Difference Analysis of Organic Matter Enrichment Mechanisms in Upper Ordovician-Lower Silurian Shale from the Yangtze Region of Southern China and Its Geological Significance in Shale Gas Exploration

Figure 6

Excess silicon content, redox environment characteristics, paleoproductivity () and TOC content of the upper Ordovician Xinkailing Formation-lower Silurian no. 1 member of the Lishuwo Formation from the Y-1 well in the lower Yangtze region. The figure is modified from Zhang et al. [14]. See Figure 1 for the well location.