A股午评：沪指半日涨0.15%，油气资源、港口航运板块集体爆发

Market Overview - The three major A-share indices showed mixed performance in the morning session, with the Shanghai Composite Index up by 0.15%, the Shenzhen Component down by 0.16%, and the ChiNext Index down by 0.33% [1] - The North China 50 Index increased by 0.51% [1] - Total market turnover reached 683.8 billion yuan, a decrease of 2.4 billion yuan compared to the previous day [1] - Over 3,600 stocks in the market experienced gains [1] Sector Performance - The oil and gas, port and shipping, nuclear pollution prevention, military industry, and cross-border payment sectors saw significant gains [1] - Notable stocks in the oil and gas sector included Taishan Petroleum (000554), ShenKong Co. (002278), and Ningbo Maritime (600798), all of which hit the daily limit [1] - The cross-border payment sector also surged, with Jida Zhengyuan (003029) reaching the daily limit [1] - The banking sector showed a rebound after a dip, with major banks like Industrial and Commercial Bank of China, China Construction Bank, and Agricultural Bank of China reaching new historical highs [1] Underperforming Sectors - The liquor, gaming, pork, and weight-loss drug sectors experienced notable declines [1] - Key stocks in the liquor sector, such as Yingjia Gongjiu, Shanxi Fenjiu (600809), and Gujing Gongjiu (000596), were among the biggest losers [1] - Pork-related stocks, including Haida Group (002311), Shuanghui Development (000895), and Juxing Agriculture (603477), also saw significant declines [1]