However, the extensive oil seeps associated with both fields had been known to the local Malagasy population for centuries.

Sometimes gravity and magnetic studies are conducted, and oil seeps and spills are mapped to find potential areas for hydrocarbon occurrences.

In 1862, A. M. Cassaday drilled for petroleum six miles north of Cañon City, close to a known oil seep.

The creekologist would also keep an eye peeled for oil seeps, gas bubbles or other signs of oil.

For thousands of years prior to European settlement in America, Native Americans in the California territory excavated oil seeps.

Most hydrocarbons migrate to the surface as oil seeps, but some will get trapped.

Ground collection of oil consisted of gathering it from where it occurred naturally, such as from oil seeps or shallow holes dug into the ground.

Tapping the tree involves cutting a well into which the oil seeps and where it can be easily collected.

In March 2012, "persistent oil seep" near the Macondo well was again reported.

These oil seeps, which are areas where oil spontaneously escapes the earth in either gas or liquid form, were common across the northern Pennsylvania landscape.