鄂尔多斯盆地中东部奥陶纪志丹- 横山古隆起厘定及勘探意义
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本文为中国石油股份公司重大专项 “海相碳酸盐岩油气规模增储上产与勘探开发技术研究”项目(编号2023ZZ16YJ01)和长庆油田分公司科技重大专项“鄂尔多斯盆地深部层系构造- 沉积环境、成藏条件与有利勘探区带研究”(编号 2024D1JC06)联合资助的成果


Distribution, evolution and gas exploration significance of Zhidan- Hengshan paleo- uplift in Ordos basin, NW China
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    本研究基于最新的钻井、地震、航磁异常等资料,系统研究了鄂尔多斯盆地奥陶纪志丹- 横山古隆起的区位分布、发育时限、形成演化及控藏效应。研究结果表明,志丹- 横山古隆起呈弧形分布于志丹、横山、榆林一带,为挤压型古隆起,发育时限为奥陶系马家沟组五段早期。在挤压应力影响下,古隆起轴部逐渐变窄、隆起幅度渐次增大,并向西北方向呈弧形迁移,至奥陶系马家沟组五段6亚期基本定型。志丹- 横山古隆起与乌审旗- 靖边古隆起叠加发育,其发育受基底结构属性与周缘构造背景双重控制,两者均发育在盆地结晶基底鄂尔多斯陆块与孔兹岩带的拼合带附近。乌审旗- 靖边古隆起主体位于孔兹岩带一侧,向北与伊盟古陆衔接,形成于前寒武纪,在盆地北部挤压应力的影响下,结晶基底孔兹岩带上覆长城系裂陷槽边缘挤压隆升;志丹- 横山古隆起主体位于鄂尔多斯陆块一侧,向南与庆阳古隆起衔接,主要与中—晚奥陶世由被动陆缘向活动陆缘构造转换有关,在盆地西南缘持续挤压的远程传递效应影响下,鄂尔多斯陆块向孔兹岩带挤压隆升。乌审旗- 靖边古隆起与志丹- 横山古隆起屹立南北、东西交织,控制了奥陶系盐下天然气聚集成藏,值得重点勘探。

    Abstract:

    Based onrecent drilling, seismic, and aeromagnetic anomalies, a systematic study was conducted on the location distribution, development time, formation and evolution, and reservoir control effects of the Ordovician Zhidan Hengshan ancient uplift in the Ordos basin. The results indicate that the Zhidan Hengshan ancient uplift is distributed in an arc shape in the Zhidan, Hengshan, and Yulin areas. It is a compressional uplift that developed during the early stage of the fifth Member of the Ordovician Majiagou Formation. Under the influence of compressive stress, the uplift’s axis gradually narrowed, its amplitude increased, and it migrated northwestward in an arc- shaped pattern, reaching its maximum development during the deposition of the fifth and sixth sub- sections of the Majiagou Formation. The Zhidan Hengshan ancient uplift displays a superimposed relationship with the Wushenqi Jingbian ancient uplift. Their development is controlled by a complex interplay between basement structural attributes and the peripheral structural background. Both uplifts are localized within weak structural zones where the crystalline basement of the basin intersects with the Ordos landmass and the Kongziyan belt. The main body of the Wushenqi Jingbian ancient uplift is located along one side of the Kongziyan belt, connecting with the Yimeng ancient landmass to the north, which formed during the Precambrian period. Compressive stress in the northern part of the basin uplifted the crystalline basement along the Kongziyan belt, which is overlaid by the edge of the Great Wall series trough. The main body of the Zhidan Hengshan ancient uplift is located along one side of the Ordos block, connecting with the Qingyang ancient uplift to the south. Its formation is primarily related to the transition from passive to active continental margins during the Middle- Late Ordovician period. Continuous compression on the southwestern edge of the basin remotely uplifted the Ordos block towards the Kongziyan belt. The interconnected Wushenqi Jingbian and Zhidan Hengshan ancient uplifts control the accumulation of natural gas beneath the Ordovician salt layer, making them worthy of further exploration and attention.

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魏柳斌,任军峰,王前平,武春英,张建伍,师平平.2024.鄂尔多斯盆地中东部奥陶纪志丹- 横山古隆起厘定及勘探意义[J].地质学报,98(12):3619-3629.
WEI Liubin, REN Junfeng, WANG Qianping, WU Chunying, ZHANG Jianwu, SHI Pingping.2024. Distribution, evolution and gas exploration significance of Zhidan- Hengshan paleo- uplift in Ordos basin, NW China[J]. Acta Geologica Sinica,98(12):3619-3629.

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  • 收稿日期:2024-06-24
  • 最后修改日期:2024-08-26
  • 录用日期:2024-08-26
  • 在线发布日期: 2024-12-26