Timing of the Miocene-Quaternary magmatic intrusions in the Tanga offshore basin: correlation to age equivalent deposits in the Eyasi-Wembere basin and their implications for petroleum potential

Abstract

Detailed 2D qualitative seismic interpretation, coupled with core logging and analysis of elemental proxies, has been used to assess petroleum potential of the Miocene-Quaternary successions of the Tanga offshore basin. These successions have been intruded by magmatic sills and dykes. Based on seismic well tie and correlation with age equivalent onshore successions in the Eyasi-Wembere basin, the timing of these intrusions are linked to periods of tectonic episodes that influenced development of the East African Rift basins. Seismic interpretation has shown that these tectonic episodes occurred during the Miocene-Pliocene, Pleistocene and Holocene periods. The magmatic bodies are thought to have promoted source rock maturation and facilitate formation of structural elements for petroleum trapping in the basin.