Geology, Geophysics and Development of Oil and Gas Fields

THE MAIN CHARACTERISTICS OF GEOLOGICAL STRUCTURE OF THE JURASSIC
AND CRETACIOUS BORDERING DEPOSITS IN THE PRE-URAL AREA
OF THE WEST SIBERIAN SEDIMENTARY BASIN (p. 4)

Mikhail Alexandrovich Fomin

Trofimuk Institute of Petroleum Geology and Geophysics, SB RAS (IPGG SB RAS)

3, Koptyug prosp., Novosibirsk , 630090, Russian Federation,

tel./fax: (383) 306-63-70,

e-mail: FominMA@ipgg.sbras.ru

Based on well-log data, analysis the geological structure and distribution of the Upper Danilovsky, sub-suite and Mulyminsky and Tutlejmsky suits in the Pre-Urals area of the West Siberian sedimentary basin is analyzed in detail. The areas of facial transition between them are allocated. The boundary between Tutlejmsky and Mulyminsky suits spreading that should be added onto the map of the Callovian and the Upper Jurassic structural-facial zoning is proposed. The fact that the boundary divides the Bazhenovo horizon rocks, that differ in their oil potential, is proved.

A three-lake thickness that is a part of the Low Mulyminsky sub-suit, located in the southern part of Shaimsky mega-offset, is identified. It is shown that the three-lake thickness is of wider spreading than it was earlier assumed and is opened in the Semividovsky and Tolumsky areas as well. A quick sequential change of facies from course grained littoral sediments (Vogulkinsky thickness) to deep-water fine-grained ones (Abalaksky suit) in the southern slope of Shaimsky mega-offset is identified.

Based on the well-log data analysis, the transposition of the boundary between Kazym-Kondinsky and Yamal-Tyumensky facial regions is proposed. It is substantiated that the Callovian and Upper Jurassic deposits free zone in the Beryozovsky gas potential region on the structural-facial zoning map was shown incorrectly. Instead of this zone, it should be better to add on the map the Volgian marine deposits-free zone proposed by I.I. Nesterov in 1974.

Keywords: structural-facial zoning; the Upper Jurassic sediments; Tutlejmsky suite; Mulyminsky suite; Danilovsky suite; Bazhenovsky horizon; the West-Siberian sedimentary basin.

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UDC 551+552.5 DOI: 10.30713/2413-5011-2018-7-19-26

THE PROBLEMS OF TURONIAN-EARLY CONIACIAN SEDIMENTATION
WITHIN THE BOUNDARIES OF THE WEST SIBERIAN PLATE (p. 19)

A.I. Kudamanov, Cand. of geol.-mineral. sci.,

S.E. Agalakov, Cand. of geol.-mineral. sci.,

V.A. Marinov, Cand. of geol.-mineral. sci.

LLC "Tyumen Petroleum Research Center"

42, Maxim Gorky str., Tyumen, 625048, Russian Federation,

e-mail: aikudamanov@rosneft.ru

The article presents a specified assessment of sedimentation environments and formation conditions as well as the author's conceptual model of the Upper Cretaceous structure of the West Siberian Plate [1]. Four sedimentary complexes (from the bottom upward) are identified in the post-salt part of the section. They are Kuznetsovsky (the Turonian–Lower Coniacian), Nizhneberezovsky (the Middle and Upper Coniacian–Santonian), Verhneberezovsky (the Campanian) and Gankinsky (the Upper Campanian–Maastrichtian). Some maps-schemes of total thickness of Kuznetsovsky suit (separately of Dorozhkovsky suit, Gazsalinsky and Myarayakhinsky unites, Nizhneberezovsky sub-suit common thicknesses (separate maps of NB₄, NB₃units and the sum of NB₁ +NB₂+ NB₄units), Verhneberezovsky sub-suit and Gankinsky horizon are built. The Turonian–Lower Coniacian sediments are briefly characterized in the article.

