Regional Geological Study and Potential Prediction of the Rio Del Rey Basin (RDR), Offshore Cameroon

2016 ◽  
Author(s):  
Khalid O. Altayeb ◽  
Su Yushan ◽  
Wu Shixiang ◽  
Chen Zhankun
Keyword(s):  
Upper Cretaceous ◽  
Oil And Gas ◽  
Slope Instability ◽  
Seismic Facies ◽  
Detachment Faults ◽  
The North ◽  
Oil And Gas Fields ◽  
Thrust Zone ◽  
Seismic Facies Analysis ◽  
Well Correlation

ABSTRACT Located in the eastern end of Niger delta; the Rio Del Rey (RDR) basin has a unique, complex multi-staged geological features and different types of Structures. This study has aimed to better understand the different structural and stratigraphic setting of the fields within the RDR basin and the way they control the hydrocarbon occurrences. To do that, an integrated 2D and 3D seismic interpretation was done targeting the toe thrust boundary, the upper Cretaceous unconformity and four key horizons of different depth levels in the Tertiary formations. Twelve regional profiles of contrastive orientations that cover the whole basin were interpreted to identify the regional structures; well correlation was done to identify the shallower tertiary settings while additional detailed grids of interpretation at the northeastern and southwestern corners and the seismic facies analysis of the whole RDR study area were used to classify the stratigraphic setting at the deeper regions. The results have revealed that the RDR basin is mainly controlled by thrusting, diapirism and detachment fault structures. The major toe thrust zone is found southern of Ngosso and trends in the northeast-southwestern direction. Gravitational tectonism becomes the primary deformation process shaping the structures as the sediments accumulation increases to the south and consequently, several shale ridges were formed. These ridges and their lateral movement from North to South along with the whole sediments increasing have caused a slope instability of the lower ductile Akata shale formation; what caused the forming of the detachment faults zone in the Northern and middle parts of the RDR basin. The Oongue Turbidites of Eocene were deposited in the northeastern part of the basin in deep water fans by the main sediments supply from the North and the East with various sand thicknesses due to the structural system. The hydrocarbon potential accumulations are found in the mid to upper Tertiary formations and the deeper Upper Cretaceous, but most of the oil and gas fields are located in shallower deltaic reservoirs associated with fault-bounded traps related to shale ridges and diapir structures. Considerable amounts of hydrocarbons were also found within the turbidites sands of Oongue (NE) and Isongo (SE).

scholarly journals Chalk depth structure maps, Central to Eastern North Sea, Denmark

2007 ◽  
Vol 13 ◽  
pp. 9-12 ◽  
Author(s):  
Ole V. Vejbæk ◽  
Torben Bidstrup ◽  
Peter Britze ◽  
Mikael Erlström ◽  
Erik S. Rasmussen ◽  
...  
Keyword(s):  
North Sea ◽  
Upper Cretaceous ◽  
Building Materials ◽  
Oil And Gas ◽  
Rock Type ◽  
The West ◽  
The North ◽  
Groundwater Aquifer ◽  
North Eastern ◽  
Stratigraphic Interval

The Upper Cretaceous – Danian chalk may be considered to be the economically most important rock type in Denmark. Onshore it constitutes an important groundwater aquifer and it is also quarried for e.g. building materials and paper production. Offshore the chalk reservoirs contain more than 80% of the oil and gas produced in Denmark (Fig. 1). During the last few years efforts have therefore been made to map this important succession in the Danish and adjoining areas (Vejbæk et al. 2003). The stratigraphic interval mapped comprises the Chalk Group of Cenomanian to Danian ages and its stratigraphically equivalent units (Fig. 2). The north-eastern limit of the Chalk Group is determined by Neogene erosion. The limits of the map to the west and south were mainly determined by the amount of available data.

scholarly journals International legal standards of advocacy in Russian environmental legislation

2021 ◽  
Vol 244 ◽  
pp. 12005
Author(s):  
Irina Kvach
Keyword(s):  
Oil And Gas ◽  
Legal Regulation ◽  
International Standards ◽  
International Treaties ◽  
National Legislation ◽  
Legal Reforms ◽  
Legal Standards ◽  
The North ◽  
Oil And Gas Fields ◽  
Conceptual Role

