<h1>Block A-18 Oil and Gas Project,Malaysia–Thailand Joint Development Area</h1>

<h2>Overview</h2>
<p>Block A-18 is an offshore conventional gas and condensate development in the Malaysia-Thailand Joint Development Area (MTJDA),located in the lower Gulf of Thailand. The project is operated by Carigali Hess Operating Company. Ownership is held equally by Petronas Carigali Sdn Bhd (50%) and PTTEP Joint Development SG Pte Ltd (50%),with parent-company interests linked to Petroliam Nasional Bhd and PTT PCL. Production began in 2005. The project includes the Cakerawala,Bumi,Suriya,and Bulan fields,along with related accumulations. Block A-18 supplies natural gas to both Malaysia and Thailand. In 2025,PTTEP reported production of approximately 600 million standard cubic feet per day,equally distributed to the two countries.</p>

<h2>Quick Facts</h2>
<table>
<thead>
<tr><th>Item</th><th>Details</th></tr>
</thead>
<tbody>
<tr><td>Project Name</td><td>Block A-18 Oil and Gas Project</td></tr>
<tr><td>Country</td><td>Malaysia,Thailand</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>2025</td></tr>
<tr><td>Operator</td><td>Carigali Hess Operating Company</td></tr>
<tr><td>Owner(s)</td><td>PTTEP Joint Development SG Pte Ltd (50%); Petronas Carigali Sdn Bhd (50%)</td></tr>
<tr><td>Parent Company</td><td>Petroliam Nasional Bhd (50.0%); PTT PCL (50.0%)</td></tr>
<tr><td>Production Start Year</td><td>2005</td></tr>
<tr><td>Onshore/Offshore</td><td>Offshore</td></tr>
<tr><td>Block(s)</td><td>Block A-18</td></tr>
</tbody>
</table>

<h2>Project Overview</h2>
<p>Block A-18 is located offshore in the lower Gulf of Thailand,approximately 150 kilometers northeast of Kota Bharu (Malaysia) and 160 kilometers east of Narathiwat (Thailand),in water depths of about 60 meters. The block is part of the MTJDA,a jointly administered area established to manage hydrocarbon resources in a zone of overlapping maritime claims.</p>
<p>The project consists of multiple offshore fields,including Cakerawala,Bumi,Suriya,and Bulan. Infrastructure includes 12 wellhead platforms,a Central Processing Platform and Living Quarters,a Riser Platform,and a floating storage and offloading unit (FSO Puteri Cakerawala). Gas from the block is delivered to a receiving facility in Songkhla,Thailand,and into Peninsular Malaysia’s gas system.</p>
<p>The operator is Carigali Hess Operating Company. Ownership has evolved: earlier arrangements involved Petronas Carigali-linked PC JDA interests and Hess-linked entities. In 2025,PTTEP acquired the 50% participating interest previously held by Chevron’s Hess units in a USD 450 million transaction,reinforcing the 50:50 Malaysia-Thailand upstream partnership under the MTJDA framework.</p>

<h2>Development History</h2>
<p>Production sharing contracts for MTJDA blocks,including Block A-18,were awarded in 1994. The Cakerawala complex served as the initial development hub,with first production achieved in 2005. Later phases brought on additional fields – Bumi,Suriya,and Bulan – expanding output capacity. A single project-level final investment decision date is not publicly documented. The PTTEP acquisition in 2025 represents the most significant ownership change since project start.</p>

<h2>Production and Reserves</h2>
<p>Block A-18 has been a consistent gas and condensate producer since 2005. In 2025,PTTEP reported gross production of around 600 million standard cubic feet per day of natural gas,split equally between Malaysia and Thailand. The Thailand share accounted for approximately 6% of that country’s domestic gas demand. Condensate is also produced but volumes are not publicly detailed. Field-by-field remaining reserves and decline rates are not fully disclosed in open sources.</p>

<h2>Recent Developments</h2>
<p>In 2025,PTTEP completed the acquisition of a 50% participating interest in Block A-18 from Chevron-linked entities for USD 450 million. The transaction was reported by Reuters and confirmed by PTTEP,which stated the block was producing 600 MMscf/d and was fundamental to power generation in southern Thailand. No other major project-level updates have been publicly reported.</p>

