Geology, Geophysics and Development of Oil and Gas Fields

The article presents the physical essence of AVO-attributes method used when predicting oil and gas potential of the Jurassic-Cretaceous sediments of Iussky oil and gas region. The examples of a local prediction of oil and gas potential are given.

Keywords: AVO-attributes method; oil and gas potential region; seismographic record; seismic profile; amplitude anomalies.

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UDC 622.276

EVALUATION OF THE ACTUAL FRACTURE-CAVERN LIMESTONE RESERVOIRS

OF UPPER CRETACEOUS OIL DEPOSITS OF THE CHECHEN REPUBLIC (p. 11)

Skuba Dmitry Alexandrovich

LLC "NC "Rosneft"–Research and Technical Centre"

36, Mir str., 350000, Krasnodar, Russian Federation,

tel.: (861) 262-34-97,

fax: (861) 262-64-01,

e-mail: DASkuba@rn-ntc.ru

Savenok Olga Vadimovna,

Solovyova Valentina Nikolaevna

Kuban State Technological University

2, Moskovskaya str., 350072, Krasnodar, Russian Federation,

tel./fax: (861) 233-18-45,

e-mail: olgasavenok@mail.ru, KubGTU-INGE@yandex.ru

The article evaluates the actual capacity of the cavern-fractured limestone reservoirs of oil deposits of the Upper Cretaceous sediments in the Chechen Republic. It is shown that the rocks’ natural fractured capacity is at the level of 0,2…0,3 %. The real fissured oil-saturated capacity of the Upper Cretaceous limestone varies from the values of the natural fracturing to higher ones. Effective use of the deposits-analogues’ development results is recommended to get more reliable parameters of hydrocarbon deposits.

Keywords: geological and physical characteristics; cavern-fractured capacity of limestone reservoirs; oil recovery factor; assurance factor of reserves calculation; water-flooded volume of reserves; variables used to estimate a deposit’s reserves; deposits-analogues’ development results.

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UDC 553.98.048:550.8.072

VOLUMETRIC VARIABLES UNCERTAINTY AND ITS INFLUENCE

WHEN ESTIMATING THE VOLUME OF HYDROCARBON RESOURCES

BY PROBABILISTIC CALCULATION METHOD (p. 17)

Georgievskiy B.V., Granovskiy A.M.

LUKOIL International Upstream East

Bochkarev V.A.

LUKOIL International Upstream West

Volume calculation of hydrocarbon resources by probabilistic calculation method is an essential stage in the study of any oil and gas basin. Based on the probabilistic assessment the conclusions about the feasibility of exploration works as well as about the economic prospects of any oil- and gas-bearing deposit or a play are drawn. The uncertainty in the selection of calculation parameters as well as the probability of the value distribution laws can lead to significant differences in the resulting estimates. Short review of probability distribution functions as well as examples of their applications is followed by description of the results of resources volume calculation by probabilistic methods. Probabilistic assessment is made for the model object that is composed by three different types of hydrocarbon accumulations: structural (anticline) accumulation, massive and tectonically screened ones. To ensure the completeness of the analysis and accuracy of calculations while modeling, all possible combinations of input parameters and laws of their values probability distribution are considered. The results obtained show in particular substantial variation of the magnitude estimates of the resource base P10, P50 and P90, depending on the law of probability distributions for each of the calculation parameters.

Keywords: resources volume calculation; probabilistic method; uncertainties of volumetric variables; Monte-Carlo modeling; probability distribution functions.

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UDC 622.276+622.279

POSSIBILITY OF GEOLOGICALLY-COORDINATED SPECIFICATION

OF A GAS-HYDRODYNAMIC MODEL PARAMETERS IN THE INTER-WELL SPACE

BY WELLS OPERATION DATA (p. 33)

Zakirov Ernest Sumbatovich,

Shiryaev Ivan Mikhailovich,

Indrupsky Ilya Mikhailovich,

Lubimova Olga Viktorovna

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

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

tel./fax: (499) 135-54-67,

e-mail: ezakirov@ogri.ru, shiryaev.ivn@gmail.com, i-ind@ipng.ru, olga-ezhik@yandex.ru

This paper presents algorithms for solving the inverse problem of automated adaptation of 3D gas-hydrodynamic model of a production formation to the data of wells operation in geologically-coordinated formulation. The solution of the inverse problem is carried out in the optimization manner using efficient methods of optimal control theory (adjoint methods). To identify a reservoir parameter distributions in the inter-wells space, along with the parameters of a variogram and "porosity-permeability" dependence for each facies, values of reservoir properties at control points are proposed to be updated. Influence of the control points on the obtained realizations of the field when its building by deterministic and stochastic methods application is studied. Control points were set both close to wells or equidistant from the known initial data. It is shown that the proposed approach can be used to specify the fields of reservoir properties in the inter-wells space without any loss of the model geological structure, when reaching models calculation correspondence to production actual data. Automation of the inverse problems solution can significantly reduce time expenditures and subjectivity of 3D model adaptation to a deposit development as well as estimate the uncertainty of the model parameters and development prediction indicators.

