高温高压下石英砂岩的电导率实验研究     

李佳  代立东  李和平  胡海英  惠科石  蒋建军  孙文清 《矿物学报》2015,35(2):154-158

利用交流阻抗谱实验技术,在0.5~2.0 GPa、573~873 K和10-1~106 Hz条件下,借助YJ-3000t紧装式六面顶高压设备和Solartron-1260阻抗/增益-相位分析仪测定了石英砂岩的电导率。实验结果表明:在测定的频率范围,样品的复阻抗的实部、虚部、模和相角对频率有很强的依赖性。随着温度升高,电导率增大,lgσT与1/T之间符合Arrhenius线性关系。通过拟合计算,获得了表征样品电学性质的指前因子、活化焓、活化能、活化体积等物性参数。杂质离子导电机制对高温高压下石英砂岩的导电行为提供了合理的解释。  相似文献   

The Synthetic Evaluating Method of Shale Oil sweet spot in the Jiyang Depression     

HU Yang 《《地质学报》英文版》2015,89(Z1):342-345

<正>1 Introduction During the processes of shale oil-exploration in the Jiyang depression,more than 700 exploratory wells going through the mudstone layers appeared oilgas shows,while only 40 of them had commercial hydrocarbon flows in the end.Meanwhile,increasing oil-gas production of  相似文献   

Cenozoic Tectonic Evolution of the Arcuate Structures in the Northeast Tibetan Plateau     

SHI Wei  HU Jianmin  CHEN Hong  LIU Yuan  CHEN Peng 《《地质学报》英文版》2015,89(2):676-677

<正>The northeast Tibetan plateau contains important information on the northeastward growth of the Tibetan plateau.It is bounded by the Ordos Block to the east,the Alxa Block to the north,and the Tibetan Plateau to thesouth(inset in Fig.1;Tapponnier et al.,2001),and has undergone complex intracontinental deformation during the Cenozoic.In this region,the northeast-convex arcuate structures developed northeastward,and are composed of  相似文献   

Improved Geometric Model of Extensional Fault–bend Folding     

ZHENG Xiaoli  HE Guangyu  HU Senqing  YAO Zewei  WANG Hui  LIN Lu 《《地质学报》英文版》2015,89(6):1847-1857

Extensional fault–bend folds, also called rollovers, are one of the most common structures in extensional settings. Numerous studies have shown that oblique simple shear is the most appropriate mechanism for quantitative modeling of geometric relations between normal faults and the strata in their hanging walls. However, the oblique simple shear has a rather serious issue derived from the shear direction, particularly above convex bends. We use geometric and experimental methods to study the deformation of extensional fault–bend folds on convex bends. The results indicate that whether the fault bends are concave or convex, the shear direction of the hanging wall dips toward the main fault. On this basis, we improve the previous geometric model by changing the shear direction above the convex bends. To illustrate basin history, our model highlights the importance of the outer limit of folding instead of the growth axial. Moreover, we propose a new expression for the expansion index that is applicable to the condition of no deposition on the footwall. This model is validated by modeling a natural structure of the East China Sea Basin.  相似文献   

Formation and Evolution of a Paleosol across the Lower Silurian-Lower Permian Boundary in Zunyi District, Northern Guizhou, China and Its Paleoenvironment and Paleoclimate Implications     

XIONG Xiaohui  XIAO Jiafei  HU Ruizhong  WANG Jian  WANG Yi  WANG Xinsong  DENG Qi 《《地质学报》英文版》2015,89(6):2012-2029

This paper presents a set of bulk geochemical and mineralogical data from a paleoweathering profile located in Zunyi District, Northern Guizhou, China. It was formed at the top of the Hanjiadian Formation of the Lower Silurian. A truncated, argillic, gleyed, kryptic paleospodosol is recognized in the paleoweathering profile. Ratios of immobile elements (Ti/Zr, Ti/Al) and their binary (e.g., Nb vs. Zr/TiO2 and Th/Sc vs. Zr/Sc), triangular diagrams (La-Th-Sc, Th-Sc-Zr/10, Zr-Cr-Ga) reflect that the Gaojiayan paleosol is the product of in-situ weathering of gray-green silty mudstone of the underlying Hanjiadian Formation. Mass balance calculations indicate K enrichment and Na enrichment in the upper and lower portions of paleosol, respectively. These findings both are the results of transgression, which brings substantial concentrations of such elements as K, Na, and Sr. In particular, K enrichment is achieved by the illitization of kaolinite. The biological processes of terrestrial vascular plants also enhance K concentration, especially at the top of the paleosol. Na enrichment is a consequence of albitization and/or adsorption by clay minerals through cation exchange. The mass distributions and relative mass changes of rare earth elements (REEs) in the studied profile display characteristics of vertical zonation. Three peaks in total REEs content are observed, indicating two paleoclimatic or paleoenvironmental changes. Mineralogical characteristics indicate that the paleoclimate changed first from warm and humid to cold and dry and later, to dry and lightly warmer. The corresponding soil environment varies from weakly acidic to strongly alkaline and later, to weakly acidic. Mass translocation characteristics of REEs and several transition metals suggest that the Gaojiayan paleosol may have undergone top erosion.  相似文献   

