The Walloon Coal Measures in the Surat Basin are the main target for Coal Seam Gas (CSG) production in Queensland. They are overlain by the Springbok Sandstone, although consistently identifying the boundary between these two extremely heterogeneous intervals is challenging, and different stratigraphic methods may lead to quite different interpretations. This paper discusses the challenges associated with identifying the Walloon-Springbok boundary and highlights some potential impacts of using alternate interpretations of the boundary. Ulimately, resolving this challenging geology is important because different correlations impact the vertical and horizontal propagation of pressure in groundwater and reservoir models.

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