Microfacies and depositional model of the Lower Mahil Formation (outcrop Khuff-equivalent (KS-1)) in Jabal Akhdar, Northern Oman: Implications for reservoir characterization

Raqaishi, Rasha Ali Al; Moustafa, Mohamed S.H.; El‐Ghali, Mohamed A.K.; Abbasi, İftikhar Ahmed; Al-Awah, Hezam; Sarmi, Musaab Shakir Al; Al-Sayigh, Abdul Razak; Al-Shukaili, Marwa

doi:10.1016/j.marpetgeo.2022.106066

Cited by 4 publications

(5 citation statements)

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“…The Th/U ratio suggests oxidizing conditions during regression phases or near sequence boundaries, while the Th/K ratio indicates sudden depositional changes and potential diagenetic alterations (Serra, 1984;Doveton, 1991;Glover, 2000). In both sections, K values are nearly zero due to the absence of evaporative conditions in the Lower Mahil Formation (Al Raqaishi et al, 2023).…”

Section: Spectral and Total Gamma-raymentioning

confidence: 98%

“…The log provides information on the height, lithology, texture, sedimentary features, sample locations, fossils, microfacies, and distribution of lithofacies associations. Refer to the legend provided for further details and explanations [modified from (Al Raqaishi et al, 2023)].…”

Section: Figurementioning

confidence: 99%

“…The depositional model of the Lower Mahil Formation depicts a broad epeiric homoclinal carbonate ramp extending from shallow-subtidal to relatively deep-subtidal environments (Figure 9). The microfacies interpretations within this formation are categorized into three primary lithofacies associations, organized in order from proximal to distal according to (Al Raqaishi et al, 2023). These lithofacies association listed below from shallow-subtidal to relatively deep-subtidal environments.…”

Section: Depositional Modelmentioning

confidence: 99%

“…FIGURE 5Legend for the sedimentological logs of the Saiq Plateau and Wadi Sahtan sections, Lower Mahil KS-1 Formation, Northern Oman [modified from(Al Raqaishi et al, 2023)]. …”

mentioning

confidence: 99%

“…Summarizes the breccia-dominated lithofacies, microfacies, and their lithofacies association within the Lower Mahil KS-1 Formation in Jabel Akhdar. The information in the table has been modified from the research conducted by(Al Raqaishi et al, 2023).…”

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confidence: 99%

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Gamma-ray, stable carbon and oxygen isotope chemostratigraphy and sequence stratigraphy of the Lower Mahil Formation (KS-1 Khuff-Equivalent), Northern Oman

Moustafa,

Al Raqaishi,

El-Ghali

et al. 2023

Front. Earth Sci.

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This research presents findings from a study focused on the Lower Triassic (Induan) Lower Mahil KS-1 Formation, situated on a homoclinal carbonate platform in Northern Oman. The sequence stratigraphy of this formation is characterized by a considerable thickness variation, slumps, and breccia deposits related to active normal faults coupled with intra-basin growth faults. The main objective was to establish a reliable stratigraphic framework for the Lower Mahil KS-1 Formation by integrating high-resolution carbon isotope data along with high-resolution spectral and total gamma-ray data. To achieve this, whole-rock samples were analyzed for δ13C and δ18O isotopes. Spectral and total gamma-ray records were obtained for the formation. Isotope sampling is conducted every 0.5 m in the Saiq Plateau and Wadi Sahtan sections. Furthermore, spectral gamma-ray measurements were taken at intervals of 10 cm from the logged sections. Within the third-order sequence, the spectral gamma-ray data revealed a distinct sea-level trend, leading to the division of KS1 into two different parts. Five fourth-order depositional sequences were identified by analyzing stable carbon isotopes, uranium, and total gamma-ray profiles. Four of these sequences displayed complete patterns, reflecting transgression and regression phases, while the fifth sequence was incomplete and solely comprised a transgressive phase. An essential outcome of the study is the correlation of the δ13C curve of the Lower Mahil KS-1 Formation with other similar formations around the Tethys region. This correlation indicates that the Lower Mahil KS-1 Formation captures the near-primary signal of carbon isotope variations in coeval seawater. As a result, it holds promise as a reference section for future investigations and studies in this field. Compared to the prior investigation, this study utilizes data with higher precision, capturing spectral gamma-ray measurements at 10 cm intervals and isotope measurements at 50 cm intervals. Furthermore, the study’s focus is confined explicitly to KS1.

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Section: Spectral and Total Gamma-raymentioning

confidence: 98%

Section: Figurementioning

confidence: 99%

Section: Depositional Modelmentioning

confidence: 99%

“…FIGURE 5Legend for the sedimentological logs of the Saiq Plateau and Wadi Sahtan sections, Lower Mahil KS-1 Formation, Northern Oman [modified from(Al Raqaishi et al, 2023)]. …”

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confidence: 99%

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