With petroleum resources on the decline, oil and gas companies worldwide including Malaysia are on the lookout for unconventional petroleum accumulations. Part of this effort includes looking at older and deeper petroleum source rock intervals that could have generated hydrocarbons earlier that subsequently accumulated in older and deeper reservoir intervals. In Peninsular Malaysia, two main Tertiary petroleum systems exist (Madon et al., 2006; Tan, 2009). Madon et al. (1999) identified the Groups L and K lacustrine shales (Upper Oligocene-Lower Miocene), and Groups I and H fluvio-deltaic shales and carbonaceous/coaly shales (Lower-Middle Miocene) as the main petroleum source rock intervals for the Malay Basin. Deeper units such as sediments from Group M and pre-Group M (syn-rift) sediments are also believed to contribute to the petroleum system. The 2005 discovery in the south western part of the Malay Basin by the exploration well Anding Utara-1 penetrated a 220 m oil column in metamorphic rocks (Shahar, 2005). This is significant as it indicates the possibility of having hydrocarbon accumulations in older rocks. Such play is commonly referred to as the fractured basement play. It is believed that the Penyu Basin, which lies to the south of the Malay Basin, could potentially have similar plays as the basement there mainly consists of metamorphosed basalts and weathered tuffs (Fanani et al., 2006). However, the hydrocarbons for these fractured reservoirs, which are on basement highs are thought to be sourced from younger sedimentary rocks that are positioned lower/deeper in grabens. This study will evaluate the potential of older (i.e. Mesozoic and Palaeozoic) petroleum source rocks based on geochemical analysis of outcrop samples from Peninsular Malaysia. As the fractured basement play involves reservoir rocks that are of Cretaceous age or older, it is interesting to see if any organic-rich intervals from the Palaeozoic or Lower Mesozoic in Peninsular Malaysia could have contributed to earlier hydrocarbon generation.


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