Deferment (producing later instead of now) is really expensive if you are using a reasonable discount rate, so this would be quite expensive. I think your plan would also constrain supply, raising the oil/gas price and making the cost even higher.

If you want to ballpark costs, try deferring whatever fraction you like of us oil prod for, say, 10 years. Try a discount rate of 7-8% and figure out the costs/year. I would assume oil price of at least 80/bbl if you are trying to estimate costs on a reasonable timescale.