oil-shown. [ < oiln.1 + shown.1; compare shown.1 12] a natural seepage of petroleum from underground deposits.
ΚΠ
1945 Jrnl. Inst. Petroleum31 173 The distinction between true oil-shows..and accidental contamination..by lubricating oil.
1998 Petroleum Geoscience4 41 Organic geochemical correlations between fluid inclusions and associated oils and oil-shows in Mesozoic reservoirs in the Sleipner area.