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General Feature of Reservoir in Coal-bearing Formation and Distribution of the Favorable Reservoir
Author(s): 
Pages: 891-895
Year: Issue:  6
Journal: ACTA SEDIMENTOLOGICA SINICA

Keyword:  优质储层煤系地层沉积相层序地层四川盆地鄂尔多斯盆地;
Abstract: 通过对鄂尔多斯盆地和四川盆地煤系地层中发育的优质储层分布规律研究,发现优质储层主要受层序界面、有利沉积相带、有机酸性水的溶蚀作用等因素控制.一般来说,优质储层主要分布在三级层序的中下部、三角洲平原或前缘多期分流河道叠置的部位.它们在有机酸性水大量形成时期保留了较多的原生孔隙,酸性水容易进入并溶解其中易溶的碎屑颗粒,产生大量次生溶蚀孔隙,从而形成相对优质的有效储集层.因此,优质储层纵向上与不整合面或层序界面密切相关;平面上受沉积有利相带或断裂带的控制.
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