scholarly journals On the nature of Paleozoic oil deposits and their exploratory "reflection" in the geophysical section of the Jurassic layers (southeast of Western Siberia)

2021 ◽  
Vol 43 (1) ◽  
pp. 93-128
Author(s):  
V.I. Isaev ◽  
A.O. Aleeva ◽  
G.A. Lobova ◽  
O.S. Isaeva ◽  
V.I. Starostenko
Keyword(s):  
Electrical Resistivity ◽  
Oil And Gas ◽  
Development Stage ◽  
Oil Fields ◽  
Source Rocks ◽  
Upward Migration ◽  
Tomsk Region ◽  
Jurassic Rocks ◽  
Gas Potential ◽  
Predictive Indicators

Commercial significance of the majority of Western Siberian oil fields is concerned with the Senomanian, Neocomian and, above all, Upper Jurassic horizons. For now, oil fields are at the late development stage and resource potential of the Jurassic horizon is strongly expired. Commercial potential of the pre-Jurassic (Paleozoic) rocks has been brought out throughout all territory of oil and gas province. Extensive work on estimation of the pre-Jurassic rocks oil and gas potential is performed in southeast, in the territory of Tomsk Region, within which 13 hydrocarbon deposits have been discovered in the Paleozoic. Original hypothesis of anomalousness of geophysical and petrophysical characteristics of the Jurassic layers — uniqueness of «indication» the Paleozoic deposits in geophysical parameters of overlaying Mezozoic-Cenozoic section was stated as a foundation of new prospecting criterion for the Paleozoic deposits. The Paleozoic formations are accepted as a complex with its own oil generating potential, which results in upward migration of hydrocarbon fluids. Additionally, downward direction of vertical interstratal hydrocarbon migration from the Jurassic source rocks into the pre-Jurassic complex is brought out. It was accepted as a conception that as in case of upward, so in case of downward fluid migration, processes of superposed epigenesis perform and lead to secondary epigenetic transformations of rocks of transit Jurassic layers, which result in their anomalous geophysical and petrophysical characteristics. This paper analyzes and compares geophysical and petrophysical characteristics of the Jurassic layers of different field types in Tomsk Region: without oil and gas potential in pre-Jurassic section, with commercial inflows from the pre-Jurassic complex and unknown type. Results of exploration electrical resistivity and carbonatization in the Jurassic layers of 200 wells and also spontaneous potential variation, electrical resistivity and natural radioactivity in Bazhenov suite confirm anomalousness of geophysical and petrophysical parameters of Jurassic rocks in case of pre-Jurassic deposits. This paper determines 6 geophysical and petrophysical characteristics of the Jurassic layers as predictive indicators for oil and gas potential estimation in pre-Jurassic section. Efficiency analysis of using predictive indicators for bringing out fields with and without deposits in the pre-Jurassic complex was performed for different prospecting cases in the research territory with account taken of possible complexing of indicators, their rank and actual availability. This paper states preference of indicators complexing. Application of a new prospecting criterion will improve efficiency of searching in new prioritized stratigraphic horizon — the Paleozoic, which contains unconventional oil.

scholarly journals Comparative petrophysical characteristics of the Jurassic sections of the Tomsk Region fields (in relation to petroleum potential of pre-Jurassic sequences)

2020 ◽  
Vol 15 (4) ◽  
Author(s):  
A.O. Aleeva ◽  
◽  
G.A. Lobova ◽  
E.N. Osipova ◽  
◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Comparative Analysis ◽  
Natural Radioactivity ◽  
Oil And Gas ◽  
Fluid Migration ◽  
Petroleum Potential ◽  
Deep Wells ◽  
Tomsk Region ◽  
Jurassic Rocks ◽  
Gas Potential

In case of upward, so in case of downward fluid migration, processes of superposed epigenesis perform and lead to secondary epigenetic transformations of rocks of passage Jurassic strata, which result in their anomalous geophysical and petrophysical characteristics. A generalizing comparative analysis of the geophysical and petrophysical characteristics of the Jurassic section of different field types in Tomsk Region was carried out: without petroleum potential in pre-Jurassic sequences, with commercial inflows from the pre-Jurassic structures. Results of exploration electrical resistivity and carbonatization in the Jurassic section of deep wells and also spontaneous potential variation, electrical resistivity and natural radioactivity in Bazhenov Formation confirm anomalousness of geophysical and petrophysical parameters of Jurassic rocks in case of pre-Jurassic sequences. This paper determines 6 geophysical and petrophysical characteristics of the Jurassic strata as predictive indicators for oil and gas potential estimation in pre-Jurassic section.

