Geology, Geophysics and Development of Oil and Gas Fields

Factual data analysis serves the basis for identifying Moscow sedimentary basin on the territory if the eastern part of the East-European platform. The conclusion is made about presence of traps of Silurian – Devonian age in the sedimentary section within the boundaries of Moscow sedimentary basin. This fact, combined with the well-known features of oil and gas potential of the territory, allows giving high appraisal of the prospects to discover significant hydrocarbon deposits.

Key words: hydrocarbon deposits; oil and gas potential; aulacogens; fluid seals.

Order this article in the electronic library

UDC 550.8.011

PROGNOSIS OF OIL FIELDS SIZE IN OIL- AND GAS-BEARING TERRITORIES

OF VOLGA-URAL AND TIMAN-PECHORA PROVINCES (р. 7)

Zhilina Inna Vyacheslavovna, Novikova Olga Valentinovna, Popova Marina Nikolaevna

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

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

tel.: (499) 135-72-56,

fax: (499) 135-54-65,

e-mail: 58mo@mail.ru, popova@ipng.ru

The paper presents prognosis of the amount of the largest deposits reserves (within the boundaries of oil and gas territories) in Volga-Ural and Timan-Pechora oil- and gas-bearing provinces, that was made by applying some method, based on the analysis of stochastic relations of clusters distribution parameters by size with characteristics of the basin sedimentary filling. The largest deposit is considered that one which will be the largest in the oil- and gas-bearing province under discussion.

The results witnessed the fact that, despite the different geological history, the equation obtained for the Volga-Ural province to predict the size of the largest deposits in the within the oil- and gas-bearing province can be directly used for Timan-Pechora province. Oil- and gas-bearing provinces, within the territories of which large oil fields can be opened or additionally explored, are defined.

Key words: oil; prognosis of the largest field’s reserves; Timan-Pechora province; Volga-Ural province; oil and gas territory.

Order this article in the electronic library

UDC 553.98

TECTONIC criteria OF OIL-AND-GAS CONTENT AVAILABILITY

OF JURASSIC-CRETACEOUS DEPOSITS THE YENISEI-KHATANGA

REGIONAL TROUGH (p. 14)

Fomin Mikhail Aleksandrovich

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

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

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

e-mail: FominMA@ipgg.sbras.ru

Within the framework of the study in the western part of the Yenisei-Khatanga regional trough, prerequisites for the local forecast of petroleum potential have been revealed. Nineteen uplifts unexplored by deep drilling have been identified with an area of no more than 2000 km². The necessity of additional geological and geophysical studies in the Semyonovskaya, Tampeyskaya, Malokhetskaya, Yarovskaya, Payutskaya and Tokachinskaya areas to search for hydrocarbon accumulations in the specific strata has been substantiated. A separate forecast for oil and gas presence in the region has been made.

Key words: Yenisei-Khatanga regional trough; oil-and-gas content; Jurassic-Cretaceous deposits; potential objects; deposit; hydrocarbons.

Order this article in the electronic library

UDC 553.98(470.56)

GENESIS OF DOLOMITE RESERVOIRS OF BIYSK-AFONIAN CARBONATE COMPLEX

IN ORENBURG REGION (p. 25)

Vilesov A.P., Chertina K.N., Vorontsov I.P., Devyatka N.P.

"Tyumen Oil Scientific Center, Ltd." ("TNNC, Ltd.")

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

Sedimentological models of formation of biysk-afonian carbonate thickness in Orenburg region are considered. Development of biysk-afonian complex in accordance with the model of carbonate ramp is confirmed. It is shown that limestones of the Middle Devonian age, not subject to dolomite metasomatosis, are characterized by low porosity and permeability. Hydrothermal model of secondary dolomites formation is offered for the first time. The poofs for this model are provided. Garshinsky oil field served an example for making an assumption concerning the relationship of zones of hydrothermal study with the Early-Frasnian graben-shaped troughs.

Key words: Middle Devonian; Eifelian stage; Afonian super-horizon; Biyskian horizon; Orenburg region; limestones; secondary dolomites; dolomitization model.

