In the UK when the SNP were banging on about oil revenues BP's profits were something in the region of £350 million pounds, Government revenue from "Scottish oil" was £1 billion pounds. This was the wealth that was going to finance their independent Scotland - what they studiously ignored was that while £1 billion went South to Westminster, £9 billion was sent North from Westminster.

Governments make money from the oil and gas industry, and every service aspect of that industry, and all the way down the line to those who use its products. It is revenue that they would be hard put to replace if alternative sources were used - but no doubt they would find a way. If you want to find who has the vested interest in keeping things the way they are, look no further than those you elect.