Focused Fluid Flow, Shallow Gas Hydrate, and Cold Seep in the Qiongdongnan Basin, Northwestern South China Sea

Figure 8

(a) Seismic section of the deep gas chimneys, BSRs, and newly discovered cold seeps in the study area and (b) schematic diagram of the gas generation, migration, and accumulation in the study area. The yellow dashed lines in panel (a) indicate the BSRs, the orange dashed lines delineate the gas chimneys, and the olive green lines indicate the faults. The orange area in panel (b) represents Eocene-Oligocene source rocks, and the yellow cones represent gas chimneys; the light green area represents the gas migration zone. The BGHSZ is indicated by BSRs, and the top area is the seismic anomaly area, which is also characterized by focused fluid flows and shallow gas hydrates. PR: polarity reverse; PD: pulldown; MF: minor fault; GC: gas chimney.

(a)

(b)