The article deals with conceptual questions of the role and place that international standards of advocacy take in the system of sources of advocacy in Russia. The author, relying on the decisions of the Plenum of the Supreme Court of Russian Federation, points out the priority importance of international standards and rules in matters of legal regulation of legal proceedings. Considering a significant array of international documents adopted within the framework of international organizations, including the Council of Europe, the author singles out those containing international standards of advocacy. The study of Russian national legislation through the prism of international standards of advocacy makes it possible to conclude that, as a result of prolonged legal reforms, the main fundamental provisions of national legislation have been brought into line with the requirements of international standards, but work in this direction has not yet been over. As a result, the author points out the conceptual role of international treaties as sources of advocacy. The findings became the basis for further author’s research of international standards, as a legal basis for the regulation of advocacy to protect the rights and freedoms of indigenous peoples of the north in the development of oil and gas fields on their ancestral lands.

CANNING BASIN AND GLOBAL PALAEOZOIC PETROLEUM SYSTEMS—A REVIEW

2005 ◽  
Vol 45 (1) ◽  
pp. 349 ◽  
Author(s):  
G.M. Carlsen ◽  
K. Ameed R. Ghori
Keyword(s):  
North America ◽  
North American ◽  
Oil And Gas ◽  
Oil Fields ◽  
North African ◽  
Canning Basin ◽  
Petroleum Systems ◽  
The North ◽  
Oil And Gas Fields ◽  
Gas Fields

There are more than 131 giant and super-giant oil and gas fields with Palaeozoic source and reservoir that are similar to the Canning Basin. These include Palaeozoic basins of North America, North Africa, and the North Caspian Basin of Kazakhstan and Russia.The productivity of these Palaeozoic petroleum systems depends on timing of generation and preservation of charge. Thick Ordovician, Permian, and Triassic evaporite deposits played a very important role in creating and preserving the North American, north Caspian, and north African giant oil and gas fields, respectively.The Mesozoic–Tertiary charged Palaeozoic systems are typically more productive than the Palaeozoic charged systems as exemplified by the north African basins.The Ordovician sourced and reservoired giant oil fields of the North American Mid-Continent are also highly productive. Within the Canning Basin, Ordovician sourced oil has been recovered on the Barbwire Terrace (in Dodonea–1, Percival–1 and Solanum–1) on the Dampier Terrace (in Edgar Range–1 and Pictor–1) and along the Admiral Bay Fault Zone (in Cudalgarra–1, Great Sandy–1, and Leo–1).The Canning Basin may be the least explored of the known Palaeozoic basins with proven petroleum systems. The Palaeozoic basins of North America are the most explored with 500-wells/10,000 km2 compared to the Canning Basin with only 4-wells/10,000 km2.The presence of five oil fields, numerous oil and gas shows and the well density in the Canning Basin (200 wells in 530,000 km2) suggests that further exploration is warranted. Critical analysis of the distribution of source rock, reservoir, seal, timing of generation versus trap formation and post accumulation modification for each tectonic unit of the Canning Basin is required.

Oil Production Enhancement by EOR Candidates Optimization

2021 ◽  
Author(s):  
Denis Yurievich Pisarev ◽  
Ildar Fanurovich Sharipov ◽  
Artur Michailovich Aslanyan ◽  
Danila Nikolaevich Gulyaev ◽  
Anastasiya Nikolaevna Nikonorova
Keyword(s):  
Oil And Gas ◽  
Thick Layer ◽  
Clay Content ◽  
Oil Production ◽  
Quaternary Period ◽  
The North ◽  
Oil And Gas Fields ◽  
Production History ◽  
Water Cut ◽  
Gas Fields

