![]() The volume was calibrated with XRD data and sieve analysis. The fractions of the sand, silt and clay can be calculated from openhole logging based on gamma ray, density and neutron logs using the PETRONAS algorithm SSC model to compute the volume of the three fractions (sand, silt, and clay). The proposed approach is to use the ternary diagram to identify and classify the lithofacies based on the clay, silt, and sand volume produced from well logging interpretation including traditional logs and NMR technology. To minimize the uncertainty due to minimum core, the current approach was used to help the geoscientist to identify the lithofacies classification based on ternary diagram. To date the facies and lithofacies identification and classified based on the description of core analysis, which is always limited due to cost of the core samples. Depositional environments in these types of sediments controlling the sand, silt, and clay fraction distribution where the proximal part of the delta characterized by more sand than silt and clay due to high energy, however, the distal part tend to have fines from silt and clay rather than sand fractions. The composition of the sandstone reservoir in Malay Basin sequences is dominated by sand size fraction followed by silt and clay sizes, respectively.
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