Natural Gas Migration Pathways and Their Influence on Gas Hydrate Enrichment in the Qiongdongnan Basin, South China Sea

Table 1

Lithologic data for sequences of line 1 in the study area [50].

Reflecting interface	Sedimentary facies	Mudstone content	Sandstone content
TSB-T20	Bathyal-deep-sea deposits	99.35%	0.65%
T30-T20	Bathyal-deep-sea deposits	74.19%	25.81%
T40-T30	Bathyal-deep-sea deposits	81.85%	18.15%
T50-T40	Bathyal-deep-sea deposits	74.2%	25.8%
T60-T50	Bathyal-deep-sea deposits	94%	6%
T70-T60	Neritic deposits	96%	4%
Tg-T70	Nearshore subaqueous fan	54.3%	47.7%