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The Characteristics of Sediment-Diagenesis of Yanchang Series in Trias in the Western Edge of Ordos Basin;

鄂尔多斯盆地西缘三叠系延长统沉积——成岩特征及有利区块预测

Yanchang series is a typical low permeability reservoir,and its favourable sandstone reservoir is delta facies.

陕甘宁盆地三叠系延长统是国内外典型的低渗特低渗油田 ,储集层主要为三角洲砂体 ,压实作用和胶结作用强烈 ,储层非均质性非常严重 ,因此预测次生孔隙发育带是寻找油气聚集带的关键 。

Based on deltaic sedimentary background in Yanchang Formation, 7 sedimentary microfa- cies, such as subsea distributary channel, subsea natural barrier,subsea crevass-splay and mouth bar etc.

根据延长统三角洲的沉积背景,通过15口取心井岩石相及其组合的分析,在长3段4+5油组和6油组共识别出水下分流河道、水下天然堤、水下决口扇及河口坝等7种沉积微相。

Formation Process and Distribution of Laumontite in Yanchang Formation (Upper Triassic) of Ordos Basin;

勘探结果证实延长统找到的油藏大部分都聚集在这些浊沸石次生孔隙中。