Thermal maturity and hydrocarbon generation modelling for the Lower Rudeis source rock and petroleum system analysis in Garra area, Gulf of Suez Rift, Egypt

Khaled Elmaadawy,Hesham Elbassouny,Samir Raslan

doi:10.21608/jpme.2021.62686.1071

Khaled Elmaadawy, Hesham Elbassouny + Show 1 more

Open Access

https://doi.org/10.21608/jpme.2021.62686.1071

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Abstract

The Lower Rudeis Formation is an active source rock in the Garra region, which is characterized by a good hydrocarbon generative potential. The Lower Rudeis source rock reached the early mature stage in the Middle Miocene Langhian (15.5 Ma) and went through the mid mature stage at 0.9 Ma.. It was generated from a clay source rock, deposited under sub-oxic to oxic conditions and derived from an organic material composed mainly of terrestrial organic material. The Lower Rudeis source rock went through two phases of hydrocarbon generation and expulsion. The first phase occurred from 6.0 Ma to 3.4 Ma, while the second phase started at 3.4 Ma and continued until the present time, with a transformation ratio estimated of 42%. The oil expulsion increased to 16 mg/gTOC and gas expulsion to 40 mg/gTOC, thus the expelled hydrocarbons are mainly composed of mainly gas and some oil. In contrast to the southern province, the Garra region has a single petroleum system which is charged by pre-Miocene and Miocene, Lowers Rudeis, source rocks along vertical and lateral migration routes and the main Kareem-Rudeis reservoirs that were sealed by the Belayim evaporite. The current study is based on the geological, geochemical, biomarker and stable carbon isotope data, which were analyzed, interpreted and presented as burial, thermal and maturity models using the petroleum systems and basin analysis program (BasinMod software).

Highlights

The introduction should briefly place the study in a broad context and highlight why it is important
The geochemical input data needed for the Lower Rudeis source rock are the total organic carbon (2%), current study, the input data to define the curves of hydrogen index (250 mg HC/g TOC) and kerogen tectonic subsidence of some wells include the type III used for the construction of the maturity, beginning age of the events, such as; the formations, generation and expulsion models using the Method of erosions and hiatuses shown in table (1)
The relatively high oleanane (0.24) indicates that the family A oil, was generated from the Tertiary lower Rudeis source rocks and the steranes isomerization and aromatization values indicate that the level of maturity of the oil, reached early mature stage and these results are consistent with the constructed models of the Lower Rudeis source rock, thermal maturity models are validated

Summary

Introduction

The introduction should briefly place the study in a broad context and highlight why it is important. Source rock are the total organic carbon (2%), current study, the input data to define the curves of hydrogen index (250 mg HC/g TOC) and kerogen tectonic subsidence of some wells include the type III used for the construction of the maturity, beginning age of the events, such as; the formations, generation and expulsion models using the Method of erosions and hiatuses shown in table (1). Sources for these data include: composite logs, history model include: lithology, formation tops, internal company reports, as well as the studies of deposition age, hiatus age, eroded thickness, and Rohais et al, (2016) [50] and Evans (1988) [55], which reservoir porosity (Allen and Allen 1990) [54].

20 Sandstones

Results and Discussion

Conclusions