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11.05.10-13.05.2010
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Nizhny Novgorod – Privolzhsknedra – Solving working problems
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24.05.10-28.05.2010
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Kazan, Tatarstan – Kazan State University – Geological faculty – Workshop “New developments in the field
geophysics” - participation
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10.06.10-12.06.2010
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Gelendzhik – GNZ FGUP “Yuzhmorgeologia” – Work co-ordination
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25.06.10-30.06.2010
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Novosibirsk – FGUP SNIIGGiMS – Participation in the meeting on results of geological and geophysical works on the line 3-DV
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12.07.10-17.07.2010
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Ukhta, Komi Republic – OOO “Gazprom Pererabotka” – Handing over field data on the Kozhvin area
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15.07.10-17.07.2010
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Orenburg – Administration of “Orenburgnedra” - Defence of 2 prospekts (Borlinsk and Shirokopolsk-Atkarsk areas)
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14.08.10-19.08.2010
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Krasnoyarsk - Administration of Nedra department – Participation in a production meeting
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30.10.10-03.11.2010
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Saint-Petersbourg – VSEGEI – Working meeting on reference lines according to
the letter dated 12.10.2010 N 01-50/1575
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12.12.10-15.12.2010
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Ufa - Bashkirnedra – Defence of the report on the works according to the State contract N 19-326/07 dated 04.04.2007
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28.02.11-02.03.2011
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Gelendzhik – GNU FGU “Yuzhmorgeologia” – Handing over field data
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09.03.11-12.03.2011
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Novosibirsk – “SNIIGGiMS” - Handing over field data on the line 3-DV
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17.05.11-22.05.2011
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Gelendzhik – GNU FGU “Yuzhmorgeologia” – Handing over field data on the prospect of the Anabar-Khatanga saddle
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01.06.11-03.06.2011
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Saint-Petersburg – Sevzapnedra – data discussion
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26.06.11-30.06.2011
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Novosibirsk – “SNIIGGiMS” – Participation in the meeting on the reference line 3-DV (the central section)
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18.07.11-23.07.2011
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Perm – Administration of Permnedra – Meeting on considering offers for the Draft List of Prospects for the State order for 2012
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15.08.11-21.08.2011
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Saint-Petersburg – VSEGEI – Solving production problems on the line 3-DV
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07.11.11-10.11.2011
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Saint-Petersburg – VSEGEI – Participation in the meeting
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RESULTS OF GEOLOGICAL AND GEOPHYSICAL STUDIES IN 2011
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The geological and geophysical works have been carried out in 2011 on 6 prospects.
Main work directions were as follows:
- creation of the State grid of geological and geophysical reference lines – 2 prospects (subjects of inquiry);
- regional exploration for oil and gas – 1 prospect;
- ore minerals exploration and reconnaissance investigations – 1 prospect;
- geologic and geophysical data generalization of exploration for oil and gas on licensed sections – 2 prospects.
Works on 4 prospects have been completed. Final reports on 3 of them have been presented.
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Seismic field operations have been conducted including 2D common-midpoint survey, 2D high-resolution
common-midpoint survey and reflection – common-midpoint-refraction survey.
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I REFERENCE GEOLOGICAL AND GEOPHYSICAL LINES
1. Conducting seismic investigations using methods such as reflection technique, common midpoint method, and
correlation refraction technique on the reference geophysical line 3-DV (the central section)
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Exploration objective was the study of the geologic structure and metallogenic specialization of the northern slope
of the Aldan anteclise and the southern part of the PreVerkhoyansk trough based on the construction of modern depth
geologic-and-geophysical and geodynamic models of the region in the section of the reference line 3-DV (the central part).
The works on the prospect have been completed. Field seismic survey (including CMP and refraction methods), geophysical
data processing, and interpretation have been executed.
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The following has been obtained as a result of works carried out:
1. The time and depth sections on the line 3-DV (the central part) presenting location and character of the main
seismic boundaries and deep faults within the Earth,s crust down to surface of the upper mantle.
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2. The depth geological and geophysical model in the section of the reference geological and geophysical line 3-DV
(the central part).
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3. The depth geological and geophysical model constructed taking account of recent geological and geophysical data
and previous information on the acquired part of the line 3-DV (the southern and central sections).
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4. The depth geodynamic model of the main tectonic structures of Far East within the belt of the reference line 3-DV
(Skovorodino – Tommot - Khandyga).
