ODP184航次岩芯海底沉积物元素相态研究及其对有机质和轻烃的指示意义

分析了ODP184航次1 146站位海底岩芯沉积物中的Cu、Fe、Ni等7种元素的总量和相态分布及变化规律;研究发现,各元素的总量及相态的剖面分布受生物作用、有机质络合吸附、共沉淀等多种因素控制;沉积物主要来自陆源.元素Cu、Co、Ni的有机结合态及总量的分布规律表明深部地层中存在大量有机物;结合岩芯沉积物中有机气体及相关地质背景,认为该区具有良好的油气赋存条件;对各元素的相态与轻烃及各有机指标进行聚类分析,发现虽然可交换态的Cu、Fe、Ni在元素各相态中所占的比例较少,但却是指示油气存在的有效指标.

ELEMENT PHASES OF DRILLING CORE SEDIMENT FROM ODP 184 VOYAGE AND THEIR SIGNIFICANCE FOR OIL GAS INDICATION

The analysis of seven elements such as Cu, Fe and Ni, etc, and their phases in drilling core sediment of site 1146 of ODP184 enabled the authors to determine the distribution and vertical change rules of total content and phases of various elements. The study shows that the distribution of total content and phases of various elements on the section were controlled by the many factors such as biological action, complexation and adsorption of organic matter, and coprecipitation, etc, and that sediment mainly came from mainland. While the distribution rules of organic phase and total content of element Cu,Co,Ni show that a large amount of organic matter existed in the deep stratum. In combination with organic gas in the core sediment and correlative geology condition, it was concluded that there is a good condition for the existence of oil gas in the area. The cluster analysis between various element phases and light hydrocarbons and organic indexes show that the exchangeable phase of Cu, Fe and Ni could indicate the oil gas indirectly although their proportions are few in various phases.