The exact percentage of the Earth’s crust that has been mined or drilled for oil is difficult to calculate, but it is a very small fraction of the Earth’s total crust. Here’s an estimate based on geological considerations:

1. The Earth’s crust:

• The crust’s total volume is estimated to be around 6 billion cubic kilometers.

• Oil exploration and extraction only target specific sedimentary basins where oil reserves are concentrated, which make up about 5% of the Earth’s crust.

2. Mined oil volume:

• Since the late 19th century, humans have extracted roughly 2 trillion barrels of oil (~320 billion cubic meters).

• Comparing this to the Earth’s crust volume, the oil extracted is less than 0.000000005% of the crust’s volume.

Even when considering the entire volume of rock affected by oil exploration (including wells, drilling zones, and reservoirs), the percentage of the crust impacted remains infinitesimally small. Most oil exploration occurs within the upper few kilometers of the crust, within specific oil-bearing regions.