Geopressure, Reservoir Properties and Advanced Geochemistry Analyses Along Pre-Salt in Santos and Campos Basins: From Oil Fields to Frontier Areas

2019 ◽  
Author(s):  
S. Rostirolla ◽  
M. Mello ◽  
H. Kemna ◽  
W. Peres ◽  
O. Pedrosa ◽  
...  
Keyword(s):  
Oil Fields ◽  
Reservoir Properties

scholarly journals Metallic Composition Analysis of Crude Petroleum from Some Oil Fields in Ghana

2021 ◽  
pp. 19-29
Author(s):  
Robert Wilson ◽  
Calvin Kwesi Gafrey ◽  
George Amoako ◽  
Benjamin Anderson
Keyword(s):  
Chemical Elements ◽  
Earth Metal ◽  
Oil Field ◽  
Oil Fields ◽  
Composition Analysis ◽  
Crude Petroleum ◽  
Reservoir Properties ◽  
Exciting Field ◽  
Nuclear Research Institute ◽  
X Ray

Qualitative and quantitative analyses of chemical elements in crude petroleum using energy-dispersive X-ray fluorescence spectroscopic technique has attracted the attention of scientific world because it is fast, cheap, non-destructive and assurance in quality compared to other methods. Metallic element characterisation of crude petroleum is important in the petrochemical industry because it determines rock reservoir properties, the technology needed for extraction and refinery process, hence an exciting field that calls for research. X-ray fluorescence method was used for metallic composition analysis of four rundown crude petroleum samples (SB-2, SB-4, TB-2 and TB-1) from three oil fields (Saltpond, TEN and Jubilee). It was conducted at the National Nuclear Research Institute of Ghana. Analysis of the four samples concluded that oil field maturity decreases orderly from Saltpond, Jubilee and TEN. Vanadium-nickel ratios for each crude petroleum sample was less than 0.5, indicating that both Saltpond and Tano sedimentary rocks are of marine organic origin. Higher concentration levels of rare earth metal elements (scandium and yttrium) in the Saltpond sedimentary basin compared to Tano sedimentary rock suggest seismic effect of McCarthy Hills on Saltpond Basin. The strong negative correlation between the vanadium-nickel ratio (predictor) and scandium concentration (dependent) among the three oil fields implies that scandium concentration can equally be used to characterise the oil fields just as the vanadium-nickel ratios.

scholarly journals Analysis of reservoir properties and parameters of oil fields suitable for the application of CO2-EOR method

2015 ◽  
Vol 32 (1) ◽  
pp. 33
Author(s):  
Barbara Uliasz-Misiak ◽  
Piotr Kosowski ◽  
Joanna Lewandowska-Śmierzchalska
Keyword(s):  
Oil Fields ◽  
Reservoir Properties ◽  
Co2 Eor

scholarly journals Methodological approach to optimal geological and technological characteristics determining when planning hydraulic fracturing at multilayer facilities

2021 ◽  
pp. 182-191
Author(s):  
V. A. Grishchenko ◽  
◽  
R. U. Rabaev ◽  
I. N. Asylgareev ◽  
V. Sh. Mukhametshin ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Methodological Approach ◽  
Oil Fields ◽  
Hydraulic Fractures ◽  
Reservoir Properties ◽  
Effective Power ◽  
Stage Of Development ◽  
Technological Characteristics ◽  
Specific Loading ◽  
Geological Conditions

The paper considers the issue of increasing the hydraulic fracturing efficiency in a multilayer facility at the final stage of development with an uneven degree of reserves development along the section. Based on the results of the analysis, it was found that the upper layers, which have the worst filtration-reservoir properties, are less developed in comparison with the highly productive lower ones. When hydraulic fracturing was carried out in the upper formations, some of the operations had low success due to the breakthrough of hydraulic fractures into the lower depleted formations. On the basis of the revealed dependencies, the work determined the optimal specific loading of proppant per meter of effective power, depending on the geological conditions, and maps of the prospects for hydraulic fracturing are built. Keywords: oil fields development; hydraulic fracturing; hydraulic fracturing optimization; multilayer facilities.

scholarly journals The key factors controlling reservoir quality of the Middle CambrianDeimena Group sandstone in West Lithuania

