CNOOC Limited strictly complies with the environmental laws and regulations of the countries and regions where it operates. The Company has formulated the Measures for Ecological Environmental Protection and 3 detailed implementation rules for ecological and environmental protection management covering our headquarters and all subsidiaries. In addition, it has established 10 additional administrative measures and 8 detailed rules, including the Administrative Measures for Health, Safety and Environmental Management of Construction Projects and the Implementation Rules for the “Three Simultaneity” Management of Safety and Environmental Protection in Construction Projects, to continuously enhance the development of its environmental management system. It has established a standardized environmental management mechanism and set up dedicated management departments within the subsidiaries to promote the implementation of environmental protection initiatives.
In 2025, CNOOC Limited experienced no environmental incidents and incurred no significant administrative penalties related to environmental pollution.
All subsidiaries of CNOOC Limited have well-established HSE management systems and strictly implement ISO 14001 environmental management system standards. As of the end of 2025, 2 subsidiaries of CNOOC Limited obtained GB/T 24001-2016 and ISO 14001:2015 environmental management system certification, with a certification coverage rate of approximately 52% based on production.
CNOOC Limited conducts regular environmental impact assessments through annual internal audits, supervisory monitoring, environmental risk inspections across relevant subsidiaries, and periodic ecological risk consultations to identify and evaluate environmental risk factors in its operations. Meanwhile, following the principle of targeted assistance, the Company provides special guidance on discharge permit management for some newly commissioned entities, continuously improving compliance management levels and environmental governance efficiency. During the reporting period, the Company implemented supervisory monitoring on 16 offshore sewage facilities, 3 onshore terminals, and 2 coalbed methane operation areas. A total of 172 sets of monitoring data were issued throughout the year, and 69 problems were rectified. The rectification completion rate exceeded 95% during the year. This effectively promoted the rectification of environmental problems and the establishment of long-term mechanisms, laying a strong foundation for the continuous improvement of environmental governance capabilities.
The Company implements hierarchical environmental risk management and control in accordance with the Rules for Enterprise Environmental Risk Management. The Company systematically carries out risk investigation, hazard management, and emergency drills. In 2025, the Company revised and released the Special Emergency Plan for Environmental Incidents, strengthening the environmental risk management and control system and maintaining the bottom line of marine ecological environment safety. In 2025, the Company did not discover environmental anomalies in relevant key marine areas.
CNOOC Limited attaches great importance to environmental protection publicity and training. Through developing special courses for environmental professionals and holding "Ecological and Environmental Protection Week" activities, the Company creates a strong environmental protection culture atmosphere. In 2025, the Company achieved 100% training coverage for personnel involved in environmental efforts.
The Company is committed to the principle of "increasing reserves and production of oil and gas in coordination with energy conservation and carbon reduction". We are committed to establishing a production system centered on conservation and guided by sustainability.
In 2025, the Company continued to conduct energy audits, regularly tracking and monitoring energy use and the achievement of energy conservation targets, managing energy efficiency risks, and identifying opportunities for improvement.
CNOOC Limited adheres to the water management approach of "giving priority to water conservation, promoting spatial balance, implementing systematic governance, and leveraging both regulatory and operational measures."
With a global perspective, CNOOC Limited upholds ecological protection as a core responsibility and has established the action principle of "Eco-Guard: Protecting Ecology, Advancing Globally." The Company focuses on 5 key areas: governance enhancement, undertaking projects, assisting research, raising awareness, and driving collaboration to continuously contribute to ecological protection and restoration.
Since 2012, CNOOC Limited has been the primary donor to the CNOOC Foundation of Marine Environment and Ecological Protection (hereinafter referred to as the "CNOOC Foundation" or the "Foundation"). The Company has made ongoing investments in supporting the Foundation's efforts in marine biodiversity conservation, public awareness campaigns on marine ecological protection, and research on environmental policies and technologies. As of the end of 2025, the Foundation had initiated nearly 220 marine ecological and environmental protection projects, with a cumulative investment of nearly RMB 220 million, playing an active role in ecological protection and sustainable development.
Governance Enhancement
The Company adheres to the principle of "prioritizing ecological protection" and "paying equal attention to environmental protection and resource development". We abide by the red lines of ecological protection while proactively enhancing ecological environmental management and technological capabilities.
CNOOC Limited strictly complies with the Marine Environmental Protection Law of the People's Republic of China, the Environmental Protection Law of Uganda, and other laws and regulations in all operating locations, continuously improving its internal management system. The Company has formulated a series of internal systems, including the Measures for Ecological Environmental Protection, the Management Rules for Ecological Protection and Pollution Prevention and Control, the Management Rules for QHSE Compliance, and the Management Rules for Upstream Offshore Project Environmental Impact Assessment and Sea Area Use. During the year, the Company revised the Implementation Rules for the “Three Simultaneity” Management of Safety and Environmental Protection in Construction Projects to ensure that business activities comply with environmental protection laws and regulations. During project operations, through applying environmental protection technologies and measures, the Company minimizes the impact on local ecosystems and strives to achieve environmental friendliness and ecological balance.
