Joint reports


A study of the "Productive" and "Red" Series Sedimentary Sequences of the Caspian Sea, Offshore Azerbaijan and Turkmenistan, with Biofacies / Chemstrat Correlation


  • The executive companies: GIA / Geochem Group Limited
  • The year of publication: September 1998
  • Code: # 97/1529/001/003/004/01
  • Volumes: total 5
    volumes with appendixes in same amount: 5




EXECUTIVE SUMMARY


The onshore South Caspian region of Azerbaijan and Turkmenistan has a long history of oil exploration that goes back to the very earliest days of the hydrocarbon age. For a brief period in the early part of the 20th Century, oil production from Baku exceeded tha from the whole of the USSR. Huge quantities of oil estimated at over 1.7 billion tons have been extracted from this region over the last 100 years.


However, the development of the oil resources of the South Caspian offshore region is still in its infancy. Industry predictions suggest that the potential of the Caspian offshore may exceed 28 Gb (Gb=billion barrels), the equivalent of over one year world demand, with peak production of 32 Mb/d by the year 2025 (Campbell, 1998).


Unitl recently the hydrocarbon system of the South Caspian region was only poorly understood. Considerable advances to the understanding of the source rock and generation of hydrocarbons has arisen from non-exclusive industry studies and publications already completed by the Geochem Group and the Geology Institute of Azerbaijan. Since 1997 the geological literature on the region has improved considerably following publication of various summary papers.


The South Caspian Basin has a geological history that dates back only to the Oligocene, overlying Basement dated as old a Early Jurassic. However, most of the sediments within the basin are dated as no older than Late Neogene, even though a sedimentary section of up to 25-30 km is known. This is a seismically active region that is in the early stages of continental collision, and sedimentation rates since the Early Pliocene are amongst the highest ever recorded for a sedimentary basin. Very high sedimentation rates do not provide the optimum conditions for microfossil preservation and the entire drilled reservoir section may occupy less than the span of one microfossil zone. "Conventional" biostratigraphy cannot therefore be undrertaken on the sedimentary section. Separation of depositional units and criteria for correlation have been mainly based on wireliness to date.


Sedimentary packages in different areas of the South Caspian Basin have been deposited from separate river systems, leading to further prblems of sequence characterization and correlation.


The present study attempts to address some of these problems using techniques of biofacies subdivisions on the basis of reworked (recycled) microfossils and chemostratigraphy that have not previously been applied to the section.


The study also benifits from the inclusion of large amounts of prevously unreleased geological and geophysical data.


Interpreted seismic profiles and field maps showing the location of closures in relation to structural separation within fault compartments are available for most of the fields. These data, as typical for the former Soviet Union, come in a variety of vintages and quality. Electric logs are available for all of the fields that also come fom an initial databases of variable grade. All of these dta have been scanned and redigitised, where necessary, to provide an up to date exploration compendium of standartized high quality information, most of it also available on CD.


This study is an invaluable resource base for operations interested in becoming involved in the future exploration of the South Caspian Basin. The undeveloped hydrocarbon resources of the South Caspina have been put on a par by some pundits with those of Saudi Arabia. It is a region that no recognized operator will be able to ignore in the early years of the new millennium.


CONTENTS

 

 

VOLUME 1


EXECUTIVE SUMMARY

 

 

1. INTRODUCTION
1.1 STUDY BRIEF
1.2 REPORT LAYOUT AND PERSONNEL
1.3 BRIEF HISTORICAL BACKGROUND
1.4 STUDY DATABASE
1.5 GEOLOGICAL SETTING
1.5.1 Plate Tectonic Setting and Origin of the South Caspian Basin
1.5.2 Basin Limits
1.5.3 Sediment Fill of the South Caspian Basin
1.6 STRATIGRAPHICAL SCHEMES
1.6.1 Introduction
1.6.2 Regional Stratigraphy, Mesozoic / Cenozoic; Jurassic; Cretaceous; Tertiary
1.6.3 Stratigraphy of the Productive Series and Red Series

 


