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Search Results: 1 - 10 of 11213 matches for " oil source "
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Hydrocarbon Potential of Two Coastal Basins (Cameroon)  [PDF]
Jean Jacques Nguimbous-Kouoh, Jacques Tchutchoua, Simon Ngos III, Theophile Ndougsa Mbarga, Eliezer Manguelle-Dicoum
International Journal of Geosciences (IJG) , 2018, DOI: 10.4236/ijg.2018.92009
The problem related to the occurrence of oil accumulations in a sedimentary basin requires knowledge of the different geological structures present in this basin. The aim of this article is to show that the geological structure of sedimentary basins has an impact on the generation of oil accumulations. The case of Cameroon’s coastal basins has been studied: the Douala/Kribi-Campo basin (DKC) and the Rio Del Rey basin (RDR), which are producing basins in Cameroon. The work carried out has enabled to classify the DKC and RDR basins as passive margin basins. The lithology and geological structures present in the Douala/Kribi-Campo basin suggest the existence of source rocks (RM-1, RM-2, RM-3, RM-4 and RM-5), seal rocks (Mundeck clay, Logbabaclay...), stratigraphic, structural and mixed traps; the best oil potential is identified in its eastern part. On the other hand, the sandy levels are abundant, clean, and thick with a great porosity, which makes them excellent hydrocarbon reservoirs. In the Rio Del Rey basin, the lithology and geological structures present suggest the occurrence of source rocks (Akata clay and Agbada base clay), seal rocks (Akata clay) and multilayered reservoir rocks sandy or silty Agbada Formation and the freshwater sands of the Benin Formation. Unlike the Douala/Kribi-Campo basin, the best oil potential in the Rio Del Rey Basin lies in the center, in the so-called “deltaic alternation” formations dated from the late Miocene to the Pliocene.
Total Organic Carbon Enrichment and Source Rock Evaluation of the Lower Miocene Rocks Based on Well Logs: October Oil Field, Gulf of Suez-Egypt  [PDF]
Aref Lashin, Saad Mogren
International Journal of Geosciences (IJG) , 2012, DOI: 10.4236/ijg.2012.34069
Abstract: October oil field is one of the largest hydrocarbon-bearing fields which produces oil from the sand section of the Lower Miocene Asl Formation. Two marl (Asl Marl) and shale (Hawara Formation) sections of possible source enrichment are detected above and below this oil sand section, respectively. This study aims to identify the content of the total organic carbon based on the density log and a combination technique of the resistivity and porosity logs (Δlog R Technique). The available geochemical analyses are used to calibrate the constants of the TOC and the level of maturity (LOM) used in the (Δlog R Technique). The geochemical-based LOM is found as 9.0 and the calibrated constants of the Asl Marl and Hawara Formation are found as 11.68, 3.88 and 8.77, 2.80, respectively. Fair to good TOC% content values (0.88 to 1.85) were recorded for Asl Marl section in the majority of the studied wells, while less than 0.5% is recorded for the Hawara Formation. The lateral distribution maps show that most of the TOC% enrichments are concentrated at central and eastern parts of the study area, providing a good source for the hydrocarbons encountered in the underlying Asl Sand section.
