松辽盆地南缘籍家岭泉头组露头河道单砂体分布特征

Distribution of single sand body deposited by river channel in Quantou Formation of Jijialing Outcrop,Southern Margin of Songliao Basin

采用露头和孔距为20 m的密井网钻孔资料,分析了砂岩复合体的单砂体分布特征.结果表明:在露头断面,砂岩复合体内部的冲刷面明显地反映出该砂岩复合体为5期河道单砂体的叠合而成,5期河道形成的单砂体由早到晚分别命名为A,B,C,D,E砂体.A,B,C砂体分别发育于研究区的西侧、中东部和西部,D砂体则占据了整个研究区,E砂体分布于研究区的东侧.后期河道过程明显冲刷、改造了前期河道的沉积物.砂体的分布总体上展示了河道由西向东的摆动过程.在露头断面,由5期河道砂体直接叠置形成的复合砂体;在空间上,砂体间存在泥质隔层.河道单砂体分布特征认识深化对油气资源的勘探和开发具有重要意义.

The distribution of the single sand body of the sandstone complex has been studied particularity based on the detail data of outcrop and dense drilling hole(20m in space).In the outcrop section,there are 5 period channel single sand bodies recognized by the erosion surfaces in the sandstone complex.The 5 period channel single sand bodies are named as A,B,C,D and E respectively.The A,B and C sandstone bodies respectively developed in the western margin,middle-eastern part and western part,the D sandstone body developed in the most part of the studied area,dominating in the outcrop sandstone bodies,and E sandstone body just developed in the eastern margin of the studied area.The distribution of these sandstone bodies revealed the main process of the channel switched from west to east.In the outcrop section,the 5 period channel sandstone bodies directly stacked forming sandstone body complex,and in space,there are mudstone layers separating the different period channel single sand body.The study of distribution of single sand body has significance for oil and gas resources exploration and development.