7月21日电，哈萨克斯坦国家石油运输商KazTransOil称，上半年通过阿特劳-萨马拉管道的原油出口增加4%，达510万吨。

Group 1 - The core point of the article is that KazTransOil, the national oil transporter of Kazakhstan, reported a 4% increase in crude oil exports through the Atyrau-Samara pipeline in the first half of the year, reaching 5.1 million tons [1] Group 2 - The increase in crude oil exports indicates a positive trend for KazTransOil's operations and may reflect broader market conditions [1] - The Atyrau-Samara pipeline is a critical infrastructure for Kazakhstan's oil export strategy, highlighting its importance in the regional oil supply chain [1] - The reported figures suggest that KazTransOil is effectively managing its export capacity amid fluctuating global oil prices [1]