CT&F - Ciencia, Tecnología y Futuro , 1997,
Abstract: the chemical composition of 25 crude oils from tertiary reservoirs and 12 rock extracts from five organic-rich cretaceous formations in the middle magdalena basin, colombia were studied in detail by geochemical methods in order to understand their genetic relationships. the oils have been geochemically classified into four main groups based on the sulfur content, pristane/phytane, dibenzothiophene/phenanthrene, concentrations of oleanane and terpane distributions. each group occur in different geographic locations. oils were mainly derived from calcareous, siliciclastic and mixture of these two fades of the upper cretaceous la luna formation. source-oil correlation is supported bysterane and terpane distributions of and carbon isotope ratios. some oils in the eastern margin contain relatively higher concentrations of higher plant indicators than the remaining oil samples. the molecular compositions of the oils observed in this study appear to be consistent with the inferred depositional sequence of anoxic marine/pelagic carbonate fades in the north/western sector of the middle magdalena, while the eastern sector received a higher proportion of clastic input. this documentation supports the interpretation that the middle magdalena oils have been generated "locally", as opposed to have migrated from the region of the eastern cordillera. biomarker maturity parameters indicate that the majority of oils were generated in the early thermal maturity oil window except the colorado-38 oil which was generated in the middle thermal maturity oil window. oil maturity data also supports the short migration distances of oils from the early-mature source rocks to the reservoir rocks. the composition of some oils (e.g., la cira, infantas, conde and bonanza) is unusual in that gas chromatographic data contains an n-alkane and isoprenoid distribution normally associated with moderately degraded oils, but they also contain a relatively high abundance of gasoline hydrocarbons. this part
Effect of oils sources on blood lipid parameters of commercial laying hens
Murata, LS;Ariki, J;Machado, CR;Silva, L da PG da;Rezende, MJM;
Revista Brasileira de Ciência Avícola , 2003, DOI: 10.1590/S1516-635X2003000300008
Abstract: the experiment was carried out to verify if total cholesterol, hdl-cholesterol and triacylglicerol plasma levels are affected when laying hens are fed rations containing different dietary oil sources. one hundred sixty 50 week-old hens, assigned to four treatments with five replicates using 8 hens per replicate were used. the experimental period was of 84 days divided in 3 cycles of 28 days each. in the last day of each cycle, blood samples of 2 hens per replicate were randomly choose and blood samples were collected. on the other hand, blood was also collected at 7 am, 11 am and 3 pm aiming to study the daily changes of these lipids. blood lipid parameters were not affected by different dietary oil sources (p > 0.05); however, hdl-cholesterol did change during the day, giving evidence that this lipid is indeed involved in the egg yolk formation.
Source Rock Prediction Value: world provinces during Late Jurassic–earliest Cretaceous times and position of West Carpathians in SRPV prediction
Annales Societatis Geologorum Poloniae , 2009,
Abstract: Thirty-six Late Jurassic–Early Cretaceous regions were evaluated to obtain the Source Rocks Predic- tion Value (SRPV). We focused on three major processes, which control the organic richness in a specific paleogeographic, climatic and tectonic setting. These three processes are biologic productivity, background sedimentation rates with non-dilution of organic richness by clastic sedimentation, and preservation of organic matter. A high or increased level of primary biologic productivity supports an increased flux of organic carbon to the sediments of the sea floor. When sedimentation rate increases, especially of fine-grained sediment, the organic matter content of the sediment also increases. Preservation of organic matter depends on domination of anoxic conditions during periods of stagnation of Carpathian basins. The debate over which of the three primary pro- cesses is the most important control on the accumulation of organic-rich facies is inconclusive. We assume that the three processes are equally important, and that the balance between them has the overriding control. The amount and richness of organic matter buried in marine sediments then depends on the balance between production and destruction, where the latter includes consumption, decomposition, and dilution. The modeling of the Source Rocks Prediction Value has placed the marginal Tethyan Ocean (Carpathian basin) among the basins, which contain the richest Late Jurassic–Early Cretaceous source rocks in the world. Using the semi-quantitative Delphi method for 36 Late Jurassic regions, which represents a single tectono-depositional province in this time, we evaluated the assessment of SRPV for each of these. The south-Caspian and Central Asia basin was ranked eighth, while the Carpathian basin ninth. The paleogeographic and paleoclimatic settings are indicated as main factors in distribution by basins of known organic-rich rocks. The high organic productivity of the Carpathian basins was caused by upwelling, as well as restricted conditions in the narrow rift basins. The Upper Jurassic organic-rich Mikulov marls representing world-class source rocks (in the southeastern Czech Republic and north-eastern Austria) and Upper Jurassic–lowermost Cretaceous Vendryně Formation rocks were used as local example in analysis of oil source deposits within West Carpathian arc. The average measured Source Potential Index (SPI) for both investigated Upper Jurassic organic rich formations is around 10 and this value fits very well the SPI pre- dicted for Carpathian Upper Jurassic using Source Rocks Predicti
Effect of oils sources on blood lipid parameters of commercial laying hens
Murata LS,Ariki J,Machado CR,Silva L da PG da
Revista Brasileira de Ciência Avícola , 2003,
Abstract: The experiment was carried out to verify if total cholesterol, HDL-cholesterol and triacylglicerol plasma levels are affected when laying hens are fed rations containing different dietary oil sources. One hundred sixty 50 week-old hens, assigned to four treatments with five replicates using 8 hens per replicate were used. The experimental period was of 84 days divided in 3 cycles of 28 days each. In the last day of each cycle, blood samples of 2 hens per replicate were randomly choose and blood samples were collected. On the other hand, blood was also collected at 7 am, 11 am and 3 pm aiming to study the daily changes of these lipids. Blood lipid parameters were not affected by different dietary oil sources (p > 0.05); however, HDL-cholesterol did change during the day, giving evidence that this lipid is indeed involved in the egg yolk formation.
