资源环境科技发展态势分析平台

This study proposes a new method for estimating tight oil resources in a closed petroleum system using an alternative mass balance model. The proposed approach primarily derives resource estimates based on a large volume of Rock-Eval pyrolysis data. In addition to leveraging the cost-effective, straightforward, and rapid process, the proposed method has the flexibility to assess the potential of different types of resources, including organic-rich tight (shale) oil and organic-lean tight oil. The method is validated by assessing the oil resource potential of the middle Permian Lucaogou Formation (P₂l) in the Jimusaer depression, Junggar Basin, China. Results indicate that the P₂l contains 1.62 × 10⁹ t (11.91 × 10⁹ bbl) of organic-rich and 2.88 × 10⁹ t (21.17 × 10⁹ bbl) of organic-lean tight oil. Of the organic-rich tight oil, 21% comprises free oil resources, amounting to 0.343 × 10⁹ t (2.521 × 10⁹ bbl). The proposed approach deals sufficiently with the different resources in a petroleum system well and provides a useful tool for estimating the resource potential of an unconventional play.