South Turgay (Torgay) Basin

Petroleum Geology of the South Turgay Oil-Gas Basin, Kazakstan

Table of Contents

Introduction...... p. 1
Stratigraphy...... p. 6
... Devonian System....... p. 6
... Carboniferous System...... p. 10
... Permian System...... p. 16
... Triassic System...... p. 18
...... Turin Series...... p. 18
...... Karashilik Series...... p. 23
......... Vishnev Formation...... p. 23
......... Kyzyltu Formation...... p. 23
......... Uzunkol Formation...... p. 23
......... Burluk Formation...... p. 25
... Jurassic System...... p. 26
...... Lower and Middle Jurassic...... p. 26>BR> ......... Chernigov Formation...... p. 29
......... Kushmurun Formation...... p. 29
......... Karagan Formation...... p. 30
......... Dubay Formation...... p. 30
......... Bektas Formation...... p. 34
......... Aybolin Formation...... p. 36
......... Karagansay Formation...... p. 39
...... Upper Jurassic...... P. 41
......... Koskol Formation...... p. 42
......... Akshabulak Formation...... p. 42
... Cretaceous System...... p. 45
...... Continental Cretaceous...... p. 45
......... Neocomian...... p. 45
......... Aptian - middle Albian...... p. 47
......... Upper Albian - Cenomanian...... p. 50
......... Turonian...... p. 51
...... Marine Cretaceous...... p. 54
......... Turonian...... p. 57
......... Coniacian (?) - Santonian - Campanian...... p. 59
......... Maastrichtian...... p. 62
...Paleogene System...... p. 66
...... Marine Paleogene...... p. 66
......... Paleocene...... P. 66
......... Lower Eocene...... p. 66
......... Middle - upper Eocene...... p. 69
......... Upper Eocene - lower + middle Oligocene...... p. 69
...... Continental Paleogene...... p. 72
......... Lower + middle Oligocene...... p. 72
......... Upper Oligocene...... p. 75
... Neogene System...... p. 78
...... Miocene...... p. 78
...... Upper Miocene - upper Pliocene...... p. 82
...... Middle - upper Pliocene...... p. 82
...... Upper Miocene - Pliocene...... p. 84
...... Upper Pliocene - lower Pleistocene...... p. 84
... Quaternary System...... p. 84
Structure...... p. 86
... Regional setting...... p. 86
... Structure of Turgay regional low...... p. 91
... North Turgay depression...... p. 91
... South Turgay depression...... p. 94
Seismic stratigraphy of Aryskum downwarp....... p. 117
Petroleum Geology...... p. 124
... Exploration history...... p. 124
... Organic matter of source beds...... p. 127
... Oil shales...... p. 134
... Oil and gas fields...... P. 137
...... Kumkol gas-oil field...... p. 137
...... Aryskum oil-gas condensate field...... p. 141
...... Akshabulak oil field...... p. 144
...... Kyzylkiya gas-oil field...... p. 148
...... Nuraly gas-oil field...... p. 150
...... Konys oil-gas field...... p. 153
... Overall oil-gas potential of South Turgay depression...... p. 156
Selected References...... p. 159

