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Seismic reflection survey being conducted in Saudi Arabia, circa 1960.A controlled explosion generates seismic waves that are detected by geophones.. Visible surface features such as oil seeps, natural gas seeps, pockmarks (underwater craters caused by escaping gas) provide basic evidence of hydrocarbon generation (be it shallow or deep in the Earth).
Pertamina fuel station in Bali. PT Pertamina (Persero) [a] is an Indonesian state-owned oil and natural gas corporation, headquartered in Jakarta. [3] It was created in August 1968 by the merger of Pertamin (established 1961) and Permina (established in 1957).