2. INTEGRATED GEOLOGICAL AN DGEOPHYSICAL DISCUSSION
2.1 INTRODUCTION
2.2 SEISMIC PROFILES OF FIELDS
2.2.1 Gyuneshli Field
2.2.2 Chirag Field
2.2.3 Azeri Field
2.2.4 Promezhutochnaya Field
2.2.5 Livanov West Field
2.2.6 Livanov East Field
2.2.7 Barinov Field
2.2.8 Gubkina Field
2.2.9 LAM Field
2.2.10 Zhdanov Field
2.3 DEPOSITIONAL ENVIRONMENT
2.4 CORRELATION
2.4.1 Correlation framework
2.4.2 Productive Series
2.4.3 Red Series
2.5 SEQUENCE ANALYSIS
2.6 HYDROCARBON PROSPECTIVITY
2.6.1 Source rocks
2.6.2 Reservoir rocks
2.6.3 Traps
2.6.4 Seals

 


3. STRATIGRAPHICAL RESULTS
3.1 INTRODUCTION
3.2 BIOSTRATIGRAPHY
3.2.1 Introduction
3.2.2 Gyuneshli Field
3.2.3 Chirag Field
3.2.4 Azeri Field
3.2.5 Promezhutochnaya Field
3.2.6 Livanov Field
3.2.7 Livanov East Field
3.2.8 Barinov Field
3.2.9 Gubkina Field
3.2.10 LAM Field
3.2.11 Zhdanov Field
3.3 CHEMOSTRATIGRAPHY
3.3.1 Introduction
3.3.2 Statistical Sample Screening
3.3.3 Discriminant Function Analysis
3.3.4 Discussion of Statistical Result
3.3.5 Summary

 


4. GEOCHEMISTRY
4.1 INTRODUCTION
4.2 SOURCE ROCK INTERPRETATION PARAMETERS
4.2.1 Organic Facies and Source Richness
4.2.2 Thermal Maturity
4.3 INDIVIDUAL WELL INTERPRETATION
4.3.1 Well Azeri-1
4.3.2 Well Azeri-4
4.3.3 Well Azeri-5
4.3.4 Well Barinov-4
4.3.5 Well Chirag-1
4.3.6 Well Chirag-4
4.3.7 Well Gubkina-5
4.3.8 Well Gubkina-10
4.3.9 Well Gyuneshli-1
4.3.10 Well Gyuneshli-18
4.3.11 Well Gyuneshli-4
4.3.12 Well LAM-19
4.3.13 Well lAM-24
4.3.14 Well LAM-26
4.3.15 Well Livanov-2
4.3.16 Well Livanov-5
4.3.17 Well Livanov-6
4.3.18 Well Promezhurochnaya-1
4.3.19 Well Zhdanov-32
4.3.20 Well Zhdanov-36
4.3.21 Well Zhdanov-6
4.4 CONCLUSIONS

 


5. PETROGRAPHY
5.1 INTRODUCTION
5.2 LITHOLOGY
5.2.1 Gyuneshli Field
5.2.2 Chirag Field
5.2.3 Azeri Field
5.2.4 Livanov Field
5.2.5 Livanov East Field
5.2.6 Barinov Field
5.2.7 Gubkina Field
5.2.8 LAM Field
5.2.9 Zhdanov Field
5.3 DEPOSITIONAL ENVIRONMENT
5.4 DIAGENESIS
5.5 RESERVOIR QUALITY
5.5.1 Gyuneshli Field
5.5.2 Chirag Field
5.5.3 Azeri Field
5.5.4 Livanov Field
5.5.5 Livanov East Field
5.5.6 Barinov Field
5.5.7 Gubkina Field
5.5.8 LAM Field
5.5.9 Zhdanov Field
5.6 FACTORS CONTROLLING RESERVOIR QUALITY

 


6. CONCLUSIONS

 


7. REFERENCES
FIGURES
VOLUME 2
APPENDICES


  1. Listing of studied sample material
  2. Chemical stratigraphy methodology
  3. Chemical stratigraphy data
  4. Lithological description of samples analysed for chemical stratigraphy
  5. Thin section descriptions and photomicrographs
  6. SEM data and photomicrographs
  7. XRD data and diffractograms