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5. Depth prediction criteria to detect geological structures which are promising concerning strategic, scarce,
highly liquid raw materials based on generalization and processing of geophysical data on the reference geological
and geophysical line.
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6. Recommendations for organization of regional works within the limits of the main tectonic structures of Far
East taking geological results obtained on the line into account.
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7. The register of the geological and geophysical information “The reference geological and geophysical line 3-DV
(the central part)”.
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8. The final geological report.
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Main geological results
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The depth seismic model of the Earth,s crust and Upper mantle presents them from the Earth,s surface down to the depth of
60 km. In accordance with the wavefield character on a reflection section the platform sedimentary cover and the
crystalline part of the Earth,s crust have been detected, the stratification structure of the Earth,s crust and its
thickness have been determined, the nature of initial stage lay of the cross-cutting and subconcordant tectonic zones
and development of large crust-mantle tectonic zones has been revealed.
The deep faults have been detected on the basis of the extended inclined reflectors. These reflectors often cross
Mohorovicic discontinuity, go away into the mantle and decay within the lower part of the sedimentary cover.
The depth geological and geophysical model on the line 3-DV (the central part) characterizes structural and stratigraphic
positions of the section of the Earth,s crust on the basis of the integrated analysis of the seismic reflection and
refraction sections, the potential fields, the geoelectric cross-section and geological data.
Two regional boundaries, the surface of the crystalline basement and Moho discontinuity, have been detected. The of thickness
of the sedimentary cover and the crystalline part of the basement have been determined. Deep structure of 3 large
tectonic blocks, namely: southern Yakutsk, Yakutsk, and transition zone of the PreVerkhoyansk trough, has been shown.
Geological structures of the Southern Yakutsk, Yakutsk zones and the PreVerkhoyansk trough are distinguished according
to the inner structure of the Earh,s crust on all levels and Moho discontinuity.
Master geological and geophysical model is characteristic of geological structure along the reference line 3-DV
(the southern and central parts, 0-1400 km).
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Depth prediction criteria for detection of promising geological structures have been substantiated, namely:
- areas of relative seismic transparency of the crust – mantle zone interpreted as sections of transit of mantle magmas
into the Earth,s crust;
- substantial multi-level destruction of the crust. This appears in a seismic section in the form of an increased
isotropy of the wavefield due to reworking of the crust by mantle magmas;
- mineralization control of the local depressions, deformations, uplifts and steps of the Moho discontinuity surface
detected in a section and interpreted as zones of the mantle faults which could be possible ways for the fluid flows
into the Earth,s crust;
- detection of deep structures experienced more or less exposure to the mantle fluids and their influence on the
structures of the upper part of the consolidated Earth,s crust down to the depths of 10-15 km;
- detection of structures in upper part of the Earth,s crust to 10-15 km characterized by anomalous velocity, density,
magnetic and electrical parameters relative to the enclosing formations.
Sections showing promise in possible detection of large precious metal, non-ferrous metal, and diamond deposits have been
marked for organization of the medium-scale geological and geophysical studies.
Seismic and depth geological and geophysical models have been prepared to put them on the register of the geological and
geophysical information “The reference geological and geophysical line 3-DV (the central part)”.
The final geological report has been handed over.
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II REGIONAL EXPLORATION FOR OIL AND GAS
3. Carrying out seismic CMP-2D investigation on the Anabar–Khatanga saddle
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Objective of the works was the detection of new promising zones (sections) of oil-and-gas accumulation on the
Anabar–Khatanga saddle to make preparations for licensing them.
As a result the field data have been acquired and the results of their in site processing have been obtained.
Additional processing has been carried out after execution of each ordinary block.
On site processing of CMP data has been carried out with the aid of the processing system ProMAX 2002
(Landmark Graphics Corporation) using the standard procedure set.
The full data set including time sections on the shot lines has been handed over the Customer as the appendix of the
information report on the CMP-2D investigations on the Anabar–Khatanga saddle carried out in 2010-2011.
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III ORE MINERALS EXPLORATION AND RECONNAISSANCE INVESTIGATION
4. Carrying out the high-frequency vibroseis CMP-2D survey to prepare a geological-and-geophysical basis for detection
of deposits of Altaic ore type.
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Purpose of the works was the localization of promising areas with pyritaceous and polymetallic
mineralization showing hidden and overlapped occurrence.
The following has been carried out.
