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Figure 2. A summary diagram showing regional stratigraphy, major tectonic events, essential petroleum system elements, definition of play and play group and their association with stratigraphic positions and space, and discovered reserve and estimated potential oil resources. The uncertainties of the potential in the play groups are indicated by the differences in length of the potential resource bars. All discoveries and potential resources are relative abundances at different stratigraphic levels and in play groups. See Table 1 for actual estimated potential values.