The amount of gas released from oil inereases from east to west, it can be 12.82 % of gas in free phase expelled from souree roek, it is important part of gas aeeumulation in Western Slope.

• 油溶释放气量可占到源岩游离相天然气排出量的12．82%25，应是西部斜坡区天然气成藏的重要组成部分。