Abstract
Sedimentary deposits in Block 5, offshore Tanzania basin have been imaged using two-dimensional (2D) seismic data. The seismic data and well data reveal four tectonic units representing different tectonic events in relation to structural styles, sedimentation and hydrocarbon potential evolved in Block 5. Results show that during Early to Late Jurassic, Block 5 was affected by the break-up of Gondwana and the drifting of Madagascar as evidenced by patterns of sediments and structural features. The chaotic and discontinuous reflectors are characteristics features on the sediments pattern indicating a possible transitional setting following the breakup of Gondwana. From the Late Cretaceous, Block 5 sits in more stable subsiding sag as the consequence of the high thermal subsidence. The period displayed continuous parallel reflectors with few markable faults. This was followed by the late post rift sedimentation that occurred after Middle Eocene Unconformity characterized by high wavy and sub parallel reflectors. The evolution of Block 5 through major tectonic events reveals a more complete petroleum system towards the south. Thus, Block 5 responded in both space and time to a complex interplay between tectonics and sedimentation. This indicates that structural styles and associated features are potential control for hydrocarbon generation and migration.
Highlights
The exploration Block 5 is found within the known Mafia Deep Offshore Basin formed as a product of Gondwana breakup [1] (Figure 1)
The interpretation of 2D seismic reflection integrated by well data in line with the knowledge of geological setting of Tanzanian margin has revealed four tectonic units representing different tectonic phases and styles occurred in Block 5
The structural style in Block 5 consists of combination of early rift, later inversion and strike slip whose association reflects the same local tectonic setting
Summary
The exploration Block 5 is found within the known Mafia Deep Offshore Basin formed as a product of Gondwana breakup [1] (Figure 1). The offshore exploration Blocks are located in East African Passive Continental Margin setting [2]. Offshore exploration Blocks within the Mafia Deep Basin of Tanzania encompass Blocks 1 to 12, which are bordered to the south by Rovuma Delta, the Mafia Island to the north and by the Davie Ridge transform to the east (Figure 1). These offshore deep water Blocks are categorized into two groups namely North Offshore Blocks (NOBs) that include Blocks 5 to 12 and the South Offshore Blocks (SOBs) consisting of Blocks 1 to 4
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