page_title: Petroleum seep
section_title: Modern extraction and industry
hierarchical_section_title: Petroleum seep / Modern extraction and industry
caption_attribution_description: English: Pitch Lake near La Brea on the Island of Trinidad; close view of embedded wood.
context_page_description: A petroleum seep is a place where natural liquid or gaseous hydrocarbons escape to the earth's atmosphere and surface, normally under low pressure or flow. Seeps generally occur above either terrestrial or offshore petroleum accumulation structures. The hydrocarbons may escape along geological layers, or across them through fractures and fissures in the rock, or directly from an outcrop of oil-bearing rock.
  Petroleum seeps are quite common in many areas of the world, and have been exploited by mankind since paleolithic times. Natural products associated with these seeps include bitumen, pitch, asphalt and tar. In locations where seeps of natural gas are sufficiently large, natural "eternal flames" often persist. The occurrence of surface petroleum was often included in location names that developed; these locations are also associated with early oil and gas exploitation as well as scientific and technological developments, which have grown into the petroleum industry.
context_section_description: During the nineteenth and the beginning of the twentieth century, oil seepages in Europe were exploited everywhere with the digging, and later drilling, of wells near to their occurrences and the discovery of numerous small oil fields such as in Italy.
  The modern history of petroleum exploitation, in relation to extraction from seeps, began in the 19th century with the refining of kerosene from crude oil as early as 1823, and the process of refining kerosene from coal by Nova Scotian Abraham Pineo Gesner in 1846. It was only after Ignacy Łukasiewicz had improved Gesner's method to develop a means of refining kerosene from the more readily available "rock oil" ("petr-oleum") seeps in 1852 that the first rock oil mine was built near Krosno in central European Galicia (Poland/Ukraine) in 1853. In 1854, Benjamin Silliman, a science professor at Yale University, was the first American to fractionate petroleum by distillation. These discoveries rapidly spread around the world.
  The world's first commercial oil well was drilled in Poland in 1853, and the second in nearby Romania in 1857. At around the same time the world's first, but small, oil refineries were opened at Jasło in Poland, with a larger one being opened at Ploiești in Romania shortly after. Romania is the first country in the world to have its crude oil output officially recorded in international statistics, namely 275 tonnes. By the end of the 19th century the Russian Empire, particularly in Azerbaijan, had taken the lead in production.
  The first oil "well" in North America was in Oil Springs, Ontario, Canada in 1858, dug by James Miller Williams. The US petroleum industry began with Edwin Drake's drilling of a 69-foot (21 m) oil well in 1859 on Oil Creek near Titusville, Pennsylvania, both named for their petroleum seeps.
  Other sources of oil initially associated with petroleum seeps were discovered in Peru's Zorritos District in 1863, in the Dutch East Indies on Sumatra in 1885, in Persia at Masjed Soleiman in 1908, as well as in Venezuela, Mexico, and the province of Alberta, Canada.
  By 1910, these too were being developed at an industrial level. Initially these petroleum sources and products were for use in fueling lamps, but with the development of the internal combustion engine, their supply could not meet the increased demand; many of these early traditional sources and "local finds" were soon outpaced by technology and demand.
caption: Natural asphalt with embedded wood, Pitch Lake, Trinidad and Tobago. Asphalt has been produced from Pitch Lake since 1851.
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