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Keywords ordovician period;gas field;acidizing effect;pressure buildup curve; 奥陶纪;气田;酸化效果;压力恢复曲线;
Any of various large, segmented aquatic arthropods of the order Eurypterida that existed from the Ordovician Period to the Permian Period. （古生）板足鲎目的一种巨大的、有节的，属于板足鲎目的水生节肢动物，生存于奥陶纪到二叠纪时期
The generation of hydrocarbons of the Ordovician source is different from that of Mesozoic nd Cenozoic sources since there were on high plants in the Ordovician Period. 由于当时没有高等植物出现，因此奥陶系烃源岩在油气生成上与我国东部中、新生界陆相烃源岩有着明显的不同。
Five past extinctions: Some event near end of the Ordovician period, 440m years ago, wiped out almost all corals and fish, and 25 % of all families of creatures. 历史上曾发生过的5次物种大灭绝：4．4亿年前奥陶纪将要结束时的一些事件使几乎所有的珊瑚和鱼类以及25%25的物种灭绝；
Benxi water tunnel in the limestone is the Ordovician period under the EC-Hill Group and the EC in the Majiagou group, the role of a rock from development. 本溪水洞的石灰岩就是在这个时期的奥陶系下统亮山组和中统马家沟组时，经过岩化作用发育而成。
Bachu arch,one of hydrocarbon abundance units in Tarim basin,has experienced a series of rise and denudation as well as drop and sedimentation since Ordovician period. 巴楚凸起是塔里木盆地油气富集单元之一,自奥陶纪以来经历了多次隆升剥蚀与下降沉积的交替过程,经喜马拉雅运动期的断裂褶皱、抬升剥蚀,定型为塔西南前陆盆地的前缘隆起。
The forming of Sichuan Basin was closely relation with ancient geography and geological structure. Besides Yushan salt spring of Pengshui belonged to Ordovician period, others were mainly distributed to the layers of Jurassic and Triassic period. 四川盆地盐矿形成与古地理环境和地质构造密切相关,除了彭水郁山盐泉来自奥陶纪地层外,其余主要分布于侏罗纪、三叠纪岩层。
Keywords ordovician;aquifer;karst;Datun coal field; 奥陶系;含水层段;岩溶;大屯煤田;
Online access to the museum's catalogues is provided including databases for fossils, the Cambrian period, the Ordovician period, rock specimens, and the MacCulloch database of geological specimens. 还有一些岩石标本及地质学标本。
Enrichment of Au during the Ordovician period; 奥陶系富集Au;
Keywords Ordovician carst water Water burst factor Water burst coefficient; 奥灰水;突水因素;突水系数;
Keywords Eerduosi basin;Ordovician period;Unconformity;Play;Formation;Natural gas;Distribution; 鄂尔多斯盆地;奥陶纪;地层;不整合面成藏组合;天然气;分布;
STRATIGRAPHIC CLASSIFICATION OF THE ORDOVICIAN PERIOD OF GUILIN 桂林奥陶纪地层的划分
Keywords Talimu Basin;Middle;Ordovician Period;Humus;Gas source rock;Algae;Biological marker;Geochemical characteristic.; 塔里木盆地;中部;奥陶纪;腐殖质;气源岩;藻类;生物标志物;地球化学特征;
Keywords nonconformable paleo-landform;Jurassic Period;Ordovician Period;migra-tion of oil and gas;distribution of oil and gas; 侵蚀不整合古地貌;侏罗纪;奥陶纪;油气运移;油气分布;
Keywords Ordovician;Carbonate rock;Epigenic karstification;Buried dissolution;Tarim basin; 奥陶纪;碳酸盐岩;表生岩溶作用;埋藏溶蚀作用;塔里木盆地;
Keywords Ordovician;Carbonate reservoir;Fractured-vuggy reservoir;Reservoir characteristics;Tahe Oilfield;Tarim Basin; 奥陶纪;碳酸盐岩油气藏;缝洞型油气藏;油气藏特征;塔河油田;
Keywords horizontal well;casing program;hole trajectory;curvity;horizontal drilling;Carboniferous period;Ordovician period;Tahe Oilfield; 水平井;井身结构;井眼轨迹;曲率;水平钻井;石炭纪;奥陶纪;塔河油田;
Keywords Ordovician limestone water invasion;coefficient of water-resisting;dangerousness of water invasion; 奥灰突水;阻水系数;突水危险性;