The Effect of Drilling Waste on Water Resources - The Elemental Composition of Waste

2017 ◽  
Vol 743 ◽  
pp. 338-341 ◽  
Author(s):  
Aleksandra Sergeevna Mishunina ◽  
Alena Andreevna Mekh ◽  
Egor Grigorevich Yazikov
Keyword(s):  
Oil And Gas ◽  
Oil Fields ◽  
Anthropogenic Sources ◽  
Natural Environments ◽  
Gas Wells ◽  
Drill Cuttings ◽  
Chemical Substances ◽  
Drilling Waste ◽  
Oil And Gas Wells ◽  
Tomsk Region

In order to maintain the volume of oil and gas supplies, the number of oil and gas wells increases every year, drilling platforms are built, which proportionally increases the amount of sludge and drilling waste mud, which must be recycled. The research gives light to the danger of introducing chemical substances into various natural environments from industrial and anthropogenic sources on an example of drill cuttings from oil fields of Tomsk region.

scholarly journals Petroleum Potential of the Deep Ordovician- Lower Devonian Oil and Gas Complex in the South-East of the Timan-Pechora Petroleum Province

2021 ◽  
Vol 20 (3) ◽  
pp. 274-283
Author(s):  
E.A. Kuznetsovа ◽  
Keyword(s):  
Lower Devonian ◽  
Oil And Gas ◽  
Source Rocks ◽  
Hydrocarbon Generation ◽  
The South ◽  
Reservoir Properties ◽  
Lower Paleozoic ◽  
Petroleum Potential ◽  
Middle Paleozoic ◽  
Gas Potential

The article is devoted to the assessment of the oil and gas potential of the deep Ordovician-Lower Devonian oil and gas complex in the south-east of the Timan-Pechora oil and gas province. Within the Upper Pechora Basin of the Pre-Ural trough and in the south of the Pechora-Kolva aulacogen, several wells were drilled with a depth of more than 5 km, some of which entered the Lower Paleozoic deposits. These strata are difficult to access and poorly studied, and the prospects for their oil and gas potential are unclear. The article describes the composition of the complex, gives geochemical characteristics, describes reservoir properties, and presents the results of 1D and 2D basin modeling. Models of the zoning of catagenesis are presented. The oil and gas complex includes a variety of oil and gas source rocks. It is possible to allocate collectors, as well as the seals. In the Lower Paleozoic sediments, the processes of oil, gas and gas condensate generation took place, which could ensure the formation of deposits both in the deep strata of the Lower and Middle Paleozoic, and in the overlying horizons. The generation and accumulation of hydrocarbons in deep-buried sediments occurred at a favorable time for the formation of deposits. However, it is considered that the scale of hydrocarbon generation for the Lower Paleozoic deposits is not high.

Prerequisities for development of the oil and gas potential of pre-Jurassic rocks in the Kara Sea

2007 ◽  
Vol 417 (2) ◽  
pp. 1308-1311
Author(s):  
G. S. Kazanin ◽  
G. A. Tarasov ◽  
T. A. Kirillova-Pokrovskaya
Keyword(s):  
Oil And Gas ◽  
Kara Sea ◽  
Jurassic Rocks ◽  
Gas Potential

Upper Carboniferous Shale Gas Potential Analysis in Eastern Qaidam Basin, Northwestern China

2014 ◽  
Vol 1010-1012 ◽  
pp. 1425-1429
Author(s):  
Hai Yan Cheng ◽  
Yin Sheng Ma ◽  
Cheng Ming Yin ◽  
Yuan Yuan Yang
Keyword(s):  
Organic Matter ◽  
Shale Gas ◽  
Oil And Gas ◽  
Qaidam Basin ◽  
Source Rocks ◽  
Carbonaceous Shale ◽  
Silty Mudstone ◽  
Upper Carboniferous ◽  
Carboniferous Shale ◽  
Gas Potential

