Ordovician

It was an important evolution and marked the end of transgression and regression cycle of the Cambrian and Ordovician in Tarim area.

The tectonic framework of North Qilian in Early Ordovician should be similar to that of the Bafin Bay and the Queen Elizabeth Islands.

tussles at the International Commission on Stratigraphy over the boundaries of the Ordovician era do not normally capture headlines.

The configuration of Ordovician of lower Palaeozoic system highly inherits that of Archaean group and both have a strong consistency.

This proposed method has been used for quality evaluation of natural Gamma spectral log in the Ordovician carbonate strata in Tahe oilfield.

The long distance thrust system is composed of Ordovician and Silurian and some part of it shows as a klippe.

The Middle and Upper Ordovician is one of the main target zones of oil and gas in the Central Tarim area.

Ordos Basin, China's second-largest gas basin gas reservoirs are developed in Jingbian field at the top of the Ordovician weathering crust.

The Early Caledonian movement resulted in a pseudo-conformity between Cambrian and Lower Ordovician.

Fractures and caverns are the main spaces of carbonate reservoirs of the Ordovician system in Tahe Oilfield.

Moreover, the hydrocarbon pooling conditions of Lower Ordovician indicates that it's quite likely to get industrial gas flow.

and spacing distribution and thickness variation of both aquifer and aquifuge in the upper portion of Ordovician system are also determined.

The result of petroleum exploration in the Cambrian - Ordovician, the theoretical knowledge and the hydrocarb. . .

The Global Boundary Stratotype Section and Point (GSSP) for the base of the Hirnantian Stage (Upper Ordovician) is defined at a point 0.

Ordovician in Tahe oilfield belongs to carbonate reservoir, fracture and corrosion cavern are acting on oilfield reservoir and permeability.

Ordovician distributed mainly in Shanbei paleo-depression and South margin paleo-depression but default in part of central paleo-uplift.

This was the result from the large-scale regression in the Late Ordovician.

The contact relation was unclear within the Ordovician in Lunnan area of Tarim basin due to lack of related information.

The Lower Palaeozoic group mainly includes Cambrian , medial and lower Ordovician, which are marine carbonate in the district.

A paleomagnetic study on Ordovician to Permian rocks from the Yili Block and its adjacent areas was performed.

Tarim Ordovician carbonate reservoir is the main target stratum of exploratory area for Tarim Oil Field Company.

The transition between the Cambrian and the Ordovician periods is crucial in evolutionary history.

Late Ordovician organic reefs composed of cyanophyta and calcareous sponge were firstly discovered in northern Tarim basin.

In the Ordovician, Silurian Period, the Devonian, Carboniferous, the advent of low amphibians and ancient ancient reptiles.

Ordovician strata in Tahe oilfield belong to carbonate reservoir with well developed fractures and dissolution pores.

The salts are continental source and come from the Cambrian and Ordovician systems of the surrounding uplifts .

It is not an isolated reservoir, but is a part of the Ordovician buried bill reservoirs in this area.

Meantime the top of Ordovician also belongs to same period surface which formed by long period erode.

Many reverse faults develop in Ordovician palaeokarst in Tahe region, which include mainly NW, and NE, and EW, and SN directional.

The petroleum geochemistry shows its oil and gas of marine facies originated from the Cambrian -Ordovician source rocks.

Steeply dipping Middle Ordovician Austin Glen Formation (on right) overlain by moderately dipping Upper Silurian Roundout Formation.

late Ordovician volcanic-subvolcanic formation.

The Ordovician internal-tide and internal-wave deposits in West Zhejiang and Tarim Bas in are typical cases in this field.

The gold mine origins from the gold enriched volcanic and sedimentary rock of Ordovician, Carbonic and Dias .

Kongquehe slope and Kuruketag uplift is in extension, prototype basin is continental rift basin during Cambrian to Ordovician.

There developed a vast area of weathering crust karst reservoirs on top Ordovician in Ordos Basin.

