Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (1): 63-73.doi: 10.12108/yxyqc.20230106

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

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

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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

CLC Number: 

  • TE122.2
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