lime plays can be excellent producer's.I've been on a couple as a working interest partner. The rock is a little harder but with the right perf and acid frack they can be great producers.

In Belize this is what they have at around 1300 feet.Using the microscope is about the only way you will see oil, Unless its circulated out of the hole which is rare for a lime play that I have seen.The rock is hard and will not give up much untill treated. I think the Drake units are for this depth. I thought the engines from the FB pic's looked like it ran on gasoline,since electricty is not there yet.
I had one well that ran on NG as a engine...Someone had stolen it the first night it was in operation..100bpd no engine