In the lower part of Member 3 of Shahejie Formation, the main reservoir types are fan-delta and sublacustrine fan facies. 沙三段下亞段主要儲層沉積相類(lèi)型為扇三角洲相和湖底扇相。
The fan delta front sandbody is the most advantageous zone of petroleum accumulation because of its great thickness, coarse grainsize, well sorting and good physical properties. 扇三角洲前緣砂體單層厚度大，砂巖粒度較粗，顆粒分選及物性好，是石油富集的最有利相帶。
