Joint reports

Hydrocarbon Prospectivity of North-Eastern Azerbaijan

  • The executive companies: GIA / First Exchange Corporation
  • The year of publication: March 1997
  • Code: FEC 3082
  • Volumes: total 2
    volumes with appendixes in same amount: 2


Most of the geological studies so far carried out by western oil companies and consultancies have focused on either the highly prospective main Apsheron Trend or the Kura Basin. This study has concentrated on the area of Northeastern Azerbaijan and adjacent offshore area to the east of the Greater Caucasus, between the Apsheron Peninsular and the Dagestan Border. This area includes the Siazan producing oilfield and a large number of "prospective structures".

In this area hydrocarbons occur in a number of deeper horizons including the early Tertiary, Cretaceous and Jurassic. Little is presently available about the hydrocarbon potential of these deeper intervals, although a Pre-Pliocene Prospectivity Study previously carried out by the GIA in collaboration with the BP/Statoil Alliance (and now being marketed by First Exchange/GIA) has highlighted some of the potential. This report has built on that earlier work by incorporating new well and seismic data, extending the analysis of the reservoir potential of key outcrops, and providing detailed petrographic studies. The latter are based on the GIA core collection which contains the only remaining core samples in the area, supplemented by selected outcrop material. It includes full modal analysis, grain size distribution, diagenetic history and reservoir quality. In addition, geochemical modelling has been carried out in order to assess the maturation history of various potential source rocks. Also included in the study are published and unpublished Russian data on reservoir quality and on the exploration history of the fields and prospective structures.

These analyses have been been used to provide a classification of the main hydrocarbon plays and an initial assessment of the remaining potential.


  1. Well data from offshore and onshore fields including electric logs and cores.
  2. Descriptions of onshore outcrops in the Jurassic, Cretaceous and early Tertiary.
  3. Seismic data.
  4. Geochemical Data.
  5. Published and unpublished Russian data.


The report consists of two volumes:

Volume I (A4) Text and Appendices

Volume II (A3) Figures, Enclosures and Appendices

All figures and enclosures are in colour and available in digital form. All tables are available in digital form (Excel). All well logs have been digitised and are available in LAS format, as scans of the original Russian logs and as composite logs (1:500 scale).

  • Stratigraphic Correlations
  • Detailed petrographic studies of selected core and outcrop material (60 thin sections)
  • Outcrop descriptions and graphic logs (Early Tertiary to Mesozoic) with sedimentological and sequence-stratigraphic interpretation
  • Representative seismic sections (scanned and re-plotted)
  • Structure maps and cross sections
  • Geochemical modelling (Basinmod)
  • Synthesis of tectonic, stratigraphic and sedimentological evolution
  • Summary of available porosity and permeability data
  • Summary of all known hydrocarbon discoveries and ‘prospective structures’
  • Synthesis and evaluation of hydrocarbon prospectivity


This project is a joint study between the following organisations:




The main evaluation has been carried out by Dr. Colin Jonesof Collinson Jones Consulting Ltd (UK). For the past 9 years he has carried out a number of studies in the North Sea, the North Caucasus and Kazakhstan. Before that he was a Senior Geologist with BP and Britoil. The petrographic work has been carried out by Dr. Giancarlo Rizzi of Core Carbonates (UK). Geochemical modelling has been undertaken by OceanGrove Geoscience in Aberdeen and Geochem Group (Chester, UK) have undertaken a further oil analysis.

A number of geological specialists from the GIA (Sedimentary Geology, Geochemistry and Oil and Gas divisions) have also worked on the study or provided advice and expertise on the local geology, availability and interpretation of data, and logistical support in the field.


