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Thick carbonate platform of the Arabian Plate deposited during the Mesozoic comprises an ideal candidate for investigation of carbonate sequence stratigraphy. For Triassic sections, there are numerous published studies revealing the maximum flooding surfaces and sequence boundaries for the middle and southern parts of the Arabian Plate. However, the northern part, in SE Turkey, has been neglected in terms of Triassic sequences. To fill this gap, this study focuses on the Triassic section by using the power of the SGR logs acquired from the recently drilled exploration wells penetrating the Triassic succession. The advantage of this method is its ability to display depositional environments and regression-transgression cycles based on the 232Th-238U-40K measurements, even though biostratigraphical and lithological data are missing due to operational issues. Examination based on the recently developed open-source Python project, SGR Logs Interpreter Tool (SLIT), has revealed sequence boundaries and maximum flooding surfaces. According to the outcomes, eight sequence boundaries controlled sedimentation during the Triassic. Occasionally, some of the younger sequences disappear from the logs, however, a significant transgression separating Early and Mid-Triassic is consistent for the whole region and can even be observed along the wells drilled in the Western Taurides. The Early Triassic section is characterized by shallow-marine sandstones, siltstones, and shales while transition into the Mid-Late Triassic section favors carbonate platform conditions controlled by limestones, clayey limestones, dolomites, and anhydrites. Two main anhydrite deposition intervals can be easily traced by regressive character at the Northern Arabian Plate while they disappear from the log records at the Western Taurides. On the other hand, maximum flooding surfaces restrict the limits of dolomites. As a conclusion, for the first time, distinguishing of Triassic sequences using SGR logs in the SE Turkey and Mediterranean region has been conducted in this study. Differentiated sequences can be used for to better understand the evolution of Mesozoic platform and opening of the Neo-Tethys Ocean. They also provide invaluable information for the presence and extent of the seal, reservoir, and source rocks of the region.

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Following the Middle Triassic Transgression from the Northern Arabian Plate to the Western Taurides Using 232Th-238U-40 K Concentration Logs

  • 会议论文

  • 发表日期：

    2025年

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  • Ayberk Uyanik

摘要

Thick carbonate platform of the Arabian Plate deposited during the Mesozoic comprises an ideal candidate for investigation of carbonate sequence stratigraphy. For Triassic sections, there are numerous published studies revealing the maximum flooding surfaces and sequence boundaries for the middle and southern parts of the Arabian Plate. However, the northern part, in SE Turkey, has been neglected in terms of Triassic sequences. To fill this gap, this study focuses on the Triassic section by using the power of the SGR logs acquired from the recently drilled exploration wells penetrating the Triassic succession. The advantage of this method is its ability to display depositional environments and regression-transgression cycles based on the 232Th-238U-40K measurements, even though biostratigraphical and lithological data are missing due to operational issues. Examination based on the recently developed open-source Python project, SGR Logs Interpreter Tool (SLIT), has revealed sequence boundaries and maximum flooding surfaces. According to the outcomes, eight sequence boundaries controlled sedimentation during the Triassic. Occasionally, some of the younger sequences disappear from the logs, however, a significant transgression separating Early and Mid-Triassic is consistent for the whole region and can even be observed along the wells drilled in the Western Taurides. The Early Triassic section is characterized by shallow-marine sandstones, siltstones, and shales while transition into the Mid-Late Triassic section favors carbonate platform conditions controlled by limestones, clayey limestones, dolomites, and anhydrites. Two main anhydrite deposition intervals can be easily traced by regressive character at the Northern Arabian Plate while they disappear from the log records at the Western Taurides. On the other hand, maximum flooding surfaces restrict the limits of dolomites. As a conclusion, for the first time, distinguishing of Triassic sequences using SGR logs in the SE Turkey and Mediterranean region has been conducted in this study. Differentiated sequences can be used for to better understand the evolution of Mesozoic platform and opening of the Neo-Tethys Ocean. They also provide invaluable information for the presence and extent of the seal, reservoir, and source rocks of the region.