Abstract: The 10 ASEAN countries (Indonesia, Thailand, Singapore, the Philippines, Malaysia, Brunei, Vietnam, Laos, Myanmar, and Cambodia) play an important role in the international energy market and energy geopolitics with their abundant oil and gas resources and crucial geographical position. Based on the comprehensive analysis of the current situation of ASEAN countries' oil and gas development, strategies, relevant projects, and international cooperation, it is discovered that Indonesia, Malaysia, Vietnam, and Brunei have more advantages in marine oil and gas reserves and utilization than other ASEAN countries. In addition to making national investment, these countries are actively attracting international investment to make up for the technical and financial constraints on the exploration and utilization of offshore oil and gas. However, as the growing demand for oil and gas has far exceeded the output of ASEAN countries, many countries are transforming to net oil and gas importers. Accelerating the exploration and development of deep-water oil and gas resources, applying digital technology, taking measures to improve energy efficiency, and developing renewable energy is becoming the opportunities for ASEAN countries to promote the sustainable development of energy, and also providing opportunities for China to strengthen the cooperation with ASEAN countries in the energy area.

Key words: ASEAN, Offshore oil and gas, Development and Utilization, International cooperation, Sustainable Development