The Architectural Surfaces Characteristics of Sandy Braided River Reservoirs, Case Study in Gudong Oil Field, China

Figure 3

Core photos of Sedimentary structure in Guan6⁴: (a–h) core scan photos; (i–o) core photos. (a) Well 29-J246, 1287.20 m, green muddy siltstone, horizontal bedding. (b) Well 29-J246, 1337.90 m, dust middle-fine-grained sandstone, parallel bedding. (c) Well 29-J254, 1287.1 m, celadon middle-fine-grained sandstone, low-angle oblique bedding. (d) Well 29-J246, 1334 m, dust middle-fine-grained sandstone, high-angle oblique bedding. (e) Well 29-J254, 1286.7 m, celadon fine-grained sandstone, wavy cross-bedding. (f) Well 29-J254, 1286.9 m, celadon fine-grained sandstone, trough cross-bedding. (g) Well 29-J254, celadon middle-fine-grained sandstone, trough cross-bedding. (h) Well 29-J246, 1333.80 m, celadon mud pebble middle grained sandstone, scouring surface. (i) Well 29-J254, mud gravel sandstone, gravel-scouring surface deposition. (j) Well 29-J254, bottom of braided filling channel, calcium cementation, argillaceous siltstone. (k) Well 29-J254, fine-grained deposition with mud stripes. (l) Fine-grained deposition, fall silt seam. (m) Well 26-J286, suspending mud gravel deposition. (n) Scouring eroded channel surface. (o) Well 29-J254, irregular binary structure (thin mud at the top and thick sandstone at the bottom).