Abstract: The central diapir zone is the key gas-producing area in Yinggehai basin. Material compositions and activities of the diapir directly control the natural gas accumulation course and features. For probing the course and features, this paper demonstrates the main intrusion pattern, emphasizes and summarizes the diapiric hydro-dynamic balance system and analyzes the gas reservoir characteristics under the control of dynamic balance of fluids. According to material compositions and intrusion pattern, diapirs in the study area can be classified into 4 types such as slow wedging, continuous penetrating, periodic collapsing and mixed breakthrough. The former 3 types belong to stepping diffusion system dominated by mud diapir, penetrating fragment system induced by fluid front and periodic collapsing dynamic balance system dominated by fluid column, respectively. In a dynamic balance system, gas reservoirs are charged with multi-stage mixed gas and overlapped with each other in different charging degrees. The structure of syntectonic stratum is complex and several petroleum systems can coexist. Petrochemical components of natural gas exhibit delamination and inversion of carbon isotope value could be found. It is necessary to distinguish intrusion pattern of diapirs during gas reservoir exploration. Integrated analysis should be conducted regarding target trap type, relationship between sand body and diaper and the neighboring gas reservoirs to identify gas-bearing properties of the traps