东营凹陷北部陡坡带沙河街组四段砂岩成岩作用

东营凹陷是重要的油气富集区,在北部陡坡带沙河街组四段发育有近岸水下扇和扇三角洲沉积等砂岩。砂岩的成岩作用对储层的储集性能有重要影响。文章在对大量薄片和岩芯进行分析的基础上,运用铸体薄片观察和扫描电镜等手段,对东营凹陷北部陡坡带沙四段砂岩储层的成岩作用进行了研究。研究结果表明,东营凹陷北部陡坡带地区沙河街组四段砂岩主要受压实作用、胶结作用、溶蚀作用等成岩作用的影响比较大,其中压实作用和胶结作用对空隙的形成具有破坏作用,溶蚀作用对空隙的形成具有建设性作用。

Dongying sag is an important oil-gas rich area. In member 4 of Shahejie formation of the north steep slope belt, theredeveloped sandstone like nearshore underwater fan and the fan delta deposit. The diagenesis of sandstone plays an important role inreservoir performance. Based on the analysis of a large number of thin slices and cores, the diagenesis of sandstone reservoirs inmember 4 of the steep slope zone in the north of Dongying sag is studied by means of casting thin section observation and scanningelectron microscope （SEM）. The results show that the sandstone in member 4 of Shahejie formation in the steep slope zone of thenorthern Dongying sag are mainly affected by diagenesis, such as compaction, cementation and dissolution. Compaction and cementa-tion play a destructive role in the formation of voids, and dissolution playsa constructive role in the formation of voids.