Keywords: Kuznetsovsky suit; Dorozhkovsky suit; Gazsalinsky unite; Myarayakhinsky unit; the Turonian stage; terrigenous material; chemogenic sedimentation; transgression; regression.

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UDC 553.98(470.56) DOI: 10.30713/2413-5011-2018-7-27-35

GEOLOGICAL SPECIFIC FEATURES OF THE FLUID SEAL
IN THE CARBONATE THICKNESS SECTION OF THE FAMENIAN STAGE
IN ORENBURG REGION (p. 27)

V.A. Shakirov, A.P. Vilesov, L.A. Luzina, N.N. Chikina, K.A. Gabdrakhmanova, K.F. Miropoltsev

LLC "Tyumen Petroleum Research Center"

42, Maxim Gorky str., Tyumen, 625048, Russian Federation,

e-mail: tnnc@rosneft.ru

I.A. Maximova

LLC "SamaraNIPIneft"

18, Vilonovskaya str., Samara, 443010, Russian Federation

Lately, the necessity of improving the accuracy of qualitative fluid seals prediction in carbonate deposits increases significantly. This is especially important when prospecting for new oil deposits, where an incorrect assessment of the sealing properties can bring passing of productive objects. The greatest difficulties when evaluating the seals arise due to their low knowledge, especially directly on the core material. That’s why, at the first stage of the work, the cores, taken from the dense packs (potential seals) of the Famenian stage, were subjected to laboratory analysis. The results of the analysis proved the fact that, quite expectedly, there occurred an urgent need of additional study of core from dense parts of the section. The total volume of complex studies of core from dense packs of the Famenian thickness in Tyumen Research Petroleum Center almost twice increased in 2017 and amounted to 250 samples. The fluid seals under study are represented by the core unevenly both by the area and the section, thus making it difficult to summarize the results, claiming for completeness. Nevertheless, the generalization, carried out with the use of new information, gives specified understanding of the geological structure of the potential fluid seals in the Famenian stage of Orenburg Region.

Keywords: core study; fluid seals; carbonate thickness; the Famenian stage.

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UDC 622.276.1/.4.001.57:622.276.66 DOI: 10.30713/2413-5011-2018-7-36-40

laboratory modeling of cracks
AFTER A FORMATION hydraulic fracturing (p. 36)

Nikolay Nikolaevich Barkovsky,

Aleksey Maratovich Amirov,

Dmitriy Valerievich Beloglazov,

Mikhail Vladimirovich Shmakov

PermNIPIneft, a branch of LLC "LUKOIL–Engineering" in Perm, Core and Fluids Research Center

29, Sovetskaya Armiya str., Perm, 614000, Russian Federation,

e-mail: Nikolaj.Barkovskij@pnn.lukoil.com, Aleksey.Amirov@pnn.lukoil.com, Dmitrij.Beloglazov@pnn.lukoil.com, Mikhail.Shmakov@pnn.lukoil.com

At present hard-to-recover hydrocarbon reserves, confined to low-permeability, weakly-drained, heterogeneous and dismembered reservoirs, are extensively developed. One of the most effective methods, applied to increase the productivity of wells, that open such formations, and to raise the rate of oil recovery out of them is a formation hydraulic fracturing (FHF). FHF is a process of creation of highly permeable channels (fracture systems) by injecting viscous liquid (fracturing fluid) into the formation under a high pressure. Along with the fracturing fluid, to avoid fractures closure, a propping agent (proppant, sand) is introduced. It prevents narrowing of the fractures walls and helps to maintain the fractures permeability at sufficiently high level. The authors of the article considered the main methods of modeling of a fracture that resulted from FHF in the laboratory and presented their own advanced method aimed at increasing the level of obtaining the reliable information about the process that occur in the fracture after the fracturing fluid destruction.

Keywords: permeability and conductivity of a proppant agent; Ohio sandstone; fractured and laminated core; a formation hydraulic fracturing (FHF); fracturing fluid; cell of conductivity.

