AUTHOR=Jiang Yanjiao , Zhou Jian , Zhang Jiaqi , Guo Zhihua , Liu Dan , Li Xueying , Gao Jinbiao TITLE=Trajectory optimization of ultra-short sidetrack horizontal wells in marginal reservoirs JOURNAL=Frontiers in Earth Science VOLUME=Volume 13 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2025.1533309 DOI=10.3389/feart.2025.1533309 ISSN=2296-6463