松辽盆地南部深层中-高演化阶段烃源岩品质评价标准探讨

目前实施的有机质丰度评价行业标准并不适用于中-高演化阶段烃源岩.为了实现此类烃源岩品质的精细分类评价,该文基于烃源岩原始生烃潜量与残余有机碳含量以及残余生烃潜量关系,建立了不同演化阶段烃源岩有机质丰度评价标准,探讨了烃源岩岩性、干酪根类型以及热演化程度对评价指标界限划分的影响.研究表明,中-高演化阶段烃源岩丰度指标划分...

Discussion on organic matter abundance evaluation criteria of source rocks in deepmiddle-high thermal evolution stage in south Songliao Basin

The existing industry standard of organic matter abundance evaluation is not suitable for the evaluation of source rocks in the middle-high thermal evolution stage.In order to achieve the refined quality evaluation of this kind of source rocks,based on the relationship between original hydrocarbon generation potential and residual organic carbon content,as well as that of original hydrocarbon generation potential and residual hydrocarbon generation potential of source rocks,the evaluation criterion of organic matter abundance of source rocks in different evolution stages was established,and the influence of source rock lithology,kerogen type and thermal evolution degree on the boundary division of evaluation indexes was discussed.The results show that,in the middle-high thermal evolution stage,the boundary of organic matter abundance indexes of source rocks is obviously lower than the industry standard.As a whole,the limit of evaluation index decreases with the increase of thermal evolution degree,and increases with the deterioration of kerogen type.The organic carbon content and hydrocarbon generation potential of carbonaceous mudstone are higher than those of mudstone,maybe they are good gas generating rocks,but not necessarily good oil generating rocks.Due to the differences in lithology,organic matter type and thermal evolution degree of source rocks in different petroliferous basins,it is difficult to unify the evaluation index limits.However,the evaluation criteria of each area can be established by using the method in this paper,which can provide the basis for the refined evaluation of source rocks and the optimization of favorable zones.