The Oil-Bearing Pore Size Distribution of Lacustrine Shale from E2S42 Sub-Member in Damintun Sag, Liaohe Depression, Bohai Bay Basin, China     

CHEN Guohui  LU Shuangfang  LI Jinbu  WANG Weiming  TIAN Shansi  SHAN Junfeng  HU Yingjie  MAO Jinli  HAN Xia 《《地质学报》英文版》2015,89(Z1):8-10

<正>1 Introduction There is a set of organic rich shale at E22S4sub-member in damnintun sag.The organic material is typically type I.In recent years,breakthrough was obtained in shale oil exploration.The wettability of organic and inorganic pore is different.As a result,the mobility of oil in organic and inorganic pore is different.So it’s necessary to distinguish  相似文献   

甘肃成县庙沟—大沙湾铅锌矿区成矿地质特征及找矿方向          下载免费PDF全文

沈利霞  胡建勇  张瑞华  张连营  金文强  李宗谨 《地质找矿论丛》2015,30(1):92-97

甘肃成县庙沟—大沙湾铅锌矿区位于西秦岭多金属成矿带西段的西成铅锌矿田内,矿区的铅锌矿化受安家岔组条带状大理岩化灰岩和条带状大理岩的控制,喷流沉积(成岩)作用是成矿的主要因素,为喷流沉积的SEDEX型矿床,同生沉积特征明显,具热水沉积特征,发育有硫化物岩、重晶石岩、硅质岩等。预测靶区为马蹄沟一带近EW向岩相突变带。  相似文献   

均质土岸坡崩塌与河床冲淤交互过程试验          下载免费PDF全文

李国敏  余明辉  陈曦  胡呈维 《水科学进展》2015,26(1):66-73

在弯道水槽中展开系列试验,研究水力冲刷过程中均质土岸坡冲刷崩塌输移与河床冲淤过程及其影响因素。该过程及变化特征可描述为:水下坡面侵蚀及坡脚淘刷导致岸坡失稳崩塌;暂时堆积在凹岸坡脚处的崩塌体加剧附近水流紊动程度利于其输运与分解;分解后较粗的颗粒随弯道螺旋流以推移质形式被输移至下游凸岸落淤,较细的颗粒大部分都随水流以悬移质形式被携带至下游出口;水流结构随岸坡及河床变形而调整;如此循环往复。试验成果进一步表明:冲刷状态下,试验材料黏性越小、近岸流速越大、作用时间越长,岸坡冲刷崩塌量及河床冲刷量都越大;同条件下岸坡冲刷崩塌总量大于河床冲刷总量,且河床相对冲刷率随岸坡冲刷崩塌量的增大而减小,数值范围为0.40~0.92。  相似文献   

基于GIS的多元信息成矿预测研究在湖南锰矿预测中的应用     

胡桥  陈建平  向杰 《江苏地质》2015,39(3):462-467

应用GIS技术并结合地质、地球物理、地球化学、遥感等资料进行综合信息成矿预测是目前找矿的一个重要趋势。以湖南省锰矿资源成矿预测研究为例,在总结区域成矿规律的基础上,以地质异常致矿理论为指导,利用GIS平台提取地质、地球物理、地球化学等多元地质找矿信息,采用证据权模型进行多元找矿信息的综合,对湖南省的有利成矿区进行锰矿预测  相似文献   

西非 Ｒio Muni 盆地复杂盐拱构造油藏特征     

马金苹  胡孝林  郝立华  曹向阳  孙翠娟  张彪 《世界地质》2015,34(3):760-765

为精细解剖西非油气富集的 Ｒio Muni 盆地复杂盐拱构造带上的油藏特征,为其他相似地区油藏评价提供一定参考,以位于复杂盐拱构造带上的 H 油藏为例,利用地震、测井、录井、钻井和 MDT 测试等资料分析 H 油藏的构造、沉积、储层和油层分布特征及成藏主控因素等。研究得出,H 油藏属于典型的构造岩性复合油藏,为构造背景下的岩性边水油藏,具有多套油水系统,构造高部位发育盐刺穿,储层既有浊积砂岩储层又有滑脱灰岩储层,主要分布于构造的翼部低部位,滑脱断层和盐拱是油气成藏的主控因素。  相似文献