山东博兴洼陷沙河街组高青砂体的物源及其成因

东营凹陷博兴洼陷古近纪沙三段高青砂体是重要的含油层位。据对高青砂体的等厚图及其物源的分析．该砂体并非源自青城凸起本身，而可能是来自青城凸起西北部。该砂体的主要发育阶段在沙三中、沙三上亚段两个时期。早期砂体由北西向南东逐渐扩展，碎屑来源较单一；砂体发育晚期，同沉积断层活动加剧，砂体在断层附近厚度加大，以厚层块状为主，泥岩夹层增多。通过对该砂体的宏观和微观沉积特征分析，及对各小层序组复合砂体等厚图的编制，认为高青砂体是扇三角洲沉积。

Sand Sources and Origin of Gaoqing Sandbody from Shahejie Formation in Boxing Basin of Shandong Province

Gaoqing sandbody in the third member of the Paleocene Shahejie formation in Boxing Basin is one of the important oil reservoirs in Dongying Sag.Analysis on the sandbody's isopach map and the sediment source of the Gaoqing sandbody has suggested that it is not originating from the Qingcheng Arch itself,but probably from the area northwest to the Qingcheng Arch.The Gaoqing sandbody mainly developed in the two periods of Es2 and Es1.At the early period,the Gaoqing sandbody expanded gradually from northwest to southeast,and the source of sands was relatively simple.During the late period,however,as the syndepositional faulting became more active in the area,the sandbody increased in thickness around the faults,and is characterized by massive to thick beds,intercalated with more mudstones.Based on the analysis of Gaoqing sandbody's macroscopic and microscopic sedimentary features,and compiling the sandbody's isopach map of each parasequence set,Gaoqing sandbody has been confirmed to be of fan delta sedimentation.