These reservoirs deposited at the fluvial-deltaic system ( Figure 2). The main reservoir targets have occurred at D and E formations. The application of the SQp and SQs attributes successfully interpreted facies and fluids distributions in the Northern Malay Basin. Gassmann’s fluid substitution modeling is also generated in the well logs and AVO synthetics for in situ, pure brine, and pure gas cases. This analysis includes AVO gradient analysis and AVO cross plot to identify the fluid class. The volume of shale, volume of coal, porosity, and water saturation logs are used to identify facies and fluid in well log scale. Well log data, e.g., density and sonic logs, are used to generate synthetic seismogram and well tie requirements. They are interpreted by using angle-stack seismic data based on amplitude contrast on interfaces. SQp and SQs AVO attributes are integrated with well log data and considered as the best technique to determine facies and fluid distribution. By comparing with the Scaled Poisson’s Ratio attribute, SQp and SQs attributes are more accurate in determining facies and hydrocarbon. These new attributes have also been compared to the common method, which is the Scaled Poisson’s Ratio attribute. SQp and SQs are the new AVO attributes, which derived from AVO analysis and created according to the intercept product (A) and gradient (B). These methods are supposed to be more sensitive to predict the hydrocarbons and give less ambiguity. This research is aimed to demonstrate an application of the scale of quality factor of P-wave (SQp) and the scale of quality factor of S-wave (SQs) AVO attributes for facies and fluid types separation in field scale. This study is focused on a field of Northern Malay basin, which is associated with a fluvial-deltaic environment, where this system has high heterogeneity, whether it is vertically or horizontally. Generating AVO attributes are one solution to give an accurate result in facies and fluid characterization. Amplitude versus offset (AVO) analysis integration to well log analysis is considered one of the advanced techniques to improve the understanding of facies and fluid analysis.
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