Abstract
Selected subsurface core samples of the shale of Akinbo Formation as penetrated by an exploratory well in Ibese, Eastern Dahomey basin were investigated to ascertain the quality and quantity of organic matter, the hydrocarbon potential and kerogen type.The samples were subjected to Total Organic Carbon (TOC) and Rock Eval analyses and various cross plots were generated from the data obtained.The TOC and Free oil content (S1) of all the shale samples range from 0.96wt% to 2.82wt% and 0.07mgHC/g to 0.17mgHC/g with mean values of 1.67wt% and 0.11mgHC/g respectively while the source rock potential (S2) ranges from 0.01mgHC/g to 0.17mgHC/g with an average value of 0.08mgHC/g. Also, the Hydrogen Index (HI) and the Oxygen Index (OI), ranges from 0.35mgHC/g TOC to 16.7mgHC/g TOC and 11.4mgCO/g TOC to 38.33mgCO/g TOC with an average value of 5.77mgHC/g TOC and 19.04mgCO/g TOC respectively. The Production Index (PI) and the Generative Potential (GP) range from 0.38 to 0.94 and 0.12mgHC/g to 0.34mgHC/g with mean values of 0.61 and 0.19mgHC/g respectively.The results obtained from the cross plots of HI versus OI, S2 versus TOC and TOC versus GP; It shows that the shale samples from the Akinbo Formation have good organic matter richness to generate hydrocarbon, dominantly gas prone and from a Type III kerogen.
Highlights
The buildup of any prospect in a petroleum system requires the availability of a good source rock
The results obtained from the cross plots of Hydrogen Index (HI) versus Oxygen Index (OI), S2 versus Total Organic Carbon (TOC) and TOC versus Generative Potential (GP); It shows that the shale samples from the Akinbo Formation have good organic matter richness to generate hydrocarbon, dominantly gas prone and from a Type III kerogen
Source rock hydrocarbon-generating potential is directly related to its volume, organic richness and thermal maturity (McCarthy et al 2011).Some of these parameters were made use of in this research to assess the quality and quantity of the organic matter contained in the selected shale; and evaluation of the kerogen type to deduce the kind of hydrocarbon it can produce
Summary
The buildup of any prospect in a petroleum system requires the availability of a good source rock. Source rock hydrocarbon-generating potential is directly related to its volume, organic richness and thermal maturity (McCarthy et al 2011).Some of these parameters were made use of in this research to assess the quality and quantity of the organic matter contained in the selected shale; and evaluation of the kerogen type to deduce the kind of hydrocarbon it can produce. This is hinged at giving more information needed to optimize development in exploration and exploitation of hydrocarbon in the Eastern Dahomey basin
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