The Andaman Basin, located offshore the Andaman and Nicobar Islands in the Bay of Bengal, is rapidly emerging as one of India’s most exciting frontier regions for hydrocarbon exploration. Recent gas discoveries and policy reforms have drawn attention from both domestic energy giants and international oil majors, raising hopes that the basin could significantly bolster India’s energy security and contribute to its long-term economic ambitions.
Breakthrough Discovery by Oil India Limited
In September 2025, Oil India Limited (OIL) announced a significant milestone with the Vijayapuram-2 (Sri Vijayapuram-2) well in the offshore block AN-OSHP-2018/1, east of the Andaman Islands. Drilled in approximately 295 meters of water to a target depth of around 2,650 meters, the well encountered natural gas during testing, with gas analysis revealing about 87% methane content.
This marked the first confirmed hydrocarbon occurrence in OIL’s ongoing Andaman exploration campaign. The company described it as evidence of an “active thermogenic petroleum system” in the region. Preliminary testing showed intermittent flow from depths between 2,212 and 2,250 meters. While the full size and commercial viability are still under assessment through further studies, the find has validated the basin’s potential for clean natural gas resources.
ONGC has also intensified efforts in the area. The national oil company spudded the Andaman West-1 well in January 2026 and reported signs of crude oil and condensate, further strengthening confidence in the basin’s hydrocarbon prospectivity.
Policy Push: Opening Up Vast New Acreage
A major catalyst for renewed interest came in early 2026 when Lieutenant Governor of the Andaman and Nicobar Islands, Admiral (Retd.) DK Joshi, announced that nearly 4 lakh square kilometers of previously restricted “No-Go Zone” areas in the basin have been opened for oil and gas exploration. This represents a substantial portion—around 63.5%—of the total 6 lakh square kilometers previously off-limits.
Lt. Governor Joshi highlighted the basin’s “Guyana-like” potential, suggesting that successful exploration could play a pivotal role in propelling India from a $4 trillion economy toward its ambitious $20 trillion target. Global majors are reportedly in advanced talks for joint ventures with ONGC and Oil India, signaling strong international appetite for participation.
India’s Open Acreage Licensing Policy (OALP) has facilitated the offering of multiple blocks in the region. Collaborative efforts, including a strategic partnership between ONGC, Oil India, and BP for stratigraphic drilling across frontier basins (including Andaman), are helping to de-risk exploration through shared technology and expertise. Resource-sharing arrangements involving Reliance Industries and BP in deepwater operations on India’s east coast further underscore the growing ecosystem.
Geological Promise and Regional Analogies
Geologically, the Andaman Basin is classified as a Category-II frontier basin with structural similarities to prolific hydrocarbon plays in Southeast Asia, such as those in Sumatra (Indonesia) and Myanmar. Its location near the junction of the Indian, Burmese, and Sunda plates creates complex tectonics but also favorable conditions for Tertiary-age reservoirs.
Optimistic projections draw parallels with Guyana’s transformative offshore discoveries, which turned the South American nation into a major oil producer. India’s Hydrocarbon Resource Assessment studies have pointed to substantial undiscovered potential in the Andaman-Nicobar Basin, which could help reduce the country’s heavy dependence on imported oil (around 85-88%) and natural gas.
Significant Challenges Remain
Despite the excitement, the Andaman Basin is still in an early exploration phase with notable hurdles:
- High Exploration Risk: While initial wells have shown encouraging hydrocarbon indications, many frontier wells prove dry or sub-commercial. Full appraisal drilling and extensive 3D seismic campaigns are required to delineate reservoir size, quality, and connectivity.
- Technical and Operational Difficulties: Some prospects lie in ultra-deep waters or involve targets exceeding 6,000 meters below the seabed. Drilling costs can surpass $200 million per well, and the region faces harsh environmental conditions, limited existing infrastructure, and potential reservoir complexities such as high CO₂ content.
- Long Timeline to Production: Even with positive appraisal results, commercial development is unlikely before the mid-2030s. Analysts estimate it could take a decade or more from initial discoveries to first production, given the need for massive infrastructure investment.
Strategic Importance for India’s Energy Future
India continues to aggressively expand its offshore exploration acreage, targeting 5 lakh square kilometers under active exploration. Discoveries like the one in Andaman align with broader initiatives such as the National Deep Water Exploration Mission and efforts to attract cutting-edge technology from partners like TotalEnergies, Shell, ExxonMobil, and Petrobras.
If the basin lives up to its promise, it could provide a meaningful boost to domestic production, enhance energy security, and support India’s transition toward greater self-reliance. The recent gas find, combined with policy liberalization and international collaboration, positions the Andaman Basin as a high-potential frontier that is generating genuine global interest.
While it is premature to declare it India’s “next big oil discovery” on the scale of historical giants, the early signals are undeniably positive. The coming years—particularly additional drilling and appraisal campaigns expected through 2026–2028—will be decisive in determining whether the Andaman Basin can deliver transformative reserves for the nation.
For now, the basin represents both opportunity and patience: proof that an active petroleum system exists, but one that demands sustained investment and technical perseverance to unlock its full value.
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