East and Southeast Parts of North Caspain Depression

East and Southeast Parts of North Caspian Depression

Part 1, Structure and Stratigraphy

TABLE OF CONTENTS

Overview of North Caspian Oil-Gas Province p. 1

. . . .Sub-salt section on the north and west p. 1
. . . .Sub-salt section on the east p. 6
. . . .Sub-salt section on the southeast p. 6
. . . .Sub-salt section on the south p. 7
. . . .Some generalizations on the sub-salt section p. 7
. . . .Lower Permian Kungurian salt p. 7
. . . .Supra-salt section p. 8

Structure of Sub-Salt Paleozoic Rocks of the East and Southeast Parts of the North Caspian Depression p. 9

. . . .Belt of buried arches of the basement in the Astrakhan-Aktyubinsk system of highs p. 9
. . . . . . . . Zharkamysh-Yenbek system of arch highs p. 9
. . . . . . . . Kyzyldzhar arch p. 17
. . . . . . . . Biikzhal arch p. 17
. . . . . . . . Gur'yev arch p. 17
. . . . . . . . Karaton-Prorva zone p. 17
. . . .Belt of peri-cratonal downwarps - Pri-Mugodzhar and South Emba p. 18
. . . .Folded systems of buried Hercynides - South Ural, South Emba, and North Buzachi p. 19

Stratigraphy of the Sub-Salt Paleozoic Rocks p. 21

. . . .Predominantly clastic Riphean-Lower Vendian p. 21
. . . .Upper Vendian molasse p. 21
. . . .Lower Paleozoic clastics p. 21
. . . .Middle Devonian carbonate-clastic complex p. 30
. . . .Upper Devonian graywacke complex p. 31
. . . .Tournaisian - middle Visean p. 32
. . . .Upper Visean - Upper Carboniferous p. 34
. . . .Lower Permian p. 36

Main Stages of Development P. 36

. . . .Riphean - early Vendian stage p. 36
. . . . Late Vendian stage p. 37
. . . .Early Paleozoic (Ordovician - Silurian) stage p. 37
. . . .Middle Devonian stage p. 37
. . . .Late Devonian stage p. 37
. . . .Early Carboniferous stage p. 38
. . . .Oka - Late Carboniferous stage p. 39
. . . .Early Permian stage p. 39

LIST OF ILLUSTRATIONS

Figure 1. North Caspian oil-gas province p. 2
Figure 2. Stratigraphic section of North Caspian depression p. 3
Figure 3. Geologic profiles of North Caspian depression p. 5
Figure 4. Structure map on basement surface of east and southeast parts of North Caspian depression p. 10
Figure 5. Structure map on reflecting horizon P-3 (base of Upper Devonian) p. 11
Figure 6. Structure map on reflecting horizon P-2 (top of Lower-Middle Carboniferous) p. 12
Figure 7. Structure map on reflecting horizon P-1 (top of pre-Kungurian) p. 13
Figure 8. Isopach map of section between P-3 and P-2 p. 14
Figure 9. Isopach map of section between P-2 and P-1 p. 15
Figure 10. Isopach map of section between P-3 and P-1 p. 16
Figure 11. Map of structural zonation of sub-salt sediments of east and southeast parts of North Caspian depression p. 20
Figure 12. Profile I-I along line Gur'yev arch-Tengiz- Yuzhnoye p. 22
Figure 13. Profile II-II along line Biikzhal-Toresay- Mynsualmas p. 23
Figure 14. Profile III-III along line Borzher-Tortkol'- Teresken p. 24
Figure 15. Profile IV-IV along line Severnyy Sarkumak- Severnyy Kindysay-Zhantay p. 25
Figure 16. Profile V-V along line Ashikol'-Akzhar- Tasshiy-Kuantay p. 26
Figure 17. Profile VI-VI along line Kordysyn-Kozhasay- Kokpekty p. 27
Figure 18. Profile VII-VII along line Krykkuduk-Kenkiyak- Kumzhargan p. 28 Figure 20. Correlation chart - Kyzyldzhar arch to Urals - east part of North Caspian deprssion p. 40
Figure 21. Correlation chart - Biikzhal arch to Turan platform - southeast part of North Caspian depression p. 41
Figure 22. Correlation chart - Gur'yev arch to Buzachi arch - south part of North Caspian depression p. 42
Figure 23. Map with transliterated place names Front pocket

Part 2, Oil-Gas Regions and Areas

TABLE OF CONTENTS

Introduction p. 1
Eastern North Caspian oil-gas region p. 3
. . . .Zharkamysh-Yenbek oil-gas area p. 3
. . . . . . . .Kenkiyak field p. 3
. . . . . . . .Bozoba field p. 6
. . . . . . . .Karatyube-Akzhar field p. 7
. . . . . . . .Loktybay field p. 9
. . . .Mugodzhar oil-gas area p. 10
. . . . . . . .Alibekmola gas-oil field p. 10
. . . . . . . .Urikhtau gas-condensate field p. 13
. . . . . . . .Zhanazhol oil-gas-condensate field p. 16
. . . . . . . .Kozhasay gas-oil field p. 19
. . . . . . . .Sinel'nikov oil field p. 22
. . . . . . . .Zanatan oil field p. 24
. . . .Kyzyldzhar predicted oil-gas area p. 26
. . . .Aktyubinsk predicted oil-gas area p. 26
Southern North Caspian oil-gas region p. 27
. . . .Karaton-Tengiz oil-gas area p. 27
. . . . . . . .Tengiz oil field p. 27
. . . . . . . .Korolev oil field p. 34
. . . . . . . .Tazhigali oil-gas field p. 35
. . . .Yelemes oil-gas area p. 36
. . . .Saztyube area p. 37
. . . .Pioner area p. 37
. . . .Yubiley area p. 38
. . . .Severo-Yubiley area p. 38
. . . .Vostochnyy Arman area p. 38
. . . .Ushamola oil-gas area p. 40
. . . .South Emba oil-gas area p. 42
. . . .Gur'yev-Biikzhal predicted oil-gas area p. 43
. . . .South Biikzhal predicted oil-gas area p. 43
Zonal distribution of oils p. 44
References...... p. 45

LIST OF ILLUSTRATIONS

Figure 1. Location of study area p. 2
Figure 2. Schematic zonation map of sub-salt Paleozoic rocks of east and southeast of the North Caspian depression p. 2
Figure 3. Profile of Kenkiyak and Zhanazhol fields p. 5
Figure 4. Vostochnyy Akzhar and Kursay fields p. 8
Figure 5. Alibekmola oil field p. 11
Figure 6. Profile through Urikhtau and Zhanazhol fields p. 14
Figure 7. Profile through Kozhasay field p. 20
Figure 8. Kozhasay gas-condensate-oil field p. 21
Figure 9. Sinel'nikov oil field p. 23
Figure 10. Profile through Tengiz field p. 28
Figure 11. Ravnin oil field p. 41
Figure 12. Map of east and southeast of North Caspian depression on which place names are transliterated Back pocket

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