The conodont study indicates that the thick carbonate rock strata belongs to the Majiagou Formation of the Middle Ordovician. The Upper part of the formation has the conodont fossil Erraticodon tangshanensis, the lower part is represented by Tangshanodus tangshanensis.
牙形石研究表明这套厚层质纯的碳酸盐岩地层属于中奥陶统的马家沟组，含有上部以Erraticodon tangshanensis为主，下部以Tangshanodus tangshanensis为特征的牙形石。
Controls of sedimentary lithofacies, karstification, tectonic disruption factors in Upper Ordovician reef-bank complex of Tazhong NO.1 slope break and Lower Ordovician Yingshan formation weathering crust.
塔中I号坡折带上奥陶统良里塔格组礁滩复合体和北部斜坡带下奥陶统鹰山组风化壳岩溶的发育主要受沉积相、岩溶作用和构造破裂三大因素控制。
Because of the Duyun Movement at the end of the Ordovician Aijiashan Epoch and the Guangxi Movement at the end of the Silurian Period, the Silurian System in Central Guizhou Uplift and its adjacent areas are not integrated.
奥陶纪艾家山世末期的都匀运动以及志留纪末期的广西运动所造成的古地理变迁，使得黔中隆起及周缘地区的志留系残留不全，沉积相带南浅北深。
The analysis of structural movement and expression shows that Qinqi tectonic active area is a volcano-sendimentary compressional depression formed by several times of compression movement from lower Proterozoic, and spreaded in the direction of north step by step till the forming of Xiangshan and Miboshan group in mid-later period of Ordovician, beating hardly with volcanical rock.
从秦祁构造活动带的构造形迹分析认为，该构造带是自下元古以来多期挤压环境下形成的火山—沉积压陷，并一期又一期向北蚕食，于奥陶纪中后期形成基本不含火山岩的米钵山组、香山群压陷岩系。
While the organic matters in the carbonate rock and the mud rock are all more than that in Ordovician, especially, source rock thickness of carbonate rock is a suite of very important marine facies source rock in Tarim basin.
而寒武系无论是碳酸盐岩还是泥岩，其有机质丰度均高于奥陶系，尤其是碳酸盐岩烃源岩厚度也较大，因而是塔里木盆地一套十分重要的海相烃源岩。
Through the analysis of Δd-δ^18O and fluid dynamic field, the authors consider that the Ordovician geothermal fluid precipitation came from northern Yanshan area, and drained to south and west.
通过δD-δ^18O及流体动力场分析，认为奥陶系流体均为大气降水，来自北部燕山地区，并向西向南排泄。
While the organic matters in the carbonate rock and the mud rock are all more than that in Ordovician, especially, source rock thickness of carbonate rock is a suite of veryimportant marine facies source rock in Tarim basin. source rocks, the Cambrian-Ordovician, the lunnan lower
而寒武系无论是碳酸盐岩还是泥岩，其有机质丰度均高于奥陶系，尤其是碳酸盐岩烃源岩厚度也较大，因而是塔里木盆地一套十分重要的海相烃源岩。
While the organic matters in the carbonate rock and the mud rock are all more than that in Ordovician, especially, source rock thickness of carbonate rock is a suite of very importantmarine facies source rock in Tarim basin. source rocks, the Cambrian-Ordovician, the lunnan lower
而寒武系无论是碳酸盐岩还是泥岩，其有机质丰度均高于奥陶系，尤其是碳酸盐岩烃源岩厚度也较大，因而是塔里木盆地一套十分重要的海相烃源岩。
However, the Pre-Sinian system, the Cambrian system, the Ordovician system, the Triassic system, the Jurassic system and the Cretaceous system slow down the formation of high Cd value belt.
区内锌矿、煤矿和磷矿开采过程中的尾砂、废水的堆积和排放是长江宜昌段Cd高值带的重要人为污染源。
Analysis of the morphological feature, diversity and abundance of graptolite, brachiopod and radiolariaindicated that the sea-level in the Yangtze basin underwent the change from rising to falling, then to risingagain during the latest Ordovician to the earliest Silurian interval, and the maxium rising episode appeared inthe lower Tangyagraptus typicus Subzone and the maxium falling at the top of the Guanyinqiao bed.
笔石、腕足类、放射虫的形态、分异度和丰度的研究表明：扬子海盆晚奥陶世晚期至志留纪初期，总体上，海平面经历了上升→下降→上升的变化，海平面上升的最大阶段发生在Tangyagraptus typicus亚带下部，到观音桥层顶部，海平面下降到最低点。
The middle-upper Ordovician entered into the peak of oil generation in early-middle Jurassic.
邻近满加尔凹陷的下奥陶统中部在泥盆纪早期就进入生油高峰，隆起带顶部在白垩纪早期才进入生油高峰。
Based on water quality analysis, it is judged that the source is Ordovician limestone.
