State tax exemption for intra State licences or leases to explore or mine petroleum, limited to consideration treated as profit share. Exempts intra State supply of services by grant of licence or lease to explore or mine petroleum crude or natural gas from State tax to the extent attributable to consideration paid to the Central Government as its contractually defined share of profit on petroleum, limiting relief to the portion of State tax corresponding to that profit share and applying to licences or leases for exploration or mining.