April 9 (Reuters) - Chevron said on Thursday its upstream earnings were expected ‌to rise by $1.6 billion to $2.2 ‌billion in the first quarter versus the fourth ​quarter of 2025, driven by surging oil and gas prices from volatility linked to the Iran war. The conflict, which began ‌on February ⁠28, sent oil prices skyrocketing as much as 65%, with some ⁠oil and gas fields in the Middle East shutting production after the ​Strait of ​Hormuz - a conduit ​for a fifth ‌of global energy flows - was effectively ...