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

Key words: 
• Jimusar sag /
• Lucaogou Formation /
• shale /
• hydrocarbon potential /
• organic geochemistry

Abstract: 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.