Paleo-karst was developed in Ordovician limestones at the west of Lungu area in Tarim basin.

The China paleo-plates splitted into North China and Yangtze paleo-plates and Qinling limited ocean basin in middle Ordovician Epoch.

The Central Paleouplift described by Ordovician top surface was merely present during late Cambrian to last stage of Shihezi.

As we have studied, the fissure system of the Tahe oilfield in its Ordovician carbonate reservoir is very complex.

Island-arc pluton consists of diorite to granite, which formed in Ordovician.

considered that the Cambro-Ordovician karstic fissure aquifer is the major aquifer in the area.

However, some researchers believe that a GRB was responsible for the Ordovician mass extinction approximately 450 million years ago.

In latest Middle Ordovician, affected by Qilian ocean closed, this cold rift vanished because of the reformation.

The three times of oil generation of middle - lower Ordovician source rocks happened in late Caledonian, Yanshanian and late Hercynian.

In addition, in the late Ordovician, Carboniferous and Silurian, tazhong area may have small-scale volcanic activity.

Bitumen impregnations is common in cores of the Lower Ordovician Penglaiba Formation of Well Lun- shen 2 in Lungu area, the Tarim Basin.

The seal in Yingnan-2 gas reservoir is specially tight sand and the natural gas is wet gas derived from Cambrian Ordovician source rocks.

The third period of the Paleozoic era, the Silurian follows the Ordovician period and precedes the Devonian.

The Ordovician ice age happened 444 million years ago, and records have suggested that CO2 levels were relatively high then.

Based on the related geological data, the present tectonic stress filed of Ordovician is simulated using 3D finite element method.

The Ordovician palaeokarst had gone through 3 evolution stages and there are 7 types of developed patterns in the Huanghua Depression.

The Cambro-Ordovician is very thick and widely distributed in Tarim basin.

There are some fluid inclusions in the fillings of dissolved void of Ordovician carbonate rock in the Ordos basin.

Geochemical characteristics and its sedimentary environment significance of the Ordovician in western margin of Ordos Basin

Characteristics of hydrocarbon enrichment along the Ordovician carbonate platform margin in the central uplift of Tarim Basin

Chemical Analysis and Origin of Calcite Filled in and Cave With in Ordovician Carbonates in Tahe Oilfield, Xinjiang

An evaluation of Ordovician hydrocarbon source rock and its lower limit of organic abundance in Dagang area, Huanghua depression

Recognition of the classification, biostratigraphy and biogeography of the Ordovician and Silurian rugose corals in the Yangtze Region

Experimental study of sensitivity of Ordovician carbonate formation in Middle Tarim

Ordovician conodonts from Kalpin of Xinjiang and Pingliang of Gansu across the base of Upper Ordovician Series

Research on Development Regularity of Ordovician Limestone Karst and Environmental Hydrogeological Problems in Hancheng Coal Mining Area

Multi-sources information fusion method and its applications in prediction of water inrush of ordovician limestone aquifers in colliery

Deep fluid activity in middle and western Ordos Basin, Northwest China and its heating effect on hydrocarbon generation in Ordovician

Genesis of the fluorite in the Ordovician and its significance to the petroleum geology of Tarim basin

Discussion on relation between paleobiogeographical division of the Cambrian and Ordovician in Qilian and Qinling areas

Ordovician graptolite fauna characteristics and sedimentary environment of Gongcheng, Guangxi, Chin

Application of Time Domain Electromagnetic Prospecting Technology in the Leading Survey of Confined Area with Ordovician Limestone

The genetic classification and evaluation of the Lower Ordovician carbonate reservoirs in the Tahe Oil Field, Xinjiang

Sedimentary Successions and Environments of the Late Ordovician Wenchang Formation in Tonglu, Zhejiang

"Apparent porous medium" identification and establishment in the Ordovician carbonate reservoir, Jingbian Gas field, Ordos Basin