Order this article in the electronic library

UDC 553.98(567)

OIL-AND-GAS SOURCE ROCKS OF THE NOTHERN PART

OF THE ARABIAN PLATE (p. 34)

Kiseleva Nadezhda Lvovna

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

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

e-mail: nadine_cool@mail.ru.

The northern part of the Arabian plate, covering about 1,5 % of the territory and population of the Earth, has technically recoverable resources of the planet in the amount of 40 % of oil and 20 % of gas. Data on unconventional shale hydrocarbon resources are almost absent. In this paper, you can see an analysis of factual information about oil-and-gas source rocks of the northern part of the Arabian plate, reported in the monograph "Geology of Iraq" (2006). Based on the data about the stratigraphy, lithology and hydrocarbon systems it is possible to allocate 22 oil-and-gas source formations in this region.

Key words: Arabian plate; oil-and-gas source rocks; shale hydrocarbons.

Order this article in the electronic library

UDC 622.276

ACCURACY EVALUATION OF THE QUANTITATIVE PETROPHYSICAL FORECAST

OF TERRIGENOUS ROCKS PERMEABILITY (p. 38)

Blinova Ekaterina Yurievna

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

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

e-mail: eublinova@ya.ru

An approach to accuracy evaluation of the quantitative petrophysical forecast for permeability is presented. An adequacy of permeability heterogeneity reproduction within separate reservoir intervals is examined by the Dykstra – Parsons variation coefficient and the root-mean-square relative deviation of simulated permeability values from core data. The significant advantage of permeability prediction based on the effective porosity and the reservoir total water retention factor is demonstrated vs traditional methods.

Key words: permeability; heterogeneity; the Dykstra – Parsons variation coefficient; open porosity; effective porosity; the reservoir total water retention factor.

Order this article in the electronic library

UDC 550.832+552.54

REVISED PRODUCTIVITY OF SULFATE-CARBONATE ACCUMULATIONS

OF DENGIZKUL GAS-CONDENSATE FIELD OF UZBEKISTAN (p. 44)

Akimenko Svetlana Sergeevna, Bochkarev Vitaliy Аnatolievich

"LUKOIL Overseas Service BV"

Dubai Properties Group Headquarters building, TECOM, P.O. Box 500551,

e-mail: Vitaliy.Bochkarev@lukoil-overseas.com

The article raises the problem of productivity diagnosis of sulfate-carbonate pack (SCP) reservoirs of subsalt Upper Jurassic deposits, hitherto considered hopeless, in Khauzak-Shady area. Because of morphology specific features and SCP collectors’ composition, the necessity of making the interpretation model complicated is highlighted and some variants of the problem salvation are suggested to obtain reliable results. Sedimentation conditions justified presence in various facies zones of different types of collectors with significantly varying reservoir properties, both in the area and in the carbonate massive section, predetermining presence of hydro-dynamically unrelated or partially related hydrocarbon deposits in various rhythm-stratigraphic packs. While assessing SCP collectors’ efficiency with increased tar content, distorting the true values of the coefficients of rocks gas saturation attention should be paid to the component composition of formation waters containing high concentrations of boron oxide and indirectly expressed in abnormal readings of neutron logging as one more sign of the for mation water saturation. The proposed new methodical approach to productivity estimation of SCP collectors allows assessing their reservoir properties and the nature of saturation with a high degree of reliability. This can serve the basis for the new approach recommendation for practical use both at the stage of perforation objects planning and while conducting hydrocarbon reserves evaluation at SCP area of Khauzak-Shady field and adjacent fields.

Key words: sulfate-carbonate pack; promising; rhythm-stratigraphic principles; tar; interpretation model; gas effect; component composition of formation waters.

Order this article in the electronic library

UDC 622.276.031:532.51(1-04)

THE TECHNIQUE OF DETERMINATION OF ABSOLUTE MARKS CORRECTIONS

IN DIRECTIONAL WELLS AND OIL-WATER CONTACT OF A MULTI-LAYER FIELD (p. 49)

Kuznetsov M.A., Cherkovsky N.L., Bakhtiyarov G.A.,

JSC "Slavneft-Megionneftegaz"

51, Kuzmin str., 628684, Megion, Khanty-Mansi autonomous territory – Yugra, Russian Federation,

tel.: (346) 434-14-16,

e-mail: odp@mng.slavneft.ru

Sarvaretdinov R.G., Makhmutov A.A.