- Field trials on the reference lines in the Rubtsovsk ore region for the CMP-2D survey;
- 2D CMP survey in the Zmeinogorsk and Zolotushinsk regions;
- on site processing of field data;
- computer processing;
- processing with the aid of MDS and “Koskad” systems;
- generation of the interpretational seismic sections on the lines located in the Zmeinogorsk
(lines 091004-1, 091005-2) and Zolotushinsk ore regions at 1:25000 scale;
- generation of the preliminary geologic sections on the lines located in the Zmeinogorsk, Zolotushinsk and Rubtsovsk
(lines 091001-3, 091003-3) ore regions at a 1:25000 scale.
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The interpretational seismic sections have been generated on the lines located in the Zmeinogorsk and Zolotushinsk ore
regions and on the test lines 091001-3 and 091003-3 in the Rubtsovsk ore region. On these sections distinctly laminated,
poorly laminated and mosaic (practically, absence of reflectors) seismic reflecting boundaries have been detected in
accordance with amplitude characteristics, correlation peculiarity, and section tectonic peculiarity. Lithologic-
stratigrafic complexes within the limits of detected structural-formation complexes, taking well data into account,
have been detected according to the legend presented by TsNIGRI. The preliminary geological sections have been built.
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Large faults have been interpreted on the section with “tie” to the 1:50000 geological map taking outcrops into account.
Geologic interpretation of the CMP-2D seismic data has been based on detailed comparison of structural heterogeneity and
wavelet characteristics of the seismic wavefield with geological formations dissected in close proximity to a seismic
line by large number of wells drilled during previous years.
Interpretational seismic sections present location of reflectors role of which are played by differing geological
surfaces, namely: concordant and subconcordant, interformation and intraformation, surfaces of cross-cutting geological
bodies and faults.
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At the same time, dimensions, power, frequency and kinematics of distribution of reflected bins and correlation radius
characterize a homogeneity degree of geological environment allowing separation of inhomogeneous stratified packets from
more homogeneous, according to the structure, subvolcanic and intrusive bodies.
Accordingly, stratified packets, lava streams, cross-cutting subvolcanic bodies, and regions of metasomatism have been
are detected within the seismic field.
Detection of litostratigraphic complexes and delineation of geological bodies while constructing sections have been
executed using thorough comparison of geophysical data with well documentation and geological sections located in
transit of seismic CMP-2D lines.
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Processing of data obtained on the Zmeinogorsk and Zolotushinsk sectios on the basis of the differencial seismics method
(MDS) has been completed. Structural and parametrical sections have been obtained, namely:
S - structural sections of increased resolution for detailed measurements of known ore manifestations;
SG – generalized structural sections to obtain general structural evaluation of study area and match to geologic maps;
A – sections of effective rigidity;
F – sections of effective absorption;
V – sections of MDS effective velocities;
I – sections of interval velocities;
P – sections of effective density.
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Information of MDS processing has been considered on separate lines and arranged according to a parameter indication for
the entire processed area (all S-sections, A-sections etc.). These data, in consideration of geologic information (wells),
have been used to build seismogeologic models on lines and form ore prospect image.
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IV GENERALIZATION OF GEOLOGICAL AND GEOPHYSICAL DATA OF GEOLOGIC EXPLORATION FOR OIL AND GAS
5. Analysis of geological and geophysical data on the 3D CMP survey area.
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Purpose of the works was the refinement of geologic structure of the West-Kayum licensed block.
The works have been completed. Main geological problems have been solved, namely:
1. Seismic facies zoning of pre-Jurassic formations on the West-Kayum licensed area has been carried out.
2. Seismic facies schemes for Jurassic sediments (P0, P, Yu2-3) have been built.
3. The scheme of promising prospects for pre-Jurassic and Jurassic sediments has been generated. Tectonic zoning of the
licensed section has been substantiated using seismic, well, magnetic data.
As a result, integrated geologic, geophysical and geochemical study as well as drilling 4 prospecting wells have been recommended.
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6. Generalization of results of geologic-geophysical study for the southern part of the Liman (Novobogatinsk-Saraishik) block.
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Purpose was the prediction of development of carbonaceous and terrigenous formations within subsalt sediments of the
Liman block and substantiation of their oil-and-gas prospectivity.
The works have been completed. As a result, seismic facies zonation of the southern part of the Liman block on subsalt
sediments, geologic structural and oil geological zonation have been substantiated on the basis of integrated analysis
of gravity, magnetic and seismic data using results of satellite image interpretation.
Substantiated evaluation of oil-and-gas prospectivity of subsalt sediments has been carried out. The recommendation for
further geological exploration in the area of the Liman block have been given.
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