Wed, 20 Feb 2019 15:54:07 GMT
2010 Vol.35 No.4
A fluid inclusion fluorescence and microthermometric study was performed on sandstones from the deep Es4 reservoir rocks of the Minfeng (民丰) sag, north of Dongying (东营) depression. Two types of oil inclusions (yellow and blue white fluorescence), one type of gas inclusions (blue white fluorescence), and bitumen inclusions (no fluorescence) were detected within quartz and feldspar minerals. The evolution of hydrocarbon fluid inclusions in the lower Es4 sequence indicates that present oil accumulation was predominantly thermal stress controlled. Homogenization temperatures of aqueous fluid inclusions coexisting with gas-bearing and bitumen-bearing fluid inclusions indicate that oil cracking occurred at temperatures up to 160 ℃, primary condensate or wet gas generation occurred during 170–195 ℃. Oil has cracked into condensate or wet gas in the depth of 4 300– 4 410 m and dry gas and abundant pyrobitumen in the depth of more than 4 410 m in the geological history based on the fluid inclusion extrapolation...
Keywords：oil cracking, fluid inclusion, homogenization temperature, fluorescence, bitumen, pyrobitumen, natural gas, Dongying depression
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