Enhancing geological interpretation with seismic attributes, Gulf of Thailand

Abstract

This work has generated the seismic attributes from horizontal time slice at 0.4 second from the Kra Basin of the western graben domain in the Gulf of Thailand. The seismic attributes can be separated into two major groups based on their response form the study area. The first group is good at lithology contrast detection providing, channel boundaries, channel belts, point bars, meander scars, and oxbow lakes. The, attributes in this group include envelope, RMS amplitude, sweetness, chaos, and spectral decomposition. The second group is good at geological structure detection providing, faults, fractures, folds, and bedded slope. This group comprises structural dip, variance, and ant-tracking attribute. Multi seismic attributes analysis using ant tracking with variance and chaos attribute can extract us more useful information to interpret geomorphology and delineating faults, especially chaos attribute with aggressive-aggressive parameter of ant-tracking attribute. Geomorphology interpretation suggests that the main features of this study area are channels that their sizes are varied. The major channels (width: approximately 0.5-1.3 km) are less sinuosity than minor channels (width: approximately 0.1-0.35 km), most of their direction is northeast-southwest, side-attached point bars are dominant features either displayed as high amplitude spots, and some of them show lateral accretions, meander scars and oxbow lake are in this area too, so we can suggest that paleo-environment should be the fluvio-delta environment. Moreover, the result maps from this study show higher resolution such as high-amplitude anomalies or bright spots, probably due to gas accumulation in shallow depth that cannot be observed from previous work