地质科学2025，Vol.60Issue(4)：941-952,12.DOI:10.12017/dzkx.2025.062
鄂尔多斯盆地西缘断褶带沙井子段地质结构特征及油气勘探潜力
Geological structure characteristics and oil-gas prospecting potential of the Shajingzi section of the fault-fold belt in the western margin of the Ordos Basin
摘要
Abstract
The southern section of the fault fold belt in the western margin of the Ordos Basin develops four large faults in the north-south direction from east to west,which are Huianbu-Shajingzi,Qinglongshan-Pingliang,Weizhou-Anguo,and Qingtongxia-Guyuan.The Shajingzi section is hold by the four large faults.Controlled by the overturning stress on the west side,the erosion of the thrust sheet strata has the characteristics of"strong in the west and weak in the east".The Jixian System is exposed in the Yanjiawan thrust sheet,the Jurassic to Carboniferous of the Yindongzi thrust sheet is basically completely eroded,and the Shajingzi thrust sheet is intact.According to the differences in structural characteristics,each thrust sheet can be divided into a forward thrust zone,an in-sheet deformation zone and a footwall hidden zone.The strata of the forward thrust zone are steep,and the apparent dip angle is nearly 70°.The structure of the in-sheet deformation zone and the footwall hidden zone,which is more stable,has developed anticline,broken anticline,and broken nose structures.On the basis of the geological structure study,the article pointed out two main types of oil and gas reservoirs can be formed in the Shajingzi section:one is the"self-generate and self-storage"shale oil and gas reservoir of the Ordovician Wulalike Formation,which has a thickness of more than 100 meters of the shale stone,with the average TOC of 1.23％and Ro 0.98％～1.87％.The drilling of well YT3 encounters an industrial oil flow of 5.3 t/d,which confirmed the good exploration potential of this type of oil and gas reservoir with 670 km2 favorable area.The other type is the Upper Paleozoic tectonic-lithologic sandstone reservoirs,which are distributed in the Shajingzi thrust sheet with 368 km2 favorable area.关键词
鄂尔多斯盆地/西缘断褶带/沙井子段/逆冲席/构造特征/演化过程/油气勘探潜力Key words
Ordos Basin/Fault-fold belt in the western edge/Shajingzi section/Thrust sheet/Structural characteristics/Evolution process/Oil-gas prospecting potential分类
天文与地球科学引用本文复制引用
陈思谦,任军峰,王玮,井向辉,张小宝,王红伟,王乐立..鄂尔多斯盆地西缘断褶带沙井子段地质结构特征及油气勘探潜力[J].地质科学,2025,60(4):941-952,12.基金项目
中国石油鄂尔多斯盆地风险勘探领域和目标研究、工程技术攻关及现场试验项目(编号:2023YQXNCS001-05)和中国石油东方地球物理勘探有限责任公司油气勘探新领域综合研究项目(编号:2023YQX10111)资助 （编号:2023YQXNCS001-05）
