岩性油气藏 ›› 2023, Vol. 35 ›› Issue (1): 63–73.doi: 10.12108/yxyqc.20230106

• 地质勘探 • 上一篇    下一篇

鄂尔多斯盆地东部二叠系下石盒子组8段河流相砂体构型要素

马东烨1,2,3, 陈宇航1,2,3, 赵靖舟1,3, 吴伟涛1,3, 宋平4, 陈梦娜4   

  1. 1. 西安石油大学 地球科学与工程学院, 西安 710065;
    2. 油气资源与探测国家重点实验室, 中国石油大学(北京)北京 102249;
    3. 陕西省油气成藏地质学重点实验室, 西安 710065;
    4. 中国石油新疆油田分公司, 新疆 克拉玛依 834000
  • 收稿日期:2022-01-05 修回日期:2022-07-15 出版日期:2023-01-01 发布日期:2023-01-06
  • 第一作者:马东烨(1997-),男,西安石油大学在读硕士研究生,研究方向为沉积储层研究。地址:(710065)陕西省西安市西安石油大学。Email:mdy19971018@163.com
  • 通信作者: 陈宇航(1988-),男,博士,副教授,主要从事沉积储层、油气地质综合研究方面的教学与科研工作。Email:cyh@xsyu.edu.cn。
  • 基金资助:
    油气资源与探测国家重点实验室开放课题“基于测井数据的砂体构型定量预测及含油气性研究”(编号: PRP/open-2106)、西安石油大学研究生创新与实践能力计划资助项目“鄂尔多斯盆地东北部上古生界河流相砂体构型预测及含油气性研究”(编号: YCS21212099)和中海石油(中国)有限公司天津分公司研究院外协项目“渤东低凸起周边古近系中深层沉积体系研究与优质储层预测”(编号: CCL2021TJT0NST0529)

Architectural elements of fluvial sand bodies of the eighth member of Permian Xiashihezi Formation in eastern Ordos Basin

MA Dongye1,2,3, CHEN Yuhang1,2,3, ZHAO Jingzhou1,3, WU Weitao1,3, SONG Ping4, CHEN Mengna4   

  1. 1. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;
    3. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an 710065, China;
    4. PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2022-01-05 Revised:2022-07-15 Online:2023-01-01 Published:2023-01-06

摘要: 通过对鄂尔多斯盆地东部二叠系下石盒子组 8 段河流相沉积露头的岩相特征进行描述,明确了其砂体构型要素类型、空间展布及组合模式。研究结果表明: ①研究区发育辫状河和曲流河沉积,识别出块状层理砂砾岩相 (Gm),槽状交错层理含砾砂岩相 (Gst),槽状交错层理砂岩相 (St),板状交错层理砂岩相 (Sp),平行层理砂岩相 (Sh),上攀波纹层理砂岩相 (Sc),水平层理粉砂岩相 (Fh) 和块状层理泥岩相 (M) 等8 种岩相。②研究区发育河道、心滩、废弃河道、边滩和漫溢沉积 5 种构型要素,垂向沉积序列差异明显,河道为Gm-Gst-St-M-St,心滩为Gm-Gst-St-Sp,边滩为St-Sp-Sc-Sh-M或St-Sp-Sc-M,废弃河道为Gm-St-Sp-M且与河道相似,但粒度更小、泥质含量更高,漫溢沉积为 Sp-Fh-M。③研究区构型要素组合有河道-漫溢沉积、河道-废弃河道、河道-心滩 (垂向、侧向) 叠加、多期河道砂体 (垂向、侧向) 叠加、心滩-漫溢沉积、多期心滩砂体 (垂向、侧向) 叠加、多期边滩砂体侧向叠加、边滩-废弃河道、边滩-漫溢沉积等 9 种类型。④研究区砂体构型要素类型、组合样式及其分布都受物源距离和水动力条件的影响,距离物源越近,水动力条件越好,砂体规模越大,连通性越好;近物源区辫状河底部砂体发育优于顶部,心滩砂体储集性能最佳;远物源区曲流河底部边滩砂体横向上多期叠置,连通性较好,发育较好。

关键词: 心滩, 边滩, 辫状河, 曲流河, 砂体构型要素, 下石盒子组8段, 二叠系, 鄂尔多斯盆地

Abstract: Based on the description of lithofacies characteristics of fluvial outcrops,the architectural element types,distribution and stacking patterns of fluvial sand bodies of the eighth member of Permian Xiashihezi Formation in eastern Ordos Basin were studied. The results show that: (1) Braided river and meandering river are developed the eighth member of Permian Xiashihezi Formation in eastern Ordos Basin. Eight types of lithofacies were identified,including massive bedding conglomerate (Gm),trough cross bedding gravelly sandstone (Gst), trough cross bedding sandstone (St),tabular cross bedding sandstone (Sp),parallel bedding sandstone (Sh), climbing ripple bedding sandstone (Sc),parallel bedding siltstone (Fh) and massive bedding mudstone (M). (2) Five architectural elements are developed in the study area,including channels (CH),channel bars (CB), abandoned channels (ACH),point bars (PB) and overflow (OF) deposits,and the vertical sedimentary sequences of these architectural elements are obvious differences. CH: Gm-Gst-St-M-St,CB: Gm-Gst-St-Sp,PB: St-Sp-ScSh-M or St-Sp-Sc-M,ACH: Gm-St-Sp-M,OF: Sp-Fh-M. The vertical sedimentary sequences of ACH are similar to that of CH,but featured with smaller grain size and higher mud content. (3) Nine basic combination types of architectural elements are developed in the study area,namely CH-OF,CH-ACH,CH-CB (vertically and laterally), CH-CH (vertically and laterally),CB-OF,CB-CB (vertically and laterally),PB-PB (laterally),PB-ACH and PB-OF. (4) The types,stacking pattern and distribution of architectural elements of fluvial sand bodies in the study area are affected by the distance of source and hydrodynamic force. The closer to the source,the better the hydrodynamic force,the larger the sand body scale,and the better the connectivity between the sand bodies. In the braided river near the source,the development of sand bodies at the bottom is better than that at the top,and the reservoir capability of point bars is the best. Multi-stage point bars at the bottom of meandering river in the far-source area are well developed and stack laterally with good connectivity.

Key words: channel bar, point bar, braided river, meandering river, sand body architectural element, the eighth member of Xiashihezi Formation, Permian, Ordos Basin

中图分类号: 

  • TE122.2
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