Shale of rich organic matter presents in Upper Carboniferous in Qaidam Basin, Northwest of China. Carboniferous shale thickness is between 100 ~ 300m in the Qaidam Basin, the shale includes silty mudstone shale, calcareous mudstone, shale and carbonaceous shale, and it is very favorable lithology type for shale gas. According to the shale organic geochemical analysis, the abundance of organic matter reaching the middle - good degree of hydrocarbon source rocks; the type of organic matter is mainly II2 and III type. The maturity of organic matter is mainly between 1 % -1.3 %. The Upper Carboniferous shale thermal evolution is in mature oil and gas stage. The Upper Carboniferous hydrocarbon-rich shale distribute stability, with great thickness. Shale gas potential in Upper Carboniferous is quite large.

scholarly journals Geochemical and hydrogeological parameters informativity in oil and gas geology

Georesursy ◽  
2021 ◽  
Vol 23 (2) ◽  
pp. 214-220
Author(s):  
Maria A. Bolshakova ◽  
Anna V. Korzun ◽  
Antonina V. Stoupakova ◽  
Roman S. Sautkin ◽  
Anton G. Kalmykov ◽  
...  
Keyword(s):  
Organic Matter ◽  
Oil And Gas ◽  
Fluid Dynamic ◽  
Development Stage ◽  
Source Rocks ◽  
Salt Deposition ◽  
Hydrogeological Parameters ◽  
Stage Of Development ◽  
Geochemical Studies ◽  
Dynamic Connectivity

The article discusses the fundamental possibilities of using the results of geochemical and hydrogeochemical studies of organic matter, oils and waters in oil and gas geology, including for objects at the stage of development. It is shown that complex geochemical studies of oils and waters make it possible to get more correct conclusions about the presence or absence of fluid-dynamic connectivity of different horizons. Studies of organic matter and oils allow (by basin modeling instrument) to understand the contribution of different source rocks to formation of oils of different reservoirs. Hydrogeochemical studies of associated waters and waters used in the reservoir pressure maintenance system in a complex of works not only actively complements the knowledge about the presence or absence of fluid-dynamic connections between reservoirs and production objects, but also make it possible to predict, for example, salt deposition on equipment and in the reservoirs, and therefore allow you to prevent the possibility of unwanted salt deposition. The conclusions are based on the results of comprehensive geological and geochemical studies carried out by the authors for one of the deposits of the Krasnoleninsky arch of Western Siberia, which is at the development stage, as well as on the previous experience of the authors.

scholarly journals Indicator signs of carbonate microbialites in black shale formations: isotopic composition and biomarkers

2021 ◽  
Vol 11 ◽  
pp. 55-61
Author(s):  
M. A. Tugarova ◽  
Keyword(s):  
Isotopic Composition ◽  
Black Shale ◽  
Oil And Gas ◽  
Source Rocks ◽  
Unconventional Reservoirs ◽  
Shale Formations ◽  
Geological Processes ◽  
History Of ◽  
Oil Source ◽  
Gas Potential

Carbonate rocks represented by nodules, lenses, layers of different morphology and length are typical for the black shale formations of different ages. They are of the greatest interest in oil source rocks as indicators of complex and not always unambiguously interpreted geological processes. A special place among these sedimentary bodies is occupied by microbialites, which indicate suppression of development of marine organic biocenoses, and often reflect emanation processes in ancient strata. Proof of these phenomena is fundamentally important for predicting and assessing the oil and gas potential of unconventional reservoirs. On the example of carbonate solids of Triassic and Jurassic black shale formations, we present a complex analytical method to determine the microbial biochemical genesis of rocks on the base of the isotopic composition of carbon and oxygen, together with the hydrocarbon molecular markers of organic matter. The geochemical features of the isolated microbialites suggest that they are resulted from a complex history of black shale formations, which reflects both background lithogenetic transformations and superimposed processes, including high-temperature hydrothermal ones.

scholarly journals A systematic approach to unconventional play analysis: the oil and gas potential of the Kockatea Shale and Carynginia Formation, North Perth Basin, Western Australia

2015 ◽  
Vol 55 (1) ◽  
pp. 193 ◽  
Author(s):  
Gareth Cooper ◽  
Roger Xiang ◽  
Nick Agnew ◽  
Phil Ward ◽  
Mark Fabian ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Image Data ◽  
Source Rocks ◽  
Stress Regime ◽  
The North ◽  
Type D ◽  
Local Perturbations ◽  
Static Data ◽  
Mapping Process ◽  
Gas Potential

