Integrated biostratigraphy of the upper Oligocene–middle Miocene successions in west central Sinai, Egypt

2014 ◽  
Vol 100 ◽  
pp. 379-400 ◽  
Author(s):  
Abdel Galil A. Hewaidy ◽  
Sherif Farouk ◽  
Haitham M. Ayyad
Keyword(s):  
Middle Miocene ◽  
Upper Oligocene ◽  
West Central

scholarly journals The Late Eocene – Recent <i>Bradleya johnsoni</i> Benson lineage (Crustacea, Ostracoda) in the Central Equatorial Pacific

1988 ◽  
Vol 7 (2) ◽  
pp. 187-199 ◽  
Author(s):  
P. Lewis Steineck ◽  
David Yozzo
Keyword(s):  
Middle Miocene ◽  
Late Eocene ◽  
Equatorial Pacific ◽  
General Increase ◽  
Reticular Pattern ◽  
Lower Oligocene ◽  
Upper Oligocene ◽  
Central Equatorial Pacific ◽  
Stratigraphic Ranges ◽  
Direct Ancestor

Abstract. Three stratigraphically successive species of Bradleya Hornibrook, 1952 from abyssal sediments of the central equatorial Pacific (Leg 85, Deep Sea Drilling Project) form an unbranching evolutionary sequence designated as the B. johnsoni Benson lineage. These taxa are B. sp. 1 (Lower Oligocene), B. johnsoni (Upper Oligocene – Middle Miocene) and B. thomasi n. sp. (Upper Miocene – Recent). A shared synapomorphic character, the posterior bridge complex, establishes the kinship of these species. Their stratigraphic ranges and a traceable series of changes in the organisation and mass of the reticulum are consistent with the hypothesis of direct ancestor/descendant relationships between them. Bradleya johnsoni is distinguished from B. sp. 1 by the appearance of new primary muri in the posteroventral region and by a general increase in reticular mass. In B. thomasi, the overall reticular pattern is maintained but it becomes more delicate and less rectilinear. Each species of this lineage shows similar variation in the posteroventral reticulum.

scholarly journals Geometry of Cauto-Guacanayabo basin, Cuba

Bionatura ◽  
2019 ◽  
Vol 02 (Bionatura Conference Serie) ◽  
Author(s):  
Yaniel Misael Vazquez Taset
Keyword(s):  
Middle Miocene ◽  
Middle Eocene ◽  
Strike Slip ◽  
Upper Eocene ◽  
San Luis ◽  
Upper Oligocene ◽  
New Knowledge ◽  
Eastern Cuba ◽  
The Relationship ◽  
Seismic Lines

The Cauto-Guacanayabo basin is located in the southern part of the Guacanayabo-Nipe tectonic corridor, Eastern Cuba, and records the evidence of the evolution of the Cuban Orogen. The objective of this work is to determine the geometry of the sedimentary infill of the basin, as well as the relationship between the units that constitute it. This study is based on the interpretation of several 2D seismic lines, geological data of surface and boreholes. Four tectonosequences have been defined (TSA, TSB, TSC, TSD) delimited by four regional unconformities in the basin (U-0, U-1, U-2, U-3). The TSA is formed by Charco Redondo, Puerto Boniato, Farallón Grande and San Luís formations, with ages from the middle Eocene to the upper Eocene. The Sevilla Arriba, Paso Real, Camazán and Güines formations constitute the TSB; its age varies between the upper Oligocene and the middle Miocene. The TSC covers a period of age between the middle Miocene and the lower Pliocene and is composed of the Cabo Cruz and Manzanillo formations. The TSD is formed by the Río Maya, Dátil, Bayamo, Cauto, Jaimanitas, Villarroja, Río Macío, and Jutia formations, and the informal stratigraphic unit Marga Demajagua. The age of this tectonosequence varies between the upper Pliocene and the Holocene. This study brings new knowledge about Cuban synorogenic strike-slip basins. In addition, it allows us to understand how the complexity and compartmentalization of the sedimentary infill of the basin are the results of the evolution of the Cauto-Nipe sinistral strike-slip fault.

