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EAGE/SPE Workshop on Shale Science 2021
- Conference date: April 5-6, 2021
- Location: Moscow, Russia
- Published: 05 April 2021
21 - 28 of 28 results
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The Nature of The Anomalous Seismic Pattern of Reflector B in The Classical Structure of The Bazhenov Formation on The Eastern Framing of The Surgut Arch
Authors M.E. Smirnova, I.V. Panchenko and N.N. GatinaSummaryThis paper discusses one of the variations in the structure of the classical type of section of the Bazhenov Formation, which has a non-standard expression on seismic sections. The geophysical expression of such sections is similar to the pattern inherent in the anomalous sections of the Bazhenov Formation: the negative phase of reflector B expands, the negative phase is locally bifurcated, and an independent lenticular positive reflection appears inside. In the zone of bifurcation of the negative phase of reflector B in the well sections, an increased thickness of the Formation is noted, namely, its upper part of the section - 6th band. With a sufficient thickness of 6th band, a two-modal high-amplitude negative reflection is formed due to the change in acoustic properties, first when passing from the Lower Achimov clays to clay silicites of the 6th band and further to silicites composing bands 1–5. The well data demonstrate that the Bazhenov Formation is laterally sustained within this zone. Changes in thickness are relatively smoothly, according with the structural-tectonic plan of the territory. Such a structure of the Formation is due to the redistribution of sedimentary material of 6th band into accommodation spaces on the slope of the Surgut arch.
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Molecular Dynamics Modeling of Kerogen Chemical Structure
Authors V. Shirokova, A. Zhugayevych and M. SpasennykhSummaryThe work is devoted to the reconstruction of Bazhenov kerogen chemical structure. For this purpose, the 4-step workflow was developed. At the first stage, available experimental data (CHNS analysis, pyrolysis, 13C NMR, XPS) was processed. It provided with kerogen structural parameters: relative amounts of elements, types and amounts of heteroatomic functional groups and carbon forms in the structure under study. At the second stage, 3 potential macrofragments were built, their structural parameters and 13C NMR spectra were calculated and compared to the real one. As a result, the most possible macrofragment was chosen for structure modeling. The third stage was related to the preparations of input data for molecular dynamics simulation software. It included creation of several files, containing description of each atom and force field parameters. At the final stage, the molecular dynamics simulation of several copies of selected macrofragment was run. It provided with the equilibrated kerogen model. As a result, the first data on chemical structure of Bazhenov kerogen was obtained. It is expected to be applied for the calculation of kerogen chemical transformation in geological and technological processes.
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Reservoir Model of the Bazhenov High-Carbon Formation
SummaryThe area of reservoirs distribution is controlled by depositional environment of radiolarites, phosphates and biogenic carbonates, as well as the degree of catagenetic transformation, which determines the formation of secondary porosity. The largest pore sizes and the best connectivity in the BHCF are found in reservoirs of the pore-microcavernous type in siliceous and carbonate-siliceous radiolarites at the early and middle stages of catagenesis. At the stages of middle and late catagenesis, pore reservoirs also begin to form in phosphate rocks. The kerogen porosity also makes a large contribution to the volume of void space in late catagenesis. The porosity of already existing siliceous reservoirs increases due to the appearance of pores in kerogen, as well reservoirs in kerogen-rich matrix rocks appear. Reservoirs of fractured and fractured-cavernous type are formed under the influence of hydrothermal fluids and are found in rocks, the transformation of which corresponds to middle mesocatagenesis and higher the stages. Thus, it was shown that the reservoirs in the sections thicken with an increase of catagenetic transformation degree due to the appearance of additional elements of the void space in rocks with different composition that compose the BHCF.
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Compound-Specific Stable Isotope Composition of Hydrocarbons as a Tool in Petroleum Exploration
More LessSummaryCompound-specific isotope analysis (CSIA) of individual hydrocarbons is a powerful tool in petroleum exploration. When integrated with other organic geochemical methodologies it can provide evidence of fluid histories including source, maturity, charge history and reservoir processes that can support field development planning and exploration efforts. The purpose of this presentation is to provide a review of the methodology used for generating carbon and hydrogen isotope data for petroleum hydrocarbons. The talk will cover the key factors that control stable carbon and hydrogen isotope compositions of n-alkanes and related compounds in sedimentary and petroleum systems and review current and future applications of this methodology for petroleum exploration. In addition, the presentation will give examples of basin specific case studies that demonstrate the usefulness of CSIA when addressing either particular aspects of petroleum exploration (e.g., charge evaluation, source rock-oil correlation, and investigation of maturity and in-reservoir processes) or when this technique is used to corroborate interpretations from integrated petroleum systems analysis, providing unique insights, which may not be revealed when using other methods. CSIA of petroleum hydrocarbons can provide crucial data to strengthen petroleum systems concepts from generation and expulsion of fluids from source rock, to charge history, connectivity, and in-reservoir processes.
