The Azeri, Chirag, Gunashli (ACG) field is located offshore Azerbaijan.
The reservoirs are multilayered sandstones forming traps within a major anticlinal
structure. Proven crude oil reserves are estimated to contain 5.4 billion barrels of
oil. In the past this area has been studied in regional detail but not at the reservoir
scale with respect to the fluvio-deltaic sediments filling the northern shore of the
ancient South Caspian Sea.
The aim of this study is carried out the sedimentological,
cyclostratigraphical analysis and reservoir characterization of Balakhany X
Formation within the Productive Series which is considered to be one of the
significant producing horizons. To be able to achieve this objective, a 30m thick
section, which is mainly composed of siliciclastics, has been studied in detail on
Balakhany X cores from C01 well Azeri field.
In this study, detailed lithofacies analyses were performed and sandstone,
mudstone, siltstone facies were recognized in the studied interval of the
Balakhany X Formation. Litharenites and sublitharenites sandstones are the most
abundant in the succession. Sedimentological analysis such as grain-size
sphericity, provenance, XRD, SEM and grain surface texture were performed and
their relationship with depositional environment were discussed. The grain size
distribution of the samples along the succession shows distribution of fine to very fine sands. Sorting of sandstones ranges between moderately well to very well
sorted. The provenance analysis of sandstones based on modal analysis of thin
sections related to recycled orogen. According to interpretation of grain size
parameters and grain surface textures analysis the main transporting agent of
sands observed as wind, wave and river agents.
High resolution cyclostratigraphy studies based on cm-m scaled cyclic
occurrences of lithofacies along the measured section were performed.
Milankovitch, sub-Milankovitch and millennial cycles were determined along the
studied section.
The petrophysical analysis revealed good to very good (18 to 24%)
porosity and good permeability (10 to 538mD) in Balakhany X Formation.
The porosity and permeability are affected by both textural and
compositional controls. Grain size distribution along the reservoir section is fine
to very fine sands. Influence of compaction was observed by the fractures and
dissolutions on the sand grains. The calcite cement, grain-size variation, sorting
and compaction are the main factors controlling porosity and permeability.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/3/12609628/index.pdf |
| Date | 01 June 2008 |
| Creators | Binyatov, Elnur |
| Contributors | Yilmaz, Ismail Omer |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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