How Do You Evaluate a Company That Is Like Occidental?

How would you go about valuing a company that is like occidental? So what i have done, and it's mostly been looking at companies that rely on using energy more than energy companies. I'd imagine looking at a shiller p e would be the only useful way of using an earning metric since it's always over or under earning relative to its earning power. But otherwise, you don't need to look at a long term schiller p type approach because you have information about the actual reserves or acids or whatever that it has to day. And that's what matters.