VOLUME 3


ENCLOSURES

1 Detailed location map of fields and wells, Absheron Sill
2 Regional cross-section of the fields of the Absheron Sill
3A Correlation of the Productive Series
3B Correlation of the Red Series>
4 Correlation between the Productive and Red Series

 


VOLUME 4


5A Palynological distribution chart, Gyuneshli-1
5B Micropalaeontological distribution chart, Gyuneshli-1
5C Nannofossil distribution chart, Gyuneshli-1
5D Stratigraphical summary log, Gyuneshli-1
5D Chemostratigraphy downwell plot, Gyuneshli-1
6A Palynological distribution chart, Gyuneshli-4
6B Micropalaeontological distribution chart, Gyuneshli-4
6C Chemostratigraphy downwell plot, Gyuneshli-4
7A Stratiographical summary log, Gyuneshli-16
8A Palynological distribution chart, Guyuneshli-18
8B Micropalaeontological distribution chart, Gyuneshli-18
8C Nannofossil distribution chart, Gyuneshli-18
8D Chemostratigraphy downwell plot, Gyuneshli-18
9A Stratigraphical summary log, Gyuneshli-83
10A Micropalaeontological distribution chart, Chirag-4
10B Stratigraphical summary log, Chirag-4
11A Stratigraohical summary log, Chirag-5
12A Micropalaeontological distribution chart, Chirag-6
12B Stratigraphical summary log, Chirag-6
13A Palynological distribution chart, Azeri-1
13B Micropalaeontological distribution chart, Azeri-1
13C Stratigraphical summary log, Azeri-1
14A Palynological distribution chart, Azeri-4
14B Micropalaeontological distribution chart, Azeri-4
15A Palynological distribution chart, Azeri-5
15B Micropalaeontological distribution chart, Azeri-5
15C Stratigraphical summary log, Azeri-5
16A Micropalaeontological distribution chart, Promezhutochnaya-1
16B Nannofossil distribution chart, Promezhutochnaya-1
16C Stratigraphical summary log, Promezhutochnaya-1
16D Chemostratigraphy downwell plot, Promezhutochnaya-1

 


VOLUME 5

 
17A Palynological distribution chart, Livanov-5
17B Micropalaentological distribution chart, Livanov-5
17C Stratigraphical summary log, Livanov-5
18A Palynological distribution chart, Livanov-6
18B Micropaleontological distribution chart, Livanov-6
18C Stratigraphical summary log, Livanov-6
19A Palynological distribution chart, Livanov-8
20A Palynological distribution chart, Livanov-12
21A Palynological distribution chart, Livanov East-15
22A Palynological distribution chart, Livanov East-16
23A Palynological distribution chart, Barinov-4
23B Micropalaeontological distribution chart, Barinov-4
23C Nannofossil distribution chart, Barinov-4
24D Chemostratigraphy downwell plot, Barinov-4
24A Palynological distribution chart, Gubkina-5
24B Micropalaeontologoical distribution chart, Gubkina-5
25A Palynological distribution chart, Gubkina-10
25B Micropalaeontological distribution chart, Gubkina-10
26A Stratigraphical summary log, Gubkina-11
28A Stratigraphical summary log, LAM-10
29A Palynological distribution chart, LAM-19
29B Micropalaeontological distribution chart, LAM-19
29C Chemostratigraphy downwell plot, LAM-19
30A Palynological distribution chart, LAM-24
30B Micropalaeontological distribution chart, LAM-24
30C Stratigraphical summary log, LAM-24
30D Chemostratigraphy downwell plot, LAM-24
31A Palynological distribution chart, LAM-26
31B Micropalaeontological distribution chart, LAM-26
31C Chemostratigraphy downwell plot, LAM-26
32A Palynological distribution chart, Zhdanov-6
32B Micropalaeontological distribution chart, Zhdanov-6
32C Stratigraphical summary log, Zhdanov-6
32D Chemostratigraphy downwell plot, Zhdanov-6
33A Stratigraphical summary log, Zhdanov-20
34A Palynological distribution chart, Zhadnov-32
34B Micropalaeontological distribution chart, Zhdavon-32
35A Stratigraphical summary log, Zhdanov-35
36A Palynological distribution chart, Zhadanov-36