The Distribution Characteristics and Geological Significance of Inclusion Trace Elements in Silurian Oil-containing Sandstones in the Central Tarim Basin

摘要

Trace elements of fluid inclusion in 16 Silurian oil-containing sandstones from 10 wells in Tazhong area were performed by inductively coupled plasma mass spectroscopy (ICP-MS), the distribution characteristics were analyzed, and their demonstrative geological significance was deeply discussed. The results show that the abundance of trace element varied markedly in the same well field or different well fields, the distribution rule of the main trace elements is that the abundance is increasing as a whole from down structure location to structural high. Variation characteristics of single trace element are consistent with the trace element suite, which reflects Silurian hydrocarbons in Tazhong area migrated toward structural high or stratigraphic pinch-out direction, from northwest to southeast on the plane. Therefore, trace elements of fluid inclusion can provide effective evidence for studying oil and gas migratory direction.