Petroleum Geology Atlas

of the

Russian Chukchi Sea

2006 - Dalmorneftegeophysika

Table of Contents

Introduction
Regional geology

• Chukchi Mesozoic fold belt

  • Chaun fold belt

  • East Chukchi massif

  • Superimposed structures

• Geological structure of Wrangel Island

• Northwest Alaska basins

  • Colville basin

  • Hanna trough

  • Hope basin

Structural provinces

• North Chukchi basin

  • Kraevaya flexure

  • North Chukchi high

• North Wrangel basin

  • Peredovoy fold belt

• Long-Chukchi basin

  • Ushakov fold-reverse fault zone

• Chukchi platform

• Mamontov high

• Wrangel-Herald arch

Stratigraphy

• Wrangel Island

• Northeast Chukchi

• North Alaska

• Seismic stratigraphy

  • Ellesmerian sequence

  • Rift sequence

  • Lower Brookian sequence

  • Upper Brookian sequence

Velocity characteristics
Gravity and magnetic fields
Petroleum Geology

• Offshore Alaska drilling results

• North Chukchi and North Wrangel basins
  Long-Chukchi basin

• Prospective areas

  • North Wrangel basin

  • North Chukchi basin

  • Long Chukchi basin

• Resource estimates

Operational risk factors

Conclusions

References

STUDY EXHIBITS

1.1  Study area index map
1.2  Bathymetric map of the study area
1.3  Ice cover limits

2.1  Data coverage map and location of seismic illustrations

3.1  Morphology - Chukchi and Bering Sea continental margins
3.2  Main Phanerozoic structures of the Arctic region
3.3  Map of crustal type and seismicity of the eastern Arctic
3.4  Geological section:  Chaun fold zone
3.5  Geological section: Wrangel Island thrust structures
3.6  Seismic line: northern Hope basin, Herald high, Herald thrust and southern Colville basin fold-thrust belt
3.7  Seismic lines: Hanna trough, Klondike, Burger, Diamond wells
3.8  Seismic lines: Hope basin and Herald arch
3.9  Stratigraphy of Hope basin SOCAL wells

4.1  Tectonic map
4.2  Seismic: North Chukchi buried high
4.3  Seismic: Chukchi platform, N Chukchi basin, Kraevaya flexure
4.4  Seismic: Thrust front and Peredovoy fold belt, N Wrangel basin
4.5  Seismic: Ushakov fold-reverse fault zone
4.6  Seismic : Lower Brookian section, Long-Chukchi basin
4.7  Seismic: Chukchi platform
4.8  Seismic: Mamontov high and North Wrangel basin
4.9  Seismic: Herald thrust front and deformed Ellesmerian

5.1  Geological map: Arctic Ocean and adjacent areas
5.2  Stratigraphic section
5.3  Generalized stratigraphy of Wrangel Island
5.4  Schematic cross section: Cenozoic, Val’karay lowland
5.5  Schematic cross section: Wrangel arch to North Chukchi basin
5.6  Geol-geoph section: Long-Chukchi basin to Wrangel-Herald arch
5.7  Generalized cross section of the Chukchi Sea
5.8  Geotransect: SC90-12, 20 and CH90-1 (Crackerjack well tie)
5.9  Geotransects: SC90-20, 27, SC90-25 and SC90-17, 20, 21
5.10  Geotransects: Lines SC90-30 and SC90-46
5.11  Time structure map: Top acoustic basement
5.12  Depth structure map: Top acoustic basement
5.13  Composite seismic line: Ellesmerian west of Chukchi platform
5.14  Isopach map: Horizon JU (Ellesmerian) to basement
5.15  Seismic line: Ellesmerian expansion on Wrangel-Chukchi high
5.16  Seismic line: Ellesmerian - NW Long-Chukchi basin
5.17  Time structure map: Horizon PU (top Lower Ellesmerian)
5.18  Depth structure map: Horizon PU (top Lower Ellesmerian)
5.19  Isopach map: Lower Ellesmerian
5.20  Seismic facies map: Early Ellesmerian
5.21  Isopach map: Upper Ellesmerian
5.22  Seismic facies map: Late Ellesmerian.
5.23  Depth structure map: Horizon BU
5.24  Seismic isopach map: BU to JU horizons (N Chukchi basin)
5.25 Time structure map: Horizon JU
5.26  Depth structure map: Jurassic Unconformity
5.27  Seismic: Mid-Brookian unconformity, Peredovoy fold belt
5.28  Isopach map: Lower Brookian (BU to mBU)
5.29  Paleogeographic map: Early Brookian
5.30  Time structure map: Seismic horizon mBU
5.31  Depth structure map: Seismic horizon mBU
5.32  Seismic line: Lower and Upper Brookian facies
5.33  Time structure map: Yellow seismic horizon
5.34  Depth structure map: Yellow seismic horizon
5.35  Time structure map: Pink seismic horizon
5.36  Seismic isopach: mBU to Yellow horizons
5.37  Seismic: Clinoforms, Upper Brookian, North Chukchi basin
5.38  Paleogeographic map: Late Brookian
5.39  Seismic isopach map: Yellow to Aquamarine horizons
5.40  Seismic isopach map: Yellow to Pink horizons
5.41  Chronostratigraphic section: Line SC90-30
5.42  Chronostratigraphic section: Lines SC90-17, 20, 21

