Hesabatlar
Screening regional evaluation of the South Caspian Basin
2011, GIA – OMV joint study (ingilis dilində)
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Cənubi Xəzərin Azərbaycan sektorunda neft və qaz potensialının müasir vəziyyətinin regional qiymətləndirilməsi
2012, AMEA Geologiya İnstitutu - "Rosneft" ASC, Cild I, II (rus dilində)
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Assessment of the hydrocarbon potential of the Maykopian deposits of the Middle Kura basin and the temperature conditions of its realization (within Azerbaijan)
2015, GIA - ExxonMobile joint study, Cild I, II, III (ingilis dilində)
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Pre-Pliocene Prospectivity Study: Onshore Azerbaijan
- The executive companies: Geology Institute, BP and STATOIL ALLIANCE
- The year of publication: April 1995
- Code: EXT 67373
- Volumes: total 2. Volumes with appendixes in same amount: 1
At present a significant actual material dealing with tectonics and neotectonics of Azerbaijan has been accumulated. A recent tectonic structure of mountain zones of the Greater and Lesser Caucasus, Talysh, Nakhchyvan; deep structure of intermountain and marginal depressions, structure of Pre-Alpine basement and sedimentary cover was studied.
EXECUTIVE SUMMARY
The largely Pliocene "Productive Series" succession of Azerbaijan produces 99% of the hydrocarbons found in the South Caspian Basin to date. However, although exploration efforts have concentrated almost exclusively on the Productive Series, there is minor production in onshore Azerbaijan from the succession beneath the Productive Series (for example from Maastrichtian flysch and from the Maykop Suite (Oligocene - Early Miocene) sands). It has been a long-held belief of many Azeri geoscientists that considerable potential for hydrocarbon discoveries exists in the Pre-Pliocene succession. In order to test this, we visited numerous outcrops in eastern Azerbaijan in order to sample and study potential source and reservoir rocks and to develop structural models. We also reviewed the Pre-Pliocene exploration effort to date. This, in combination with the outcrop data, enabled potential play fairways to be identified and a hierarchy of prospective regions to be presented.
It is clear from both outcrop and well data that there are several horizons in the Pre-Pliocene succession which contain reservoir quality sediments, leading to the recognition of several potential play fairways. These include horizons within the Eocene, Oligocene - Miocene, Late Cretaceous and Early Cretaceous successions. Particular attention has been placed on the potential of the Gobustan region. Here Tertiary and perhaps even Mesozoic sediments are most likely a potential play beneath the imbricate stack of the southern Greater Caucasus, although burial cementation may occlude porosity. At outcrop, potential Cretaceous and Early Tertiary reservoirs (e.g. the Kululin Sandstone and sands within Maykop Suite) contain a high degree of cementation, and individual beds are laterally discontinuous. The best reservoir quality sands seen in Gobustan were those of the Chokrak Horizon (Miocene) (close to where they produce oil at Umbaki). However, their thickness and areal distribution is thought likely to be limited.
Structural cross-sections across Eastern Azerbaijan suggest that anticlinal traps may exist in the autocthon beneath the thrusts of the Greater Caucasus. However, their existence is still the subject of agreement on a structural model for the region. In any case, it seems likely that these traps will be at considerable depth and difficult to recognise on seismic. A simpler option is to explore the existing structures of the Apsheron Peninsula, Kura Valley and southern Gobustan to greater depths in order to test the Maykop Suite, Chokrak Horizon and deeper reservoirs.
A subject of ongoing research is the probable source rock for potential Pre-Pliocene plays. Geochemical analysis of samples collected during field work indicates that the sediments of the Maykop Suite (and especially the lower part) form the best present-day source rocks. Sediments of parts of the Diatom Suite and Middle Jurassic succession also display reasonable present-day source quality. Potential reservoirs within the Tertiary succession may receive a charge from a Maykop Suite source rock. Autocthonous Mesozoic reservoirs may require a Jurassic source rock.
CONTENTS
(i) Executive summary
(ii) Contents List
1. INTRODUCTION
1.1 Aims and Scope of the Study1.2 Methods1.3 Report Organisation1.4 Roles and Responsibilities
2. GEOLOGICAL OVERVIEW
2.1 Geological Setting2.2 Lithostratigraphy/Chronostratigraphy Overview2.3 Major Play Fairways2.4 Geochemistry Overview
3. HYDROCARBON EXPLOITATION
3.1 History of Exploration and Production3.2 Prospectivity Concepts3.3 Onshore Azerbaijan Overview
4. PRE-PLIOCENE PROSPECTIVITY OF GOBUSTAN
4.1 Regional Introduction4.2 Potential Reservoir Horizons4.3 Structural Characteristics4.4 Hydrocarbon Distribution4.5 Hydrocarbon Prospects
5. FUTURE DIRECTIONS FOR HYDROCARBON EXPLORATION
6. SELECTED BIBLIOGRAPHY
- APPENDIX 1: The Joint GIA and the BP and Statoil Alliance Pre-Pliocene Prospectivity Field Trip
- APPENDIX 2: Pre-Pliocene Prospectivity Field Trip Guide
- APPENDIX 3: Pre-Pliocene Prospectivity Field Trip - Biostratigraphic Data
- APPENDIX 4: Summary of "Mesozoic and Cenozoic Phases of Tectonic Movements of the Eastern Caucasus" by Academician E.Sh. Shikhalibeily.