In strict adherence to the management and control requirements of "Three Lines and One List," CNOOC Limited prioritizes ecological protection and green development, ensuring that the entire project construction and operation comply with environmental protection standards. In 2025, guided by the CNOOC Group's Five-Year Action Plan for Ecological Environmental Protection and adhering to the working principle of "overall promotion, highlighting key points, and coordinating from top to bottom," the Company systematically investigated and rectified environmental hazards, improved environmental risk prevention and control and ecological environmental protection management systems, and continued to strengthen pollution prevention and control. The Company focuses on the management of offshore production water and volatile organic compounds (VOCs), promotes the digital and intelligent transformation of environmental management, strengthens personnel capacity building, and effectively improves the level of environmental risk prevention and control and compliance management.
Undertaking Projects
CNOOC Limited follows the relevant laws and regulations on ecology and environmental protection in the countries and regions where it operates. The Company continues to promote the Five-Year Action Plan for Ecological and Environmental Protection, optimizes development plans, implements ecological compensation and diversified restoration, builds an ecological restoration system that prioritizes natural recovery supplemented by artificial restoration, participates in degraded habitat improvement projects, carries out ecological restoration and compensation projects such as artificial propagation and release, well-site restoration, and mangrove protection, and contributes CNOOC Limited's strength to the improvement of the ecological environment.
In 2025, CNOOC Limited and all subsidiaries actively carried out multiple ecological protection projects to promote the restoration of biodiversity in operating locations. All affiliated entities actively participate in various ecological restoration work such as artificial propagation and release , vegetation greening, and soil and water conservation. Through scientific and effective ecological restoration methods, they ensure the sustainable utilization of the ecological environment and biological resources in operation areas, demonstrating responsibility for ecological stewardship.
CNOOC Limited's main business is concentrated offshore and its land operations are limited, so the overall impact on the land and terrestrial ecological environment is small. In limited land operation areas, the Company actively carries out ecological restoration.
In 2025, CUCBM carried out ecological restoration projects such as soil and water conservation, construction of temporary drainage ditches, and artificial afforestation. Seedlings were planted around 33 well-sites, with a total land restoration area of 84.09 hectares and a total of 15.4 hectares of grass seeds sown.In 2026, the Company will continue to carry out land restoration projects and plans to carry out projects such as site leveling, recultivation, sowing grass seeds, planting trees, and building interception and drainage, which are expected to cover 60 well-sites.
Assisting Research
CNOOC Limited, through the Foundation, provides financial support to scientific research institutions for marine ecological protection policy and technical research projects, driving technological innovation and professional development in the field. In 2025, the CNOOC Foundation funded 13 research projects including comprehensive data collection and data product research and development for marine ranches, research on technical guidelines for environmental impact assessment in the offshore oil and gas industry, and research on re-injection specifications for fracturing flowback fluid and produced water in unconventional gas fields. These research projects provide multi-dimensional, in-depth, and more solid theoretical and technical support for the sustainable utilization of marine resources and the stability and restoration of the marine ecological environment.
Raising Awareness
CNOOC Limited considers raising public awareness of ecological protection as a crucial responsibility. Through organizing various forms of public education activities, the Company makes the concept of ecological protection deeply rooted in people's hearts. In 2025, the Company continued to invest special funds to support a series of public welfare publicity activities for marine environmental protection. Through funding the annual marine environmental protection conference, producing "Eye of the Secret Realm" infrared camera survey videos, Chinese white dolphin protection publicity, and other forms, the Company raises public awareness and protection consciousness of the marine environment, ecology, and resources.
Meanwhile, the CNOOC Foundation also continues to focus on marine environmental protection public welfare publicity activities. By funding popular science education, public welfare activities, and promotional materials, it enhances public awareness and participation in marine ecological protection and expands its public welfare impact in the field of marine ecological protection.
Driving Collaboration
CNOOC Limited has established good cooperative relations with scientific research institutions and social organizations to jointly promote various ecological protection work. In terms of ecological restoration, we have gathered professional forces from various parties to implement precise policies to improve the marine ecology. By carrying out ecological restoration projects, jointly building scientific and technological innovation platforms, holding publicity activities, and other protection work, we have formed a united force for ecological protection and effectively promoted the in-depth and efficient development of marine ecological protection work.
Environmental Management
The Company strictly complies with the environmental laws and regulations of the countries and regions where it operates. It has established a standardized environmental management mechanism and set up dedicated management departments within its subsidiaries to promote the implementation of environmental protection initiatives. All subsidiaries have well-established HSE management systems, and Tianjin Branch has obtained GB/T 24001-2016/ISO 14001:2015 environmental management system certification.
In 2024, CNOOC Limited experienced no environmental incidents and incurred no administrative penalties related to environmental pollution.
