Petroleum geology
Fatemeh Taghizadeh; Khaled Maroufi; Reza Falahat; Ali Opera
Abstract
Objective of this study is to conduct a geochemical assessment over source candidates in the Garangan oilfield using Rock-Eval pyrolysis and vitrinite reflectance to identify factors contributing to the lack of hydrocarbon reserves in the Middle Cretaceous – Early Oligocene petroleum system. Furthermore, ...
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Objective of this study is to conduct a geochemical assessment over source candidates in the Garangan oilfield using Rock-Eval pyrolysis and vitrinite reflectance to identify factors contributing to the lack of hydrocarbon reserves in the Middle Cretaceous – Early Oligocene petroleum system. Furthermore, the impact of mineral matrix retention, inert organic material (OM) and maturity were examined, and the results were used to split TOC and S2 parameters into the oil-prone and gas-prone components. Based on results, Pabdeh formation is an immature rich source, exhibiting the highest levels of active OM. Unexpectedly, OM quantity for the Kazhdumi source rocks is fair, for which contribution from inert OM is substantial. Significant inert OM is also confirmed for the oil/gas-prone upper Dariyan shales and gas-prone Gadvan samples. These characteristics seem to be related to the activities of the Khark-Mish paleo-high during the Cretaceous. Moreover, the Cretaceous intervals show a maturity level equivalent to the preliminary stages of main oil generation phase. Finally, owing to the presence of high-quality reservoir and cap strata, the absence of economical reserves in the Asmari and Bangestan reservoirs of the oilfield is possibly related to mediocre OM quantity and quality, and insufficient maturity of the source candidates.
S. Salehi Rad; S. Sherkati; F. Taati Qoaryem; M. H. Noroozi
Abstract
The Paleozoic sediments are noteworthy for many of petroleum geologists to research within Arabian Plate during last decades. Significant values of oil and gas was generated from the Silurian source rock in this area. This source rock has been modeled by commercial software's (PetroMod and Genex) in ...
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The Paleozoic sediments are noteworthy for many of petroleum geologists to research within Arabian Plate during last decades. Significant values of oil and gas was generated from the Silurian source rock in this area. This source rock has been modeled by commercial software's (PetroMod and Genex) in Saudi Arabia and its maturity proportion determined in various locations. Maturity proportion of this source rock was not characterized truly in Persian Gulf and Zagros foreland basin. Here used geological well data of three drilled wells that one's was penetrated to the Silurian shale (Sarchahan Formation) in Persian Gulf to model and used PetroMod-1D software. These well modeling results and the Saudi Arabia results show that the rate of maturity trend for Silurian shale has increased from Saudi Arabia to Iran, so that the shale is in the recognized gas window in Persian Gulf and over-mature in some part of ZagrosBasin. In Arabian Plate basemental lowlands and highlands exist at the Pre-Cambrian time, therefore cause the maturity of this shale in older highlands than the lowlands area.
