Middle Ordovician – Early Devonian carbonate deposits of Timan-Pechora Petroleum Province: criteria of oil and gas occurrence

2021 ◽  
pp. 37-46
Author(s):  
Inna Marakova
Keyword(s):  
Oil And Gas ◽  
Early Devonian ◽  
Middle Ordovician ◽  
Gas Occurrence ◽  
Carbonate Deposits

scholarly journals Prediction of Oil and Gas Occurrence in the Southern Part of Perm Krai Based on Regional 3D Modeling

2020 ◽  
Vol 20 (4) ◽  
pp. 317-330
Author(s):  
Aleksey L. Yuzhakov ◽  
◽  
Ivan S. Putilov ◽  
Keyword(s):  
Discriminant Analysis ◽  
Linear Discriminant Analysis ◽  
Oil And Gas ◽  
Structural Parameters ◽  
Linear Discriminant ◽  
Seismic Surveys ◽  
Geochemical Parameters ◽  
Individual Probability ◽  
Gas Occurrence ◽  
Perm Krai

The territory of the southern part of Perm Krai is well studied in terms of oil and gas prospecting. About 150 oil and gas fields have been discovered there, over 7000 deep wells have been drilled, and 3D seismic surveys have been completed on the area exceeding 5000 km2. The state of exploration of the territory allows us to have an immense array of geologic information, which can be used to search and predict oil and gas occurrence in structures that remain left out or that have not been studied yet. The research area was limited by the confines of Perm Krai in the south, west, and east and by a conventional line in the north along the boundary of the completed seismic surveys. To study the territory based on the reflecting horizon surface of Perm Krai, a 3D geological model has been built within IRAPRMS software system. The model calculates a regional, a zonal and local constituents of the reflecting horizon of Perm Krai. The local constituent allowed us to single out structures divided into three categories: structures of ascertained oil and gas occurrence, structures that do not contain oil and gas (empty), and structures for which a prediction is needed. In the model, structural parameters representing a trap potential for the accumulation and retention of hydrocarbons were calculated. Moreover, geochemical parameters showing a generation potential and a migration constituent, as well as hydrogeological parameters as indirect data to determine the saturation of structures with hydrocarbons, were downloaded into the model. The obtained data about the importance of each parameter for all structures allowed us to generate a single database and predict oil and gas occurrence by the machine learning method, i.e. through the step-bystep linear discriminant analysis. Based on the results of the linear discriminant analysis, 138 predicted structures were arranged in groups in accordance with degrees of their potential. By applying the built individual probability models, a map of the regional probability of structures’ saturation with hydrocarbons was obtained; this map served as a basis and amendment of oil and gas geological zoning boundaries of the southern part of Perm Krai.

Évolution paléogéographique de la marge nord-ouest de l'Afrique du Cambrien à la fin du Carbonifère (du Maroc au Libéria)

1991 ◽  
Vol 28 (7) ◽  
pp. 1121-1130 ◽  
Author(s):  
Michel Villeneuve ◽  
Jean-Jacques Cornée
Keyword(s):  
West African ◽  
The West ◽  
Lower Paleozoic ◽  
West African Craton ◽  
Middle Cambrian ◽  
Early Devonian ◽  
Middle Ordovician ◽  
The North ◽  
Marine Platform ◽  
General Regression

Paleogeographic reconstructions of Paleozoic time are presented for the northwest margin of the West-African Craton. An extensional regime and a marine transgression were dominant during the Early Cambrian. During the Middle Cambrian, the Rokélides orogen was responsible for the sea regression to the south, while the proto-Atlantic opening was active to the north of the Reguibat shield. A large stable marine platform was present during Early and Middle Ordovician. A general regression and the formation of the West-African Inlandsis took place during the Late Ordovician. During Silurian time, this sea transgressed over most of the African platform. Incipient Hercynian deformations during the Early Devonian produced horsts and grabens in Morocco. At the end of the Devonian and the beginning of the Carboniferous, the sea was restricted to isolated basins and tectonic trenches. Collision between West Africa and North America during the Late Carboniferous transformed the Lower Paleozoic margin into an Hercynian orogenic belt, whose structure is controlled by the presence of crustal blocks, generated as early as the Cambrian, and probably reflecting, in turn, older Panafrican zones of weakness. [Translated by the Journal]

