大村矿段钻孔下偏心楔补采煤心施工技术

在煤田钻探施工中,经常会出现打薄打丢煤层现象,影响采样化验和对井田的评价。为了准确了解煤层的深度、厚度和采取完整的煤样,保证勘探质量,必须补打斜孔采取煤心,以满足地质设计和煤田勘探钻孔工程煤层质量标准的要求。在川南煤田古叙矿区大村矿段的钻探施工中,采用金刚石绳索取心钻进工艺,摸索并掌握了下偏心楔补采煤心的施工技术。     

潜孔锤钻进在地质勘查中的应用

潜孔锤钻进是以压缩空气代替传统的泥浆作为循环介质,解决了煤田火区勘察钻孔中高温水爆、烧变岩疏松裂隙发育、不稳定易坍塌的问题、突破了坚硬岩层硬钻探效率低的难题。分析了煤田火区与工程勘察的工程特点,给出了用潜孔锤钻进的钻井参数,对钻探工艺和效益进行了评价,同时对煤田火区潜孔锤钻探和常规的泥浆或清水钻探的时效与费用进行了对比。从对比结果来看,潜孔锤钻探具有设备简便,油料消耗少,用人少,时效高,经济效益明显的优点．特别适用于西北中高山缺水地区勘查钻孔的施工,具有一定的推广价值。     

黑山煤田绳索取心钻进用泥浆的配制与维护管理

长期以来,绳钻工艺因与煤系地层不太适应,国内的一些煤田勘探,仍以提钻取心钻探工艺为主,由于提钻取心的岩心采取率低,一定程度上影响了煤田钻探的施工质量。在国内金属矿区已普遍采用成功应用的绳索取心钻进工艺,能否应用到煤田勘探中,我们于2012年在黑山煤田进行了有益的尝试,经过施工7个钻孔的实践,取得了煤田绳钻施工中,在冲洗液配制的重要环节,如何选好、用好泥浆的初步经验。     

砂岩铀矿钻进工艺技术在煤田钻探施工中的应用

近几年煤田钻探施工实践证明，砂岩铀矿钻进工艺技术同样适用于煤田勘探施工，各种工艺技术的综合应用不仅满足了煤田勘探质量要求，且实现了煤田勘探的优质、高效、低耗和安全，可以在煤田钻探施工中大力推广应用。介绍了白音华煤田勘探矿区钻探施工中的一些具体做法。     

大口径冲击钻进工艺在河南张得煤田钻探孔中的应用

冲击钻进工艺是对付基岩、卵砾石和漂石地层等复杂地层的高效钻探技术,可以提高钻进效率并有效防止孔斜,目前主要应用于大口径工程钻孔（一般直径＞600 mm）,如钻孔灌注桩和水文水井钻探中。在河南省禹州市张得煤田预查矿区的钻进过程中,大口径冲击回转钻进工艺的应用有效解决了回转钻进导致孔斜过大的技术难题,并提高了钻进效率。     

渭北煤田澄合矿区复杂地层钻孔施工技术

渭北煤田澄合矿区属典型复杂地层,钻探施工难度大,钻探效率低。通过对钻探施工中的难点进行分析,总结了本地区钻探施工技术经验,针对钻探施工中存在的厚黄土层钻进、钻孔漏失和坍塌、岩石坚硬、粉煤采取等问题,提出了应对的技术措施和钻进施工工艺。     

甲魁煤田绳索取心液动锤钻进施工技术

甲魁煤田地质构造复杂,岩层破碎胶结松散,换层频繁,断层破碎带多。在钻探施工中导致孔内事故多、岩（矿）心采取率低、钻进效率低等问题。通过使用绳索取心液动锤钻进技术,解决了在该矿田钻探施工中遇到的技术难题,减少了辅助时间,提高了钻进效率和岩（矿）心采取率,保证了钻孔质量。     

中国东部海区科学钻探施工技术探讨

东部海区科学钻探工程是我国海洋地质研究中的一项重要工程,施工环境复杂,钻探施工难度大。根据地质预测和环境条件,针对实际情况,分析海上钻探施工的难点,提出了钻孔结构、钻进工艺、取心方法、冲洗液使用等方面的技术方案思路,以指导和保障钻探施工。     

宁东煤田采用S75绳索取心钻进情况

我队从1980年起逐步从金属（主要是铁）勘探转入煤田普查施工。几年来由于种种原因，钻探质量差（主要是煤心的采取和品质）、效率低一直是我队钻探生产中存在的主要问题，如1982年，完工钻孔13个优质孔率仅46.2％，台月效率仅286米，纯钻进时间仅27.5％。为了从根本上解决我队生产被动局面，加快煤田勘探速度，从适应四化建设对能源的需要，我队去年在宁东煤田矿区开动一台S75绳索取心试验钻机，探索这一钻进方法应用于煤田钻探施工的可能性。并与     

试析煤田绳索取心钻进的孔内安全问题

煤田钻探中,应用绳索取心工艺是不是会增加孔内事故?至今似乎尚未定论。因为,从几年来煤田钻探试用的情况来看,虽然有的钻孔取得了全孔无孔内事故的最好成绩,但是,也有因孔内事故而使全孔报废的现象。正因为如此,绳索取心钻进工艺对孔内安全到底有何影响,也一直得不到统一的认识。      

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

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.     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

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.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

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).     

NONMETALS DEPOSITS

正20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.)     

MATHEMATICAL GEOLOGY

正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology,     

PROSPECTING EXPLORATION

正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.)     

STRUCTURAL GEOLOGY

正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se-     

STRUCTURAL GEOLOGY

正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with