Void gas molecular composition (C1-C5 hydrocarbon, CO2, and air) from the Terrebonne Basin, Walker Ridge Block 313, Site H, Expedition UT-GOM2-2

This dataset contains gas composition data from void gas samples (sample code VG). Void gases were extracted using a stainless-steel puncture sampler that was pushed through the core liner shortly after the core was collected onboard the Helix Q4000. Samples were analyzed onboard the Helix Q4000 using an Inficon Fusion MicroGC chromatograph with molecular sieve, PLOT Q columns, and thermal conductivity detector. Carbon dioxide, methane, ethane, propane, butane, isobutane, and pentane were measured. See Expedition UT-GOM2-2 Methods: Gas Geochemistry (Flemings et al., 2025a, https://doi.org/10.5281/zenodo.13971228). The attached readme file, previewed below, describes the data file in this dataset and its contents. The readme file also contains links to where the data is presented in the expedition proceedings. Additional data you might expect to find in this dataset can instead be found at the following locations: The sample depths can be found in the curation dataset (http://doi.org/10.5281/zenodo.14926309). Download the file UT-GOM2-2 CORE LOG depths – sortable.xlsx, see tab “Sample-measurement log” sample code “VG”. Gas composition of additional void samples, pressure cores, and dissociated gas hydrate can be found in the gas geochemistry dataset (https://doi.org/10.5281/zenodo.15626975). Gas composition of headspace gas samples can be found in the gas geochemistry dataset (https://doi.org/10.5281/zenodo.14518633).本数据集包含孔隙气体（void gas）样品（样品代码VG）的气体组分数据。孔隙气体的提取方式为：在“Helix Q4000”号科考船上完成岩芯采集后不久，使用不锈钢穿刺采样器穿透岩芯衬套进行提取。所有样品均在“Helix Q4000”号科考船上，采用搭载分子筛、PLOT Q色谱柱及热导检测器的Inficon Fusion MicroGC气相色谱仪完成分析，检测组分涵盖二氧化碳、甲烷、乙烷、丙烷、丁烷、异丁烷及戊烷。详细实验方法参见UT-GOM2-2航次方法：气体地球化学（Flemings等，2025a，https://doi.org/10.5281/zenodo.13971228）。 本数据集附带的自述文件（预览内容如下）对数据集内的数据文件及其内容进行了说明，该自述文件还提供了数据在航次会议论文集中的展示位置链接。 本数据集未收录的其他预期可用数据可通过以下途径获取： 1. 样品深度信息可在整理数据集（http://doi.org/10.5281/zenodo.14926309）中获取：下载文件UT-GOM2-2 CORE LOG depths – sortable.xlsx，查看“Sample-measurement log”工作表中样品代码为“VG”的条目。 2. 其他孔隙气体样品、压力岩芯样品及解离天然气水合物的气体组分数据，可在气体地球化学数据集（https://doi.org/10.5281/zenodo.15626975）中获取。 3. 顶空气体样品的气体组分数据可在气体地球化学数据集（https://doi.org/10.5281/zenodo.14518633）中获取。