Oman's oil ministry has invited upstream oil and gas companies to bid for onshore blocks 66, 67 and 39 in the country, Oman Daily Observer has reported. Block 66 is in the western part of the Sultanate and covers an area of around 4,899 sq km, while block 67 is located further to the south covering an area of some 1775 sq km. Block 39 covers an onshore area of 11,606 sq km and stretches along the southern coastline of Oman. Expressions of interest have been invited.