(Table 1) Organic geochemistry of ODP Site 128-799A@en

Pyrolysis techniques were used to characterize the organic matter contained within the penetrated section and to assess the presence of heavy hydrocarbon shows. The Rock-Eval data indicate a change in organic hydrogen enrichment within the middle Miocene sequence. It appears that the level of organic enrichment may be controlled by sedimentation rate, while the organic hydrogen enrichment, as shown in the hydrogen index, may reflect differences in preservation potential. Higher sedimentation rates would result in higher organic carbon contents. Higher hydrogen index values would reflect higher degrees of organic preservation resulting from more restricted circulation. […]本研究采用热解技术对钻井揭露剖面中的有机质开展表征工作，并对重烃显示的赋存状态进行评估。岩石热解仪（Rock-Eval）数据表明，中中新统地层序列内的有机氢富集程度存在变化。研究显示，有机富集程度或受控于沉积速率；而如氢指数所体现的有机氢富集程度，则可反映有机质保存潜力的差异。较高的沉积速率将带来更高的有机碳含量；较高的氢指数值则反映了因流体循环更受限制所导致的有机质保存程度更高。[…]