The amalgamation of Pangea: Paleomagnetic and geological observations revisited

2020 ◽  
Author(s):  
Lei Wu ◽  
J. Brendan Murphy ◽  
Cecilio Quesada ◽  
Zheng-Xiang Li ◽  
John W.F. Waldron ◽  
...  
Keyword(s):  
Selection Criteria ◽  
Late Paleozoic ◽  
Geological Data ◽  
High Quality ◽  
Early Devonian ◽  
Polar Wander ◽  
Middle Ordovician ◽  
Oblique Convergence ◽  
Q Factors ◽  
European Variscides

The supercontinent Pangea formed by the subduction of the Iapetus and Rheic oceans between Gondwana, Laurentia, and Baltica during mid-to-late Paleozoic times. However, there remains much debate regarding how this amalgamation was achieved. Most paleogeographic models based on paleomagnetic data argue that the juxtaposition of Gondwana and Laurussia (Laurentia-Baltica) was achieved via long-lasting highly oblique convergence in the late Paleozoic. In contrast, many geology-based reconstructions suggest that the collision between the two continents was likely initiated via a Gondwanan promontory comprising the Iberian, Armorican, and Bohemian massifs, and parts of the basement units in the Alpine orogen during the Early Devonian. To help resolve this discrepancy, we present an updated compilation of high-quality paleopoles of mid-to-late Paleozoic ages (spanning Middle Ordovician and Carboniferous times) from Gondwana, Laurentia, and Baltica. These paleopoles were evaluated with the Van der Voo selection criteria, corrected for inclination error where necessary, and were used to revise their apparent polar wander (APW) paths. The revised APW paths were constructed using an innovative approach in which age errors, A95 ovals, and Q-factors of individual paleopoles are taken into account. By combining the resulting APW paths with existing geological data and field relationships in the European Variscides, we provide mid-to-late Paleozoic paleogeographic reconstructions which indicate that the formation of Pangea was likely initiated at 400 Ma via the collision between Laurussia and a ribbon-like Gondwanan promontory that was itself formed by a scissor-like opening of the Paleotethys Ocean, and that the amalgamation culminated in the mostly orthogonal convergence between Gondwana and Laurussia.

Conodont biostratigraphy and paleoecology of Middle Ordovician rocks in eastern Oklahoma

1989 ◽  
Vol 63 (1) ◽  
pp. 92-107 ◽  
Author(s):  
Jeffrey A. Bauer
Keyword(s):  
New Species ◽  
Conodont Biostratigraphy ◽  
Middle Ordovician ◽  
Two New Species ◽  
Shallow Subtidal ◽  
Conodont Fauna ◽  
Carbonate Deposits

Conodonts from the upper Burgen, Tyner, and Fite Formations (Middle Ordovician) of eastern Oklahoma include two new species, Phragmodus harrisi and Plectodina tynerensis. The conodont fauna indicates that the upper Burgen through middle Tyner is Whiterockian (pre- to earliest Chazyan) and that the upper Tyner–Fite is probably Kirkfieldian in age.The Whiterockian Burgen–Tyner preserves a regressive succession of shoreface, lagoonal, and intertidal deposits. That change is reflected by the conodont succession, which shows replacement of a fauna dominated by species of Neomultioistodus, Scandodus?, and Paraprioniodus by one dominated by species of Phragmodus, Plectodina, and Erismodus.Carbonate deposits of the Kirkfieldian(?) upper Tyner and Fite Formations follow a major hiatus and reflect shallow, subtidal to intertidal conditions. The conodont fauna is composed of species of Aphelognathus, Plectodina, Curtognathus, Erismodus, and Oulodus, among others.

scholarly journals Muenstraia, ein neues Rugosa-Genus (Anthozoa) aus dem Obersilur und Unterdevon

