<h1>Greater Chandmari Oil and Gas Project (Assam,India)</h1>
<h2>Quick Facts</h2>
<table>
<colgroup><col/><col/></colgroup>
<tbody>
<tr><th>Item</th><th>Detail</th></tr>
<tr><td>Project Name</td><td>Greater Chandmari Oil and Gas Project</td></tr>
<tr><td>Country</td><td>India</td></tr>
<tr><td>Subnational Unit</td><td>Assam</td></tr>
<tr><td>Fuel Type</td><td>Oil and gas</td></tr>
<tr><td>Production Type</td><td>Conventional</td></tr>
<tr><td>Status</td><td>Operating</td></tr>
<tr><td>Status Year</td><td>2024</td></tr>
<tr><td>Operator</td><td>Oil India</td></tr>
<tr><td>Owner(s)</td><td>Oil India Ltd 100%</td></tr>
<tr><td>Parent Company</td><td>Oil India Ltd 100.0%</td></tr>
<tr><td>Production Start Year</td><td>2003</td></tr>
<tr><td>Onshore/Offshore</td><td>Onshore</td></tr>
<tr><td>Basin</td><td>Assam-Arakan Basin / Upper Assam Shelf</td></tr>
<tr><td>Block(s)</td><td>Greater Chandmari Field</td></tr>
</tbody>
</table>
<h2>Project Overview</h2>
<p>Greater Chandmari is an onshore conventional oil and gas project in Assam,India,operated by Oil India. The project is an active producing field within the Upper Assam producing area,part of Oil India’s long-established Main Producing Area in Assam and Arunachal Pradesh. It entered production in 2003 and is a mature onshore asset requiring ongoing reservoir management,workovers,water-cut control,and production optimization.</p>
<p>The project is not a new development. It is a mature field where production decline,rising water cut,and well performance challenges are managed through continued field development programs,water injection,and enhanced recovery activities.</p>
<h2>Location and Basin</h2>
<p>The project is located onshore in Assam,India. The field is within the Assam-Arakan Basin,specifically the Upper Assam Shelf. The Upper Assam Shelf contains approximately 7,000 metres of Tertiary sediments,with major oil fields in sandstone reservoirs ranging from Upper Paleocene-Lower Eocene to Mio-Pliocene age. Barail and Tipam reservoirs are the main productive intervals. Regional hydrocarbon in-place for the Assam Shelf basin is reported as 2,700 MMTOE,with discovered in-place of 1,826 MMTOE. Greater Chandmari is listed among major producing fields of the basin,with cumulative production of 70 MMT and 8.5 BCM.</p>
<h2>Ownership and Operatorship</h2>
<p>The project is operated and wholly owned by Oil India Ltd. The ownership structure places technical and capital decisions within Oil India’s operating system. Crude from Greater Chandmari installations flows to the Central Tank Farm at Duliajan,integrating the field into Oil India’s regional crude handling and dispatch network.</p>
<h2>Development History</h2>
<table>
<colgroup><col/><col/></colgroup>
<tbody>
<tr><th>Milestone</th><th>Year</th></tr>
<tr><td>Production start</td><td>2003</td></tr>
<tr><td>Status</td><td>2024</td></tr>
</tbody>
</table>
<p>Production started in 2003. The project’s development history is less extensively documented than older Assam fields. A parliamentary review identified Greater Chandmari as one of Oil India’s most prolific fields,noting that rising water cut and decline in total liquid production contributed to crude oil output shortfall. A peer-reviewed study of the Chandmari oil field evaluated well log data and rock physics modeling for Eocene reservoirs.</p>
<h2>Infrastructure and Facilities</h2>
<p>Crude from Greater Chandmari installations is sent to the Central Tank Farm at Duliajan,which has storage capacity of 54,836 cubic metres,including four fixed cone roof tanks and five floating roof tanks. Incoming crude is received through a common manifold; formation water separates by settling and is pumped for further disposal. No offshore platforms,subsea systems,or LNG trains are associated with the project.</p>
<h2>Production and Reserves</h2>