A comprehensive review concerning the problem of marine crudes sources in Tarim Basin
Zhaoming Wang,Zhongyao Xiao
Chinese Science Bulletin , 2004, DOI: 10.1007/BF02890447
Abstract: The issue of source of oil/gas in the platform basin area in Tarim Basin has been debated for a long time, and the debate is focused on whether the marine oil/gas resources that have been discovered in the basin were originated from hydrocarbon source rocks in the Cambrian-Lower Ordovician or in the Mid-Upper Ordovician. In this paper a summary was made in regard to the major points and supporting data by the predecessors, and a discussion was conducted toward the core issues related to the study on the oil source in the Tarim Basin area, such as choice of correlation parameters, influence of maturation and physical differentiation on oil source correlation parameters, and geological and geochemical significance of these relevant correlation indices. It is quite probable that different interpretation results could arise from the oil source correlation due to choice of parameters severely affected by the thermal maturation and physical differentiation effect, and insisted that only those parameters that come with clearly defined geochemical significance and are less affected by thermal maturation and variations occurring during secondary evolution process are valid ones. The marine crude in Tarim Basin covers contributions that were originated from two sets of hydrocarbon source rocks as mentioned above but dominated by the one from the Mid-Upper Ordovician hydrocarbon source rocks. Here oil of mixed sources occurs extensively, and crude from Cambrian sources was also discovered. It is suggested that for further study on the origin of marine crudes in Tarim Basin, the parameters used for correlation of oil sources shall be optimized, and a comprehensive set of geological and geochemical methods shall be adopted for this purpose.
Philosophical Thinking of Petroleum Generation

陈星州, 陈振岩, 李军生
Advances in Geosciences (AG) , 2014, DOI: 10.12677/AG.2014.41005
This paper puts forward an argument of generating new hydrocarbon resources by heating up source rock based on investigations and researches on theories of hydrocarbon generation, the real cases of exploration and development, as well as the trend of technical development. Practices in oil and gas exploration and development through years have demonstrated that a huge amount of good hydrocarbon source rocks exist in the formations; the modern theory of hydrocarbon generation believes that the process of kerogen degradation and hydrocarbon generation involves two factors, temperature and time, which are complementary, i.e. if the temperature is very high, it is possible to generate oil and gas even though the time is short; in the history of oil and gas exploration, magmatic rocks have been found to be numerous in the formations, and such rocks possess heat effect which can accelerate the maturation and hydrocarbon generation process of source rock in adjacent formation; simulation experiments indicate that source rock can generate oil and gas rapidly under higher temperature. Many thermal recovery techniques of heating up formations have been applied such as cyclic steam stimulation, steam flood and in situ combustion. In the recovery of oil shale, three types of heating technologies are employed including heat conduction, heat convection and heat radiation. These researches and surveys have provided a technical imaginary space for generating hydrocarbon by heating up source rock. It is believed through above researches that it is theoretically, practically and technically feasible to generate oil and gas through heating up source rock. Technologies are
Rangel,Antonio; Hernández,Roberto;
CT&F - Ciencia, Tecnología y Futuro , 2007,
Abstract: a thermal model integrated with an oil and gas geochemical study has been constructed for the catatumbo basin, colombia to provide petroleum system data for hydrocarbon exploration. the calibration of the thermal model with maturity data took into account a changing heat flow scheme which included a thermal increase towards the end of the jurassic and another one in the early eocene, associated with rifting events. locally, active/generating source rocks are within the synclines axes. the hydrocarbon expulsion time for cretaceous source rocks (capacho and la luna formations) started in the upper paleocene-eocene, while for the los cuervos formation the generation and expulsion started at 10 my. the petroleum expelled during the paleocene-miocene, were likely accumulated in structures formed since the end of the cretaceous, while the younger structures that resulted from the andean orogen were charged by remigration from the older structures and additionally with the yougest lately generated hydrocarbons. the accumulations of hydrocarbons are mainly the result of generation and migration locally within the basin. the catatumbo basin contains thermogenic wet gases with different degrees of thermal maturity which varies from around 1,0 to 2,5 equivalent ro. the highest degree of thermal evolution according to maturity indicators and thermal modeling is in the southern area, which is prospective for wet gas. the central and northern area appears more prospective for oil with minor amounts of gas.
25-norhopane series in the unbiodegraded oil and the source rocks
Jianping Bao
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882874
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