Just this month, BP said that it found a giant deepwater field that might turn out to be the biggest oil discovery ever in the Gulf of Mexico, while Anadarko announced a large find in an “exciting and highly prospective” region off Sierra Leone.

It is normal for companies to discover billions of barrels of new oil every year, but this year’s pace is unusually brisk. New oil discoveries have totaled about 10 billion barrels in the first half of the year, according to IHS Cambridge Energy Research Associates. If discoveries continue at that pace through year-end, they are likely to reach the highest level since 2000.

While recent years have featured speculation about a coming peak and subsequent decline in oil production, people in the industry say there is still plenty of oil in the ground, especially beneath the ocean floor, even if finding and extracting it is becoming harder. They say that prices and the pace of technological improvement remain the principal factors governing oil production capacity.

While the industry is celebrating the recent discoveries, many executives are anxious about the immediate future, fearing that lower prices might jeopardize their exploration drive. The world economy is weak, oil prices have tumbled from last year’s records, corporate profits have shrunk, and global demand for oil remains low. After falling to $34 in December, oil prices have doubled, stabilizing near $70 a barrel. But if the world economy does not pick up, some analysts believe the price could fall again.

Oil companies contend that is not a prospect they can afford. Despite reaping record profits in recent years, many executives have warned that they need prices above $60 a barrel to develop the world’s more challenging reserves. In fact, some exploration activity has already slowed this year, as producers seek better terms from service companies and contractors.