<p>Global Energy Monitor reported gas 2P reserves of 7,409 million cubic metres (2007 data year) and remaining gas reserves of 6,965.98 million cubic metres (2021 data year). Oil 2P reserves were 53.53 million barrels (2007 data year). Historical production figures include gas production of 29.2 million cubic metres per year (2007) and 535.84 million cubic metres per year (2017); oil production of 1.48 million barrels per year (2007) and 4.83 million barrels per year (2017). India’s Hydrocarbon Outlook 2023-2024 lists cumulative production of 70 MMT and 8.5 BCM for Greater Chandmari.</p>
<h2>Recent Developments</h2>
<p>A parliamentary review of Oil India reported that the Main Producing Area in Assam and Arunachal Pradesh is highly mature and in natural decline,with rising water cut and declining total liquid production from wells in Greater Hapjan and Greater Chandmari contributing to production shortfall. Enhanced oil recovery and improved oil recovery activities,including water injection,are used to maintain production. Oil India’s company-level financial results for the year ended 31 March 2025 show revenue of ₹23,987 crore and profit after tax of ₹6,114 crore.</p>
<h2>Related Topics</h2>
<ul>
<li>Oil India upstream operations in Assam</li>
<li>Assam-Arakan Basin petroleum systems</li>
<li>Upper Assam Shelf oil and gas fields</li>
<li>Greater Hapjan Field</li>
<li>Duliajan Central Tank Farm</li>
<li>Mature-field production decline</li>
<li>Water-cut management in oil fields</li>
<li>Enhanced oil recovery in mature onshore fields</li>
<li>Petrophysical evaluation of Eocene reservoirs</li>
<li>India domestic oil and gas production</li>
<li>Oil India Main Producing Area</li>
</ul>
<h2>Sources</h2>
<ul>
<li><a href="https://www.gem.wiki/Greater_Chandmari_Oil_and_Gas_Project_%28Assam%2C_India%29" rel="nofollow noopener" target="_blank">Global Energy Monitor: Greater Chandmari Oil and Gas Project (Assam,India)</a></li>
<li><a href="https://dghindia.gov.in/assets/downloads/ar/2023-24/64/" rel="nofollow noopener" target="_blank">Directorate General of Hydrocarbons: India’s Hydrocarbon Outlook Report 2023-2024</a></li>
<li><a href="https://www.ndrdgh.gov.in/NDR/?page_id=617" rel="nofollow noopener" target="_blank">National Data Repository,Directorate General of Hydrocarbons: Assam-Arakan Basin</a></li>
<li><a href="https://link.springer.com/article/10.1007/s13202-017-0373-8" rel="nofollow noopener" target="_blank">Journal of Petroleum Exploration and Production Technology: Petrophysical Evaluation of Well Log Data and Rock Physics Modeling for Chandmari Oil Field</a></li>
<li><a href="https://eparlib.sansad.in/bitstream/123456789/2963644/1/17_Public_Undertakings_21.pdf" rel="nofollow noopener" target="_blank">Parliament of India Committee on Public Undertakings: Oil India Limited Report</a></li>
<li><a href="https://www.oil-india.com/financial-results" rel="nofollow noopener" target="_blank">Oil India Limited: Financial Results and Annual Reports</a></li>
<li><a href="https://www.oil-india.com/files/oldtender/national/NIT_CDI2263P17.pdf" rel="nofollow noopener" target="_blank">Oil India Limited: Central Tank Farm Tender Document,Duliajan</a></li>
<li><a href="https://www.offshore-technology.com/marketdata/oil-gas-field-profile-greater-chandmari-conventional-oil-field-india/" rel="nofollow noopener" target="_blank">Offshore Technology: Greater Chandmari Conventional Oil Field Profile</a></li>
</ul>

IEPTC reference profile for Greater Chandmari Oil and Gas in Assam,India,covering asset type,location,development status,and upstream industry context.

Greater Chandmari Oil and Gas Project (Assam,India)

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Greater Chandmari Oil and Gas Project (Assam,India)

Greater Chandmari Oil and Gas Project (Assam,India)

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