Thermal Maturation and Subsidence History Studies in Some Parts of the Eastern Niger Delta Basin, Southern Nigeria Using Well-logs

Abstract

Subsidence history and hydrocarbon maturation studies was analysed using well log data from four adjacent fields from the eastern part of Niger Delta basin. Three major tectonic phases of the basin evolution were identified as, firstly, a phase of subsidence from the mid to early Miocene, a second phase of uplift from the early Miocene to the mid Pliocene then lastly a period of subsidence from the mid Pliocene to the early Pliestocene. Results from Vitrinite Reflectance models of the wells showed sediments of Belema, Inda and Idama wells were thermally immature for hydrocarbon generation with values less than 6.5%R0, whereas Robertkiri-14 well showed sediments were thermally mature source rock sediments with a modelled %Ro value of 6.5, this showed the well and by extension the field had great mature hydrocarbon potential.