辽河油田西部凹陷沙河街组远岸浊积扇

以钻井岩芯、测井和地震资料为基础 ,分析了辽河油田西部凹陷西斜坡沙河街组远岸浊积扇的沉积相、测井相和地震相特征 ,认为中扇辫状水道沉积区以其分布范围广、厚度大、储集性最好等特征而成为远岸浊积扇最重要的骨架砂体和油气储集单元。总结远岸浊积扇的时空分布规律与构造沉降的关系 ,确定沙三上、中、下各亚段中的远岸浊积扇虽具不同的沉积演化特征 ,但总体上具有从沙三下亚段到上亚段中扇辫状水道沉积区面积逐渐增大、并向洼陷方向迁移加厚的趋势。通过上述分析 ,为进一步确定该区远岸浊积扇生储盖组合规律和进行有利储集相带的预测及评价奠定了良好的基础

The distal turbidite fan of Shahejie Formation, Lower Paleogene in West Depression, Liaohe Basin

On the basis of the logging, drilling and seismic data, the authors analyse the sedimentary facies, electrofacies and seismic facies of the distal turbidite fan in the Shahejie Formation, Paleogene in the West Depression from the Liaohe oil field, consider that the braiding channels in the middle fan are the important skeleton sand bodies and the oil and gas bearing horizons for their widespread distribution, huge thickness and best reservoir characteristic, and also summarize the relationship between the space time distribution rule and tectonic descent of the lake floor fan in the Shahejie Formation. In the research area, the distal turbidite fan is controlled by the tectonic, so it develops different features in each sub member in the third member. In summary , the area of the braiding channels of the middle fan in the upper part of the third member is bigger than that in the lower part and the thickness in the depression is thicker than that in the slope. Through the analysis above, the authors laid a good foundation for further forecasting and appraising the assemblage rule of the source reservoir cap rock in this area.