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Abstract <p>This study provides insights into the relatively understudied Karoo-equivalent section of Pangarawe within the Tanga Basin, with a specific focus on elucidating its depositional environment and characterizing the types of kerogen present and their implication on hydrocarbon potential. Using a palynofacies analysis approach, organic matter was characterized, and the depositional environments were reconstructed, offering a deeper understanding of the basin’s hydrocarbon potential. The results reveal sediments dominated by sporomorphs, with fewer phytoclasts and sparse to no amorphous organic matter (AOM), indicating deposition in an oxic shelf, mud-dominated environment typical of a shallow lacustrine environment in proximity to fluvial sources. This setting is conducive to organic matter supply and preservation, reinforcing the hydrocarbon potential of Pangarawe Karoo equivalent sections within the broader Tanga Basin system. Kerogen analysis demonstrates a dominance of Type III kerogen, which is mainly gas-prone, with a Thermal Alteration Index (TAI) of 2+ to 3, signifying maturity within the oil window. The findings corroborate the previously published results of kerogen typing evaluated using pyrolysis in the other Karoo equivalent section of the Tanga Basin. This alignment suggests a consistent geochemical and thermal evolution across the basin, reinforcing the regional hydrocarbon potential.</p> Highlights <p><UnorderedList Mark="Bullet"> <ItemContent> <p>Single Palynofacies association identified, dominated by sporomorphs, minimal phytoclasts and less to no AOM.</p> </ItemContent> <ItemContent> <p>Palynofacies assemblage reflects deposition in oxic shelf, mud-dominated with increasing fluvial activity.</p> </ItemContent> <ItemContent> <p>Palynofacies assemblage dominated by kerogen type III, gas-prone, which are matured within the oil window.</p> </ItemContent> <ItemContent> <p>Findings align with previous studies, suggesting comparable hydrocarbon generation potential, and reaffirming the significant gas prospectivity of the Tanga Basin.</p> </ItemContent> </UnorderedList></p>

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Visual kerogen typing and palynofacies analysis of Pangarawe, Karoo Section of Tanga Basin, Tanzania: Implications for depositional environment and hydrocarbon potential

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Rachel Sabuni

摘要

Abstract

This study provides insights into the relatively understudied Karoo-equivalent section of Pangarawe within the Tanga Basin, with a specific focus on elucidating its depositional environment and characterizing the types of kerogen present and their implication on hydrocarbon potential. Using a palynofacies analysis approach, organic matter was characterized, and the depositional environments were reconstructed, offering a deeper understanding of the basin’s hydrocarbon potential. The results reveal sediments dominated by sporomorphs, with fewer phytoclasts and sparse to no amorphous organic matter (AOM), indicating deposition in an oxic shelf, mud-dominated environment typical of a shallow lacustrine environment in proximity to fluvial sources. This setting is conducive to organic matter supply and preservation, reinforcing the hydrocarbon potential of Pangarawe Karoo equivalent sections within the broader Tanga Basin system. Kerogen analysis demonstrates a dominance of Type III kerogen, which is mainly gas-prone, with a Thermal Alteration Index (TAI) of 2+ to 3, signifying maturity within the oil window. The findings corroborate the previously published results of kerogen typing evaluated using pyrolysis in the other Karoo equivalent section of the Tanga Basin. This alignment suggests a consistent geochemical and thermal evolution across the basin, reinforcing the regional hydrocarbon potential.

Highlights

Single Palynofacies association identified, dominated by sporomorphs, minimal phytoclasts and less to no AOM.

Palynofacies assemblage reflects deposition in oxic shelf, mud-dominated with increasing fluvial activity.

Palynofacies assemblage dominated by kerogen type III, gas-prone, which are matured within the oil window.

Findings align with previous studies, suggesting comparable hydrocarbon generation potential, and reaffirming the significant gas prospectivity of the Tanga Basin.