Bayan field is located in sub-block 4Q-21 of the Balingian Province, 80km North West of Bintulu, Sarawak.

In November 2012, Dialog D &P Sdn. Bhd. (DDP), a wholly owned subsidiary of DIALOG, subscribed to 50 per cent equity in Halliburton Bayan Petroleum Sdn. Bhd. (HBP) from Asia Energy Services Sdn. Bhd. (wholly owned subsidiary of Halliburton International Inc.).

HBP entered into an Oilfield Service Contract (OSC) with Petronas Carigali Sdn. Bhd. to enhance the recoverable reserves through production enhancement activities, oil development and prospect appraisal across the Bayan field.

Production enhancement activities have been ongoing since 2015 and further studies continue to be conducted to further develop the field.