Depletion effect on basis

I'm trying to figure out a shareholder's basis in his scorp. Im trying to figure this out from the k1s and balance sheets through the years. It looks like basis is reduced by depletion taken up to cost on a property by property basis and anything in excess is added to basis for oil and gas depletion. I see the total tentative depletion shown on the K1 and I know the excess amount too. So would the difference from those two amounts be the reduction in basis piece I need?