石油学报 ›› 2018, Vol. 39 ›› Issue (6): 609-619.DOI: 10.7623/syxb201806001

• 地质勘探 •    下一篇

鄂尔多斯盆地西缘马家滩古隆起的厘定、成因及地质意义

何登发1, 邵东波2, 崔永平3, 包洪平2, 开百泽1, 傅定伍1, 曹毓戈1   

  1. 1. 中国地质大学能源学院 北京 100083;
    2. 中国石油长庆油田公司 陕西西安 710018;
    3. 中国石油勘探与生产分公司 北京 100007
  • 收稿日期:2018-03-05 修回日期:2018-04-06 出版日期:2018-06-25 发布日期:2018-07-03
  • 通讯作者: 何登发,男,1967年12月生,1989年获西北大学学士学位,1996年获北京石油勘探开发研究院博士学位,现为中国地质大学(北京)能源学院教授、博士生导师,长期从事盆地构造分析与油气地质综合研究。Email:hedengfa282@263.net
  • 作者简介:何登发,男,1967年12月生,1989年获西北大学学士学位,1996年获北京石油勘探开发研究院博士学位,现为中国地质大学(北京)能源学院教授、博士生导师,长期从事盆地构造分析与油气地质综合研究。Email:hedengfa282@263.net
  • 基金资助:

    国家自然科学基金重点项目(No.41430316,No.40739906)和国家科技重大专项(2017ZX05001-001)资助。

Delineation,formation,and geological significance of Majiatan paleo-uplift at the western margin of Ordos Basin

He Dengfa1, Shao Dongbo2, Cui Yongping3, Bao Hongping2, Kai Baize1, Fu Dingwu1, Cao Yuge1   

  1. 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    2. PetroChina Changqing Oilfield Company, Shaanxi Xi'an 710018, China;
    3. PetroChina Exploration and Production Company, Beijing 100007, China
  • Received:2018-03-05 Revised:2018-04-06 Online:2018-06-25 Published:2018-07-03

摘要:

古隆起对于沉积盆地的构造演化与油气聚集具有重要意义,沉积盆地边缘的古隆起是探讨盆地构造—沉积分异与造山带演化的重要窗口。基于新的二维、三维地震与深钻井资料,从不整合面解析与古构造复原的角度,发现与厘定了鄂尔多斯盆地西缘中段的马家滩古隆起,探讨了其成因机制。研究表明,鄂尔多斯盆地西缘马家滩地区在浅层(石炭系之上)冲断滑脱构造变形系统之下的原地系统中发育古隆起,为基底凸起之上的同沉积隆起,与之相关的不整合主要发育在长城系与蓟县系、蓟县系与中—下寒武统、寒武系与中—下奥陶统、奥陶系与上石炭统之间。马家滩古隆起发生了3次较大幅度的隆升剥蚀,缺失青白口系、震旦系、上寒武统、上奥陶统、志留系—下石炭统。寒武系、奥陶系、石炭系底部不整合面的时间间隔分别约为94.0 Ma、18.7 Ma与152.9 Ma。长城纪以来,马家滩古隆起经历了3期伸展—聚敛旋回,但拉张与挤压程度不大。长城纪中期正断层活动形成古隆起雏形,蓟县系向其超覆,蓟县纪末期隆升剥蚀并定型;古生代下沉与隆升幕式发展;上石炭统—二叠系的稳定沉积使其埋藏,表现为继承性古隆起。马家滩古隆起对寒武系—奥陶系高能相带及白云岩、岩溶等储集体的发育有重要控制作用,中元古界油气成藏组合与下古生界油气成藏组合为有利的远景勘探目标。

关键词: 古隆起, 不整合, 成因机制, 马家滩地区, 鄂尔多斯盆地西缘

Abstract:

Paleo-uplift has an important significance to the tectonic evolution and hydrocarbon accumulation of sedimentary basin. Paleo-uplift at the periphery of the sedimentary basin is a key window to explore the basin tectonic-depositional differentiation and the evolution of orogenic belt. Based on the newly acquired 2D and 3D seismic data as well as deep drilling data, the Majiatan paleo-uplift at the middle segment of the western margin of Ordos Basin was discovered and delineated by unconformity analyses and paleo-structure restoration, and its formation mechanism was also explored. It is shown that the Majiatan paleo-uplift, as the syn-depositional uplift above the basement high, occurs at the autochthon of the shallow-level thrust tectonic system detached above the Carboniferous coal measures, with the related unconformities occurring between the Middle Proterozoic Changchengian, the Jixianian, the Lower and Middle Cambrian, the Lower and Middle Ordovician, and the Upper Carboniferous. The Majiatan paleo-uplift suffered three periods of strong uplift and erosion, absent of the Qingbaikouian, Sinian, Upper Cambrian, Upper Ordovician, and Silurian-Lower Carboniferous strata. The hiatuses of the unconformities at Cambrian, Ordovician and Carboniferous bottom are roughly 94.0 Ma, 18.7 Ma and 152.9 Ma respectively. Since the Changchengian period, the Majiatan paleo-uplift underwent three cycles of moderate extension and contraction. The normal faulting and block tilting during the middle of Changchengian period led to the prototype of paleo-uplift on which the Jixianian over-lapped. As a successive paleo-uplift, the Majiatan took shape due to uplift and erosion at the end of Jixianian period, showed alternate subsidence and uplift in Paleozoic and had the stable deposition from the Upper Carboniferous to the Permian. The Majiatan paleo-uplift has a great control upon the development of the Cambrian-Ordovician high-energy facies, dolomite, karst and other reservoirs, where two conceptual hydrocarbon plays may be developed in the Middle Proterozoic and the Lower Paleozoic, indicating a favorable prospect for exploration.

Key words: paleo-uplift, unconformity, formation mechanism, Majiatan area, western margin of Ordos Basin

中图分类号: