Abstract: The Paleogene delta deposits in the Bohai oilfield developed glutenite reservoirs with huge thickness (greater than 100 m), and
seismic prediction of these reservoirs is difficult because of the quick lateral change and strong internal heterogeneities. To solve this problem, we propose a quantitative thickness characterization of thick glutenite reservoir based on interpretation chart in this study. Firstly, the geological model at well points was established according to the existing drilling data, and the possible reservoir change forms were analyzed by combining the existing geological data. Secondly, the geological model database was formed, and the database of corresponding forward seismic response was obtained by forward modeling. Then the seismic amplitude attributes were extracted, and the thickness interpretation chart, which represents the relation between the thickness and the seismic amplitude attributes of glutenite reservoirs, was established. Finally, the seismic amplitude attributes in the study area were extracted and projected onto the chart to characterize the quantitative thickness of thick glutenite reservoirs. This method overcomes the difficulty of conventional inversion and seismic attributes in effectively characterizing thick glutenite reservoirs. It can accurately and quantitatively characterize the thickness and internal variation of thick glutenite reservoir with interference effect.

Key words: interpretation chart, glutenite reservoir, quantitative characterization, forward seismic data, Dongying Formation, Bohai
oilfield