6.1  Time-Depth curves
6.2  Velocity zone map
6.3  Average velocities along line SC90-11
6.4  Velocity effective (Vef) = f (to) curves
6.5  Average and interval velocities, line SC90-12
6.6  Average and interval velocities, lines SC90-17A, 25
6.7  Average  and interval velocities, line SC90-21
6.8  Average and interval  velocities, line SC90-27

7.1  Gravity map (residual anomalies)
7.2  Gravity profile and model: Line SC90-12
7.3  Gravity profile and model : Line SC90-16A, 16B, 16C
7.4  Gravity profile and model : Line SC90-13
7.5  Gravity profile and model : Line SC90-17, 17A
7.6  Magnetic map (vertical gradient anomalies)

8.1  Index map: Arctic oil and gas basins
8.2  Index map: Fields, offshore wells and Trans-Alaska Pipeline
8.3  Cross section: Chukchi Sea wells to onshore Alaska
8.4  Generation potential vs. organic carbon content for source rocks of Arctic Alaska and the Chukchi Sea offshore
8.5  Thermal maturity from Klondike well
8.6  Organic carbon content, northern Alaska and Klondike well
8.7  Modified Van Krevelen diagrams: Kerogen types, Klondike well versus northern Alaska
8.8  Vitrinite reflectance: Chukchi offshore wells and Peard well
8.9  Map of current oil generation stages
8.10  Map of current gas generations stages
8.11  Oil migration density map (not including wet gas window)
8.12  Oil migration density map (including wet gas window)
8.13  Temperature variation versus subsidence, Chukchi Sea
8.14  Oil migration potential versus depth of subsidence
8.15  Petroleum geology zonation map
8.16  Montage: Structure of the Prudhoe Bay oil field
8.17  Time section: Similarity of line SC90-5 to Barrow arch
8.18  Probable traps, Lower Brookian sequence
8.19  Seismic line: Anticline along the Kraevaya flexure
8.20  Lower Brookian strat and structural traps, Peredovoy fold belt
8.21  Folding and faulting in the Peredovoy fold belt
8.22  Erosional truncation of Ellesmerian, west Chukchi platform
8.23  Prograding clinoforms, upper part of Lower Brookian
8.24  Possible deltaic rocks, lower part of Upper Brookian
8.25  Faulting of Upper Brookian clinoforms
8.26  Regional pinchout of Lower Brookian onto basement
8.27  Possible traps channels, lower part Upper Brookian
8.28  Gentle anticline with seismic anomaly at crest
8.29  Gentle anticlines with possible gas indicators
8.30  Map of seismic waveform anomalies of the study area
8.31  Flower structures in the Lower Brookian
8.32  Dome-like high, southern part Long-Chukchi basin
8.33  Possible traps related to basement highs
8.34  Ushakov reverse/strike-slip fault zone
9.1  Magnitude estimates for large earthquakes, Alaska and Chukchi areas (1786 to 1976)