Joint reports


Reservoir Quality Study of Clastic Rocks from the South Caspian Basin


  • The executive companies: Geology Institute, Exxon
  • The year of publication: 1996
  • Code: -
  • Volumes: total 4
     volumes with appendixes in same amount: 3

EXECUTIVE SUMMARY


This report is result of an agreement for Scientific Technical Cooperation between Geology Institute of Azerbaijan National Academy of Sciences and Exxon Ventures (CIS). The objective of the Joint Scientific Research study is to help each part better understand the reservoir quality variations throughout the Productive Series and Red Bed Series in the South Caspian Basin by analyzing core samples and supplementary data from potential reservoir units.


The most important stratigraphic interval in the South Caspian Basin from an economic standpoint is the Upper Miocene - Pate Pliocene Productive Series. Over 95% of Azerbaijan discovered hydrocarbons are reservoired in Productive Series rocks. The equivalent aged section in Turkmenistan is called the Red Bed Series. Nearly 100% of Turkmenistan hydrocarbons in the South Caspian Basin are reservoired in these sediments.


Seventy-nine samples from 23 fields ranging in depth from 1,030 to 5,982 meters were provided. This study includes quantitative petrographic, mineralogic and SEM analyses. In addition, Mercury Injection Cappilary Pressure (MICP) were performed on selected samples to gain an understanding of the relationship among pore types, porethroat size and irreducible water saturation. MICROQUANT was used to quantify intragranular porosity and microporosity and to identify their origin and distribution in an attempt to estimate producible porosity.


Numerous supplementary data, including reports, literature and previous data analyses were provided by the GIA. These data were incorporated into this study interpretation to provide more statistical validity to the results. Fine-grained clastic rocks, stratigraphically equivalent to the reservoir samples, were analyzed for ostracods and nannofossils to help delineate the stratigraphic and paleoenvironmental framework of the sedimentary sequence.


CONTENTS

  • LIST OF TABLES
  • LIST OF RESERVOIR QUALITY GRAPHS
  • LIST OF FIGURES
  • LIST OF PLATES


1. INTRODUCTION

1.1 Objectives
1.2 Regional Geologic Setting
1.3 Data Base
1.3.1 Reservoir Data
1.3.2 Supplementary Data
1.3.3 Biostratigraphic Data
1.4 Analytical Program


2. THIN SECTION MICROSCOPE PETROGRAPHY

2.1 Introduction
2.2 Petrography
2.2.1 Texture
2.2.2 Framework Grain Mineralogy
2.2.3 Grain Replacements
2.2.4 Pore-Filling Constituents
2.2.5 Pore System Properties
2.2.6 Porosity Development
2.2.7 Climate and Environment Indicators
2.2.8 Provenance and Petrofacies


3. MICROPOROSITY

4. MERCURY INJECTION CAPPILARY PRESSURE MEASUREMENTS

5. SCANNING ELECTRON MICROSCOPY (SEM)

6. FACTORS CONTROLLING RESERVOIR QUALITY

6.1 Introduction
6.2 Summary
6.3 Deposition Controls
6.3.1 Composition
6.3.2 Texture
6.4 Post-Deposition Controls
6.4.1 Cementation
6.4.2 Burial Conditions
6.4.3 Compaction
6.4.4 Microporosity
6.5 Reservoir Quality vs. Depth


7. REFERENCES

  • APPENDIX 1: PETROGRAPHIC ANALYSIS OF CLASTIC ROCKS FROM THE SOUTH CASPIAN BASIN
  • APPENDIX 2: BIOSTRATIGRAPHY AND CHRONOSTRATIGRAPHY OF PRODUCTIVE SERIES AND RED BED SERIES ROCKS FROM THE SOUTH CASPIAN BASIN
  • APPENDIX 3: SUPPLEMENTARY DATA PROVIDED BY THE GIA