scholarly journals ZONALITY OF WATER-DDISSOLVED GASES IN THE OIL-AND-GAS BEARING SEDIMENTS OF THE NADYM-TAZ INTERFLUVE

2019 ◽  
Vol 2 (1) ◽  
pp. 133-140
Author(s):  
Dmitry Novikov
Keyword(s):  
Middle Jurassic ◽  
Oil And Gas ◽  
Dissolved Gases ◽  
Gas Saturation ◽  
Oil Deposits ◽  
Gas Bearing

The results presented in the work were obtained in the studies of the features and zonality of water-dissolved gases within the boundaries of the oil-and-gas bearing sediments of the Nadym-Taz interfluve. Methane-containing waters with total gas saturation from 0.3 to 5.7 l/l and average CH4 content from 95.5 vol.% in the Aptian-Albian-Senomanian complex to 83.3 vol.% in the Lower and Middle Jurassic complex are developed in the region. With an increase in the depth, an increase in the content of homologues ΣHС (C2H6, C3H8, C4H10, C5H12 and C6H14) occurs from 1.34 vol.% in the Aptian_Albian-Senomanian complex to 11.67 vol.% in the Lower and Middle Jurassic complex. The maximal concentrations of ΣHС up to 30 vol.% were revealed in the lower part of the Neocomian complex in the marginal waters of oil deposits. An increase in CO2 content and a regular decrease in the ΣHС/N2 ratio from 96 in the Aptian-Albian-Senomanian complex to 52 in the Lower and Middle Jurassic complex are observed with an increase in the depth.

Prediction of Oil and Gas Occurrence in the Jurassic Reservoirs of the Zone of Junction of the Yenisei–Khatanga and West Siberian Basins

2021 ◽  
Vol 62 (2) ◽  
pp. 173-193
Author(s):  
D.A. Novikov ◽  
E.V. Borisov
Keyword(s):  
Middle Jurassic ◽  
Oil And Gas ◽  
Sedimentary Cover ◽  
Naphthenic Acids ◽  
Weakly Alkaline ◽  
Study Region ◽  
Gas Saturation ◽  
Gas Occurrence ◽  
Gas Fields ◽  
Favorable Conditions

Abstract —Based on a comprehensive analysis of the geologic structure, hydrogeology, and hydrogeochemistry, we predict oil and gas occurrence in the Jurassic reservoirs of the zone of junction of the Yenisei–Khatanga and West Siberian basins. We have established the regularities of formation of sandstones of the Sigovaya, Malyshevka, Vym, Nadoyakha, Sharapovka, and Zima reservoirs and examined their poroperm properties. The studied Lower and Middle Jurassic deposits, beginning from the Malyshevka reservoir, are characterized by abnormally high formation pressures with an anomaly ratio of up to 1.92. The Jurassic reservoirs bear weakly alkaline, moderately brackish to slightly saline groundwater of Cl Na, Cl–HCO3 Na, and HCO3–Cl Na compositions with TDS = 3.0–23.3 g/dm3. The low-mineralization connate waters determine an inverse vertical hydrogeochemical zoning in the sedimentary cover of the study region. The research data show favorable conditions for the generation and accumulation of hydrocarbon pools. It is shown that the main criteria for oil and gas occurrence are hydrogeochemical (contents of organic compounds, NH4, B, I, Br, naphthenic acids, and benzene; B/Br and HCO3/Cl coefficients), gas (total gas saturation of formation waters, degree of their gas saturation (Kg), and composition of water-dissolved gases), and hydrodynamic (formation pressures and their anomaly ratio (Ka)) indicators. Also, complex anomalies have been revealed in the Jurassic deposits, which trace the gas fields and revealed oil and gas occurrences. The Jurassic reservoirs are most promising for structure-lithologic traps in the peripheral zones of the basin and on the slopes of large positive structures. The Middle Jurassic deposits in the interior of the Yenisei–Khatanga Basin, poorly studied by deep drilling, might also be of interest as potential hydrocarbon pools.

Geochemistry of water-dissolved gases of oil-and-gas bearing deposits in the southern areas of Ob-Irtysh interfluve

2019 ◽  
pp. 70-81
Author(s):  
D. A. Novikov ◽  
A. E. Shokhin ◽  
A. A. Chernykov ◽  
F. F. Dultsev ◽  
A. V. Chernykh
Keyword(s):  
Oil And Gas ◽  
Dissolved Gases ◽  
Gas Bearing

scholarly journals PROSPECTS FOR THE ALLOCATION OF PRODUCTIVE SITES IN JURASSIC SEDIMENTS IN THE AREAS OF THE FROLOVSKAYA OIL AND GAS BEARING REGION

2018 ◽  
pp. 7-14 ◽  
Author(s):  
S. R. Bembel ◽  
R. M. Bembel ◽  
R. V. Avershin ◽  
V. A. Kornev
Keyword(s):  
Oil And Gas ◽  
Seismic Survey ◽  
Oil Deposits ◽  
Gas Bearing

Prospects for the allocation of productive sites in the Jurassic interval of the section in the territory of Syngegan terrace were considered, based on the analysis of seismic survey, drilling and core studies. We identified the interrelation between productive sites of local oil deposits and the centers of rock area of destruction allocated according to seismic survey materials.

scholarly journals HYDROGEODYNAMIC AND HYDROGEOCHEMICAL CONDITIONS OF THE LOWER-MIDDLE JURASSIC COMPLEX IN TALINSKOYE OIL FIELD

2016 ◽  
pp. 6-11
Author(s):  
R. N. Abdrashitova ◽  
R. S. Akzhanov ◽  
E. A. Lukyanenko
Keyword(s):  
Mass Transfer ◽  
Middle Jurassic ◽  
Oil And Gas ◽  
Oil Field ◽  
Reservoir Pressure ◽  
Salt Composition ◽  
Background Value ◽  
Gas Bearing

Hydrogeodynamic and hydrogeochemical conditions of the Lower-Middle Jurassic complex are considered on the example of the oil field Talinskoye located in Krasnoleninsk oil and gas bearing area. The authors describe the complicated structures of the hydrogeodynamic and hydrogeochemical fields in the studied area. It is shown that the deficit reservoir pressure is in average 1.6 MPa. Within the field the zones of the waters ion-salt composition anomalies have been are identified. These zones are characterized by low values of mineralization (in average 5 g/l) as compared to the background value (8 - 9 g/l). The dependence of the hydrogeochemical anomalies formation on the faults position, the temperature of the basement top and the values of reservoir pressures is consistent with the model of the conjugated falling-rising mass transfer.

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