高邮凹陷油气运移特征研究

利用高邮凹陷油气在运移过程中的油气比和甲烷含量的变化推得垂向及侧向运移系数，进而对该区油气运移特征进行了研究。结果表明，该地区油气运移程度具有“下低上高、内低外高”的趋势，即在深凹带，垂向上运移程度及运移系数自下而上依次增加，平面上深凹带和内斜坡带油气运移程度低，而外斜坡带和低凸起运移程度高。整个凹陷油气运移方式为垂向一侧向混合式，但不同二级构造单元油气运移方式有所不同。深凹带相对以垂向运移为主，侧向运移为辅；斜坡带、低凸起带则以侧向运移为主，垂向运移为辅。

Oil and gas migration characteristics in Gaoyou depression

The vertical and lateral migration coefficients were conducted on the basis of the variations of gas-oil ratio and methane content during the course of hydrocarbon migration,and some oil and gas migration characteristics in Gaoyou depression were researched.The results show that the trend of oil and gas migration degree is low in vertical lower part while high in higher part,and low in center while high in margin.The vertical migration degree and migration coefficient increase successively from bottom to top in deep depressed area.And in the whole area,migration degree is low in the deep depressed area and inner slope while high in the outer slope and low heave.Oil and gas migration in the whole depression is combination of vertical and lateral migration,while there are some differences in different secondary structure units.The vertical migration is relatively more dominant than lateral migration in deep depressed area while it's opposite in the around high area.