Santos has spudded the AAL-4X appraisal well in the Northwest Natuna Production Sharing Contract (PSC) offshore Indonesia. The company-operated well is being drilled in 236 ft of water to a planned maximum 4,042-ft true vertical depth from mean sea level. The well targets the G Sand reservoir, which is estimated to hold 36 million bbl of gross recoverable oil resources. Santos and AWE each have a 50% interest in the PSC.