油型气湿度和成熟度的关系研究

Relationship between Petroliferous Gas Humidity and Maturity

通过分析国内外鄂尔多斯、四川、Fort Worth、Arkoma等盆地373个样品油型气湿度与镜质体反射率的关系,发现随热演化程度升高,油型气湿度变小,二者呈负对数相关关系,油型气湿度与热演化程度的这种负对数相关关系,可为页岩气勘探和天然气资源评价提供科学依据。同时,分析天然气湿度与热成熟度关系曲线图,发现干酪根降解气湿度随着热演化程度升高迅速减小,而裂解气湿度相对稳定,这也证实原油裂解气与干酪根直接降解生气的分子热动力学模型存在较大差异。

Through relationship analysis between the petroliferous gas humidity and vitrinite reflectance for 373 samples from the Ordos,Sichuan,Fort Worth and Arkoma basins both home and abroad have found that with thermal evolution degree arising,petroliferous gas humidity decreased,and presented negative logarithmic correlativity between them.This kind negative logarithmic correlativity can provide scientific basis for shale gas exploration and natural gas resources assessment.Meanwhile,the analysis of natural gas humidity and thermal maturity relationship curves has found that the kerogen degradation gas humidity will quickly decrease with arising of thermal evolution degree,while the humidity of splitting decomposition gas relatively stable.Thus also verified the molecular thermodynamic models of crude oil splitting decomposition gas and kerogen direct degradation gas has existed large differences.