The Balingian Province of northwest Borneo contains a wide range of hydrocarbon-bearing reservoirs, with production dominantly from Early Miocene coastal to lower coastal plain sand bodies. Previous studies have interpreted these deposits as being part of a fluvial-dominated coastal system (Almond et al., 1990). However, this study highlights the widespread occurrence of tidal indicators in the Balingian Province, suggesting a more strongly tide-influenced coastal regime. The occurrence of marine-influenced<br>organic-rich sediments, in particular mangrove-derived coal deposits (Wan Hasiah, 2003), also supports the tide-influenced coastal regime for the Balingian Province.


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