Geological-geophysical signatures and controlling factors of the Ordovician buried hills in Central Tarim Basin

Application of GR spectroscopy log in stratigraphic classification of the Ordovician formation in Tahe oilfield

Determination and its significance of ancient oil pools in Ordovician weathering crust, Ordos basin

Lithofacies Paleogeography of Majiagou Age of Ordovician in Ordos Basin

Ordovician turbidite and its potential in gold exploration in Heilongjiang Province

Research on Hydrocarbon Generation of Ordovician Marine Carbonatite of the Ordos Basin and Genesis of Changqing Gas Fields

An Ordovician magmatic arc at the northern foot of Dabie mountains: Evidence from geochronology and geochemistry of intrusive rocks

Reservoir Characteristics and Formation Mechanisms of the Ordovician Carbonate Pools in the Tahe Oilfield

Characteristics of Molecular Geochemistry of Ordovician Dissolved Hydrocarbons in the Central Part of Ordos Basin

Evaluation on water richness of Ordovician limestone in south-western shandong coal-field with comprehensive prospecting method

The Characteristics and the Potential of Secondary Hydrocarbon Generation of Ordovician Source Rock in Zhongyuan Petroleum Province

Genetic classification and distribution of Ordovician carbonate buried-hills in Huanghua depression, Bohai Bay basin

Uranium Disequilibrium in the Cambrian-Ordovician Aquifer System of Southwest Datong and Its Application for Groundwater Research

Characteristics and tectonic signification of Ordovician granites in northern Damao, Inner Mongolia

The logging interpretation of the Lower Ordovician solution intervals of the Tahe oil field, Xinjiang

Sequence stratigraphic framework and its control on development of Ordovician carbonate reservoir in Tarim basin

Middle-Upper Ordovician Internal-wave and Internal-tide Deposits and Their Significance of Petroleum Geology in the Central Tarim Basin

Ordovician Limestone Water Disaster in Gaocheng Coal Mine and Comprehensive Controlling Technology

Study of Ordovician weathering crust karst reservoirs in Ordos Basin

Ordovician Limestone Water Disaster in Gaocheng Coal Mine and Comprehensive Controlling Technology

Study of Ordovician weathering crust karst reservoirs in Ordos Basin

Hydrogeologic characteristics of Ordovician system in West Yanzhou, Shandong Province

Hydrocarbon generation capacity of marine carbonatite of the middle Ordovician on the south slope of Huimin sag

Study on Outcrop Sequence Stratigraphy of the Lower-Middle Ordovician Strata in Keping Tarim Basin

Discussion on Development Regularities of Karst Cave on Top of the Ordovician of Tahe Oilfield and Relation in Oil-Gas

Strontium isotope composition of marine carbonate and the influence of diagenetic fluid on it in Ordovician

reserve classification and evaluation; boundary of reserves; Ordovician; fractured-vuggy reservoirs; Tahe oilfield;

Controls of karstification on the Ordovician carbonate reservoirs of the Xayar uplift in Xinjiang

Diagenetic patterns and pore systems of the Lower Ordovician Majiagou Formation reservoirs of the central Changqing gas fields

Development characteristics of organic reef-bank complex on Ordovician carbonate platform margin in Tarim Basin

Ordovician- Silurian sedimentation and diagenesis in northeastern Tarim basin

The application of seismic attribute technique to predict Ordovician limestone karst fractured zones

Logging Evaluation of the Ordovician Carbonate Reservoirs in Lunan Buried-hill, Tarim Basin

Study of Sequence Stratigraphy at Terminal of Ordovician

Permissive Mining Yield of an Ordovician Limestone Mineral Water Source Site in Renjiadian, Shouyang, Shanxi

The sedimentary environment and genesis of Middle Ordovician nodular limestones in Keping, Xinjiang

Formation Condition and Exploration Potential of Ordovician Natural Gas Reservoir in Western Ordos Basin