The Company prioritizes environmental awareness and training. In 2024, the Company achieved 100% training coverage for personnel involved in environmental efforts. During the "Beautiful CNOOC and Green Development" Environmental Protection Week, we collected 54 ecological protection case studies, organized 724 themed activities, and engaged a total of 15,492 participants.
Energy Management
CNOOC Limited is committed to the principle of "increasing reserves and production of oil and gas in coordination with energy conservation and carbon reduction". We are committed to establishing a production system centered on conservation and guided by sustainability. We strictly comply with the Law of the People's Republic of China on Conserving Energy and other relevant regulations, putting in place internal management policies such as the Energy Saving and Low Carbon Management Measures and the Carbon Emission Metrics Statistical Standards to enhance energy management capabilities.
Water Resource Management
CNOOC Limited strictly follows internal policies such as the Rules for Water Conservation Management, we have carried out special water resource risk assessments and implemented measures including enhancing technological upgrades and reinforcing integrated wastewater management to ensure comprehensive water resource management. During the reporting period, the Company had no significant problems in sourcing water.
CNOOC Limited’s technical measures on water conservation
Biodiversity Conservation
With a global perspective, CNOOC Limited upholds ecological protection as a core responsibility and has established the action principle of “Eco-Guard: Protecting Ecology, Advancing Globally”. The Company focuses on 5 key areas: governance enhancement, undertaking projects, assisting research, raising awareness, and driving collaboration to continuously contribute to ecological protection and restoration.
Since 2012, CNOOC Limited has been the primary donor to the CNOOC Foundation of Marine Environment and Ecological Protection (hereinafter referred to as the “CNOOC Foundation” or the “Foundation”). The Company has made ongoing investments in supporting the Foundation’s efforts in marine biodiversity conservation, public awareness campaigns on marine ecological protection, and research on environmental policies and technologies. As of the end of 2024, the Foundation had initiated nearly 200 marine ecological and environmental protection projects, with a total investment exceeding RMB 200 million, playing an active role in ecological protection and sustainable development.
Governance Enhancement
CNOOC Limited follows closely the evolving environmental regulations of the countries and regions in which it operates. The Company formulates and refines policies such as the Measures for Ecological Environmental Protection and the Management Rules for Ecological Protection and Pollution Prevention and Control, ensuring full compliance with environmental laws. In strict adherence to the management and control requirements of “Three Lines and One List”, we prioritize ecological protection and green development, ensuring that the entire project construction and operation comply with environmental protection standards.
Undertaking Projects
CNOOC Limited responded to the CNOOC Group's Five-Year Action Plan for Ecological and Environmental Protection by optimizing development plans, implementing voluntary ecological compensation and diversified restoration, and establishing an ecological restoration system that prioritizes natural recovery supplemented by artificial restoration. The Company participated in degraded habitat improvement projects and carried out ecological restoration and protection initiatives in multiple marine and terrestrial areas. In 2024, CNOOC Limited and its subsidiaries actively carried out various ecological protection projects to promote biodiversity restoration in operational areas. The Company invested over RMB 90 million to enhance fishery resources by artificial propagation and release across the Bohai Sea, East China Sea, and South China Sea, significantly boosting biological resources in these regions. Zhanjiang Branch spearheaded the establishment of China's first public trust project focused on mangrove ecological protection, "Offshore Saihanba" Blue Carbon Promotion Public Trust Plan Mangrove Protection Project, contributing to the conservation of mangroves.
Assisting Research
CNOOC Limited, through the Foundation, provides financial support to scientific research institutions for marine ecological protection policy and technical research projects, driving technological innovation and professional development in the field. From 2020 to 2024, the CNOOC Foundation funded 52 marine ecological protection policy and technical research projects. These included studies on reducing the impact of offshore oil and gas development, integrated development of offshore wind and aquaculture, governance of natural protected areas, marine resource conservation, and targeted environmental management research for the Yellow River Estuary, Liaohe River Estuary, and Nanji Islands. These efforts provided multi-dimensional, indepth and robust theoretical and technical support for the sustainable use of marine resources and the stability and restoration of marine ecosystems.
Raising Awareness
CNOOC Limited considers raising public awareness of ecological protection as a crucial responsibility. Through diverse public education activities, such as supporting the "Eye of the Secret Realm" program and marine ecological protection public awareness, the Company has strengthened public awareness of environmental protection. In the meantime, the CNOOC Foundation focuses on marine ecological protection public awareness, funding science popularization education, public welfare activities, and promotional materials. These initiatives enhance public understanding and engagement in marine ecological protection and expand the foundation's influence in the field of marine ecological protection.
Driving Collaboration
CNOOC Limited has established strong partnerships with research institutions and social organizations to jointly carry out ecological restoration projects, build scientific innovation platforms, and organize awareness campaigns. These collaborations form a united force for ecological protection, promoting in-depth progress in conservation efforts.
