scholarly journals The role of concentrations variability of organic matter in kerogenic shale defluidisation on the catagenic depths

2021 ◽  
pp. 75-84
Author(s):  
I. F. Yusupova ◽  
Keyword(s):  
Organic Matter ◽  
Oil Shale ◽  
Terrigenous Material ◽  
High Carbon ◽  
Shrinkage Cracks ◽  
Liquid Products ◽  
Increased Strength ◽  
The Baltic ◽  
Reduced Density

The Baltic kerogenic shale – kukersites (О2kk) were considered high-carbon marls which consist of three rock-forming components: organic matter (kerogen), carbonates and terrigenous material. As example used are data of the other high-carbon rocks. It is shown that increased concentrations of organic matter predetermine a number of features of these rocks (reduced density, reduced strength, etc.). The concentrations variability of the organic matter makes conditions the heterogeneity of the intraformational space, the anisotropy of many parameters, as well as the manifestation unevenness of the fluid-generation and evacuation capabilities. It was found that in kukersite shales fluid-generating properties can appear at the earliest stages of catagenesis. The role of areas with the maximum qualities of organic matter in the defluidisation of the shale coals is emphasized: here the more intensive generation of gas-liquid products and increased strength contribute to the earlier formation of drainage microcracks and fluid fractures. The appearance of shrinkage cracks due to catagenic losses of organic matter and usually uneven volume contraction and due to fluidgenerating shale coals is substantiated. The possibility of fluid-generating shale coals losing it lithological individuality during of it defluidisation is found out. Keywords: organic matter; oil shale; kukersite; defluidization; catagenesis; hydrocarbons.

scholarly journals Semi-coking of oil shale of the Leningrad deposit

2021 ◽  
Vol 266 ◽  
pp. 02004
Author(s):  
I.V. Litin ◽  
M.Yu. Nazarenko ◽  
S.N. Saltykova
Keyword(s):  
Oil Shale ◽  
Chemical Properties ◽  
Solid Fuels ◽  
Low Grade ◽  
Baltic Basin ◽  
Influence Of Process Parameters ◽  
The Baltic ◽  
Physical And Chemical ◽  
Near Future

Recently, there has been a growing global interest in processing low-grade types of solid fuels, such as oil shale. In the near future, the role of solid fuels in the country's fuel and energy balance is expected to increase, primarily due to their large reserves. Based on this, this work evaluates the semi – coke obtained by semi-coking low-grade types of solid combustible fossils-oil shale of the Baltic basin (Leningrad deposit). The influence of process parameters (temperature and holding time) on the physical and chemical properties of shale semi-coke was studied experimentally. Based on the data obtained, it is concluded that the obtained samples of semi-coke from oil shale and brown coal can be used as a substitute for coke in various industries and the national economy.

scholarly journals Characterization and thermogravimetric analysis of oil shale from Uvurjargalant deposit

2018 ◽  
Vol 19 (45) ◽  
pp. 19-23
Author(s):  
Khulan Bayasgalan ◽  
Myagmargerel Bayanmunkh ◽  
Ulzii Baatar ◽  
Bolormaa Bayarkhuu ◽  
Tuya Murneren
Keyword(s):  
Organic Matter ◽  
Spectral Analysis ◽  
Thermogravimetric Analysis ◽  
Oil Shale ◽  
Volatile Products ◽  
Liquid Products

The yield, properties and composition of soluble and insoluble (kerogen) of organic matter of oil shale from Uvurjargalant deposit of Mongolia have been investigated in this study. The study result shows that oil shale contains low amount of moisture and volatile products, while the ash yield is high (71.86 %) - which implies that most of the oil shale are minerals. The total amount of bitumens in the oil shale was very low (1.27 wt %), whereas kerogen content was 22.84 wt %, which is relatively high compared to oil shale from other deposits in Mongolia. Under IR spectral analysis and the ratio of hydrogen and carbon, the Uvurjargalant oil shale belongs to I type of oil shale. The thermogravimetric analysis showed that organic matter of oil shale decomposed at a temperature 300-750 ºC to produce gas and liquid products.

scholarly journals Baltic Earth Assessment Report on the biogeochemistry of the Baltic Sea

2021 ◽  
Author(s):  
Karol Kuliński ◽  
Gregor Rehder ◽  
Eero Asmala ◽  
Alena Bartosova ◽  
Jacob Carstensen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Baltic Sea ◽  
Oxygen Availability ◽  
Anthropogenic Pressure ◽  
Nutrient Loads ◽  
The Baltic Sea ◽  
Organic Matter Production ◽  
Matter Production ◽  
The Baltic

Abstract. Location, specific topography and hydrographic setting together with climate change and strong anthropogenic pressure are the main factors shaping the biogeochemical functioning and thus also the ecological status of the Baltic Sea. The recent decades have brought significant changes in the Baltic Sea. First, the rising nutrient loads from land in the second half of the 20th century led to eutrophication and spreading of hypoxic and anoxic areas, for which permanent stratification of the water column and limited ventilation of deep water layers made favourable conditions. Since the 1980s the nutrient loads to the Baltic Sea have been continuously decreasing. This, however, has so far not resulted in significant improvements in oxygen availability in the deep regions, which has revealed a slow response time of the system to the reduction of the land-derived nutrient loads. Responsible for that is the low burial efficiency of phosphorus at anoxic conditions and its remobilization from sediments when conditions change from oxic to anoxic. This results in a stoichiometric excess of phosphorus available for organic matter production, which promotes the growth of N2-fixing cyanobacteria and in turn supports eutrophication. This assessment reviews the available and published knowledge on the biogeochemical functioning of the Baltic Sea. In its content, the paper covers the aspects related to changes in carbon, nitrogen and phosphorus (C, N and P) external loads, their transformations in the coastal zone, changes in organic matter production (eutrophication) and remineralization (oxygen availability), and the role of sediments in burial and turnover of C, N and P. In addition to that, this paper focuses also on changes in the marine CO2 system, structure and functioning of the microbial community and the role of contaminants for biogeochemical processes. This comprehensive assessment allowed also for identifying knowledge gaps and future research needs in the field of marine biogeochemistry in the Baltic Sea.

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