| Citation: | Tao Zhenpeng, Zhang Bing, Mi Honggang, Du Jia, Qin Chenyang, Jiao Yangquan, Wu Liqun, Yue Liang, 2026. Sedimentary Evolution Characteristics of Large-Scale Composite Tidal Channel Sandbody in the Lower Member of Taiyuan Formation in Linxing Middle Block, Ordos Basin and Their Coupling Relationship with Gas-Bearing Properties. Earth Science, 51(9): 3599-3618. doi: 10.3799/dqkx.2026.851 |
The Taiyuan Formation in the Linxing Middle Zone, eastern margin of the Ordos Basin, serves as the key layer for the collaborative exploration and development of tight sandstone gas and coalbed methane (CBM). To clarify the enrichment patterns of coal measure gas in this region, this study finely characterizes the sedimentary evolution characteristics of large tidal sand bodies in the lower section of the Taiyuan Formation, clarifying the spatial stacking relationship of tidal sand bodies and their relationship with gas-bearing genesis, on the basis of the division of sequence stratigraphy, and in combination with seismic, logging, core, and outcrop data. It is suggested that the lower section of the Taiyuan Formation is a tidal flat sedimentary system, and tidal channels and sand flats are the main reservoir types of the Taiyuan Formation gas reservoir in this area. The large tidal sand bodies are distributed in a tongue-shaped pattern with thickness greater in the north and less in the south, and in an east-west lens shape in the northern part of the study area, showing a vertical evolution law from foundation development to peak development to decline and disappearance, which has a strong scouring effect on the underlying 8+9# coal seam. The stacking types of tidal sand bodies mainly include multi-stage stacking, vertical stacking, lateral stacking, and isolated types. Among them, multi-stage and vertical stacking sand bodies have excellent connectivity, greater thickness, and better gas content, making them potential high-quality reservoirs in the area. Comprehensive analysis suggests that the primary controlling factor for the distribution of gas-bearing units is sedimentary microfacies, followed by sand body stacking styles (multi-stage and vertical stacking styles are most favorable), while the physical conditions inside tidal channels are the essential factors resulting in differences in gas-bearing properties. The research results can provide a theoretical basis and technical support for the collaborative and efficient exploration and development of deep coalbed methane and tight sandstone gas in the Linxing Middle Block.
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