摘要
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal>Trace elements of oil-bearing fluid inclusion in sixteen Silurian oil-containing sandstones from ten wells in Tazhong area were performed by inductively coupled plasma mass spectroscopy (ICP-MS), the distribution characteristics were analyzed and their demonstrative geological significance were furthermore discussed. The results show that for the same sample, each trace element abundance is small to one order of magnitude, and large to hundreds orders of magnitude, but for the different samples, the difference times of the same element abundance is ordinarily lower than one order of magnitude, some element(Ni and Ti)may reach up to one order of magnitude or more. In the same well field, the abundance distribution of part trace elements of samples from different wells present preferable regularity. As a whole, the distribution rule of main trace elements is that the abundance is increasing from down-structure location to structural high. Of all the samples, the ratios of V/Ni is generally low, range from 0.044 to 0.683, most of samples are less than 0.5, lower V/Ni ratio and high Fe content represent a strong reductive depositional environment.