POST-MIDDLE MIOCENE TRANSTENSION IN THE PLOMOSA MOUNTAINS AND DEVELOPMENT OF THE LA POSA PLAIN, WEST-CENTRAL ARIZONA

2018 ◽  
Author(s):  
Evan D. Strickland ◽  
◽  
John S. Singleton ◽  
Michael R. Wyatt ◽  
Nikki M. Seymour
Keyword(s):  
Middle Miocene ◽  
West Central ◽  
Central Arizona

scholarly journals Evaluation of oil shows in Middle-Miocene at block 02 of cuu long basin based on some of well data

2013 ◽  
Vol 16 (2) ◽  
pp. 48-63
Author(s):  
Luan Thi Bui
Keyword(s):  
Middle Miocene ◽  
Oil And Gas ◽  
Gas Field ◽  
Lower Oligocene ◽  
Upper Oligocene ◽  
Combining Data ◽  
Light Oil ◽  
Oil And Gas Field ◽  
Well Data ◽  
Formation Porosity

Up to now, reservoir system in Cuu Long basin have been known including Pre-Tertiary fracture basement, sandstone of lower-Oligocene formation (Porosity from 12 to 16%, permeability from 1 to 250 mD), sandstone of upper-Oligocene formation (Porosity from 12 to 21%, permeability from 2 to 26 mD), sandstone of lower-Miocene formation (Porosity from 14 to 28%, permeability from 1 to 1300 mD). However, the result of evaluation of analysis of data at block 02 is very good oil shows in sandstone of middle-Miocene formation, the gas oil ratios of this oil is from medium to high, predominantly light oil and hydrocacbon have not changed yet. The result of analysis of core samples and petrophysis data of sandstone of middle-Miocene is that porosity is from <10 to 31% and permeability is from 100 to 3066 mD. Following geology structure and combining data of seismic, petrology, stratigraphic and geochemical source rock indicated oil of middle-Miocene was relative with lower-Oligocene and upper-Oligocene. These rocks contain abundant of organic matters that could produce hydrocarbon well. Then, hydrocarbon migrated and accumulated into fold traps in lower and middle-Miocene. Proven reserves 1P (P50) of two reservoir sets BII .2.20 và BII .1.10 is 70.7 MMbbl and proven plus probable reserves 2P(P50) of two reservoirs BII .2.20 và BII .2.30 is 73.11 MMbbl. Discovering oil and gas in middle-Miocene at block 02 openes up new target in exploration of oil and gas field in margin zones of Cuu Long basin.

scholarly journals Lithostratigraphy of the Upper Oligocene – Miocene succession of Denmark

2010 ◽  
Vol 22 ◽  
pp. 1-92 ◽  
Author(s):  
Erik Skovbjerg Rasmussen ◽  
Karen Dybkjær ◽  
Stefan Piasecki
Keyword(s):  
North Sea ◽  
Middle Miocene ◽  
Three Dimensions ◽  
Marine Clay ◽  
Shallow Marine ◽  
North East ◽  
The North ◽  
Upper Oligocene ◽  
The North Sea ◽  
Delta Progradation

This paper presents a revised lithostratigraphic scheme for the uppermost Upper Oligocene – Miocene succession of Denmark. The marine Oligocene Brejning Clay Member is upgraded to formation status and includes the Sydklint Member and the Øksenrade Member (new). The shallow marine and deltaic deposits of mainly Early Miocene age are included in the Ribe Group (new) while the fully marine Middle and Upper Miocene clay-rich deposits are referred to the Måde Group (new). The Ribe Group is subdivided into 6 formations: the Vejle Fjord Formation is revised and includes the Skansebakke Member, the Billund Formation (new) includes the Addit and Hvidbjerg Members (new), the Klintinghoved Formation is redefined formally and includes the Koldingfjord Member (new), the Bastrup Formation (new) includes the Resen Member (new), the Vandel Member is a new member in the Arnum Formation (revised), the Odderup Formation is redefined and includes the Stauning Member (new) and the coalbearing Fasterholt Member. The Måde Group is subdivided into the Hodde, Ørnhøj (new), Gram and Marbæk (new) Formations. Subdivision of the Upper Oligocene – Miocene succession into two groups, the Ribe and Måde Groups, is compatible with the North Sea lithostratigraphic framework where they correlate with the upper part of the Hordaland Group and the Nordland Group, respectively. The revised lithostratigraphic framework correlated in three dimensions provides rigorous constraints on the palaeogeographic interpretation of the Late Oligocene – Miocene period. Three major deltaic units (Billund, Bastrup and Odderup Formations) prograded from the north and north-east into the North Sea Basin during the Early – early Middle Miocene. Delta progradation was punctuated by deposition of marine clay and silt associated with minor transgressive events (Vejle Fjord, Klintinghoved and Arnum Formations). During the Middle–Late Miocene, marine depositional conditions dominated (Hodde, Ørnhøj and Gram Formations). A fourth and final progadational event (Marbæk Formation) commenced in the latest Tortonian heralding the emergence of present-day Denmark (including the North Sea sector).

Sign in / Sign up

Export Citation Format

Share Document