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Analysis on accumulation conditions and characteristics of gas released from oil in Western Slope

WANG Yan-ying1,2,LI Yong-jun1 (1.China University of Geosciences,Beijing 100083,China;2.Daqing Oilfield Company Ltd.,Daqing 163453,China)  
According to isotope characteristics of gas,this paper considered there is a lot of oil-type gas in Western Slope,they distribute on Taikang uplift zone.The characteristics of oil and gas produced in the same layer indicates that the gas released from oil is the important part of oil-type gas in Western Slope.About 1000m depth displacement between Qijia-Gulong sag and Western Slope is the important condition for gas to release from oil.Calculation results indicate the amount of gas to released from oil is considerable.1 m3 oil migrating from Qijia-Gulong sag to Western Slope can release 20-30 m3 gas.The amount of gas released from oil increases from east to west,it can be 12.82% of gas in free phase expelled from source rock,it is important part of gas accumulation in Western Slope.The gas released from oil can mix with gas in fee phase and form gas reservoirs.It can mix with biogas and form gas reservoirs,too.Taikang uplift zone is the favorable area for gas released from oil to accumulate and form gas reservoirs.
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