Petrological Characteristics and Rock Nomenclature of Sedimentary Bauxite Gas Reservoir: A Case Study of Bauxite in Taiyuan Formation of Ordos Basin

Figure 5

Thin sections and electron microscopic photographs of bauxite in Taiyuan formation: (a) S406, 4312.79 m, particle texture, poor particle sorting, and good roundness; (b) L47, 4100.00 m, particle texture; some particles suspended contact; (c) M119, 3049.64 m, particle texture and flattening and elongating along the plane; (d) L47, 4104.00 m, bean-oolitic texture and circle-layer development; (e) M11, 3048.30 m, laminar texture, grain structure, and residual gel structure; (f) M119, 3047.91 m, grain structure; dissolution pores and intergranular dissolution pores are developed; (g) T26, 3659.38 m, gel texture and characteristics of continuous wave extinction; (h) H9, 2579.15 m, micrite texture; generally, the microplate columnar shape is less than 2 μm; (i) L58, 4048.01 m, bean-oolitic microcrystalline bauxite with alga bonding texture.