Tight Oil in Oil-And-Gas Source Carbonate Deposits' Gas Saturation Zones of Gas-Condensate and Oil-Gas Condensate Fields

Skibitskaya, N. A.; Bolshakov, M.N.; Burkhanova, I.O.; Кузьмин, В. А.; Surnachev, D..

doi:10.2118/182076-ms

Cited by 5 publications

(1 citation statement)

References 8 publications

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“…Precipitation of carbonate minerals can significantly affect the reservoir, elastic-strength and other properties of the rocks. Relation between reservoir properties, productivity of source deposits and carbonate mineralization has been established in a number of studies [8][9][10][11][12][13][14][15]. Therefore, investigation of carbonatization processes is important for both geological sections characterization and for optimization of development technologies.…”

Section: Introductionmentioning

confidence: 99%

Application of the Data on δ13C and δ18O of Carbonates for the Study of Unconventional Reservoirs on the Example of the Bazhenov Source Rocks, Western Siberia, Russia

et al. 2021

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This paper addresses potential application of data on stable carbon and oxygen isotope composition of carbonates for study of organic rich source rocks on the example of the Late Jurassic–Early Cretaceous Bazhenov Formation (West Siberian petroleum basin, Russia). Geochemical studies were conducted for sections located in central (most productive) and peripheral (northern and southern) regions of the Bazhenov Formation distribution area, containing deposits formed under different conditions. We identified key factors impacting stable isotope composition of carbonate minerals and established relation of their isotope composition to the formation conditions. Using a thermodynamic model of carbon and oxygen isotope exchange in the carbonate–water–carbon dioxide system, it is shown that variations in the isotope composition of secondary carbonates are affected by isotopic composition of primary carbonates in sediments and by the isotope exchange reactions with water and carbon dioxide, generated during the source rocks transformation. Our results demonstrate that stable isotope data for carbonates in the Bazhenov Formation together with standard geochemical methods can be efficiently applied to determine sedimentation conditions and secondary alteration processes of oil source rocks.

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Section: Introductionmentioning

confidence: 99%

Application of the Data on δ13C and δ18O of Carbonates for the Study of Unconventional Reservoirs on the Example of the Bazhenov Source Rocks, Western Siberia, Russia

et al. 2021

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Modeling of the development of the Vuktyl field hydrocarbon system in the depletion mode using a bench installation

Skibitskaya

Volkov

Latishev

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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The work substantiates the location of liquid hydrocarbons (LH – oil and retrograde condensate) in the dynamic, filtering part of the capacitive volumes of gas-saturated productive deposits of gas condensate and oil and gas condensate fields (GCF and OGCF). The necessity of the development and bench modeling of the production of LH from gas-saturated deposits of GCF and OGCF in the late stages of field development is shown due to the high geological reserves of LH in them and the need to develop them with the aim of component recovery increasing and extending the life of the fields. The experience of bench modeling on the experimental installation of the life cycle of the oil and gas condensate system of the Vuktyl OGCF for the period of its development on the “depletion” mode is described. On the basis of a highly permeable core model, a simulation of the initial fluid saturation was successfully held which fits the initial state of the reservoir system of the Vuktyl OGCF, including the LC (reservoir oil), and also the current thermobaric state and fluid saturation of the reservoir system were simulated. The total mass of LH (reservoir oil and retrograde condensate) in the reservoir model is determined which can be taken as a basis for calculating the LH extraction rate while carrying out further research on bench modeling of LH production technologies in the late stages of Vuktil field development on the core model created. As a result of the works described above, an oil and gas condensate system was created in a highly permeable bench core model which is the model of depleted to maximum condensation pressure reservoir of Vuktyl OGCF.

