East China Sea Shelf Shallow-Gas Dataset

The contents are: (1) a regional acoustic gas-top depth point dataset (37,728 picks) delineating shallow-gas distribution across the shelf; (2) three 0.1°-resolution grids of Holocene sediment thickness — full Holocene (0–10 ka), last 2 ka, and 7.7–2 ka — used to evaluate sediment-accumulation control; (3) laser grain-size data for seven boreholes (YS1–YS7); (4) headspace gas concentrations (CH₄, CO₂) and stable carbon/hydrogen isotopic compositions (δ¹³C-CH₄, δD-CH₄, δ¹³C-CO₂) for gas-source discrimination via the Whiticar diagram; (5) major and trace element geochemistry of borehole YS6 together with redox proxies; (6) soil-mechanics indices for five gas-bearing boreholes; and (7) the raw piezocone (CPTU) profile from the single in-situ sounding near borehole YS6 that independently records the free-gas interval (8.7–9.6 m).

Column headers embed their units (e.g., gas_top_depth_m, CH4_uL_L). The dataset supports investigation of sediment-environment (non-diffusive) controls on shallow-gas occurrence and bears directly on global marine methane-flux accounting, which currently rests on a diffusion-based paradigm. Data are licensed CC-BY 4.0; contact: duan-xy@qq.com.