PT Pertamina Hulu Rokan (PHR) confirmed the discovery or finding of oil in the Mustang Hitam (MTH)-001 Well located in Libo Jaya Village, Siak Regency, Riau, the Rokan Block working area.
Vice President of Exploration PHR Regional 1, Suprayitno Adhi Nugroho, conveyed this finding after his party conducted an evaluation in the production test phase (production test) to show the presence of hydrocarbons. This gives a positive signal for the potential for further development in the Central Sumatra Basin area.
"MTH-001 well has confirmed the presence of hydrocarbons in the Menggala Formation and the Pematang URB Formation. Although the initial production rate is still relatively low, this 'discovery' opens up opportunities for further development through well interventions and evaluation of other intervals that have not been tested," he said as reported by ANTARA, Friday, January 16.
Prior to the confirmation of the presence of hydrocarbons, a series of activities had been carried out to analyze the drilling operation. The MTH-001 exploration well was drilled on September 4, 2025 using the PDSI 52.3 Rig with a capacity of 750 HP and reached a final depth of 6,464 ftMD (feet Measured Depth) / 6,351.5 ftTVDSS (feet True Vertical Depth Sub Sea) on September 26, 2025.
Geologically, this well is located in the South Aman Trough Basin, Central Sumatra Basin, one of the productive oil and gas basins in Indonesia. After drilling is completed, the activity will continue to the production test phase using the BMS-007 Rig, which will be carried out in the period from December 5, 2025 to January 3, 2026.
The results of the test proved the potential content of potential oil resources from the new trap stratigraphist trap in the Pematang URB Formation and the Menggala Formation in the South Aman Trough.
From the results of the MTH-001 Well production test, there is an opportunity to increase production through further development, as well as demonstrating exploration in the working area with a new perspective and optimal data extraction still provides quite promising results.
For information, the URB Pematang Formation is an old oil-producing rock layer, while the Menggala Formation is a sandstone layer that is the main oil reservoir. Both are located in the Central Sumatra Basin (Central Sumatra Basin) in the Rokan Block.
Currently, PHR is still conducting a comprehensive study on the potential of resources - reserves and development schemes. The estimation of the amount of resources - reserves is carried out by integrating all datasubsurfacedan the results of the test.
"The exploration and development team is preparing the Initial Production Scenario (POPE) for this discovery, which can be monetized immediately and optimally," he explained.
Geographically, the MTH-001 well has a strategic position because it is about 3 km from the Oki Field, 4 km from the Kokoh Field, and 6 km from the Libo Gathering Station (GS), thus opening up opportunities for synergy of existing facilities and field development efficiency.
The success of the Sumur MTH-001 discovery confirms PHR's commitment to carrying out sustainable exploration in the Central Sumatra Basin, as well as strengthening the role of the Rokan Block as the backbone of national oil and gas production.
PHR will continue to carry out exploration and development activities for oil and gas in a prudent, data-based manner, and prioritize safety and sustainability aspects, to support Indonesia's national production targets and energy security.
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