Jakarta, April 19 -- A total of 18 national and multinational firms have accessed the first round of oil and gas bidding of five conventional working areas, opened since Feb 21.

According to Antara's data here, Friday, the five oil and gas working areas constituted two production areas and three exploration working areas.

The two production areas on offer in the bidding are the West Kampar Block in Riau and North Sumatra and Selat Panjang Block in Riau.

The three exploration working areas being offered are the Anambas Block in Riau Islands offshore, West Ganal Block in East Kalimantan offshore, and West Kaimana Block in Papua Barat.

"A total of18 multinational and national companies have submitted bid documents for the five oil and gas ...