Recognition and interpretation of depositional and diagenetic facies from log facies concept, a case study from the Sarvak reservoir in a giant oil fields, SW Iran

Document Type : Research Paper

Authors

Abstract

Depositional facies and diagenetic features are usually understood by their detailed petrographic studies and core or outcrop description. This study focuses on identification and interpretation of depositional and diagenetic facies from log facies concept in the Sarvak reservoir of a giant oil fields of the Abadan Plain, SW Iran. In order to achieve this, three step approach is used. Firstly core description and thin section study were carried out to determine sedimentary and diagenetic processes in one studied key well with 265 m core and 760 thin-sections. Facies analysis led to the recognition of 12 microfacies representing six facies belts, which are lagoon, shoal, rudist biostrome, slope, proximal and distal open marine. According to the results, it seem that studied interval have been deposited in a carbonate shelf platform. Diagenetic processes include micritization, bioturbation, recrystallization, cementation, dissolution, compaction and fracturing have been affected the Sarvak reservoir after deposition. In this study we introduced diagenetic facies as a method for effective comparison between diagenetic alterations and log facies distribution. Three diagenetic facies were recognized that coincide with intervals with low cementation and dissolution (facies 1), high dissolution (facies 2) and high cementation (facies 3). Secondly, five log facies were identified by hierarchical clustering method. The number of clusters were determined based on dendrogram tree and geological heterogeneity. Comparing the results of log facies distribution with depositional and diagenetic changes, show a good agreement between geological and petrophysical heterogeneity. Finally, identification of depositional facies belts and diagenetic facies after calibration of log facies with this geological properties, were carried out in un-cored wells by log facies approach. The presented approach in this study is effective in highlighting main depositional and diagenetic heterogeneity of the Sarvak reservoir in studied field.

Keywords


منابع
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