List of Illustrations

Figure 1. Oil-gas basins and provinces of the Former Soviet Union ...... p. 2
Figure 2. Relief map of portion of Europe, Asia, and Africa ...... p. 3
Figure 3. Geologic map of region of the South Turgay depression ......p. 4
Figure 4. Structural-facies map of Turgay regional low ...... p. 8
Figure 5. Correlation of stratigraphic sections of Carboniferous of Turgay regional low ...... p. 12
Figure 6. Map of distribution of Triassic and Jurassic sedimentary rocks in Turgay regional low ...... p. 19
Figure 7. Geology map on pre-Jurassic surface of north part of Turgay regional low and section along east-west profile ...... p. 21
Figure 8. Composite stratigraphic column of Triassic rocks of Turgay regional low for various depressions ...... p. 24
Figure 10. Composite sections of Jurassic sedimentary rocks of groups of downwarps of the Turgay regional low...... p. 27
Figure 11. Composite stratigraphic column of Jurassic System of Turgay regional low ...... p. 28
Figure 12. Paleogeographic map of Turgay regional low for Early and Middle Jurassic time ...... p. 31
Figure 13 . Stratigraphic section of Jurassic sedi- mentary rocks of Aryskum downwarp ...... p. 35
Figure 14. Stratigraphic sections of Jurassic Karagansay and Akshabulak Formations of Aryskum downwarp ...... p. 40
Figure 15. Composite stratigraphic column of Cretaceous System of Turgay regional low ...... p. 46
Figure 16. Map of distribution of Aptian-middle Albian sedimentary rocks in Turgay regional low ...... p. 47
Figure 17 . Map of distribution of upper Albian- Cenomanian sedimentary rocks in Turgay regional low ...... p. 52
Figure 18. Map of distribution of Turonian sedimentary rocks in Turgay regional low ...... p. 55
Figure 19. Litho-facies map of Turonian marine and lagoonal deposits of Ayat Formation of north of Turgay regional low ...... p. 58
Figure 20. Litho-facies map of Coniacian (?)-Santonian Campanian sedimentary rocks in Turgay regional low ...... p. 60
Figure 21. Litho-facies map of Zhuravlev Formation (Maastrichtian) in Turgay regional low ...... p. 64
Figure 22. Composite stratigraphic column of the marine Paleogene of the Turgay regional low ...... p. 67
Figure 23. Map of location of wells that penetrate Paleogene and lower Eocene sediments ...... p. 68
Figure 24. Map of distribution of Tasaran Formation (middle-upper Eocene) in Turgay regional low ...... p. 70
Figure 25. Map of distribution of Saksaul'-Chegan Horizons (upper Eocene-lower+middle Oligocene) in Turgay regional low ...... p. 71
Figure 26. Composite stratigraphic column of Oligocene continental sediments of Turgay regional low ..... p. 73
Figure 27. Map of distribution of Urkimbay Formation (lower+middle Oligocene) in Turgay regional low ...... p. 74
Figure 28. Map of distribution of Chelkarnurin Forma tion (lower+middle Oligocene) in Turgay regional low ...... p. 76
Figure 29. Map of distribution of Kaydagul Formation and Lisakov Beds (upper Oligocene) in Turgay regional low ...... p. 77
Figure 30. Map of distribution of Tersek Formation (upper Oligocene) in Turgay regional low ...... p. 79
Figure 31. Composite stratigraphic column of the Neogene of the Turgay regional low ...... p. 80
Figure 32. Map of distribution of Miocene sedimentary rocks in Turgay regional low ...... p. 81
Figure 33. Map of distribution of upper Miocene and Pliocene sediments in Turgay regional low ...... p. 83
Figure 34. Map of thickness of sediments filling the Turgay ravine ...... p. 85
Figure 35. Map showing position of Late Paleozoic seaways of Central Asia ...... p. 87
Figure 36. Map showing accreted zones of Asia ...... p. 88
Figure 37. Map showing rigid crustal blocks of Central Asia ...... p. 89
Figure 38. Tectonic map of Central Kazakstan and Tyan-Shan ...... p. 90
Figure 39. Structure map of Turgay regional low on pre-Mesozoic surface ...... p. 92
Figure 40. Structure map of South Turgay depression on pre-Mesozoic surface ......p. 96
Figure 41. Seismo-geologic cross section along line of wells shown in figure 40 ...... p. 97
Figure 42. Geologic cross section through Aryskum downwarp ...... p. 98
Figure 43. Structure map of Aryskum downwarp ...... p. 100
Figure 44. Correlation of Jurassic sediments of Aryskum downwarp on profile shown in figure 43 ...... p. 101
Figure 45. Structure map on reflector at base of sedimentary cover of Kumkol area ...... p. 102
Figure 46. Structure map of Aryskum downwarp ...... p. 103
Figure 47. Cross section of Aryskum downwarp along profile shown in figure 46 ...... p. 104
Figure 48. Structure maps and cross section of Kumkol high ...... p. 105
Figure 49. Structure map of South Turgay depression on base of Mesozoic-Cenozoic cover ...... p. 106
Figure 50. Map of Aryskum downwarp showing position of profile of next two figures ...... p. 107
Figure 51. Seismo-stratigraphic section along profile located on figure 50 ...... p. 108
Figure 52. Seismic time section along profile located on figure 50 ...... p. 109
Figure 53. Map showing oil-gas prospects of South Turgay depression ...... p. 110
Figure 54. Map showing oil and gas fields, structures and favorable exploration areas of South Turgay depression...... p. 112
Figure 55. Paleo-tectonic profiles of South Turgay depression ...... p. 113
Figure 56. Map showing oil-gas provinces and regions of Kazakstan ...... p. 125
Figure 57. Graph showing distribution of kerogens in South Turgay depression and main types of kerogen ...... p. 131
Figure 58. Source beds in South Turgay depression...... p. 135
Figure 59. Symbols used in field descriptions ...... p. 138
Figure 60. Structure map, stratigraphic column, geophysical logs, and cross section of Kumkol gas-oil field ...... p. 139
Figure 61. Structure maps, stratigraphic column, geophysical logs, and cross section of Aryskum oil-gas field ...... p. 143
Figure 62. Structure map, stratigraphic column, geophysical logs, and cross section of Akshabulak oil field ...... p. 145
Figure 63. Structure map on the top of productive horizon Yu-1 of Akshabulak oil field ...... p. 147
Figure 64. Structure map, stratigraphic column, geophysical logs, and cross section of Kyzylkiya gas-oil field ...... p. 149
Figure 65. Structure map, stratigraphic column, geophysical logs, and cross section of Nuraly gas-oil field ...... p. 151
Figure 66. Structure map on the top of the Lower Cretaceous productive horizon of Konys field ...... p. 154

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