Mahanadi Offshore Basin: India drills 1st appraisal well for energy security
Synopsis
India has spudded its first deepwater appraisal well in the Mahanadi Offshore Basin — one of four planned wells that could unlock a largely untapped hydrocarbon frontier. With 81% of active exploration acreage awarded post-2014 and $4.3 billion in committed OALP investments, this drill is both a technical milestone and a political statement on energy self-reliance.
Key Takeaways
India commenced drilling of appraisal well MN-DWN18-1-HD in the Mahanadi Offshore Basin on 26 July 2025 .
It is the first of four planned deepwater wells to evaluate the basin's hydrocarbon potential.
Under OALP , 172 exploration blocks covering 3.8 lakh sq km have been awarded, with investments exceeding $4.3 billion .
Nearly 81% of India's active exploration acreage has been awarded after 2014 .
In FY 2025-26 , around 674 wells were drilled, 5 new discoveries made, and 7 discoveries monetised.
Nearly 99% of erstwhile offshore 'No-Go' areas have been opened for exploration.
India on Saturday, 26 July 2025, commenced drilling of the first appraisal well in the Mahanadi Offshore Basin, marking what Petroleum and Natural Gas Minister Hardeep Singh Puri called 'the beginning of a new chapter in India's journey towards energy security.' The milestone signals a significant step in the country's push to reduce dependence on imported hydrocarbons and expand domestic production.
About the Appraisal Well
The well, designated MN-DWN18-1-HD, is the first of four planned deepwater wells that will systematically evaluate the Mahanadi Offshore Basin — described by the Petroleum Ministry as one of India's most prospective offshore basins. The drilling programme will deploy world-class deepwater technology to unlock new hydrocarbon resources and bolster domestic production capability.
What the Minister Said
Minister Hardeep Singh Puri framed the occasion as the culmination of a decade of policy reform. 'As we commence this first well today, we are not merely drilling into the seabed — we are drilling into India's future energy security. Every metre drilled brings us closer to reducing import dependence, strengthening self-reliance and realising the vision of Viksit Bharat,' he said. Puri congratulated ONGC, Oil India Limited, the Directorate General of Hydrocarbons, technical partners, and the broader exploration community on the achievement.
A Decade of Exploration Reforms
Puri highlighted a series of structural reforms that have reshaped India's exploration and production landscape since 2014. These include the introduction of the Hydrocarbon Exploration and Licensing Policy (HELP), the replacement of the nomination-based approach with the Open Acreage Licensing Programme (OALP), the adoption of a transparent Revenue Sharing framework, and the opening of nearly 99% of erstwhile offshore 'No-Go' areas for exploration. Notably, around 81% of India's active exploration acreage has been awarded after 2014.
OALP by the Numbers
Under OALP, 172 exploration blocks covering nearly 3.8 lakh square kilometres have been awarded, with committed investments exceeding $4.3 billion. During FY 2025-26 alone, approximately 674 wells were drilled, five new discoveries were made, and seven discoveries were monetised — underscoring the accelerating pace of India's upstream energy activity.
What Comes Next
The remaining three deepwater appraisal wells in the Mahanadi Offshore Basin are expected to follow in a phased sequence, with each well designed to build on the geological data gathered from its predecessor. A successful appraisal programme could pave the way for commercial development of one of India's least-tapped offshore frontiers, with implications for long-term domestic gas supply and the country's broader energy self-reliance agenda.
Point of View
But appraisal wells are a long way from production — and India's hydrocarbon import bill remains one of the largest drags on its current account. The real test is whether the basin's geology matches its prospectivity estimates and whether ONGC and Oil India can move from discovery to monetisation faster than past deepwater campaigns, which have historically taken a decade or more. With seven discoveries monetised in FY26, there are signs the pipeline is moving — but the gap between drilling activity and actual domestic supply growth remains wide enough to warrant measured expectations.
NationPress
25 Jul 2026
Frequently Asked Questions
What is the MN-DWN18-1-HD appraisal well in the Mahanadi Offshore Basin?
MN-DWN18-1-HD is the first of four planned deepwater appraisal wells being drilled in the Mahanadi Offshore Basin, one of India's most prospective offshore hydrocarbon regions. Its drilling commenced on 26 July 2025 using world-class deepwater technology to evaluate the basin's hydrocarbon resources.
Why is the Mahanadi Offshore Basin significant for India's energy security?
The Mahanadi Offshore Basin is considered one of India's most prospective untapped offshore frontiers, and a successful appraisal could open a new domestic source of hydrocarbons. Reducing import dependence is a core objective of India's energy policy, and deepwater discoveries here could meaningfully contribute to long-term domestic supply.
What is the Open Acreage Licensing Programme (OALP) and how does it relate to this drilling?
OALP replaced the earlier nomination-based approach to block allocation, allowing explorers to express interest in any acreage and bid transparently. Under OALP, 172 blocks covering 3.8 lakh square kilometres have been awarded with committed investments exceeding $4.3 billion, of which the Mahanadi deepwater programme is a direct outcome.
Who are the key organisations involved in the Mahanadi Offshore Basin drilling?
The drilling involves ONGC, Oil India Limited, and the Directorate General of Hydrocarbons, along with technical partners. Petroleum Minister Hardeep Singh Puri publicly congratulated all stakeholders at the commencement of drilling.
How active has India's oil and gas exploration been in FY 2025-26?
In FY 2025-26 alone, approximately 674 wells were drilled across India, five new hydrocarbon discoveries were made, and seven existing discoveries were monetised, according to the Petroleum Ministry — reflecting an accelerating pace of upstream activity.