Hydrocarbon generation of Ordovician carbonate source rocks in Huanghua Depression

Migration characteristics of Ordovician weathered crust natural gas in central Eerduosi Basin

The growth laminates of biological shell and the evolution of orbital parameters of the Earth-Moon from Ordovician to Quaternary

Molecular geochemical characteristics of Cambrian-Ordovician source rocks in Tarim Basin, NW China

Prevention and control of great thick Ordovician karst water during coal mining in seam of Taiyuan Group

Hydrocarbon Potential Study of Cambrian-Ordovician in Kongquehe Slope Zone of Tarim Basin

Rare Earth Elemental Characteristics of Ordovician-Jurassic Mudstone in Tabei Uplift, Tarim Basin

Probe into Chemical Properties and Forming Mechanism of Karst Water in Ordovician Limestone of Hancheng Mining Area

The Developmental Characters of Sedimentary Environments and Lithofacies of Middle Ordovician Majiagou Formation in Ordos Basin

Analyses on main controlling factors of carbonate reservoirs of Ordovician system in the southwest margin of Ordos Basin

reef-bank; sequence stratigraphy; base level; Ordovician; carbonate rock; Tarim Basin;

Reserve calculation for Ordovician fracture - cavity reservoirs in Tahe Oilfield

Characteristics of Cambrian-Palaeo-ordovician Strata Sequences in Zaozhuang Area

Quantitative Prediction of Ordovician Petroleum Resources in Tahe Oilfield

Records of Carbon and Oxygen Isotopes from the Cambrian and Lower Ordovician Carbonates in Yichang Area, Hubei Province

Hydrocarbon Indicator Significance of Organic Inclusions in the Ordovician Reservoir in Tahe Oil Field

The possibility of detecting water in the Ordovician carbonate with objective seismic exploration

Ordovician Carbonate Fractured-vuggy Reservoir in Tahe Oilfield, Tarim Basin: Characteristics and Subdivision of Fracture-Vug Units

Ordovician Cephalopoda Biofacies and Their Provincialization in the South China

Trace Elements and Sedimentary Settings of Cambrian-Ordovician Carbonates in Bachu Area, Tarim Basin

Karst water prevention and control technology for Ordovician limestone with high pressure water

Analysis of Sedimentary Characteristics and Evolution of Early Ordovician in Central Tarim Area

Carbonate Reservoir Features in Buried Hill of Ordovician System in Tahe Oilfield and Their Log Evaluation

Cambrian-Ordovician boundary and stratigraphic division in the Yaowangshan area, Qingzhou, Shandong Province, China

Distribution and Controlling Factors of Ordovician Karst Reservoirs in Dagang Region

Paleocurrent energy study with inclusion of calcite gangue for Ordovician system in central Ordos basin

Characteristics and genesis of reef-bank facies reservoirs with dissolution pores in Ordovician Yijianfang Formation in Tahe oilfield

Analysis of the Ordovician sequence stratigraphy in southern Anhui

Fluid inclusion evidences for the orders of thermal fluid activities in the Ordovician of Tahe oil field

Distribution of the Middle-Late Ordovician reef bank reservoir in Central Tarim Basin

Technology of Water Disaster Controlling and Rescue when Coal Mining over Ordovician and Cambrian Limestone Water in He'nan Coal Mine Zone

A study on validity identification of source rock by new experimental techniques for Ordovician in Ordos basin

Differentiation and Analysis of Ordovician Reservoir Types in South Slope of Tabei Uplift, Tarim Basin

paleo-landform; Jurassic Period; Ordovician Period; migration of oil and gas; distribution of oil and gas;

Reservoir Characteristics and Gas Layer Reconstruction in Majiagou Formation of Ordovician in Fuxian Exploration Area

Distribution and exploration potential of Ordovician reservoir in Ordos basin

Fluid inclusions analysis of the Ordovician reservoir in Tahe Oilfield

Harness Technology for Karst Water in Ordovician Limestone With Underground Grouting of Hole

