Abstract：In-situ stress is one of the main controlling factors affecting formation compaction. Changes in this stress inevitably lead to changes in compaction, which further affect interval velocity and tectonic interpretation based on seismic data. How-ever, no relevant literature has been found that quan-titatively analyzes the influence of lateral changes in in-situ stress on interval velocity and tectonic in-terpretation. For this reason, drawing on logging data and research results in civil engineering, solid minerals, drilling engineering, and other fields, this study simulated the stress field by the finite difference method and analyzed the influence me-chanism of local in-situ stress on interval velocity. The following understandings were gained from the analysis: ① Velocity variation on a local scale is mainly affected by the variation of the local stress field, and it has a great influence on the reserve evaluation of oil and gas fields at the initial stage of exploration. ② As for the drape anticline, the vertical in-situ stress decreases in the direction from the structural high to the wing, and the change quickens with the increase in burial depth. ③ Regarding the rollover anticline, the vertical in-situ stress increases in the direction to the fault, and the change speeds up as the fault draws near and burial depth increases. ④ Under the influence of in-situ stress, interval velocity and average velocity at the structural high are higher than those at the wing in these two types of structures, and the changes quicken with the increase in burial depth. Examples of drilled oil fields confirmed the above understandings. Therefore, the insitu stress field is one of the important geological factors affecting the variation of interval velocity, and it should be taken into account in seismic exploration.
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