Thailand’s oil sector is built around an apparent contradiction. The country has produced petroleum for decades and still operates active onshore and offshore fields, yet domestic crude is far too limited to support the scale of its economy. Thailand therefore imports most of the crude processed in the country while using a large refining system to supply its own market and sell petroleum products across the region.
This makes Thailand different from a conventional oil-producing state. Its strategic strength lies less in the size of its reserves than in its refineries, ports, storage, product pipelines and commercial position in Southeast Asia. Its main vulnerability is the continuing gap between local production and the crude required by transport, aviation, industry and petrochemical manufacturing.
Refining Capacity Gives Thailand Its Regional Importance
Thailand has one of the largest refining systems in Southeast Asia, with total crude distillation capacity of roughly 1.24 million barrels per day. The system includes major plants operated by Thai Oil, PTT Global Chemical, IRPC, Bangchak, Bangchak Sriracha and Star Petroleum Refining, together with the much smaller Fang refinery in the north.
Most of the large refineries are located in the eastern part of the country, close to deep-water ports, industrial estates and petrochemical facilities. This concentration supports efficient imports and allows refined products to move into the domestic market or to neighbouring countries. It also connects the oil industry closely with Thailand’s manufacturing base and the Eastern Economic Corridor.
Refinery throughput averaged about 1.09 million barrels per day during the first four months of 2026. That operating scale is far larger than domestic crude production, so the refineries depend on regular tanker arrivals and diversified procurement. They convert imported crude into gasoline, diesel, jet fuel, liquefied petroleum gas, fuel oil and petrochemical feedstocks suited to Thai and regional demand.
This downstream capacity gives Thailand a degree of energy security that crude-import figures alone do not show. The country can produce most of the petroleum products it needs and export surpluses, although major refinery shutdowns can still increase product imports temporarily.
Road transport, aviation and petrochemicals support demand, but electric vehicles and fuel-efficiency improvements could weaken growth in gasoline and diesel use. Refineries will increasingly compete on efficiency, product quality and petrochemical integration.
Domestic Fields Make a Useful but Limited Contribution
Thailand’s crude oil production increased during the opening months of 2026, averaging almost 103,000 barrels per day from January through April. That was higher than the 2025 average of about 85,000 barrels per day. When condensate is included, domestic liquids production is larger, but it still covers only a minority of the feedstock entering Thai refineries.
Production is spread across offshore and onshore areas. Important names include Sirikit, the country’s main onshore oil field, as well as offshore producing areas such as Tantawan, Nong Yao, Bualuang, Jasmine and Manora. Individual output changes as new wells enter service, maintenance occurs and mature reservoirs decline. The result is a portfolio of useful but relatively small assets rather than giant fields capable of transforming the national balance.
Thailand had approximately 112 million barrels of proved crude oil reserves at the end of 2023. That reserve base is modest relative to consumption and refinery capacity. Exploration and redevelopment can slow decline or produce temporary gains, but conventional production is unlikely to make the country self-sufficient.
Local production still has economic value. It reduces import requirements, supports technical capability and generates government revenue. Existing fields also benefit from established platforms, pipelines and service networks.
Thailand should encourage commercially sound exploration and improved recovery from mature fields, but it cannot base oil security on the expectation of a major domestic production boom.
Crude Imports Define Thailand’s Main Exposure
Crude imports averaged about 967,000 barrels per day during the first four months of 2026. The scale of these purchases explains why shipping routes, port capacity and supplier diversity are central to Thailand’s oil system.
The Middle East supplied 58% of Thailand’s crude imports in 2025. Far Eastern suppliers provided 19%, while other sources contributed 24%. The mix became more diversified during the first four months of 2026, when the Middle East share fell to 43%, the Far East supplied 26%, and other origins accounted for 31%.
These changes reflect prices, refinery requirements, freight costs and geopolitical conditions. A diversified crude slate allows refiners to respond when one source becomes expensive or difficult to obtain.
Thailand’s exposure is nevertheless clear. Much of the imported oil must travel through major maritime routes linked to the Strait of Hormuz, the Indian Ocean and the Strait of Malacca. Conflict, sanctions, shipping restrictions or a serious accident along these routes could raise costs even when physical supply continues. Because imported crude is priced internationally, exchange-rate movements also affect domestic fuel costs.
Strategic and commercial stocks help manage short interruptions, but inventories cannot replace imports for an extended period. Long-term resilience depends on maintaining several suppliers, adequate storage, reliable receiving terminals and the financial capacity to purchase cargoes during periods of high prices.
Transport Demand Keeps Oil Central to the Economy
Domestic petroleum-product consumption averaged about 1.23 million barrels per day during the first four months of 2026. Diesel and gasoline remain central to road freight, private transport and commercial activity, while jet fuel demand is linked to Thailand’s large tourism and aviation sectors. Oil also supports agriculture, construction, fisheries and industrial operations that cannot immediately switch to electricity.
Thailand has used biofuel blending to reduce some conventional petroleum demand and support domestic agricultural supply chains. Gasohol and biodiesel are established parts of the retail market. Their contribution is constrained by feedstock availability, prices, vehicle compatibility and competing uses for sugarcane, cassava and palm oil.
Retail fuel prices can become politically sensitive because transport costs move quickly through the wider economy. Tax adjustments and the Oil Fuel Fund have been used to moderate price shocks, but prolonged support can create fiscal pressure and delay the transmission of market prices.
Electric vehicles will gradually change passenger-transport demand, but they will not remove the need for oil in the near term. Heavy trucking, aviation, shipping, petrochemicals and many industrial uses are more difficult to electrify. Thailand’s refining system will therefore remain strategically important even if gasoline demand begins to level off.
Thailand’s Oil Future Will Remain Import-Based
Thailand is unlikely to become a major crude producer, but it does not need to be one to retain an important oil industry. Its competitive position comes from converting imported crude into fuels and industrial products, serving a large domestic market and participating in regional trade.
The main priorities are to maintain refinery reliability, diversify crude sources, protect maritime supply, manage inventories and adapt facilities to changing fuel demand. Domestic production can make a useful contribution when investment raises output from existing fields, but it will remain secondary to imported supply.
Over time, electric mobility and lower-carbon policy will reduce growth in some petroleum products. The strongest Thai refiners will respond by improving efficiency, increasing petrochemical integration and producing higher-value or lower-emission fuels. Thailand’s oil security will depend less on discovering a large new field than on operating its import, refining and distribution system with flexibility.