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Pyrite Morphology and Sulfur Isotope Composition in The Bazhenov Formation of West Siberia
Authors E. Idrisova, T. Karamov, A. Voropaev, R. Gabitov, N. Bogdanovich and M. SpasennykhSummaryPyrite morphology and sulfur isotope composition may serve as indicators of redox conditions changes during sedimentation process. Redox conditions, in turn, affect the accumulation and transformation of organic matter in the rocks. Pyrite morphology was studied with scanning electron microscopy (SEM). Sulfur isotope composition was measured with two methods: isotope ratio mass spectrometry (IRMS) and secondary isotope ratio mass spectrometry (SIMS). The studied rock samples of the Bazhenov Formation contain various pyrite types: small (5–10 μm) and large (10–30 μm ) framboids, fine-crystalline (1–2 μm) aggregates and large euhedral crystals (20–50 μm). Small framboids and fine-crystalline pyrite have isotopically light sulfur, δ34S varies in the range from -55 to -20 ‰ CDT. Large framboids and large idiomorphic crystals contain more isotopically heavy sulfur (up to 25 ‰ CDT). The abundance of small framboids indicates anoxic or euxinic sedimentation conditions that control OM’s accumulation and preservation. Large framboids and large pyrite crystals in the sediments indicate the suboxic conditions of sedimentation and possible oxidation of OM during early diagenesis.
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Comparison of The Pore Space Transformation and Newly Generated Hydrocarbons Composition in Result of Thermal Heating of Domanic and Bazhenov Rock Formations
Authors D. Gafurova, A. Kalmykov, D. Korost, M. Tikhonova, O. Vidishcheva, A. Bychkov and G. KalmykovSummaryThis paper presents the results of organic matter transformation in the rocks of the Jurassic high-carbon formation and Domanik high-carbon formation study. The uniqueness of these deposits lies in the fact that they are both a proven highly productive oil source stratum and can contain a significant amount of hydrocarbons that have not yet been emigrated and / or generated. This gives the right to consider these deposits as a single non-structural hydrocarbon reservoir, from which part of the hydrocarbons left and migrated into structural traps, and part remained and represents undiscovered hydrocarbon resources. The main problem in such rocks is the difficulty of extracting hydrocarbons, they are located in a low porous matrix. In addition, the organic matter itself acts as a sorbent and hinders their emigration. Also, hydrocarbons can be found in closed and sealed pores. Investigation of the transformation of organic matter, pore space and the composition of released synthetic hydrocarbon compounds in high-carbon rocks in the future may contribute to the selection of optimal technologies for the development of unconventional oil and gas reservoirs.
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Practical Application of Chemostratigraphy and Lithochemistry Methods in The Study of Oil Bearing Black Shale
Authors I. Panchenko, P. Kulikov and R. GaripovSummaryMost of the well-known oil-bearing black shales are united by the fact that they contain abnormally high contents of a number of chemical elements (U, S, Fe, Mg, P, Cu, Zn, Mo, V, Ni, Ba, As, etc.). The study of variations in the content and ratios of these elements makes it possible to obtain an increase in geological data on the genesis and properties of rocks. The paper shows how the application of the methods of lithochemistry and chemostratigraphy makes it possible to detail the sectional layering and identify promising hydrocarbon intervals in them. On the examples of the siliceous Bazhenov Formation of Western Siberia, the carbonate Domanic Formations of the Russian Plate and the Kuma Formation of the Ciscaucasia, and clayey Khadum Formation of the Ciscaucasia, the most informative modular chemical parameters are shown for the analysis of carbonate content ((Ca+Mg)/Al, Sr/Ca, Mg/Ca) and clay content (Mg/Ca, (Al+K)/(Ca+Mg+Si), Zr/Al) of the section, terrigenous material input (Zr/Al, Si/Al, Ba/Al, S/(Rb+Zr)), bioproductivity (P/Al, Mo/Al, S/(Rb+Zr), Si/Al) and fluctuations of anoxic events (Mo/Mn, Mn/Al) in the paleobasin.
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Assessment of The Hydrocarbon Potential of The Domanik Deposits of The TPP on The Basis of Quantitative Models of Generation and Assessment of The Saturation of The Pore Space
Authors O. M. Prischepa, Yu. V. Nefedov and A. H. IbatullinSummaryOne of the discussed issues concerning the development of the resource base of hydrocarbons in recent years is the study of ways of involving in the development of industrial clusters associated with high carbon shale complexes that are widespread in Russia. Interest in them is supported by the system of benefits provided by the Government of the Russian Federation for low-permeability strata and special preferential conditions for conducting geological exploration provided in recent years. An important effect was also achieved by the development of a methodology for estimating reserves and placing on the state balance of reserves of a group of fields with oil deposits in the domanik deposits of the Volga-Ural OGP. This assessment of potential carbon formations of the Russian Federation continues to be a subject of scientific research without an application component, because of its inapplicability to select as the most important areas for exploration and possibilities of use in the study of investments. The uncertainty is related to the assessment of possible production levels with an unclear correlation between development technologies, filtration and reservoir properties, and the potential of high-carbon strata. There are several approaches to assessing the resources of hydrocarbon accumulations confined to low-pore and low-permeable strata of oil and gas source formations. In this study, we discuss two approaches that allowed us to assess the potential of the main high-carbon strata common in Russia.
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