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UDC 550.8.072 DOI: 10.30713/2413-5011-2018-7-41-43

THE PROBLEM OF MODELING THE OIL-SATURATED CUBE
BY DIFFERENTIATING THE RESERVOIR POROSITY PARAMETER (p. 41)

A.G. Minnullin

LLC "NPO "Neftegaztechnologia"

96/2, Revolutsionnaya str., Ufa, 450078, Republic of Bashkortostan, Russian Federation,

е-mail: npo@ngt.ru

The paper presents a saturation cube differentiation of by the type of a rock in heterogeneous formations. For the three identified groups of the reservoir, the dependences of the change in the water saturation coefficients of the reservoir, the residual water saturation on the bedding height above the water-oil contact (WOC), was obtained for the conditions of the Tournaisian stage of Alexeevsky deposit. This method of determining the water saturation change is recommended for practical use when constructing a geological-hydrodynamic model of deposits with a high degree of the reservoir heterogeneity as well as for estimating and refining the current WOC when operatively evaluating the residual oil reserves.

Keywords: water saturation; transition zone; type of a collector; porosity; clean water table; modeling.

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UDC 556.3(540.4) DOI: 10.30713/2413-5011-2018-7-44-51

CHEMICAL COMPOSITION OF FRESH GROUNDWATER IN NATURAL
AND DISTURBED CONDITIONS IN THE SOUTH-WESTERN AREA
OF KHMAO – YUGRA REGION (p. 44)

M.V. Vashurina

A.A. Trofimuk Institute of Petroleum Geology and Geophysics, RAS, West Siberian branch

74, Taimyrsky str., Tyumen, 625026, Russian Federation,

e-mail: MVashurina@tmnsc.ru

Yu.O. Rusakova, A.L. Khramtsova

Tyumen Industrial University, West Siberian Institute of Oil and Gas Geology

56, Volodarsky str., Tyumen, 625000, Russian Federation

The article considers the results of the comparison of fresh groundwaters chemical composition in the period of development of the Oligocene water-bearing horizon and modern intensive operation in the south-western area of Khanty-Mansi Autonomous – Yugra territory. The conducted researches provided identification of a significant heterogeneity of the studied parameters such as dry residue, main anionic and cationic composition of water as well as analysis of their spatial-temporal changes. The zones of distribution of certain water types identified by the authors require further detailed research to reveal the factors influencing the chemical composition of water and the trends of its changes.

Keywords: fresh groundwaters; chemical composition; water type; cations; anions; dry residue; analysis; heterogeneity; trend.

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UDC 622.276.1/.4(470.4):553.98.061.17 DOI: 10.30713/2413-5011-2018-7-52-58

THE PROBLEM OF HYDROCARBONS GENESIS IN PERMIAN DEPOSITS
OF KRASNOYARSKOYE FIELD (p. 52)

O.S. Fedotkina, D.V. Zhuravlev, S.V. Demin, E.K. Solozhenkina, A.S. Kirillov, P.V. Pavlov

LLC "SamaraNIPIneft"

18, Vilonovskaya str., Samara, 443010, Russian Federation,

e-mail: FedotkinaOS@samnipineft.ru

I.S. Pytskiy, A.K. Buryak

A.N. Frumkin Institute of Physical Chemistry and Electrochemistry RAS (IPCE RAS)

31, Leninsky prosp., Moscow, 119991, Russian Federation

The paper describes the developed approach to the analysis of an oil deposit genesis in P₁ formation of the Permian sediments of Krasnoyarskoye field (Samara region). In this regard, a set of field historical data and laboratory studies by applying the chromatographic and mass-spectrographic methods was used. An attempt of scientific support of an oil deposit technogenic formation by means of a well-to-well crossflows was carried out.

Keywords: artificial deposit; genesis of oil; MALDI-MS, ICP-MS mass spectrometry.

