RefInement of Structural Lithofacies of Pirallahi Island and Darwin Banks Based on Comparative Analysis

Author details
  • Azerbaijan State Oil and Industry University, Baku, Republic of Azerbaijan; Institute of Oil and Gas of the Ministry of Education and Science of the Republic of Azerbaijan, Baku, Republic of Azerbaijan
  • Surakhani Operation Company, Baku, Republic of Azerbaijan
  • SOCARNIPI “Oilgas”, Baku, Republic of Azerbaijan
  • Azerbaijan State Oil and Industry University, Baku, Republic of Azerbaijan

Abstract

Currently, an increased interest in the discovery of previously laid down productive horizons in oil and gas fields with a long development period and in the extraction of residual oil leads to deep and thorough investigation, assessment of the mineralogical composition of rocks and lithofacies characteristic based on geological, geophysical, hydrogeological and other data. The deposits of Darwin Bank and Pirallahi Island are located in the eastward of the Absheron Peninsula, in the northwestern part of the Apsheron Archipelago, on the anticline zone of the Absheron Bank, Darwin Bank, Pirallahi Island, "Gurgandeniz". The southeastern periclinal of the Darwin Bank field borders the northern part of the Pirallahi Island field, and these two fields are separated from each other by fracture. Two fields are considered in the research work. These fields considered in the study belong to the class of long-term development fields that are in the final stages of development. These fields from a tectonic point of view belong to complicated (complex) structures. Even though it has been processed since the last century, it contains a large amount of oil reserves. For this reason, the structural and tectonic field structure, lithofacial composition, in-place and recoverable reФserves, development parameters are important. The issue we are considering is the distribution and clarification of lithofacies characteristics of the fields. The neighboring fields of the Darwin Bank and Pirallahi Islands are poorly studied and researched from the lithofacial point of view. We investigated the types of facies for the QD, QA and QaLD series of strata in the fields and compared them by compiling 3D models. As a result, changes were observed both in the areal and vertical directions.

Keywords

fieldsaturationsandstoneclaysiltrockfaciescorrelationfacies modelfaultareapetrophysicalloggingrecoverable reservearchipelagoage.

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Article information

Published
24 October 2025
Issue date
24 October 2025
Issue
Vol. 25, No. 3 (2025)
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