The researchers studied the lithology in a gas reservoir in Altun forelands to understand how it affects gas production. They found that the main lithologies are epimetamorphic limestone, slate, and calcareous slate. Traditional methods for identifying lithology didn't work well, so they used core samples and well logging data to predict lithology distribution. They discovered that the upper part is mostly limestone, the lower part is slate, and calcareous slate is found in some areas. Limestone is the most productive lithology, while gas in slate is mainly found near faults. This study helps us understand how different rock types impact gas reservoirs in Altun forelands.