2002 ◽  
Vol 49 ◽  
pp. 25-39
Author(s):  
Linas Kilda ◽  
Henrik Friis
Keyword(s):  
Early Stage ◽  
Clay Fraction ◽  
Oil Fields ◽  
Reservoir Quality ◽  
Key Factors ◽  
Reservoir Properties ◽  
Carbonate Cement ◽  
Commercially Important ◽  
Early Carbonate

Sandstones of the Middle Cambrian Deimena Group are commercially important as they make up the largest part of the hydrocarbon-bearing reservoir in 15 oil fields discovered in West Lithuania. However, the sandstones are characterised by a very complicated spatial distribution of reservoir quality. In order to better understand the distribution of reservoir properties and their controlling parameters, eighty-two sandstone samples from twenty-one boreholes were studied by means of thin section description, scanning electron microscopy, using backscattered and cathodoluminescence modes and clay fraction analyses. Generally, the sandstones are strongly cemented by quartz, resulting in almost total destruction of porosity but porous domains with preserved early stage quartz cement occur in a complex pattern. The close location of the early and late stage overgrowth types indicates that some sandstone parts were preserved from intense authigenic quartz precipitation. We believe that early carbonate cement was such an inhibitor. Detrital quartz grains in carbonate cemented domains are mostly free of authigenic quartz and as a rule show weakly compacted fabric as compared to the quartz cemented parts. Moreover, large secondary pores are located close to the carbonate cemented domains and indicate that some carbonate cement eventually dissolved. Apparently, the best reservoir properties within the generally strongly quartz cemented Deimena Groupsandstones are found in domains where dissolution of the early carbonate cement took place.

scholarly journals Improving the carbonate reservoirs development efficiency on the example of the Tournaisian stage deposits

2021 ◽  
pp. 238-247
Author(s):  
V. A. Grishchenko ◽  
◽  
T. V. Pozdnyakova ◽  
B. M. Mukhamadiyev ◽  
V. V. Mukhametshin ◽  
...  
Keyword(s):  
Methodological Approach ◽  
Geological Structure ◽  
Carbonate Reservoirs ◽  
Oil Fields ◽  
Structure Development ◽  
Reservoir Properties ◽  
Development Indicators ◽  
Geological Factors ◽  
Complex Geological Structure ◽  
Development Analysis

The article deals with the issue of carbonate strata of complex geological structure development efficiency improving. Such facilities, as a rule, have deteriorated reservoir properties, parameter anisotropy and are complicated by secondary cavernosity. All of these factors affect the recovery efficiency and are often reflected in development indicators. On the example of Tournaisian stage deposits an example of a methodological approach to the development analysis which takes into consideration various geological factors is presented. As a result, various dependencies were obtained, which when taken into account determin the most promising areas in terms of development efficiency. The issues of the waterflooding system efficiency and the ways of its efficiency increasing are considered separately. Keywords: oil fields development; carbonate reservoirs; development efficiency; waterflooding system.

Subtle oil fields along the Western Flank of the Cooper/Eromanga petroleum system

2015 ◽  
Vol 55 (2) ◽  
pp. 440 ◽  
Author(s):  
Mark Sales ◽  
Malcolm Altmann ◽  
Glen Buick ◽  
Claire Dowling ◽  
John Bourne ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Oil Production ◽  
Oil Fields ◽  
3D Seismic ◽  
Success Rates ◽  
Reservoir Properties ◽  
Seismic Attribute ◽  
Western Flank ◽  
Definition Of ◽  
Market Capitalisation

Oil production from Cooper/Eromanga started in 1978, peaked in the 1980s and began a steady decline. Oil production from the Western Flank commenced in 2002 and has steadily increased. In the year until July 2014, a total of 8.6 million BBL of oil was produced from 16 active fields along the Western Flank, bringing the cumulative total to 24 million BBL. Western Flank oil has underpinned a ten-fold growth in market capitalisation in four listed Australian companies: Beach Energy, Drillsearch Ltd, Senex Energy and Cooper Energy. Two sandstone plays dominate the Western Flank petroleum geology: the Namur Sandstone low-relief structural play and the mid-Birkhead stratigraphic play. The use of 3D seismic has improved the definition of both plays, increased exploration success and optimised field appraisal and development drilling. Success rates have improved despite most Namur structural closures being close to the resolution margin for depth conversions (less than 8 m). Seismic attribute mapping is being refined in the more difficult search for mid-Birkhead stratigraphic traps with recent exploration discoveries indicating improved success. Reservoir properties in the Namur are excellent with multi-Darcy permeability, unlimited aquifer strength, low gas/oil ratio (GOR) and low residual oil saturation. This combination leads to an oil recovery factor greater than 75%. Initial free-flow production rates commonly exceed 6,000 BBL per a day. The mid-Birkhead reservoir is also of high quality but the lack of a strong aquifer drive reduces primary recovery. New and re-processed 3D seismic and water-flood projects are expected to drive further discoveries, reserve and production growth.

