## 1 Introduction  
The Sulige gas field is the largest integral gas field discovered onshore in China [1]. In recent years, as the development of the Sulige gas field has gradually advanced to the edge of the basin, an increasing number of exploration and development problems have gradually emerged. The northern part of the eastern area of the Sulige gas field is representative (Figure 1). The upper Paleozoic erathem in this area has been drilled and experienced continuous industrial gas flows in recent years, indicating good exploration potential, but at the same time, there are many problems such as thin gas layers [2], low gas saturation, complex gas-water relationships, unclear enrichment patterns, and low deployment success rates. Sandstone bodies are widely developed in the area, and the main sandstone bodies of the He 8 and Shan 1 members are distributed in a north-southband (Figure 2). However, high-yield wells are concentrated in the central and western parts of the study area (i.e., Areas 4 and 5 in Figure 2), which is distributed in an east-west direction. The distribution trend of gas reservoirs and the distribution direction of sandstone bodies nearly intersect vertically, indicating that the enrichment of natural gas is not completely controlled by the distribution of sandstone bodies but that there are other controlling factors. Figure 1: Location map of the tectonic units and the Sulige gas field in the Ordos Basin. The Sulige gas field is considered a typical lithological tight gas reservoir [3]; the gas-water distribution is essentially not controlled by regional tectonics, and natural gas is enriched in relatively high-porosity and high-permeability reservoirs (sweet spots) [4]. However, studies in recent years have shown that tectonic movement still has a certain control on the enrichment of tight gas in the upper Paleozoic erathem in the basin [5; 6; 7; 8; 9; 10]. For example, through well-seismic fine characterization, [PERSON] et al. [5] revealed that the western Sulige gas field is not simply a lithological gas reservoir but rather a multiple-type gas reservoir under the joint control of fault + structure + lithology + physical properties. [PERSON] [9] reported that Upper Paleozoic gas reservoirs are distributed mainly on ridges in sags and uplift assemblages. [PERSON] et al. [8] studied the tectonic evolution of the eastern Ordos Basin and reported that the paleo-uplift area is considered an important \"sweet spot\" area for the formation of upper Paleozoic tight gas reservoirs in the eastern basin. The discovered Yulin gas field and Daniudi gas field are located in and near the paleo-uplift. At present, previous studies on upper Paleozoic tight gas in the northeastern Sulige gas field area have focused on reservoir characteristics, the distribution characteristics of gas-water layers and fracture characteristics [2; 11; 12; 13]. In terms of describing the static characteristics of reservoirs, studies on the relationship between tectonic movement and natural gas enrichment are very rare. In other blocks of the Sulige gas field, due to abundant gas sources, if attention is only paid to areas with good physical properties for drilling, great achievements can be obtained, and the influence of tectonic factors on the distribution of gas reservoirs appears to be rather weak. However, in the research area on the edge of the Sulige gas field where the gas source is not so abundant, tectonic factors will play a certain role at this time, and natural gas will accumulate towards the structurally high areas. Therefore, for the exploration of the edge areas of oil and gas fields, the guiding role of tectonic factors cannot be ignored.