通过水质分析，判定突水水源是奥陶系灰岩岩溶水。
Results indicated that this method is of feasibility for evaluating dangerousness of Ordovician limestone water invasion.
结果表明，该方法评价奥灰突水危险性直观、清晰、简洁，值得推广。
Excessive exploitation of groundwater in Ordovician limestone is the key reason for the formation of ground fissures.
在调查分析地裂缝时空分布特征的基础上，研究地裂活动与区内水文地质条件、地下水开采过程的关系，认为过量开采奥灰水是产生地裂缝的主导因素。
The Ordovician karst water is one of the hazards in the safe mining in North China. Mining above aquifer is one of the effective methods, which is used to exploit the coal seam threatened by water-inrush from floor.
奥陶系岩溶水是我国华北矿区煤矿安全生产的一大隐患，而带压开采是开采受底板突水威胁的煤层的有效方法之一。
The square-built dolomite flat containing karstenite and karstenite-dolomite flat in the Ordovician of middle-eastern Ordos Basin provide the favorable condition for the stratify development of pores and holes and the large acreage distributing.
鄂尔多斯盆地中东部奥陶系呈现出宽缓的盆缘含硬石膏白云岩坪与盆缘硬石膏白云岩坪相带，为孔洞型储层的成层发育、大面积展布创造了良好的条件。
Therefore the Ordovician-Silurian boundary should be defined by the FAD of N. persculptus displaying the geohistorical rhythm as the biomark, and by the not fully identical geological events as the supplementary marks for the global correlation.
在划分奥陶/志留系界线时，主张以笔石N.persculptus的首现为生物标志，以基本同时发生的地质事件为其辅助标志，以利于全球广泛对比。
The main heat-proof and temperature-preserving covers are Silurian and Ordovician argillite of Gaozaitian Formation and Meitan Formation. The main thermal reservoir layer is Cambrian carbonate rock of Loushanguan Group. The aquatic chemistry of the hot ground water and drilling data indicate that the reservoir depth ranges from 1300 to 2500m and the geothermal gradient from 2.44 to 2.84℃/100 m. It is pointed out that there may exist another geothermal field in the plunging part of the east limb of Wudang Anticline. Some suggestions are made about the development and protection of the geothermal field.
其主要隔热保温盖层为志留系高寨田群(S1g)和奥陶系湄潭组(01m)泥页岩，主要热储层为寒武娄山关群(∈2-3ls)碳酸盐岩，根据地下热水水质化学成份特征及钻探资料，其深度为1300-2500 m，地温梯度2.44-2.84℃/100 m；指出乌当背斜东翼倾伏端有另一地热田存在可能性；以及对地热田研究开发、保护的意见。
Tectonic evolution of northern Qaidam basin can be divided into 3 rift depression-compression cycles:① Sinian-early and middle Devonian cycle including Sinian-early and middle Ordovician rift-depression stage (the potential source rocks of Sinian-middle Ordovician dark carbonate rocks and mud shale developed), and late Ordovician-early and middle Devonian compression stage; ② Late Devonian-Triassic cycle composed of late Devonian-early Permian rift-depression stage (source rocks of Carboniferous platform-shelf dark muddy-shale, marl and limestones developed) and late Permian-Triassic compression stage; ③ Jurassic-Quaternary cycle involving Jurassic-Cretaceous inland rift-depression stage (Jurassic coal measure source rocks developed), and Tertiary-Quaternary compression stage.
柴达木盆地北缘构造演化可分为三大裂陷—挤压旋回：①震旦纪—早、中泥盆世旋回，分为震旦纪—早、中奥陶世裂陷阶段（发育由震旦系—中奥陶统暗色碳酸盐岩和泥页岩构成的潜在烃源岩系）和晚奥陶世—早、中泥盆世挤压阶段；②晚泥盆世—三叠纪旋回，分为晚泥盆世—早二叠世裂陷阶段（发育石炭纪台地—陆棚相暗色泥页岩和泥灰岩、灰岩构成的烃源岩系）和晚二叠世—三叠纪挤压阶段；③侏罗纪—第四纪旋回，分为侏罗纪—白垩纪陆内裂陷阶段（发育侏罗纪煤系烃源岩系）和第三纪—第四纪挤压阶段。
Analysis of three typical gas pools:gas condensate pool of Well Lunnan 59 Carboniferous and Well Tazhong 1 Ordovician and dry gas pool of Well Ma 4 Ordovician.
通过对轮南 5 9井石炭系、塔中 1井奥陶系凝析气藏和玛 4井奥陶系干气气藏三个典型气藏中天然气成因分析，识别出干酪根裂解气和原油裂解气，综合地质分析，总结出干酪根晚期裂解干气充注古油藏形成凝析气藏；古油藏晚期发生内部原油向气的热裂解形成凝析气藏；古油藏裂解形成的干气运移至新的圈闭形成干气气藏等 3种类型的气藏成藏模式。