Volume 10, Issue 2 (Autumn & Winter 2024)
KJES 2024, 10(2): 421-442 |
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Ansari M, Asemani M, Mehrabi B, Ghorbani B. Geochemical evaluation and hydrocarbon potential of the Garau Formation in the Jufair field in Abadan Plain, SW Iran. KJES 2024; 10 (2) :421-442
URL: http://gnf.khu.ac.ir/article-1-2928-en.html
URL: http://gnf.khu.ac.ir/article-1-2928-en.html
1- Kharazmi University
2- Kharazmi University ,m.asemani@khu.ac.ir
3- Research Institute of Petroleum Industry (RIPI)
2- Kharazmi University ,
3- Research Institute of Petroleum Industry (RIPI)
Abstract: (280 Views)
The Abadan Plain is one of the most prolific basins in southwestern Iran and a part of the Mesopotamian Basin. In recent years, exploring new hydrocarbon resources in the region and the occurrence of shared oil fields in this region necessitates comprehensive geological and geochemical evaluations. Despite the significance of the Garau Formation as a key source rock in this region, no detailed study has yet been conducted to evaluate its hydrocarbon generation potential in the Jufair field. This study investigated the geochemical evaluation of the Garau Formation as a candidate source rock in the Jufair oil field in northern Abadan Plain. For this purpose, Rock-Eval pyrolysis analysis was conducted on 14 cutting samples to assess the quantity, quality, and thermal maturity of organic matter. The results indicated that the Garau Formation has an average total organic carbon (TOC) content of 2.2 wt.% and an average hydrogen index (HI) of 303 mg HC/g TOC, which is dominantly composed of mostly marine-type organic matter (i.e., Type II kerogen) with slightly terrestrial organic matter (i.e., Type III kerogen). Hence, the Garau Formation was classified as a good to excellent source rock in the Jufair oilfield. Also, the average thermal maturity of the Garau Formation is equal to the vitrinite reflectance of 0.8%, which implies the peak of the oil window. The matrix effect and inert organic carbon in the Garau Formation were also examined by plotting S2 versus TOC and drawing a regression line. The results showed that the matrix can absorb a significant amount of generated hydrocarbons, equal to 2.5 mg HC/g Rock, highlighting the mineral matrix has an essential role in the geochemical nature of the formation. This study emphasizes that the Garau Formation has played a vital role in charging the overlying reservoir formations in the Jufair oil field.
Keywords: Rock-Eval pyrolysis, Hydrocarbon potential, Source rock, Mineral matrix effect, Jufair oil field.
Type of Study: Original Research |
Subject:
Petroleum Geology
Received: 2024/11/11 | Accepted: 2024/12/13 | Published: 2024/12/28
Received: 2024/11/11 | Accepted: 2024/12/13 | Published: 2024/12/28
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