SQ1 is finning upward, primarily consisting of mudstone, carbonaceous mudstone and coal seams which are acting as cap or source rock in the transgressive and highstand systems tract (Figs. 4 and 5). It manifests cylindrical and bell-shaped (aggrading and retrograding), serrated (aggrading), and funnel trend (prograding) in the GR curve, corresponding to the lowstand, transgressive and highstand systems tracts, respectively.