Some Cognition on Characteristics of Ordovician Carbonate Reservoirs in Tahe Oil Fields

Forming mechanism and prevention of water-coal-burst disaster on extremely inclined faces under Ordovician aquifer

Study on Reservoir Properties of Carbonate Rock at the Lower Ordovician of Ordos Basin

Sedimentary Environment of Carbonate Source Rocks of Middle-Upper Ordovician in Tarim Basin

Sedimentary facies and source rocks of the Sinian-Cambrian-Ordovician strata in the Kuruktag-Konqi region, Xinjiang

Characteristics of burial dissolution in the Ordovician limestone of Tahe Oilfield

Tidal Rhythmites in Cambrian-Ordovician, North China and Evolution of Orbit Parameters

Geophysical Characteristics of Ordovician Reef Outcrops in Tarim Basin

Sequence stratigraphy of Lower Ordovician reef-bearing strata in the Middle Yangtze platform

Mechanism of Deep Burial Dolomitization of Massive Dolostones in the Middle Maj iagou Group of the Ordovician, Ordos Basin

The Formation Pressure Analysis of Ordovician Reservoir in Tahe Oilfield, Tarim Basin

Well logging evaluation of Ordovician carbonate reservoir in central Tarim basin

Restoration of Erosion Thickness of Upper Cambrian-Ordovician in Southwest Area of Tarim Basin

Development Pattern and Distribution Rule of Source Rock of Cambrian-Ordovician in Tarim Basin

Anomaly analysis of logging data from the Ordovician carbonate reservoirs in Tahe Oilfield

Cambrian-Ordovician boundary on the southern Liaodong Peninsula

Ordovician fossil karst cave reservoir recognition maker and prediction in Tahe oil field

The developed and evaluated patterns of Ordovician palaeo-karst in the Huanghua Depression

Aggregate material technology for Ordovician limestone water treatment in Niuerzhuang Mine

Formation Condition of Large-scale Oil-gas Pool in Ordovician Carbonate Rock in the Tahe Oil Field, Tarim Basin

Characters of Image Logging Response of Ordovician Horizontal Well in Tahe Oilfield

The Foundation of Imaging Logging Patterns of Ordovician Formation in Tahe Oilfield

The structural-interface evolution in Ordovician and karst reservoir in Ordos basin

The Structural Types and Depositional Characteristics of Carbonate Platform in the Cambrian-Ordovician of Tarim Basin

Safety mining technology for coal mining under aquifer in Ordovician limestone

Grey-heredity transverse prediction of solution-fissure and productivity of Ordovician reservoirs in No. 3 Tahe Oilfield

Ordovician Lithofacies Paleogeography of North Bohai Bay Basin

Prediction of the Ordovician fractured-vuggy carbonate reservoirs in Tahe oilfield

Prediction of the Ordovician and Silurian Reservoirs within Baxtopu Fracture Belt in Tarim Basin

Characteristics and Origin Analysis of Dolomite in Lower Ordovician of Tarim Basin

the first expelling hydrocarbon of Mid-Upper Ordovician source rock in about late Hercynian orogeny;

Time and space domains of hydrocarbon migration and accumulation in the Ordovician carbonates of the Huanghua depression

Precaution method of Ordovician limestone groundwater in bottom layer

The Features and Significance on Organic Maceral of Ordovician Source Rock in Ordos Basin

Controlling Effects of Fault over Ordovician Palaeokarst in Tahe Region

Control technology for special high pressure Ordovician limestone water disaster in Sanhejian Mine

Research on comprehensive treatment of mine ordovician water

Internal-tide Deposits of Upper Ordovician Flysch in Linan Area of Zhejiang Province

Geochemical Model of Compaction Released Water Karst in the Ordovician of Ordos Basin

Character and distribution about the reservoir and permeable body in Ordovician weathering crust in Tabmiao of north Ordos basin, China

