石油学报 ›› 2013, Vol. 34 ›› Issue (增刊一): 120-127.DOI: 10.7623/syxb2013S1014

• 地质勘探 • 上一篇    下一篇

鄂尔多斯盆地二叠系“洪水成因型”辫状河三角洲沉积模式

刘锐娥1, 肖红平1, 范立勇2, 张春林1, 郝爱胜1, 缪卫东1   

  1. 1. 中国石油勘探开发研究院廊坊分院 河北廊坊 065007;
    2. 中国石油长庆油田公司勘探开发研究院 陕西西安 710018
  • 收稿日期:2013-03-14 修回日期:2013-07-16 出版日期:2013-09-25 发布日期:2013-09-15
  • 通讯作者: 刘锐娥
  • 作者简介:刘锐娥,女,1963年7月生,1986年获西北大学学士学位,2004年获西北大学博士学位,现为中国石油勘探开发研究院廊坊分院高级工程师,主要从事天然气沉积储层研究。Email:liure69@petrochina.com.cn
  • 基金资助:

    国家重大科技专项"中国大型气田形成条件、富集规律及目标评价(二期)"(2011ZX05007)资助

A depositional mode of flood-induced braided river delta in Permian of Ordos Basin

LIU Rui'e1, XIAO Hongping1, FAN Liyong2, ZHANG Chunlin1, HAO Aisheng1, MIAO Weidong1   

  1. 1. Langfang Branch, PetroChina Research Institute of Exploration and Development, Langfang 065007, China;
    2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2013-03-14 Revised:2013-07-16 Online:2013-09-25 Published:2013-09-15

摘要:

针对鄂尔多斯盆地二叠系山西组1段(山1段)—下石盒子组8段(盒8段)粗相带砂体大面积分布特征,通过古地理背景分析和大量岩心观察,提出山1段—盒8段具有"洪水成因型"辫状河三角洲沉积特征。借助水槽模拟实验对"洪水成因型"辫状河三角洲沉积模式进行验证,实验结果表明宽缓的地貌沉积背景、湖水进退往复、强水动力作用与充足的沉积物供给是砂体大面积分布的主要因素。在较干旱的气候条件下,多期次洪水的接力搬运可使粗粒级砂岩向湖盆腹部长距离延伸,形成横向广覆式分布、纵向叠合连片的大面积辫状河—三角洲砂体。

关键词: 洪水成因, 辫状河三角洲, 接力搬运, 二叠系, 鄂尔多斯盆地

Abstract:

Large areas of sand bodies are distributed in the coarse facies of the first member of Shanxi Formation (Member Shan1) and eighth member of Lower Shihezi Formation (Member He 8) in the Permian in Ordos Basin. A deposition mode of flood-induced braided river delta from Member Shan1 to Member He 8 is proposed based on paleo-geographic analysis and extensive core observations. The proposed depositional mode is verified via a tank simulation experiment. Results show that broad flat landform, lake-level fluctuations, strong hydrodynamic force, and sufficient sediment supply are the main factors responsible for the large-area distribution of the sand bodies. Under arid climatic conditions, successive transportation by multi-stage flood enables the long-distance expansion of coarse sandstone toward the belly of the lake basin, resulting in the formation of large-area braided river-delta sand bodies characterized by wide distribution and vertical overlap.

Key words: flood cause, braided river delta, successive transportation, Permian, Ordos Basin

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