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UDC 550.832.75:622.243.24 DOI: 10.30713/2413-5011-2018-7-59-64

DEFINITIONS OF SPECIFIC ELECTRIC RESISTANCE
IN HORIZONTAL WELLS (p. 59)

Alexander Petrovich Potapov

PJSC "Scientific-Research and Project Engineering Institute of Prospecting Wells Logging" (PJSC NPP "VNIIGIS")

1, Gorky str., Oktyabrsky, 452614, Republic of Bashkortostan, Russian Federation,

e-mail: potapov-57@bk.ru

Electric and electromagnetic methods of investigation are the main ones when estimating the oil and gas saturation coefficient, geological steering when drilling horizontal and directional wells. Determination of the specific electric resistance (SER) in horizontal wells sets new tasks for the development of the theory of mathematical and software provision, interpretation techniques and the equipment creation.

Wells drilling in a fixed formation, requires monitoring of the wellbore trajectory and information on the lithology of the section that is opened by the well bottom zone. It provides prompt adjusting of a well drilling direction.

The analysis of the materials of electric logging of inclined and horizontal wells drilled by applying the technologies of "AMK Horizon", "Horizontal" and "Rigid cable" proved the fact, that the effect of the formation limited thickness and the position of the well axis trajectory relative to the boundaries of the underlying and covering rocks can lead to errors when determining the specific electric resistance (SER).

Unlike the vertical wells, where the geo-electric section model is practically exactly known, in horizontal wells, the horizontal well profile relative to the boundaries of the horizontal formation is not well known.

The article considers some specific features of determination of the specific electric resistance in conditions of horizontal wells. A brief analysis of the current state of the problem is given. Mathematical modeling of electro-logging is carried out and the necessity to account for the influence of underlying and covering rocks when interpreting horizontal wells logging data is shown. An algorithm, software for determining the specific electric resistance are developed and the results of interpretation are presented.

Keywords: electric and induction logging; horizontal wells; underlying and covering rocks; specific electric resistance; mathematical modeling; software.

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UDC 622.276.031:53 DOI: 10.30713/2413-5011-2018-7-65-72

ELEMENTARY REPRESENTATIVE VOLUME IN THE PHYSICS OF A RESERVOIR.
PART 2. SCALE EFFECTS AND PETROPHYSICAL RELATIONS (p. 65)

Irina Pavlovna Gurbatova, Cand. of tech. sci.

"PermNIPIneft", a branch of LLC "LUKOIL–Engineering" in Perm

29, Sovetskaya Armiya str., Perm, 614000, Russian Federation,

e-mail: igurbatova@gmail.com

Boris Nikolaevich Enikeev, Cand. of tech. sci.

CJSC "PANGEA"

e-mail: BNE@pangea.ru

Nikolay Nilovich Mikhailov, Dr. of tech. sci.

Gubkin Russian State University of Oil and Gas (NRU)

65, bld. 1, Leninsky prosp., Moscow, 119991, Russian Federation

Oil and Gas Research Institute Russian Academy of Sciences (OGRI RAS)

3, Gubkin str., Moscow, 119333, Russian Federation,

e-mail: folko200@mail.ru

It is shown that the elementary representative volume for complexly-composed heterogeneous reservoirs, as a rule, exceeds the sizes of the tested core samples. In case of a different-scale determination of physical properties there occurs a scale effect, namely, the dependence of the measured physical properties on the characteristic dimensions of the samples under study. The scale effect manifestations when determining the reservoir porosity and permeability, the scale effect on the relationship of the specific electric resistivity of a core sample with the porosity parameter are described. The scale effect on the measured velocity of elastic waves propagation and the inter-relationship between this parameter and porosity is established. The scale effect on the characteristics of two-phase filtration and the degree of displacement of oil by water is shown.

Keywords: elementary representative volume; physical properties of a reservoir; scale effect; petrophysical inter-relations.

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