Migration of C1 to C8 volatile organic compounds in sediments at DSDP Hole 75-530A

The distribution of C1 to C8 hydrocarbons in sediment samples from DSDP Leg 75, Hole 530A, indicates that significant amounts of methane and ethane have migrated from organic-rich to organic-lean shales in close proximity. Most compounds larger than ethane are not migrating out of black shales, where they occur in high concentrations. These results lead to a general model for assessing migration. In addition, three shale types are identified on the basis of organic carbon and pyrolysis products and patterns.

深海钻探计划（Deep Sea Drilling Project, DSDP）第75航次530A钻孔的沉积物样品中C1至C8烃类的分布特征显示，大量甲烷与乙烷已从富有机质页岩向邻近的贫有机质页岩发生运移。绝大多数分子量大于乙烷的烃类化合物并未从黑色页岩中运移出来，此类化合物在黑色页岩中呈高浓度赋存。上述研究结果构建了一套用于评价烃类运移的通用模型。此外，本研究基于有机碳含量、热解产物及其分布模式，识别出三种页岩类型。