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根据钻井判定的工业油气层与过井地震道制作合成记录，在地震剖面上标定。再利用地震速度谱和层速度递推公式，分别拾取和计算与油气地质体同一时域的速度值。采用美国学者莱德尔提出的差异速度叠合法，将地质体顶、底的速度值叠合，低速异常发育带可能是气层。经地震测网的追踪闭合在平面上进行圈定。将此法，用于新场气田试研究，发现1600～2200m以浅的上侏罗统蓬莱镇组气藏，沙溪庙组A、B气层与低速异常的符合率较高，达80％以上，2200m以深的沙溪庙组C气层与中侏罗统千佛崖组气层符合率较低，约20％～30％。
Synthetic records were made from the industrial reservoir determined by drilling and over-seismic traces and calibrated on seismic sections. Re-use of seismic velocity spectrum and layer velocity recursion formula, respectively, and calculate and calculate the velocity of the same time domain with the oil and gas geological body. Adopting the differential velocity stacking method proposed by the American scholar Lydl, the velocity values at the top and bottom of the geological body are superimposed, and the low-velocity anomalous development belt may be the gas layer. Tracing closed by the seismic network is delineated in the plane. This method was applied to the field trial of gas field in the new field. It was found that the gas-bearing intervals of A and B gas layers of Shalaimiao Formation and the low-velocity anomaly in the shallow Jurassic Penglaizhen Formation gas reservoirs at 1600 ~ 2200m were higher than 80% The coincidence rate of C-layer of Shaximiao Formation and Qianfuya Formation of Middle Jurassic with a depth of 2200m is relatively low, about 20% -30%.