CHARACTERISATION OF AUSTRALIA'S OIL FIELDS BY FLUID AND RESERVOIR PROPERTIES AND CONDITIONS

1989 ◽  
Vol 29 (1) ◽  
pp. 287
Author(s):  
S. Miyazaki
Keyword(s):  
Oil Fields ◽  
Oil Reservoirs ◽  
Reservoir Rock ◽  
Reservoir Properties ◽  
Regional Variations ◽  
Average Temperature ◽  
Data Compilation ◽  
Fluid Properties ◽  
Formation Water Salinity ◽  
Gippsland Basin

An extensive data compilation of reservoir rock and fluid properties, and temperature and pressure conditions, in Australia's oil fields, has provided regional information on the nature of crude oil accumulations. It has also allowed the determination of systematic trends and regional variations. These trends and variations are depicted in cross- plots of porosity against depth, porosity against permeability, temperature against depth, pressure against depth, oil gravity against depth, and formation- water salinity against depth.Offshore oil reservoirs, principally based on Gippsland Basin data, are of better quality than onshore ones, even after the porosity cut- off effect is taken into consideration. The Eromanga and Cooper Basins have a higher heat flow than other basins containing oil fields. Pressure trends are consistent with the low salinity nature of formation waters. In Australia, oil reservoirs have an average depth of 1500 m sub- sea and an average temperature of 90°C, and crude oils are light, with an average gravity of 45° API.Interpretation of systematic trends and regional variations can facilitate prospect evaluation by predicting the most likely reservoir qualities and conditions and the fluid properties in potential drilling targets.

scholarly journals Structural and dynamic distribution patterns of oil fields in the central part of the Volga-Ural anteclise

2020 ◽  
Vol 11 (1) ◽  
pp. 123-140
Author(s):  
S. Yu. Kolodyazhny ◽  
A. I. Nekrasov
Keyword(s):  
Structural Data ◽  
Distribution Patterns ◽  
Shear Zones ◽  
Oil Field ◽  
Oil Fields ◽  
Heterogeneous Structure ◽  
Reservoir Properties ◽  
Lateral Direction ◽  
Structural Dynamic

Tectonical and development features of the central part of the Volga-Ural anteclise and the Sura-Kama (SK) shear zone are considered in connection with the distribution patterns of oil fields. Based on the geological and structural data, it is found that the SK zone is a deep fault of a heterogeneous structure, which has signs of the long-term multistage development. At the plate stage, the SK zone developed under kinematic inversion and subsequent transpression and transtension deformations. We propose a model showing that during the transtension stages, deformations in the SK zone contributed to the primary migration of hydrocarbons in the Devonian domanic formations and their secondary redistribution. Within the SK zone, permeability was increased, and the zone itself acted as a concentrator of these formations in local decompression structures. Fault structures in the SK zone closed during the transpression stages; their reservoir properties were decreased; and hydrocarbons were squeezed predominantly in the lateral direction along the reservoirs in the area of dynamic unloading. At the eastern termination of the SK zone, the unique Arlan oil field was formed, wherein hydrocarbons were accumulated in conditions of alternating stresses between the sectors compensating shear displacements at the flanks of the zone. The unique Romashkinsky oil field was formed in the apical part of the South Tatar arch during its long-term uplifting and decompression, which contributed to progressive migration and accumulation of hydrocarbons from the transpression sector of SK zone. The proposed structural-dynamic model and ideas about compression – decompression regularities of hydrocarbon redistribution in the shear zones can be used for prediction and detection of new deposits. In particular, the dynamic analogues of the Arlan oil field in the east part of the SK zone can be found within the poorly studied western flank of this zone.

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