Keywords: inverse problem; optimal control theory; geologically-coordinated formulation (tasking); variogram; kriging; sequential Gaussian simulation; method of control points.

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UDC 622.276.5.001.42+622.276.6

USING OF TRACER STUDIES TO EVALUATE THE INFLUENCE

OF ENHANCEMENT OIL RECOVERY (EOR) METHODS ON THE CHANGE

OF THE COVERAGE BY THE DISPLACEMENT PROCESS (p. 40)

Shilov Alexander Vladimirovich,
Morokova Natalya Andreevna

"PermNIPIneft", the branch of LLC "LUKOIL–Engineering" in the city of Perm

29, Sovetskaya Armiya str., 614066, Perm, Russian Federation,

tel.: (342) 233-63-20, (342) 233-64-27,

e-mail: Aleksandr.Shilov@pnn.lukoil.com, Natalya.Morokova@pnn.lukoil.com

The paper proposes to discuss formations tracer studying as a method of assessing the influence of oil recovery enhancement methods (EOR) on the change of oil displacement process. Despite the fact that the assessment is conducted at a qualitative level as compared with other methods applied, the tracer studies of the inter-well space present the method that demonstrates the direct process of the liquid filtration in conditions of a formation as well as allows getting the most realistic information about inhomogeneity of a formation’s properties. Conclusions about the conducted measures influence on the coverage by oil displacement process are based on the comparative analysis of tracer studies results carried out before and after the measures which include the assessment of changes of quantitative distribution of the injected water volumes among producing wells after application of EOR methods; getting information about changes of fluid flows’ direction and rate in the inter-well space; assessment of changes of channels permeability spectrum participating in water flooding process.

Keywords: tracer studies; indicator; studied injection well; monitoring producing well; sampling; permeability spectrum of flow channels; low filtration resistivity zones.

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UDC 622.276.21.031:532.51(1-04)VNC

SPECIFICATION OF OIL-WATER CONTACT (OWC) LEVEL IN THE OIL DEPOSITS

OF TOURNASIAN STAGE IN CASE OF UNRELIABLE FIELD AND

GEOPHYSICAL DATA (p. 44)

Gilmanova R.Kh.

LLC NPO "Neftegaztechnologia"

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

tel.: (347) 228-18-75,

е-mail: npo@ngt.ru

Belyaeva A.S.

Bashkir State University

Korovin V.M., Lensky V.A., Lobankov V.M.

JSC "NPF "Geophyzika"

Nazarov V.F., Tokarev M.A.

Ufa State Oil Technical University

The article describes the evaluation of the reliability of the geophysical researches results and formations non-qualitative testing at the objects with complex geological structure on the example of one of Orenburg region deposits.

The data inconsistencies elimination allowed specifying OWC level of KAP in the oil deposit of Tournasian stage in case of unreliable field and geophysical data, followed by its lowering by 7,5 m for the whole deposit.

Keywords: geological structure; geophysical surveys; oil-water contact; deposits of oil.

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UDC 622.276.1/.4:681.5.015

IDENTIFICATION OF SURFACE OIL SAMPLE

BY THE SIGNAL INTEGRATED PARAMETERS OF

ELECTRONIC ABSORPTION SPECTRUM (p. 49)

Yarmukhametova Gulnara Ulfatovna¹,
Dolomatov Mikhail Yurevich^{1, 2}

¹Ufa State Oil Technical University

1, Kosmonavtov str., 450062, Ufa, Republic of Bashkortostan, Russian Federation,

e-mail: muhagu@rambler.ru

²Bashkir State University

32, Zaki Validi str., 450076, Ufa, Republic of Bashkortostan, Russian Federation,

e-mail: dolomatov@gmail.ru

The article defines signal characteristics of electronic absorption spectra of surface oil samples in solutions, such as dispersion, mathematical expectation, autocovariance and autocorrelation function. It is found out that these characteristics differ for the oil of various fields, different nature and composition. Based on the uniqueness of the parameters under consideration, a method of identification of the objects to be studied is proposed.

Keywords: surface oil; signal function; electronic absorption spectrum; autocorrelation function; spectral density; dynamic properties; fraction composition; identification method.

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UDC 622.276.031:622.276.1/.4

A METHOD OF BUILDING MAPS OF FORMATIONS HETEROGENEITY

WHEN ORGANIZING EFFECTIVE GEOLOGICAL AND TECHNICAL MEASURES

(p. 53)

Halimov R.Kh., Loscheva Z.A.

PJSC "Tatneft" named after V.D. Shashin

35, Lenin str., 423450, Almetyevsk, Republic of Tatarstan, Russian Federation,

e-mail: tnr@tatneft.ru

Nurgaliev R.Z.