Fossil Record ◽  
2001 ◽  
Vol 4 (1) ◽  
pp. 71-82 ◽  
Author(s):  
D. Weyer
Keyword(s):  
Type Species ◽  
New Genus ◽  
New Taxon ◽  
Early Devonian ◽  
Middle Ordovician ◽  
Traditional Definition ◽  
The Family ◽  
Definition Of

<i>Muenstraia</i> n. gen. ist eine der ältesten ahermatypischen Rugosa (Subordo Cyathaxoniina) und umfasst neben der Typusart <i>Muenstraia franconica</i> n. sp. (Ludlovium, Elbersreuther Orthoceratitenkalk, Frankenwald) drei weitere Arten: <i>Muenstraia squarrosa</i> (Sutherland, 1965) (unteres Ludlovium, Henryhouse-Formation, Oklahoma), <i>Muenstraia</i> sp. (oberes Lochkovium, Yukon-Gebiet), <i>Muenstraia thuringica</i> n. sp. (Pragium, Thüringisches Schiefergebirge und Tafilalt). Die Gattung kann von dem isolierten, nur aus Xinjiang bekannten Protozaphrentis Yü, 1957 des hohen Mittelordoviz abgeleitet werden; wichtige Deszendenten im Ludlovian sind <i>Laccophyllum</i> Simpson, 1900 und Sutherlandinia Weyer, 1972. <br><br> Der Bauplan entspricht dem seit Schindewolf (1931) traditionellen Konzept der Gattung <i>Petraia</i> Münster, 1839, die aber nach Revision (Weyer 2000) ihrer wahren Typusart <i>Petraia decussata</i> Münster, 1839 aus dem oberen Famennium einer anderen Entwicklungsreihe angehört (Neaxoninae Hill, 1981, jetzt Petraiidae Koninck, 1872). Für die dadurch namenlos gewordene Familia "Petraiidae" (etwa sensu Hill 1981) werden die bisher als Synonym ruhenden Protozaphrentidae Ivanovskiy, 1959 verfügbar, denen noch <i>Duncanella</i> Nicholson, 1874 sowie die Sutherlandiniinae Weyer, 1972 und die Ditoecholasmatinae Sutherland, 1965 zugeordnet sind. <br><br> Muenstraia, a new genus of Rugosa (Anthozoa) from the Late Silurian and Early Devonian <br><br> The new taxon, one of the most ancient members of the ahermatypic suborder Cyathaxoniina, includes the type species <i>Muenstraia franconica</i> n. sp. (Ludlovian, Elbersreuth <i>Orthoceratites</i>-Limestone Formation. Upper Franconia, Germany) and three further species: <i>Muenstraia squarrosa</i> (Sutherland, 1965) (lower Ludlovian, Henryhouse Formation, Oklahoma, USA), <i>Muenstraia</i> sp. (upper Lochkovian, Yukon Territories, Canada). <i>Muenstraia thuringica</i> n. sp. (middle/upper Pragian, Tentaculitid Limestone Formation, Thuringian Mountains, Germany, and middle Pragian, Tafilalt, Morocco). The genus descends from the isolated Upper Middle Ordovician <i>Protozaphrentis</i> Yü, 1957, only known from Xinjiang in China; it is the ancestor of two new phylogenetic lines starting in the Ludlovian with <i>Laccophyllum</i> Simpson, 1900, and <i>Sutherlandinia</i> Weyer, 1972. <br><br> Morphology and diagnosis are identical with the (since Schindewolf 1931) traditional definition of the genus <i>Petraia</i> Münster, 1839, which represents according to a revision of its real and Upper Famennian type species <i>Petraia</i> <i>decussata</i> Münster, 1839 (Weyer 2000) another phylogenetic line (Neaxoninae Hill, 1981, now Petraiidae Koninck, 1872). Therefore, the valid name of the family "Petraiidae" (sensu Hill 1981) becomes Protozaphrentidae Ivanovskiy, 1959, which comprise also <i>Duncanella</i> Nicholson, 1874, and both the Sutherlandiniinae Weyer, 1972 and Ditoecholasmatinae Sutherland, 1965. <br><br> doi:<a href="http://dx.doi.org/10.1002/mmng.20010040106" target="_blank">10.1002/mmng.20010040106</a>

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