Evaluation of indices and of models applied to the prediction of the stability of crude oils

2010 ◽  
Vol 74 (1-2) ◽  
pp. 77-87 ◽  
Author(s):  
L.G.M. Moura ◽  
M.F.P. Santos ◽  
E.L. Zilio ◽  
M.P. Rolemberg ◽  
A.C.S. Ramos
Keyword(s):  
Crude Oils ◽  
The Stability

Factors affecting the stability of crude oils of 16 varieties of peanuts

1953 ◽  
Vol 30 (7) ◽  
pp. 298-301 ◽  
Author(s):  
Sara P. Fore ◽  
Nelle J. Morris ◽  
C. H. Mack ◽  
A. F. Freeman ◽  
W. G. Bickford
Keyword(s):  
Crude Oils ◽  
Factors Affecting ◽  
The Stability

scholarly journals The geochemical characteristics of Tazhong crude oils from the Tarim Basin, northwestern China

2017 ◽  
Vol 36 (4) ◽  
pp. 764-786 ◽  
Author(s):  
Yungan Liang ◽  
Jianbing Xu ◽  
Wenwen Li ◽  
Bin Cheng ◽  
Qian Deng ◽  
...  
Keyword(s):  
Fault Zone ◽  
Ring Structure ◽  
Geochemical Characteristics ◽  
Crude Oils ◽  
Geochemical Parameters ◽  
Deep Layers ◽  
Methyl Cyclohexane ◽  
Geochemical Analyses ◽  
The Stability

Recent exploration work in the Tazhong district has gradually transferred to the exploitation of high and over mature oils in deep and ultra-deep layers. This has proved problematic, however, as the distribution of crude oils in the Tazhong is complex. This means that the geochemical characterization of high and over mature oils, especially for light crude oils, have become increasingly important. The stability of concerted ring structure of aromatics makes them having stronger thermal stability and resistance to biodegradation. This means that there are abundant aromatic compounds in high and over mature oils. This study presents a series of geochemical analyses of the maturity parameters of 89 crude oils from the Tazhong area, including stable carbon and hydrogen isotope analyses of compounds from 43 light crude oils. These analyses are then compared with other data from the Tazhong Number I fault zone, as well as the Tazhong Number 10 and Tazhong Uplift structural zones. Results show that the geochemical parameters of oils from Tazhong Number I fault zone generally encompass a wider range than those from the Tazhong Number 10 structural zone, which indicates that the Tazhong Number I slope belt is more active than its counterpart structural belt and generates oils with more complex geochemical characteristics. The positive correlation between the toluene/methyl cyclohexane ratio and the dibenzothiophene/phenanthrene ratio, as well as with the naphthalene/phenanthrene ratio indicates that aromatization parameters can be used to evaluate the maturity of light crude oils, and there may be inherited relationships between toluene and methyl cyclohexane in crude oils.

Towards a new method of geochemical kinetic modelling:implications for the stability of crude oils

1998 ◽  
Vol 28 (9-10) ◽  
pp. 597-612 ◽  
Author(s):  
Florent Dominé ◽  
Daniel Dessort ◽  
Olivier Brévart
Keyword(s):  
New Method ◽  
Crude Oils ◽  
The Stability

Properties of Resins Extracted from Boscan Crude Oil and Their Effect on the Stability of Asphaltenes in Boscan and Hamaca Crude Oils

1999 ◽  
Vol 13 (2) ◽  
pp. 309-314 ◽  
Author(s):  
Norman F. Carnahan ◽  
Jean-Louis Salager ◽  
Raquel Antón ◽  
Antonio Dávila
Keyword(s):  
Crude Oil ◽  
Crude Oils ◽  
The Stability

Open discussion

1982 ◽  
Vol 99 ◽  
pp. 605-613
Author(s):  
P. S. Conti
Keyword(s):  
Buenos Aires ◽  
Large Mass ◽  
List Type ◽  
Common Phenomenon ◽  
Open Discussion ◽  
The Stability ◽  
Ring Nebulae

Conti: One of the main conclusions of the Wolf-Rayet symposium in Buenos Aires was that Wolf-Rayet stars are evolutionary products of massive objects. Some questions:–Do hot helium-rich stars, that are not Wolf-Rayet stars, exist?–What about the stability of helium rich stars of large mass? We know a helium rich star of ∼40 MO. Has the stability something to do with the wind?–Ring nebulae and bubbles : this seems to be a much more common phenomenon than we thought of some years age.–What is the origin of the subtypes? This is important to find a possible matching of scenarios to subtypes.

Symmetric Multistep Methods Revisited: II. Numerical Experiments

1999 ◽  
Vol 173 ◽  
pp. 309-314 ◽  
Author(s):  
T. Fukushima
Keyword(s):  
Multistep Methods ◽  
Computational Time ◽  
Integration Time ◽  
Implicit Methods ◽  
Symmetric Methods ◽  
Celestial Bodies ◽  
The Stability ◽  
Predictor Corrector ◽  
Symmetric Multistep Methods ◽  
Integration Errors

AbstractBy using the stability condition and general formulas developed by Fukushima (1998 = Paper I) we discovered that, just as in the case of the explicit symmetric multistep methods (Quinlan and Tremaine, 1990), when integrating orbital motions of celestial bodies, the implicit symmetric multistep methods used in the predictor-corrector manner lead to integration errors in position which grow linearly with the integration time if the stepsizes adopted are sufficiently small and if the number of corrections is sufficiently large, say two or three. We confirmed also that the symmetric methods (explicit or implicit) would produce the stepsize-dependent instabilities/resonances, which was discovered by A. Toomre in 1991 and confirmed by G.D. Quinlan for some high order explicit methods. Although the implicit methods require twice or more computational time for the same stepsize than the explicit symmetric ones do, they seem to be preferable since they reduce these undesirable features significantly.

Uniformity of Magnification from Different Electron Microscopes

1967 ◽  
Vol 25 ◽  
pp. 32-33
Author(s):  
Godfrey C. Hoskins ◽  
V. Williams ◽  
V. Allison
Keyword(s):  
Diffraction Grating ◽  
The Other ◽  
Carbon Replica ◽  
Electron Microscopes ◽  
The Stability

The method demonstrated is an adaptation of a proven procedure for accurately determining the magnification of light photomicrographs. Because of the stability of modern electrical lenses, the method is shown to be directly applicable for providing precise reproducibility of magnification in various models of electron microscopes.A readily recognizable area of a carbon replica of a crossed-line diffraction grating is used as a standard. The same area of the standard was photographed in Phillips EM 200, Hitachi HU-11B2, and RCA EMU 3F electron microscopes at taps representative of the range of magnification of each. Negatives from one microscope were selected as guides and printed at convenient magnifications; then negatives from each of the other microscopes were projected to register with these prints. By deferring measurement to the print rather than comparing negatives, correspondence of magnification of the specimen in the three microscopes could be brought to within 2%.

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