关键词: 东营凹陷, 沙河街组, 古近系, 现河油田, 河道型储层, 描述方法

Abstract: On the basis of core observation and logging data, the sedimentary facies and their characteristics of stream channel reservoir in the second member of Shahejie Formation in Xianhe Oilfield of Dongying Depression were studied. The trend surface analysis and shale color district figure combining with sedimentary palaeogeographic pattern and inherit of provenance direction were applied to analyze provenance direction. The analysis result showed that the provenance from first to fourth group in the second member of Shahejie Formation in the third area of Wangjiagang Oilfield was mainly derived from the south part of the study area. The drilling ratio analysis method and the average thickness curves of sand body can illustrate the features of reservoir. The suitable drilling profile was applied to stochastically modeling of reservoir, and the artificial neural network method was used to predict reservoir thickness and porosity from the first to fourth group in the second member of Shahejie Formation. The result is in good agreement with those known well data. The seismic coherence cube technology was used to remove noise and interpret seismic data for finding out types, features and geologic attributes of correlation abnormal volume, researching on the time-space appearances and distribution of every sand layer and predicting the typical single sand-body. The results provided evidence for petroleum exploration and development.

Key words: Dongying Depression, Shahejie Formation, Paleogene, Xianhe Oilfield, stream channel reservoir, description method