In a wing of a massive former bank building here in the French capital, dozens of youthful women and men gather around computer screens. This collection of around 100 mathematicians, software engineers and petroleum analysts are bent on shaking up the opaque world of information on the world energy markets. On a recent day, one group was sifting satellite images for clues to oil output in Venezuela — once a major oil producer but now in decline. Another cluster was checking the levels of crude in a tank farm in China. The company, named Kayrros after the Greek deity of opportunity, is headed by Antoine Rostand, a petroleum engineer turned entrepreneur, and several other partners. Mr. Rostand said that when he ran the business consulting unit of the oil field services company Schlumberger — for about a decade ending in 2016 — he became frustrated at the […]