<h2>Related Topics</h2>
<ul>
<li>Malaysia-Thailand Joint Development Area</li>
<li>Carigali Hess Operating Company</li>
<li>Petronas Carigali</li>
<li>PTTEP Joint Development</li>
<li>Cakerawala Gas Field</li>
<li>Bumi Oil and Gas Field</li>
<li>Bulan Oil and Gas Field</li>
<li>Suriya Oil and Gas Field</li>
<li>Puteri Cakerawala FSO</li>
<li>Gulf of Thailand offshore gas production</li>
<li>Cross-border gas supply in Southeast Asia</li>
</ul>

<h2>Sources</h2>
<ul>
<li><a href="https://www.gem.wiki/Block_A-18_Oil_and_Gas_Project_%28Malaysia%2C_Thailand%29" rel="nofollow noopener" target="_blank">Global Energy Monitor,Block A-18 Oil and Gas Project (Malaysia,Thailand)</a></li>
<li><a href="https://www.gem.wiki/CHESS/Block_A-18_Oil_and_Gas_Concession_%28Thailand-Malaysia%29" rel="nofollow noopener" target="_blank">Global Energy Monitor,CHESS/Block A-18 Oil and Gas Concession</a></li>
<li><a href="https://www.mtja.org/development" rel="nofollow noopener" target="_blank">Malaysia-Thailand Joint Authority,Block A-18 Development</a></li>
<li><a href="https://www.mtja.org/operator" rel="nofollow noopener" target="_blank">Malaysia-Thailand Joint Authority,Contractors and Operators</a></li>
<li><a href="https://www.pttep.com/en/newsroom/press-releases/1071/pttep-strengthens-energy-security-for-thailand-acquiring-chevron-s-interest-to-expand-investment-in-mtjda-s-block-a-18" rel="nofollow noopener" target="_blank">PTTEP,PTTEP Strengthens Energy Security for Thailand by Acquiring Chevron’s Interest in MTJDA Block A-18</a></li>
<li><a href="https://www.reuters.com/business/energy/thailands-pttep-buys-50-offshore-gas-block-chevron-450-million-2025-07-28/" rel="nofollow noopener" target="_blank">Reuters,Thailand’s PTTEP Buys 50% of Offshore Gas Block from Chevron</a></li>
<li><a href="https://www.enerdata.net/publications/daily-energy-news/thailands-pttep-acquires-50-chevrons-offshore-gas-block-us450m-deal.html" rel="nofollow noopener" target="_blank">Enerdata,Thailand’s PTTEP Acquires 50% of Chevron’s Offshore Gas Block</a></li>
<li><a href="https://www.offshore-technology.com/marketdata/oil-gas-field-profile-block-a-18-conventional-gas-field-malaysia-thailand-joint-development-area/" rel="nofollow noopener" target="_blank">Offshore Technology,Block A-18 Conventional Gas Field,Malaysia-Thailand Joint Development Area</a></li>
<li><a href="https://www.upstreamonline.com/finance/pttep-pays-450-million-for-chevrons-strategic-southeast-asia-asset/2-1-1850643" rel="nofollow noopener" target="_blank">Upstream,PTTEP Pays USD 450 Million for Chevron’s Strategic Southeast Asia Asset</a></li>
<li><a href="https://songkhla.customs.go.th/data_files/418e93427077b280ae76e48f91c2a396.pdf" rel="nofollow noopener" target="_blank">Malaysia-Thailand Joint Authority,Annual Report and Audited Financial Statements 2021</a></li>
</ul>

IEPTC reference profile for Block A - 18 Oil and Gas in Malaysia - Thailand Joint Development Area,covering asset type,location,development status,and upstream industry context.

Block A - 18 Oil and Gas Project,Malaysia - Thailand Joint Development Area

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Block A - 18 Oil and Gas Project,Malaysia - Thailand Joint Development Area

Block A - 18 Oil and Gas Project,Malaysia - Thailand Joint Development Area

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