共查询到20条相似文献，搜索用时 62 毫秒
1.
科学钻探中的元素测井技术 总被引：10，自引：0，他引：10
系统地介绍了科学钻探中应用自然伽玛能谱测井、活化测井、热中子俘获伽玛能谱测井和中子非弹性散射伽玛能谱测井确定元素含量的原理和方法;详细讨论了在不同的岩性条件下如何选择和建立从元素含量向矿物成分转换的模型。最后,介绍了元素测井技术在ＫＴＢ和ＯＤＰ中的应用,说明元素测井技术对重建岩性剖面、了解元素丰度和矿物成分的变化、研究矿物在高温高压下蚀变所涉及的地球化学作用、显示岩石的不均匀性和重建地球化学剖面等方面有特殊作用。此外,元素测井技术对于精确计算骨架密度、孔隙度和渗透率、井与井间相关对比,以及补足由于漏掉岩芯或岩屑而失去的有关信息,均具有重要作用。 相似文献
2.
具有高纯锗深测器（ＨＰＧｅ）的测井系统能对γ辐射污染和地下的天然放射性核素进行定量评价。该系统正在美国能源部的汉福德基地使用。这里的土壤已被过去的核材料生产溢流的核素污染。用已知Ｋ，Ｕ，Ｔｈ含量的标准模型对该系统进行标定。这样产生了能量在０．１～３ＭｅＶ范围内的Ｋ，Ｕ和Ｔｈ的标定常数和反效率函数。对于人工核素来说，除知道能量和γ射线产生系数外，反效率函数可以针对这些人工γ射线源对系统进行校正，即使 相似文献
3.
测井资料用于盆地中火成岩岩性识别及岩相划分:以准噶尔盆地为例 总被引：1，自引：0，他引：1
以准噶尔盆地为例,建立火成岩的测井岩性识别和测井相划分的方法,运用火成岩岩石学理论和岩石物理学的技术方法,确立了火成岩岩性、岩相的测井分类标准。揭示了自然伽马测井、密度测井、ECS测井对火成岩化学成分的变化最为敏感,从基性到酸性火成岩的自然放射性强度逐渐增强,密度降低,金属元素含量减少,二氧化硅含量增加;火成岩的自然放射性、密度、电阻率对火成岩的结构变化有一定的反映,火山碎屑岩与同质的熔岩相比,自然放射性、密度、电阻率测井值降低;补偿中子测井值对火成岩的蚀变程度反映最为敏感,密度、电阻率对火成岩的蚀变程度有一定的反映,且随着蚀变程度的增强,密度、电阻率测井值有降低的趋势。并用岩性敏感测井曲线制作了多维火成岩岩性识别图版、用成像测井制作了火成岩的结构与构造识别图版,用ECS测井区分岩石成分,用岩心资料进行验证,提出了常规测井+成像测井+ECS测井+岩心标定的火成岩岩性识别模式和技术方法,综合判定火成岩岩石的类型、成分、结构和构造,提高了复杂火成岩岩性识别的准确率。 相似文献
4.
对相山铀矿床岩石、矿石中石英热释光的研究发现，热释光强度与其所在的岩性和其中的Ｕ、Ｔｈ、Ｋ总量有关，总的趋势是Ｕ、Ｔｈ、Ｋ总量增加，热释光强度显著降低；石英热释光辉光曲线上的峰形存在明显差异，岩石中石英热释光辉光曲线的峰形比较复杂，多数曲线呈双峰，且都是中温峰的相对强度比高温峰的相对强度低；矿石和近矿围岩中石英热释光辉光曲线都是双峰，且都是中温峰的相对强度比高温峰的相对强度高。这些差异可作为该矿床 相似文献
5.
地面伽玛能谱测量在西范坪铜矿勘查中的应用 总被引：2，自引：1，他引：1
我们在文中主要介绍了利用ＣＤ－３型微机化地面伽玛能谱测量仪在四川盐源县西范坪斑岩型铜矿中寻找有利含矿部位、区分岩性界限的应用效果。阐述了利用地面伽玛能谱测量给出的Ｕ、Ｔｈ、Ｋ含量及其比值等参数信息来解决有关地质问题的方法及手段,也为全面评价西范坪铜矿的发展前景提供了一定的依据。 相似文献
6.
中国满州里—绥芬河地学断面放射性元素与岩石圈热结构及温度分布 总被引：2，自引：0，他引：2
根据断面域兴安、松嫩地块各时代地层和花岗质岩石及所估算的地壳各结构层的Ｋ、Ｕ、Ｔｈ含量，研究了岩石的热产生率及其变化、以及岩石圈的热结构和温度分布，揭示了兴安、松嫩地块热产生率与岩性及时代的关系。兴安、松嫩地块均以高热流为特征，特别是松嫩地块为明显的高热异常区。岩石圈内的温度分布结合地球物理信息的分析表明，两地块深部地壳可能存在低速高导的部分熔融体。 相似文献
7.
8.
伽玛能谱参数与金矿找矿 总被引：1，自引：0，他引：1
γ能谱测量方法是一种简便、有效、快速的间接找金的方法,不同类型的金矿其伽玛能谱特征并不相同。与深成脉岩活动有关的脉状金矿,具有明显的伽玛能谱Ｋ／Ｕ参数异常;与中浅成中酸性侵入发杂岩体有关的金矿,具有Ｋ／Ｕ,Ｋ／Ｔｈ参数正异常;而与浅成－超玫成偏碱性杂岩体有关的隐爆角砾岩型金矿,则具有一致的Ｕ,Ｔｈ,Ｋ及Ｆ参数正异常。本介绍了在山东东部乳山地区及临沂西部地区,利用没的伽玛能谱参数进行不同类型的金矿 相似文献
9.
伽马能谱测量在侵入体岩石谱系单位填图中的应用 总被引：1，自引：0，他引：1
在１：５万区域地质填图中,可利用γ能谱测量仪在现场测定各类侵入岩的Ｕ,Ｔｈ,Ｋ含量,Ｕ／Ｔｈ,Ｋ／Ｔｈ,Ｕ／Ｋ比值和γ照射量率等参数。通过对地面γ能谱测量资料与区域地质特征的综合分析,将攀枝花地区侵入体划分为１９个单元,６个超单元及一个超单元及一个超单元组合,还确认了色腰和矮郎河花岗岩为印支期,花滩花岗岩和同德闪长岩均为太古代古陆核的组成部分。 相似文献
10.
伽玛能谱测量在鲁西地区金矿预测中的应用 总被引：1，自引：0，他引：1
鲁西地区伽玛能谱测量应用实践表明,伽玛能谱测量是一种简便、快速、有效的间接找金方法,不同类型的金矿其伽玛能谱特征不相同,具有不同的伽玛能谱参数．与中浅成中酸性侵入杂岩体有关的金矿个有Ｋ／Ｕ参数正异常;与浅成和越浅成偏碱性－碱性杂岩体有关的稳爆角砾岩型金矿则具有一致的Ｕ、Ｔｈ、Ｋ有Ｆ参数正异常。 相似文献
11.
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
12.
The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
13.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
14.
正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
15.
正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
16.
17.
正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
18.
正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
19.
正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献
20.
正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献