Key formations throughout the North Perth Basin have been mapped from 3D and 2D seismic data to define depth grid inputs to a 3D basin model calibrated with temperature and maturity data from 45 wells, plus an additional 27 pseudo well models. The Permian Carynginia Formation and Early Triassic Hovea Member of the Kockatea Shale have been defined in this model as unconventional shale reservoir targets. Basin-wide pyrolysis data have been used to construct kinetics curves for both the Carynginia Formation and Kockatea Shale, which define Type D/E and mixed B, and D/E kerogen types, respectively. When combined with thermal history inputs, these source rocks expel and retain significant volumes of hydrocarbons, of which the free hydrocarbons in the retained components reach 22 BCF/km2 for the Carynginia Formation gas and 8 MMBBLS/km2 and 21 BCF/km2 for the Hovea Member liquids and gas, respectively. The defined kinetics relationships allow the estimation of kerogen-specific oil and gas windows, which have been applied across the study area to map unconventional play fairways for both formations, and to calculate the initial total organic carbon (TOC) and hydrogen index (HI) for each unit prior to significant maturation. This study employs a mass balance approach through basin modelling as a means of estimating likely retained hydrocarbon volumes in key unconventional reservoirs in the basin. Sonic and density data from 28 wells in the basin have been used to calculate theoretical porosity to determine likely areas of overpressure. When combined with observed connection gas peaks and modelled maturity, there is a reasonable correlation suggesting that the basin exhibits modest overpressure of 2–6 MPa associated with the main gas window at 1.2 Ro% and this observation is applied to the play fairway mapping process. Play fairways are further constrained through geomechanical and stress considerations from mechanical earth models (MEMs) built from log and image data for wells in the basin. These data define an overall strike-slip stress regime with SHmax consistently oriented east to west with the exception of local perturbations. Dynamic rock strength calculated from the same MEM process shows target zones in the Kockatea Shale and Carynginia Formation ranging from ~60–130 MPa unconfined compressive strength (UCS), calibrated against available static data. The net thickness of rock with a UCS >75 MPa is mapped and overlain on retained in place hydrocarbon maps to restrict the area of likely economically extractable resource. While unconventional play cut-offs in the Perth Basin are notably lower than those commonly used in shale gas plays in the US, successful stimulation of Perth Basin rocks has been demonstrated by substantial flows from wells such as Arrowsmith–2. This study outlines a new workflow for mapping unconventional resources and suggests that Australian rocks are unique in both depositional environment and mechanical properties such that unconventional assessment using US play cut-offs may be misleading.

GEODYNAMICS OF THE SEDIMENTARY COVER AND OIL-AND-GAS PROSPECTS OF THE TOMSK REGION EASTERN TERRITORY

2021 ◽  
pp. 21-30
Author(s):  
V. V. Sapyanik ◽  
◽  
E. Yu. Lapteva ◽  
E. V. Lyubutina ◽  
A. I. Nedospasov ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Sedimentary Cover ◽  
Development Stage ◽  
Integrated Analysis ◽  
Test Results ◽  
The West ◽  
Tomsk Region ◽  
Geodynamic Processes ◽  
History Of ◽  
Tectonic Development

The article deals with geodynamic processes of the plicative tectonics of the Mesozoic-Cenozoic development stage in the southeastern territory of the West Siberian hemisyneclise, which allowed scientists to significantly clarify the configuration of multi-ordinal structures, to identify the second-order negative structure in the territory of the Baraba-Pikhtovka monocline, and to offer a new view of the structural-tectonic zoning of the Tomsk region eastern territory sedimentary cover. To substantiate the prospects of Jurassic petroleum plays, their resource potential is estimated using the basin modeling method. Based on an integrated analysis of structural imagings, history of the territory tectonic development, calculated maps of effective capacities, test results and WL conclusions, 42 traps of structural, structural-lithological, structural-stratigraphic types were mapped and their assessment by the volume-statistic method by Dl category [inferred resources] was given. The results obtained significantly expand the prospects for peripheral territories of the West Siberian Plate, where it is necessary to complete regional geological exploration.

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