A series of seismic exploration technologies, such as the “wide line + big combination” mountainous seismic acquisition, highly steep structure pre-stack depth migration processing, and deep tectonic modeling, were used to explore Kuqa deep structures. Pre-salt deep structures were preliminarily confirmed and a group of large structural traps were found. The research shows that deep strata of the Kuqa foreland thrust belt are favorable for forming giant gas accumulations. Large-scale imbricated thrust structures prepare traps for large-scale oil and gas accumulation. Excellent hydrocarbon source conditions and later intense charge of gas provide sufficient hydrocarbon sources. Deep mass effective reservoir sandstone works as good reservoir space for giant gas accumulation. Thick gypsum serves as good cap. The geological characteristics of giant gas accumulations in deep pre-salt structures are as follows: Hydrocarbon distribution is controlled by structural traps and structural gas reservoirs are dominant. Reservoir properties of deep thrust belt are generally poor, with fractures being the important controlling factor for hydrocarbon enrichment. Oil and gas distribution is characterized by joint control of source and cap, stacking of multi-layer beds, and overall beds containing gas. Reserves are large, and single well productivity is high.