The study field is located in the Nizhnevartovsk district of the Khanty-Mansi autonomous region. The deposit is located in the Nizhnevartovsk crest zone. The geological section of this deposit features a thick layer (2740-2870 meters) of Meso-Cenozoic era sedimentary rocks starting from the Jurassic period up to and including the Quaternary period, and rests unconformably on the surface of the deposits of the folded Paleozoic basement. The pay zones of study oil and gas fields features mainly sandstone-siltstone reservoirs. The study formation XX11-2 features interleaved rocks with a high clay content. In the west and south-west of the field, the oil-saturated thicknesses vary on average from 5-10 m, and in the north, the thickness increases to 10-20 m. This field has a long-lasting production history as a result of drilling vertical and horizontal wells but is currently at production decline stage. The existing reservoir pressure support system assumes that the water-cut trend at the wells will increase. In recent years, there has been advanced flooding in some areas, resulting in a drop in oil production, while the reasons for the advanced flooding are not always clear. This is often due to the progressing spontaneous fracturing in the injector wells (Aslanyan, Akimov et al., 2020).

Repurposing of Offshore Oil and Gas Cables for Renewable Generation: Feasibility and Conceptual Qualification

2021 ◽  
Author(s):  
Ramy Magdy A. Mahmoud ◽  
Hazem Fayad ◽  
Paul E. Dodds
Keyword(s):  
Wind Farm ◽  
Oil And Gas ◽  
Capital Expenditure ◽  
Wind Farms ◽  
Cost Effective ◽  
Field Testing ◽  
Capital Costs ◽  
The North ◽  
Oil And Gas Fields ◽  
Gas Fields

Abstract Wind farms are expected to be deployed in the North Sea in increasing numbers and at ever greater distances from land, over the coming decades. Many nearby oil and gas fields have reached or are near the end of their lifespans, and their operators are eager to explore innovative ways to reduce decommissioning costs. One possibility would be to repurpose some of their infrastructures for use by wind farms, which would both delay decommissioning and reduce the wind farm capital costs. This paper investigates the potential for repurposing existing submarine power cores in decommissioned oil and gas fields as transmission cables for offshore renewables. Offshore power cables generally have longer lifetimes than are needed to deplete hydrocarbon reservoirs. Cable transmission capacity could be too low to provide the main connection to wind farms, but there is scope to increase capacity or use cables as auxiliary connections. A qualification methodology is proposed to assess whether existing cables might be usefully repurposed. Repurposing cables has an impact on renewable project capital expenditure (CAPEX) and levelised cost of energy (LCOE), it also positively affects decommissioning cost and the environment. The qualification methodology provides a cost-effective initial appraisal prior to field testing.

scholarly journals Effect of Effective Pressure on the Permeability of Rocks Based on Well Testing Results

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2306
Author(s):  
Evgenii Vasilevich Kozhevnikov ◽  
Mikhail Sergeevich Turbakov ◽  
Evgenii Pavlovich Riabokon ◽  
Vladimir Valerevich Poplygin
Keyword(s):  
Oil And Gas ◽  
Oil Fields ◽  
Well Testing ◽  
Effective Pressure ◽  
Field Development ◽  
The North ◽  
Oil And Gas Fields ◽  
Gas Fields ◽  
Perm Region ◽  
Pressure Analysis

During the development of oil and gas fields, the permeability of the reservoirs decreases due to a decrease in reservoir pressure and an increase in effective pressure, as a result of which significant reserves of oil and gas remain in the reservoir. To predict the rate of decrease in oil production rates during field development and to respond quickly, it is necessary to know the law of permeability decrease with an increase in effective pressure. Existing methods for describing the change in the permeability of rocks were analyzed in the paper. Numerical analysis of the results of core studies from previously published papers and the results of field well testing on the examples of the north Perm region oil fields showed that in both cases, regardless of the type of rock and the type of reservoir, the change in permeability can be described by the same equations (exponential and power-law). Obtained equations can be used to predict changes in the permeability of terrigenous reservoirs of the north Perm region oil fields. At the same time, according to the results of well testing, an intensive decrease in permeability is observed with an increase in effective pressure. Analysis of the nature of permeability changes using the Two-Part Hooke’s Model showed that significant irreversible deformations are currently taking place in the formations of the oil fields under consideration. Predicting the change in permeability from effective pressure can allow to optimize the development of oil deposits.

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