Based on the high-density well pattern data and abundant development types of distributary channels in the study area, the control degree of various types of distributary channel sand bodies under different well spacings is analyzed, which has guiding significance for the deployment and adjustment of the development well pattern of delta reservoirs. In this study, the well pattern is divided into regular thinning, and the distribution map of distributary channel sand bodies under different well pattern densities is drawn. The superposition ratio of sand bodies under the current well pattern and the densest well pattern is defined as the sand body control rate parameter. This parameter is used to quantitatively analyze the control degree of each density well pattern on different types of sand bodies. In the process of well pattern infilling, the morphological changes of large-scale stable distribution channel sand bodies are small, while the morphological changes of small-scale unstable distribution channel sand bodies are large. When the well spacing is 330 m and 140 m respectively, the sand body control rate of the composite plate and the assembled zonal distributary channel sand body reaches more than 80%, while the interlaced reticular distributary channel sand body needs 90 m well spacing to achieve this ratio. Bifurcated branched, single narrow strip distributary channel sand bodies also need smaller well spacing. The distributary channel sand body is further subdivided into five types, and the well pattern control degree is analyzed one by one, so that the well pattern deployment is more targeted and adaptable to meet the needs of fine development and potential tapping.