Though petroleum production was not new, this strike was by far the largest the world had ever seen.

This situation began to change in the late 1960's, when large-scale petroleum production began.

The year 1878 marked the beginning of petroleum production in Ecuador.

As a result, petroleum production is extensive in the state.

Another use of injection wells is in natural gas and petroleum production.

Because of the money from petroleum production, there have been many political problems in recent times.

Crude petroleum production increased by more than 43% compared with that of 2004.

These companies currently account for an estimated 98 per cent of the nation's petroleum production.

Offshore oil and gas in California provides a significant portion of the state's petroleum production.

The county also has some petroleum production and large wind farms.