RE: Oil found in Ruvuma3 Jul 2023 06:45
Whenever new and potentially good news lands there is always a spoiler alert. This time it us a claim of old old news, while it has to be said studies have been done in the past this is a completely new study and should be read as such. Comparisons can and should be made, but new studies should not be dismissed so easily
Abstract
Ruvuma Basin is widely recognized across the world for large gas field discoveries, which indicate the presence of gas-prone sources. However, little is known about the basin's source rock's hydrocarbon generation potential, including the distribution of significant petroleum systems. Inferences are often drawn from Permo-Triassic and Jurassic source rocks in Mandawa Basin, Tanzania and Morondava Basin, Madagascar. As a result, knowledge of the basin's potential source rocks is not known. To constrain possible source beds including petroleum systems, this study thoroughly reviewed previous literature coupled with rock eval pyrolysis and vitrinite reflectance analysis on rock cuttings (n = 19) from the Ruvuma Basin's Permo-Triassic, Jurassic, and Cretaceous shales of Lukuledi-1 well.
The findings indicate variable petroleum systems with different generation potentialities in the Permo-Triassic, Jurassic, Cretaceous, and Cenozoic intervals. The Permo-Triassic plays sourced hydrocarbons from the matured Permo-Triassic shales of kerogen type II and I, with Total Organic Carbon (TOC) average of 40 %wt, Hydrogen index (HI) average of 286.5 mg HC/g TOC, vitrinite reflectance (Ro%) average of 0.81 with Tmax average of 436 Β°C capable of oil generation. The Jurassic play systems are charged from matured Jurassic kerogen type III and mixed type II/III shales with TOCβΌ 4 %wt, HIβΌ54.25 mg HC/g TOC, Ro% βΌ0.6 and Tmax βΌ444 Β°C capable of gas generation. Cretaceous and the Cenozoic play systems, sourced hydrocarbon from deeper sources because their source rocks are thermally immature with kerogen type III, having TOC βΌ0.6 %wt, HI βΌ53.6 mg HC/g TOC, Ro% βΌ0.3 and Tmax