地学前缘 ›› 2013, Vol. 20 ›› Issue (2): 1-9.

• 论文 •    下一篇

鄂尔多斯盆地西南缘上三叠统延长组层序地层学与砂体成因研究

刘自亮，朱筱敏*，廖纪佳，陈杰   

  1. 1. 成都理工大学 能源学院, 四川 成都 610059
    2. 中国石油大学(北京) 地球科学学院, 北京 102249
    3. 中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 102249
    4. 西南石油大学, 四川 成都 610500
    5. 中国石油 长庆油田分公司, 陕西 西安 710018
  • 收稿日期:2012-12-20 修回日期:2013-01-22 出版日期:2013-03-15 发布日期:2013-03-15
  • 作者简介:刘自亮(1978—)，男，博士，讲师，从事沉积学研究。E-mail:bugliu2001@163.com
  • 基金资助:

    国家重点基础研究发展计划“973”项目“中国西部叠合盆地深部油气复合成藏机制与富集规律”(2011CB201104)；国家重大专项“岩性地层油气藏沉积体系、储层形成机理与分布研究”(2011ZX05001002)；国家重大专项“大型油气田及煤层气开发”鄂尔多斯盆地大型岩性地层油气藏勘探开发示范工程(2008ZX05044 132) 和“大型油气田及煤层气开发”项目专题(2011ZX05009002)

Sequence stratigraphy and genesis of sand bodies of the Upper Triassic Yanchang Formation in the southwestern margin of Ordos Basin.

 LIU  Zi-Liang, SHU  Xiao-Min-*, LIAO  Ji-Jia, CHEN  Jie   

  1. 1. College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China
    2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
    3. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China
    4. Southwest University of Petroleum, Chengdu 610500, China
    5. PetroChina Changqing Oilfield Company, Xi’an 710018, China
  • Received:2012-12-20 Revised:2013-01-22 Online:2013-03-15 Published:2013-03-15

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摘要：

以鄂尔多斯盆地西南缘延长组为例，运用高分辨率层序地层学原理，对延河等露头沉积特征进行深入研究。研究认为不整合面、冲刷侵蚀面、岩性岩相转换面和湖泛面为重要的层序界面，并划分出1个超长期基准面旋回，5个长期基准面旋回及17个中期基准面旋回。延长期东、西两岸发育河流三角洲沉积体系，东北部主要为曲流河、曲流河三角洲体系；西南主要发育辫状河及辫状河三角洲沉积体系。有利储集砂体主要为水下分流河道成因、水下分流河道河口坝复合成因、河口坝成因和滑塌浊积扇成因等4种类型。研究认为，随湖平面变化，在基准面升降过程中，可容纳空间(A)与沉积物补给量(S)的比值(A/S)影响不同物源方向沉积体系的分布，并建立了沉积演化分布模式。

关键词: 鄂尔多斯盆地, 延长组, 三叠统, 层序地层, 砂体成因

Abstract:

Taking the Yanchang Formation in the southwestern margin of Ordos Basin as an example, by using the high resolution sequence stratigraphy theory, this paper studied the sedimentary characteristics of the Yanhe and other outcrops. It is concluded that unconformities, erosion surfaces, lithofacies contrast surfaces and flood surfaces mark the important sequence boundaries. The Yanchang Formation in the study area can be divided into one super longterm baselevel cycle, five longterm baselevel cycle and seventeen midterm baselevel cycles. It mainly developed braided fluvial and braided delta depositional system in the southwest steep slope, meandering river delta sedimentary system in northeast terrainrelief and turbidite fan deposits in the deep lake systems. The genesis of favorable sandstone reservoirs can be divided into submarine distributary channel, submarine distributary channel and composite river mouth bar, river mouth and slump turbidite fans. With changing lake level, the ratio of accommodation space (A) over sediment supply (S) affects the distribution of depositional systems from different source directions and the sedimentary evolution distribution patterns, as discussed in the paper.

Key words:  Ordos Basin, Yanchang Formation, Triassic, sequence stratigraphy, genesis of sand bodies

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