吉木萨尔凹陷芦草沟组泥质岩类生烃潜力差异性分析

Difference in Hydrocarbon Generation Potential of the Shaly Source Rocks in Jimusar Sag,Permian Lucaogou Formation

吉木萨尔凹陷芦草沟组为吉木萨尔凹陷最主要的烃源岩,该套烃源岩岩性多样,多为过渡性岩类,为了研究不同泥质岩类生烃潜力特征的差异性,以录井岩芯为基础,将泥质岩类划分为纯泥岩、砂质泥岩、灰质泥岩和云质泥岩四类,并主要从有机地球化学的角度对四类岩性泥岩的生烃潜力特征做出评价。结果表明,纯泥岩有机质丰度较云质泥岩、灰质泥岩、砂质泥岩略高;纯泥岩有机质类型最好,其次是灰质泥岩和云质泥岩,砂质泥岩干酪根类型最差。在此基础上,结合HI分析,认为纯泥岩生烃潜力最高,其次是云质泥岩、砂质泥岩,灰质泥岩生烃潜力最差。

The Lucaogou Formation,the main hydrocarbon source rocks in Jimus sag,is characterized by various lithology,which are mainly transitional types. Aiming at obtainning the difference in hydrocarbon generation potential characteristics of various sorts of mudstone,shale in this formation is divided into four types based on the logging lithology,which are pure shale,sandy mudstone,lime mudstone and dolomitic mudstone. And an evaluation about hydrocarbon generation potential characteristics of the four types of mudstone is made respectively from the organic geochemistry perspective. The results show that the abundance of organic material of pure shale is higher than other three types of mudstones,like lime mudstone,dolomitic mudstone,and sandy mudstone. Considering the type of organic matter in shale,pure mudstone is the best of them,followed by lime mudstone and dolomitic mudstone,and sandy mudstone is the worst,and combining what has been discussed above and the analysis of HI,it is concluded that pure mudstone shows the greatest hydrocarbon generation potential,followed by lime mudstone and dolomitic mudstone and sandy mudstone.