Joint reports


Joint Study of Reservoir Rocks and Source Rocks of Talysh Zone, the Azerbaijan Republic


  • The executive companies: GIA / Amoco
  • The year of publication: February 1997
  • Code: -
  • Volumes: total 1
    volumes with appendixes in same amount: 1



EXECUTIVE SUMMARY


Talysh zone has been an object of long-term exploration, it has been studied from all the aspects: geology, geophysics, pertology and volcanicity, as well as oil and gas content. The objective of the present paper is to study of Oligocene and Miocene deposits of Talysh zone for the purpose of studying reservoir and source properties of the rocks, these deposits consist of, to establish the source of wash-down and the facial pecularities of sedimentation basin.


The present paper is divided into six chapters.


The first chapter contains the information of general character concerning the history of geological and geophysical study of the Talysh zone. The principal results of the research conducted are mentioned, these results used in the process of performing the work under discussion.


The second chapter reflects the Talysh zone geological and tectonic structure according to the data obtained by all the previous explorers. The summary stratigraphic column of volcanogenic and sedimentary units of Talysh is enclosed as well as geological and tectonic map of Talysh, the latter scale being 1:200.000.


The third chapter chapter gives the correlation of Oligocene-Miocene units sections within Yardymly and Jalilabad sinclinoria. This chapter is made up of data, available from published literary sources, the sections of the above units being used. The above sections were sampled and described by the authors of the present report. In the process of the sections zonation and correlation the results of the gathered macrofauna and microfauna definition were used, as well as the data concerning lithology and radioactivity. In the process of correlation the material obtained from wells # 3, 6, 7, 8 and 9 (including log diagrams from wells # 3, 6 and 9), drilled in the near Novogolovka village (South-Mugan uplift). The summarized material concerning the units correlation is presented graphically in the form of columns, the scale being 1:5.000; the results obtained being used in the last chapter, telling about the dynamics of these distribution within structyral zones.


The fourth chapter consists of four parts:

  1. Lithological and physical characteristics of the units rocks, this characteristics being based upon the results of the study cencerning petrography, granulometric composition and mineralogical composition of the rocks, as well as their physical parameters - carbon content; porosity and permeability.
  2. Petrographic description of facial differences of Oligocene-Miocene units rocks.
  3. Radioactivity of rocks


The obtained data concerning the rocks structure and texture, composition and state of clastic material, the level of the rocks grains roundness and sortedness, the presence of fauna, as well as the authigenous minerals composition and the cementation character, are usedwhile considering the conditions of the units formation and while making paleogeographic reconstructions.


The fifth chapter is dedicated to the dynamics of Oligocene-Miocene units distribution about North-Talysh and fore-Talysh zones. This chapter is compiled on the basis of the data obtained by analysis of studied units different facies and thicknesses distribtuion within Yardymly and Jalilabad sinclinoria. For this purpose geodynamic profiles are built for specific periods of time, maps of thicknesses and facies are made for Oligocene-Miocene and Sarmat periods, these maps covering also the issue of sea and landre relationship, wash-down sources and sedimentation conditions in the process of the region formation.


The sixth chapter considers the issue of oil and gas bearing capacity in the region. The chapter is based upon th edata obtained for the study of wildcats and exploratory wells, drilled in North-Talysh zone in different years. As a result of this study we could find out oil horizons confinement to Chockrak and Sarmat deposits, this chapter is compiled on the basis of analysis of data concerning the rocks reservoir properties and probability of oil and gas accumulation there.


The work is completed with conclusions and the list of literature sources.


CONTENTS


Chapter 1. Histiry of Geological and Geophysical Studies in Talysh


Chapter 2. Geological and Geophysical Constructions


Chapter 3. Correlation of Oligocene-Miocene Deposits of Talysh and fore-Talysh zones


Chapter 4. Lithological and Physical Characteristics of Oligocene and Miocene units of Talysh


Chapter 5. Geodynamic Environment of forming Cenozoic units of Talysh


Chapter 6. Some issues of oil and gas content of the region


Conclusions


Literature