“深海一号”大气田是我国首个自主发现和勘探开发的超深水大气田，探明天然气储量超千亿立方米。为经济高效地开发该气田，我国首次采取“半潜式生产储卸油平台+水下生产系统+海底管道”的全海式开发模式，通过自主设计、优化组织与管理、强化技术攻关与创新，成功建造了全球首座10 万吨级深水半潜式生产储卸油平台——“深海一号”能源站。本文在简要阐述“深海一号”大气田开发的建设背景和面临的挑战基础上，介绍了深水气田开发模式的优选与突破，深入总结了“深海一号”能源站在设计与建设过程中的半潜式平台立柱储油、超大吨位开口结构物预斜回正荷载横向转移、超大结构物半漂浮精准合拢等重大技术创新突破与价值经验，以期为今后我国深水、超深水油气田高效开发及半潜式平台高水平建设提供有益参考。

The “Deep Sea One” energy station is the first ultra-deep-water large-scale gas field that is independently explored and developed by China and its proven reserves of natural gas exceed hundreds of billions of cubic meters. This energy station is also the first 100 000-ton deep-water semi-submersible production, storage, and offloading platform worldwide; it adopts a whole sea development mode that integrates a semi-submersible production, storage, and offloading platform, a subsea production system, and submarine pipelines. Moreover, the energy station is built by conducting independent design, optimizing organization and management, and strengthening technical research and innovation. This paper first reviews the construction background and challenges, introduces the optimization and breakthroughs of the development modes of deep-water gas fields, and then summarizes the major technological breakthroughs and experiences during the design and construction of this energy station, including oil storage in columns of semi-submersible platforms, load lateral transfer of super-tonnage open structures via pre-inclination and return, and half-floating integrated precisely of super large structures. This study is hoped to provide a useful reference for efficient development of deep-water and ultra-deep-water oil and gas fields and for high-level construction of semi-submersible platforms.