗液化强度、振动孔压发展特征、液化判别方法方面的研究进展,含砾量、试样扰动、膜贯效应是影响砂砾土抗液化强度的主要因素;指出了砂砾土动力特性研究中存在的问题及今后应予以更深入关注的研究方向。     

气体（CH4、H2S、CO2）在水溶液中的溶解度模型

本文介绍一个通过状态方程和特定粒子相互作用理论建立起来的气体在水溶液中的溶解度模型,用以计算气体(CH4、H2S、CO2)在纯水和含盐水溶液中的溶解度、流体包裹体的均一条件、成矿热液沸腾、流体不混溶性、水合物形成条件、CO2地质储藏量等.该模型不仅重现了上百套实验数据(约8000多个数据点),而且具有很强的外延能力.因...     

CLYJ饱水石灰岩骨架和流体弹性参数估算

文章结合CLYJ饱水石灰岩数据案例,开展以反演为主的数值计算分析研究.运用样品测试的整体密度和纵横波速度数据,采用合理有效的反演方法,求取骨架和流体组分弹性参数的估计数据.在完成样品数据准备和模型方程选定后,进行组分弹性参数估计.方法包含样品分组、回归分析、统计分析和结果对比评估.首先是样品分组,分组方式可分为整体和个...