A New Know of Characteristics and Genesis of Reef and Bank Facies Reservoirs in Ordovician Yijianfang Formation in Tahe Oilfield

The Late Ordovician Radiolaria from Fuping of Shaanxi province, China

Distribution Pattern of Ordovician Gas Reservoirs in Ordos Basin

Characteristics of Middle Ordovician Organic Reefs in Bachu Area

Viewing the Ordovician system of western fringe of Northern China platform from Zhuozi mountain

The Controlled Factors of Reservoir in the Ordovician of Middle-Eastern Ordos Basin

On Mechanism of Forming Ancient Karst Landform of Ordovician in Tare Oilfield

Aluminous mud rock seam Ordovician carst water Prevent water action;

Analysis of Control Factors of Ordovician Karst Reservoir in Ordos Basin

The environment isotopic character of Ordovician cast water in east of wei north

The factors analysis and control of water bursting from Ordovician limestone in Panxi Coal Mine

Prediction for under-salt reservoir of Ordovician in East Ordos basin;

The reason of Ordovician Karst water burst into 21102 working face and its control method in Sanhejian Coal Mine

Study on Eustatic Sea-Level Change Rule in Cambrian-Ordovician in Tarim Basin

Reservoir characteristics and development strategy of Ordovician fractured-vuggy reservoirs in block 4 of Tahe oilfield

The Significance of Ordovician Reef Discovery in Tarim Basin

A New Ordovician-Silurian Boundary Section in Guizhou, South China

The Importance of Late Caledonian Movement on Dagang Ordovician Reservoir Formation

Sea-level Change of the Central Yangtze Sea Basin in the Late Ordovician Wufengian Period

Reservoir Types of Cambrian and Ordovician in Leshan-Longnvsi Paleo-uplift Area

Study on Engineering Geologic Characteristics of Clay Marl of Ordovician System in the YRDP Area

Solution Spot Genetic Mechanism of Majiagou Formation in Ordovician of Ordos Basin

Formation of source-mixed gas reservoir in Ordovician weathering crust in the central gas-field of Ordos Basin

Characteristics of Fracture Systems in Ordovician in Central-east E'erduosi Basin

Application of Acid-Fracturing Technique in Superdeep Wells-an example from Ordovician Reservoir of Tahe Oilfield in Tarim Basin

An Analysis of Gas Sources of Ordovician Weathered Crust Gas Reservoirs in the Central Gas Field of Ordos Basin

Identifying the Paleocaves in Ordovician in Tabei Uplift by Electro-imaging Logs

Evaluation of Ordovician Water Resource in Zhaojiazai Mining Area

Reservoir prediction on carbonate buried hill reservoirs in Ordovician system of No. 4 area in Tahe Oilfield

Magmagenesis of Ordovician back-arc basins in the Northern Qilian Mountains

Ordovician Water Resources Assessment in Motaiying of Xiuwu

Depositional Environment Model of Middle Ordovician Majiagou Formation in Ordos Basin

Genesis of dioritic inclusions in Late Ordovician granitic rocks in the Yichun area

Paleo-karst and Distribution of Oil and Gas of Lower Ordovician in Akekule Area, Tarim Basin

Atlas of ordovician reservoirs in ordos basin

Reservoir Heterogeneity of Ordovician in District No. 4 Of Tahe Oilfield

Influence of Ordovician limestone water to mining No. 15 seam in Yangquan mine

The Geological Condition Analysis of Ordovician Paleo-kastification of Leshan longnvsi Paleohigh in Central Sichuan

Study on the terrain levels of Ordovician in HeNan

Preanalysis on the effect of ordovician limestone rockwater on mining in Yangquan coal mine

Geologic Features of Ordovician Oil Control in Akekule Arch

Lithofacies palaeogeography of the Late Ordovician in China

Research about the distribution of stress and the development of fractures in the Ordovician reservoir, Tahe Oilfield