Three-component seismic data in thin interbedded reservoir exploration

摘要

We present thefi rst successful application of three-component seismic data to thin interbedded reservoir characterization in the Daqing placanticline of the LMD oilfield. The oilfi eld has reached thefi nal high water cut stage and the principal problem is how to recognize the boundaries of sand layers that are thicker than 2 m. Conventional interpretation of single PP-wave seismic data results in multiple solutions, whereas the introduction of PS-wave enhances the reliability of interpretation. We analyze the gas reservoir characteristics by joint PP- and PS-waves, and use the amplitude and frequency decomposition attributes to delineate the gas reservoir boundaries because of the minimal effect offl uids on S-wave. We perform joint inversion of PP- and PS-waves to obtainVP/VS,λρ, andμρ and map the lithology changes by using density,λρ, andμρ. The 3D–3C attributeλρ slices describe the sand layers distribution, while considering the well log data, and point to favorable region for tapping the remaining oil.