Almetyevsk State Petroleum Institute

2, Lenin str., 423450, Almetyevsk, Republic of Tatarstan, Russian Federation,

tel.: (855) 331-00-24,

e-mail: alni@rambler.ru

Makhmutov A.A., Khisamutdinov N.I.

LLC NPO "Neftegaztechnologia"

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

tel.: (347) 228-18-75,

е-mail: npo@ngt.ru

The article describes the method applied to build the maps of formations heterogeneity on the example of Novo-Pokursky field. The map allows fixing the zones of striking of layer-by-layer homogeneously and heterogeneously permeable formations, using of which increases the accuracy of filtration resistance determination being the most important parameter when organizing geological and technical measures in the allocated sites.

Keywords: layer-by layered heterogeneity of oil formations permeability; average porosity; average permeability; factor of permeability ratios.

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UDC 622.276.031:622.276.1/.4

A METHOD APPLIED TO EVALUATE LAYER-BY-LAYER HETEROGENEITY

OF OIL FORMATIONS PERMEABILITY IN CASE OF INFORMATION CONTENT

INSUFFICIENCY (p. 56)

Makhmutov A.A., Khisamutdinov N.I.

LLC NPO "Neftegaztechnologia, Ltd."

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

tel.: (347) 228-18-75,

е-mail: npo@ngt.ru

Halimov R.Kh.

PJSC "Tatneft" named after V.D. Shashin

35, Lenin str., 423450, Almetyevsk, Republic of Tatarstan, Russian Federation,

e-mail: tnr@tatneft.ru

Nurgaliev R.Z.

Almetyevsk State Petroleum Institute

2, Lenin str., 423450, Almetyevsk, Republic of Tatarstan, Russian Federation,

tel.: (855) 331-00-24,

e-mail: alni@rambler.ru

The article describes some method, applied to evaluate layer-by layer heterogeneity of oil formations permeability and based on the average values of t wells parameters in the absence of comprehensive of well log interpretation data base (WLIDB). It is noted that application of this method can significantly increase the addressness of the organized geological and technical measures, aimed at additional recovery of residual oil reserves out of the fields at the late stage of their development to optimize waterflooding system.

Keywords: layer-by layer heterogeneity of oil formations; square coefficient of permeability variance; coefficient of permeability ratio.

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UDC 622.276.031:622.276.1/.4

EVALUATION OF THE SPREAD OF OIL DISPLACEMENT EFFICIENCY

BY AREA IN HETEROGENEOUS BEDS (p. 59)

Sarvaretdinov R.G., Mahmutov A.A.

LLC NPO "Neftegaztechnologia"

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

tel.: (347) 228-18-75,

е-mail: npo@ngt.ru

Nurgaliev R.Z.

Almetyevsk State Petroleum Institute

2, Lenin str., 423450, Almetyevsk, Republic of Tatarstan, Russian Federation,

tel.: (855) 331-00-24,

e-mail: alni@rambler.ru

Lensky V.A.

JSC "NRF "Geophyzika"

Tokarev M.A.

Ufa State Oil Technical University

The paper proposes a quick method of express-assessment of spreading of oil displacement coefficient over the area in heterogeneous formations. It is noted that the method application in field conditions allows, with sufficient accuracy, evaluating the density of oil mobile reserves with further improving the addressness of geological-technical measures formation aimed at increasing the volume of oil reserves recovery from heterogeneous formations.

Keywords: oil displacement coefficient; heterogeneity; permeability map; permeability coefficient of permeability ratios.

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UDC 553.98:543.272:546.291

HELIUM AND KARPINSKY RIDGE HYDROCARBON POTENTIAL

(ON THE EXAMPLE OF MARKOVSKY AND KRUZHILOVSKY FIELDS)

(p. 61)

Kornitsky P.M.

Kuban State Technological University

2, Moskovskaya str., 350072, Krasnodar, Russian Federation,

tel.:/fax: (861) 233-18-45,

e-mail: Pasha21vek@mail.ru

The article outlines the main indicators of helium depth. It also conducts analysis of hydrocarbons of Markovsky and Kruzhilovsky fields which served the basis for presenting a fluid dynamic model of formation of the fields under consideration. The analysis allowed making the following conclusions: connection of helium potential with gas potential of definite fields is fixed at the fields addressed by circumstantial evidence (presence of helium increased concentration in gas composition, as well as nitrogen, "the elevation of the foundation," listric faults tracking). This connection exists due to three-element system presence – deep-seated reservoir, feeder, deposit.

Keywords: Markovsky and Kruzhilovsky field; HC; helium; reserves; fluid dynamic model of deposits’ formation.

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JSC "ALL-RUSSIAN SCIENTIFIC-RESEARCH INSTITUTE OF ORGANIZATION, MANAGEMENT AND ECONOMICS OF OIL AND GAS INDUSTRY"

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