Abstract：Using the spectrum decomposition technique by discrete Fourier transform in short window a-chieves the object using imaging feature of tuning amplitude in frequency domain to study the regularity of lateral variation in reservoir and fully dig up seismic resolution capability in dominant-high frequencies of seismic data. The paper introduced the basic principle of spectrum decomposition technique, categories of spectrum-decomposed data volumes and interpolation methods, fully used a series of amplitude-tuning data volume with single frequency from spectrum decomposition to study near-source sedimentary sand-gravel rock reservoir in Tiejianglu area in west slope of east sag, Liaohe basin,and clarified the planar distribution of sedimentary facies zone of the reservoirs and lateral distribution feature of effective reservoirs. The predicted results have been proved by drilling results.
