In the second panel presented here, doesn't it look like those derricks are in front of the (non-domed) OKC capital building?
Here's my guess. This coloring book, as you'll recall from a previous post, is copyright 1980, which is during the tenure of "Mr. Superman Know-It-All" for DC Comics, E. Nelson Bridwell.
I'd say that Mr. B might have had a hand in the assembly of the stories in this here kiddie book. And since E. Nelson Bridwell grew up in Oklahoma City, the depiction of the capital building surrounded by oil derricks is precisely the kind of thing he would have "dropped into" the story.
What do you think?