Executive Summary

Chapter 1 Introduction

1.1 Scope and Aims of Study

1.2 Methodology

1.3 Personnel

1.4 Geography and Infrastructure

Chapter 2 Stratigraphy and Tectonic Evolution

2.1 Tectonic Elements and Structure: Onshore

2.2 Tectonic Elemts and Structure: Offshore

2.3 Stratigraphic Background

2.4 Mesozoic Stratigraphy and Tectonics

2.4.1 Lower - Middle Jurassic

Upper Jurassic

2.4.3 Latest Jurassic (Tithonian) to early Lower Cretaceous (Berriasian)

2.4.4 Lower Cretaceous (Valanginian to Albian)

2.4.5 Upper Cretaceous

2.5 Tertiary (pre-Pliocene) Stratigraphy

2.5.1 Palaeocene (Sumgaiet Suite)

2.5.2 Eocene (Koun Suite)

2.5.3 Oligocene-Early Miocene (Maykop)

2.5.4 Middle Miocene (Spireilis Beds)

2.5.5 Miocene-Late Miocene (Diatom Suite)

2.5.6 Late Miocene (Pontian)

Chapter 3. Reservoir Geology


3.2 Sedimentology and Depositional Systems

3.2.1 Lower- Middle Jurassic

3.2.2 Upper Jurassic

3.2.3 Latest Jurassic (Tithonian) to early Lower Cretaceous (Berriasian)

3.2.4 Lower Cretaceous

3.2.5 Upper Cretaceous

3.2.6 Paleocene-Eocene

3.2.7 Oligocene-Early Miocene

3.2.8 Mid-Late Miocene

3.3 Petrography and Reservoir Quality

3.3.1 Jurassic

3.3.2 Lower Cretaceous (Berriasian- Hauterivian)

3.3.3 Lower Cretaceous (Aptian-Albian)

3.3.4 Upper Cretaceous

3.3.5 Eocene

3.3.6 Oligocene

3.3.7 Miocene

3.4 Summary and Conclusions

Chapter 4. Hydrocarbon Prospectivity

4.1 Introduction

4.2 Source Rocks and Maturity

4.3 Reservoirs and Seals

4.4 Prospectivity of the Precaspian-Guba Region

4.4.1 Introduction

4.4.2 Siazan Oilfield

4.4.3 Talaby Gaynarja Trend

4.4.4 Structural Highs

4.5 Prospectivity of the Mesozoic Fold Belt

4.6 Prospectivity of the Offshore Area (Pre-Productive Series)

4.7 Summary and Conclusions



(Volume I)

Appendix I Field Outcrop Data: Written Summaries

Appendix II Data on Fields and ‘Prospective Structures’

Appendix III Geochemical Data<

Appendix IV Porosity-Permeability Data

(Volume II)

AppendixV Geographical Location of Outcrop Sections, Petrography and Geochemistry Samples.

Appendix VI Petrographic Data: Modal Analysis, Grain Size and Porosity.

Appendix VII Composite Well Logs

1. Composite Well Log Agzibirchala # 1

2. Composite Well Log Yalama # 14

3. Composite Well Log Khudat # 5

4. Composite Well Log Gusary # 1

5. Composite Well Log Khachmas # 2

6. Composite Well Log Talaby # 14

7. Composite Well Log Zagly # 1253 (Siazan)

8. Composite Well Log Amirkhanly # 1547 (Siazan)

9. Composite Well Log Tekchay # 3

10. Composite Well Log Sitalchay # 3

11. Composite Well Log Shurabad # 14

12. Composite Well Log Gaynarja # 6

Appendix VIII Seismic Data

1. Seismic Shotpoint Map (Onshore)

2. Seismic Line 870708

3. Seismic Line 870208

4. Seismic Line 860108


1.1 Geography

2.1 Tectonic Elements

2.2 Top Mesozoic Structure Precaspian-Guba (Onshore)

2.3 Top Mesozoic Structure Precaspian-Guba (Offshore)

2.4 Structural Cross-Sections

2.5 Top Mesozoic Structure North Apsheron (Offshore)

2.6 Top Chokrakian Structure North Apsheron (Offshore)

2.7 Siazan Structural Cross-Sections

2.8 Main Stratigraphic Units (Mesozoic)

2.9 Correlation of Jurassic sequences in the subsurface

2.10 Main Stratigraphic Units (Tertiary)

3.1 Palaeogeography and Facies: Aalenian to Oxfordian

3.2 Palaeogeography and Facies: Kimmeridgian to Tithonian

3.3 Palaeogeography and Facies: Berriasian

3.4 Palaeogeography, Facies and Isopach: Valanginian

3.5 Palaeogeography, Facies and Isopach: Hauterivian

3.6 Palaeogeography, Facies and Isopach: Barremian

3.7 Palaeogeography, Facies and Isopach: Aptian

3.8 Palaeogeography, Facies and Isopach: Albian

3.9 Palaeogeography, Facies and Isopach: Cenomanian

3.10 Palaeogeography, Facies and Isopach: Turonian

3.11 Palaeogeography, Facies and Isopach: Coniacian

3.12 Palaeogeography, Facies and Isopach: Santonian

3.13 Palaeogeography, Facies and Isopach: Campanian

3.14 Palaeogeography, Facies and Isopach: Maastrichtian

3.15 Palaeogeography, Facies and Isopach: Danian

3.16 Palaeogeography, Facies and Isopach: Palaeocene/Eocene

3.17 Palaeogeography, Facies and Isopach: Maykopian

3.18 Palaeogeography, Facies and Isopach: Chokrakian

3.19 Palaeogeography, Facies and Isopach: Karaganian

3.20 Palaeogeography, Facies and Isopach: Konkian

3.21 Palaeogeography and Facies: Lower and Middle Sarmatian

3.22 Paleogeography, Facies and Isopach: Upper Sarmatian

3.23 Palaeogeography and Facies and Isopach: Pontian

4.1 Map of Producing Oilfields and ‘Prospective Structures’

4.2 Base Maikopian ApproximateDepth

4.3 Depth/Temperature Profile: Siazan Oilfield

4.4 Estimated Temperatures at 500 m

4.5 Estimated Temperatures at 3000 m

4.6 Maturation History: Yalama

4.7 Maturation History: Khachmas

4.8 Maturation History: Gaynarja

4.9 Maturation History: Offshore, East Apsheron Syncline

4.10 Main Hydrocarbon Plays


1. Geoseismic Sections (Offshore)

2. Field Section Correlation Panel (Onshore)

3. Jimichay (Lower-Middle Jurassic) Outcrop Data

4. Kudialchay Gorge (Jurassic-Cretaceous) Outcrop Data

5. Shurabad Village (Upper Cretaceous) Outcrop Data

6. Koun Series (Eocene): Khajy Zeynalabdin, Gobustan, Perekishkul. Outcrop Data

7. Altygach Village Area(Lower Cretaceous) Outcrop Data

8. Gizilgazy Valley (Upper Cretaceous) Outcrop Data