PRELIMINARY RESULTS OF PALYNOLOGICAL INVESTIGATION OF BOTTOM SEDIMENTS FROM LAKE TURGOYAK (CHELUABINSK REGION, RUSSIA)

73-7

INVESTIGATION BOTTOM SEDIMENTS STRUCTURE IN LAKES WITH THE USE OF THE ACOUSTIC METHOD

56-5

DIATOM COMPLEXES IN THE BOTTOM SEDIMENTS OF TURGOYAK LAKE (CHELYABINSK REGION, RUSSIA)

138-14

Analysis of the composition and properties of heavy oils in situ by Low Field NMR relaxation method

For the analysis of heavy oils, the method of simultaneous measurement of the free induction decay (FID) together with the decay of the echo signal in the Carr-Purcell-Meiboom-Gill (CPMG) pulse program was used. The measurements were carried out on a «Chromatek-Proton 20M» NMR analyzer operating at a frequency of 20 MHz. A special control program was created on the NMR analyzer that automatically tunes and measures the full FID curve, then switches to measuring the decay of the echo amplitude by the CPMG pulse sequence, and then the investigation ends with a joint processing of all the experimental data. This method makes it possible to measure the amplitudes of NMR signals and the relaxation times T2 of protons of heavy oil components in situ, including asphaltenes, without any perturbations in the analyzed system. Under the influence of paramagnetic centers located in asphaltenes, the amplitude-relaxation characteristics of oil protons are divided into 7 groups associated with solid asphaltenes in crystalline and amorphous states, resins with high and low density, aromatic and saturated compounds. The NMR amplitudes of these fractions correlate well with the group composition of heavy oils as determined by gravitational-chromatographic SARA method. The combined FID + CPMG method can be recommended for determining the SARA composition and other properties of oil in situ. The behavior of fractions of heavy oil in the temperature range (-15оС ÷ +60оС) was investigated by SARA-NMR method. For the first time in situ, it has been shown that resins participate in the formation of asphaltenes in a closed volume when the oil is cooled from a stable state at room temperature, and vice versa, asphaltenes are disaggregated by heating with the release of resins. The SARA-NMR method is promising for the on-line monitoring of the production, transportation and processing of heavy oil in real conditions of temperature, pressure and dissolved gases. However, the design of the NMR sensor must be adapted to industrial applications. The possibilities of designing NMR probes on process pipelines of larger diameter than in laboratory instruments can be extended taking into account the procedure proposed for correcting the inhomogeneity of the magnetic field in the probed volume based on the FID signal of the liquid oil fraction

RECONSTRUCTION OF THE PAST CONDITIONS OF IVANOVO REGION USING SUBFOSSIL CLADOCERA ANALYSIS OF LAKE RUBSKOYE

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COSMIC DUST AND MICROMETEORITES IN LAKE SEDIMENTS

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Lithological spectra patterns in the Permian continental stratigraphic records, the East of the Russian plate

© 2020 IOP Publishing Ltd. All rights reserved. Stratigraphic sequences are interrupted cyclic records. Only 5-10% of the stratigraphic record is preserved in continental sediments. The most of the sedimentary history is not recorded in the sections due to the lack of sedimentation or erosion of sediments. Therefore, the lithological data series on continental sections very often represent records of a random process. This paper analyses the spectra of grain size, carbonate content and magnetic susceptibility of three continental sections of the Middle-Upper Permian (the Monastery Ravine and the Kzyl Bairak outcrops on the Volga river bank, the Sheremetievka outcrop on the Kama river bank) to estimate a quantity and a quality of stratigraphic records

PRELIMINARY RESULTS OF PALYNOLOGICAL INVESTIGATION OF BOTTOM SEDIMENTS FROM LAKE TURGOYAK (CHELUABINSK REGION, RUSSIA)

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TGA and DSC investigation of different clay mineral effects on the combustion behavior and kinetics of crude oil from Kazan region, Russia

In this research, the effect of different clay minerals (bentonite, illite and kaolinite) on the combustion behavior and kinetics of crude oils from Kazan region (Russia) was studied using thermogravimetry (TGA) and differential scanning calorimeter (DSC). The ramped temperature experiments were performed at constant heating rates (10, 20 and 30 °C/min) under air atmosphere. In both TGA and DSC experiments, two reaction zones were identified known as low temperature oxidation (LTO) and high temperature oxidation (HTO). The reaction regions, burn-out temperatures, mass loss, heat of reaction and peak temperatures were determined. It was observed that the reaction intervals and the peak temperatures were also affected in the presence of different clay minerals. Kinetic parameters were calculated by Ozawa-Flynn-Wall (OFW), Kissenger-Akahira-Sunouse (KAS) kinetic methods. The addition of different clay minerals reduced the mass loss percentages of the crude oil samples due to the surface area effect. In addition, all clay samples show a good catalytic effect by a significant reduction in activation energy

INVESTIGATION BOTTOM SEDIMENTS STRUCTURE IN LAKES WITH THE USE OF THE ACOUSTIC METHOD

56-5