NPO "Neftegaztechnologia, Ltd."

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

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

е-mail: npo@ngt.ru

The technique of absolute marks determination of wells and oil-water contact (OWC) is aimed at specifying and improving the reliability of the source database of a multilayer oil field to assess the geological reserves and the state of their extraction in active water-flooding mode by creating some new corrected source database. It is shown that the discrepancies in geological reserves assessment are caused by the distortion while determining absolute marks by deviational survey of directional wells (cable extension, errors of wellbore curving measurement, the depth of layers location and wellbore lengthening).

The developed technique and the algorithm to be used for determination of the absolute marks of well bottom area, layers and oil-water contact involves building of a model for definition of allowable corrections for each directional well and values of the absolute marks of top and bottom of multilayer deposit and oil-water contact.

The method is based on building of some comparison model of all absolute marks of layers’ roofs and bottoms, wellheads with calculation of the maximum and minimum elevations of absolute marks from the calculated error for each layer with the boundary of the confident interval revealing some values of individual wells in comparison with the other ones (no less than four).

Key words: deviational survey; directional wells; absolute mark; oil-water contact; error calculation.

Order this article in the electronic library

UDC 622.276.031:532.51(1-04)

THE METHOD OF ABSOLUTE MARKS DETERMINATION IN DIRECTIONAL WELLS

AND OIL-WATER CONTACT IN FIELD CONDITIONS (p. 52)

Cherkovsky N.L., Bakhtiyarov G.A.

JSC "Slavneft–Megionneftegaz"

51, Kuzmin str., 628684, Megion, Khanty-Mansi autonomous territory – Yugra, Russian Federation,

tel.: (346) 434-14-16,

e-mail: odp@mng.slavneft.ru

Sarvaretdinov R.G., Makhmutov A.A.

NPO “Neftegaztechnologia, Ltd.”

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

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

е-mail: npo@ngt.ru

Application of the calculation method, based on the new methodology, in field conditions allows accepting corrections on absolute marks for directional (horizontal) wells, which take into account both the compliance of all layers to the accepted values of the oil-water contact (OWC), the surface structure and the statistical error of absolute marks determination by deviational survey.

The method is cost-effective, as previously the problem was solved and performed manually. Labor efforts as per the developed algorithm while revising and processing the database with the fund including more than 1000 wells are 17 times reduced, and what is most important accuracy of geological reserves calculation suffers 5...8 % increase. The calculation program is in the collections of the NPO "Neftegaztechnologia, Ltd.”.

Key words: directional well; geological resources; oil-water contact; absolute marks.

Order this article in the electronic library

UDC 622.276.1/.4(571.1)

ANALYSIS OF THE STATE OF OIL RESOURCES EXTRACTION OUT OF FORMATIONS

OF POKURSKY SUITE (p. 54)

Fedorova Ksenia Vladimirovna, Krivova Nadezhda Rashitovna,

Kolesnik Svetlana Vladimirovna, Reshetnikova Daria Sergeevna

Tyumen State Oil and Gas University

5, Lenin str., 628600, Nizhnevartovsk, Tyumen region, Russian Federation,

tel./fax: (346) 663-18-43, (346) 624-33-34,

e-mail: fed-xuh@mail.ru, nrkrivova@rosneft.ru

The article discusses some specific features of development of Pokursky suite of Van-Egan field, which are caused by its complex geological structure. It is proved that such deposits are mainly developed by new wells drilling and sidetracking. The problems that arise when putting wells into operation are analyzed. It is found out that failure to reach the planned production rate occurs due to mud filtrate penetration into the sandstone pore space. The data obtained during carrying out field studies served the basis for building the map of residual oil-saturated thickness which localizes areas with oil residual resources. The analysis of sidetracking performed with usage of various mud solutions that was undertaken in 2012 allowed making a conclusion about feasibility of using some optimized biopolymer mud while drilling new horizontal wells and sidetracks in the areas of remaining reserves localization.

Key words: Pokursky suite; Van-Egan field; complex geological structure; litho-facies analysis; sidetracking; skin factor; mud.

Order this article in the electronic library

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

Main page of journal