## 3 Methodology
### Justification for Heat Map  
Finally, a heat map was generated to give an idea of all the formations' hydrocarbon generation potentials using the average weight of the formations' TOC, GP, S2, and R\({}_{\text{o}}\) values. A weighted statistical ranking method was used to create the heat map with Forty-five percent weight for TOC value, and thirty, fifteen, and ten for GP, S2, and R\({}_{\text{o}}\) values, respectively. The weighted ranking percentages were assigned according to the order of importance of the parameters. The weighted statistical ranking score was estimated using the equation below:  
\[RS_{n}=\frac{\sum_{i=1}^{n}xw}{\sum_{i=1}^{n}w} \tag{1}\]  
where \(RS\) is the weighted statistical ranking score for \(n\) variable (TOC, GP, S2, and R\({}_{\text{o}}\) values), \(x\) is the hydrocarbon generation potential indicator variables values, and \(w\) is the assigned weighted ranking percentages for each variable.  
TOC was allocated 45% because it is arguably the most important parameter to consider in source rock evaluation. This is due to the fact that any prospective source rock should have a high TOC [17]. TOC measures the organic richness of sedimentary rocks by totaling the organic matter quantity available in the rock [21; 24]. The TOC analysis is the first analysis conducted to have a fair idea of the hydrocarbon potential of a formation [25; 71]. Even though TOC is an important parameter, it should not be used alone; according to [PERSON] [72], some organic matter can generate hydrocarbons while others cannot generate anything because of their inert nature. TOC analysis cannot differentiate between inert and productive organic matter; it quantifies all the organic matter in the rock [17]. This can result in inaccurate results. Moreover, TOC also reacts to the maturity of organic matter; [PERSON] [73] noticed that the amount of TOC in a rock reduced as hydrocarbons were generated and forced out. Due to these reasons, there is also a need to consider the formations' hydrocarbon yield (S2) and generic potential (GP).  
The GP received 30% of the allocation since it is the closest to TOC in estimating the potential of source rocks. GP represents the hydrocarbons that a source rock can generate if subjected to sufficient temperature [74; 75; 76]. It is the summation of S1 and S2, with S1 representing the already generated hydrocarbon and S2 representing the hydrocarbon generating potential remaining in the sediment's kerogen [75; 76]. This makes the GP superior to the S2, so a higher statistical weight is given to GP than to S2.  
Hydrocarbon yield (S2) was assigned 15% because it represents the hydrocarbon generating capacity remaining in the sediment's kerogen after a portion of the organic matter has already formed hydrocarbons [75; 76].  
Finally, the R\({}_{\text{o}}\) was given the least statistical weight (10%) because even though thermal maturity is essential to the capacity of organic matter to generate hydrocarbons,formations with extraordinarily high organic matter and low thermal maturity can still produce hydrocarbon through thermal cracking [77]. Potential source rocks, according to [PERSON] [78], are immature sedimentary rocks capable of generating and expelling hydrocarbons if their maturity level is higher. As a result, immature formations can still be considered potential source rocks.