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Well Logging Data Interpretation in Oil and Gas Source Rock Sections Based on Complex Petrophysical and Geochemical Analysis Results

Хисамов

Skibitskaya

Коваленко

et al. 2018

Day 1 Mon, October 15, 2018

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The capability to define the content and degree of catagenetic maturity of organic matter (OM) from well logging data and advanced petrophysical and geochemical studies is challenge in petroleum exploration and production. To date, quite reasonably understood interconnected patterns of catagenetic organic matter transformation in carbonate rock-forming organic polymer matrix (OPM) from gas-condensate, oil-gas-condensate and oil reservoirs. These conversion processes (chemical, structural, physicochemical), polymerization, OM polycondensation within the primary (lithogenetic) crystals are resulted in the loss of ionic OPM crystal connections between organic anions and inorganic cations (calcium, magnesium etc.). It leads to crystals degradation, micritization and to the output of a separate OM polycondensed phase called kerogen. Processes of chemical degradation of kerogen (which fills subcapillary pores of micritizied matrix) to asphaltenes, heavy resins (primary reservoir oil components) and then to the light resins, oils and liquid petroleum hydrocarbons initiate and accompany further recrystallization processes such as transformation of micritizied subcapillary matrix to a coarse-grained large pore matrix. In other words, in carbonate oil and gas filled formations the processes of oil generation and sequential conversion of “immature" high-bituminous heavy oil to light traditional “mature" oil are passed simultaneously and are interrelated with the processes of recrystallization of the micritizied carbonate matrix to coarse-grained large-pore matrix. As a result, light and “matured" to liquid hydrocarbons syngenetic oil occur in a large porous, permeable and even highly-permeable reservoir without displacement in the volume of the transforming matrix. The study of the regularities of the interrelated processes of the catagenetic transformation of OM in the terrigenous and terrigenous-carbonate oil-and-gas source matrix requires more attention in connection with the need to develop hard-to-recover hydrocarbon reserves associated with the oil and gas deposits of Western Siberia, Caspian, North Caucasian and Volga-Urals provinces. A set of laboratory core investigations was developed for the purpose of detailed study of both carbonate and siliclastic rocks. Core samples were studied with petrophysical, geochemical, electron-microscopic and physicochemical techniques. Based on the developed approaches relevant correlations between core and well logging parameters were obtained along with designed effective core referencing to logging data. To determine the nature of saturation of pore volumes with reservoir fluids and bituminous components from well logging data a special technique was developed and a corresponding chart was created. The basis of the technique forms data and correlation relationships between relative resistivity factor from well logging and mass content of high molecular bitumen components, relationship between mass content of high molecular components and open porosity, relationship between relative resistivity factor and open porosity and oil and gas bulk saturation. The carried out investigations made it possible to establish the relationship between relative resistivity factor and weight concentrations of high molecular bitumen components at the corresponding stages of oil generation. The number of stages of oil generation and the amount of produced hydrocarbons in oil and gas reservoir volume is defined by the degree of rock matrix heterogeneity formed in the stages of sedimentogenesis and diagenesis, the composition of its organic and inorganic constituents and the nature of the relationship between them. Results allow declaring that transformation processes in oil and gas reservoir do not occur simultaneously at certain depths and thermobaric conditions, but take place focally at the level of micro- and macro-volumes in the source rock section. Such focal points in the oil and gas carbonate sections are characterized by a regular increase in porosity and permeability from periphery to center and by change in oil composition from heavy, high bituminous to light, liquid, and traditional oil. As studies have shown, in the studied oil-source terrigenous formations from the Lower Cretaceous to the Lower Triassic deposits an inverted regularity is appeared. The final result of the studies is a probabilistic forecast of focal zones in a three-dimensional reservoir model along with differential characteristic of rock properties and fluid types as they approach from the periphery to the center of focal points, depending on the degree of development of focal points and on the lithology of the oil-and-gas source formation.

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Tight Oil in Oil-And-Gas Source Carbonate Deposits' Gas Saturation Zones of Gas-Condensate and Oil-Gas Condensate Fields

Cited by 5 publications

References 8 publications

Application of the Data on δ13C and δ18O of Carbonates for the Study of Unconventional Reservoirs on the Example of the Bazhenov Source Rocks, Western Siberia, Russia

Application of the Data on δ13C and δ18O of Carbonates for the Study of Unconventional Reservoirs on the Example of the Bazhenov Source Rocks, Western Siberia, Russia

Modeling of the development of the Vuktyl field hydrocarbon system in the depletion mode using a bench installation

Well Logging Data Interpretation in Oil and Gas Source Rock Sections Based on Complex Petrophysical and Geochemical Analysis Results

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