鄂尔多斯盆地中西部延长组碎屑岩物源分析及储层特征

Provenance analysis and reservoirs characteristics of the clastic rocks from the Yangchang Formation in west-central Ordos Basin

综合运用砂岩碎屑组分及岩屑分布特征、砂岩阴极发光特征、重矿物组合特征变化、古水流方向等物源分析,对鄂尔多斯盆地中西部长6油组进行物源分析,认为变质岩、酸性岩浆岩、浅海相碎屑岩及碳酸盐岩为研究区主要的母岩类型,东北、西南部是研究区的主要物源方向,西北、西和南部是为次要要的物源方向。物源是影响储层的重要因素,物源的不同造成研究区砂岩类型、填隙物组成及储层物性特征的差异。

The provenance analysis of the clastic rocks from the Chang-6 oil reservoirs in the west-central Ordos Basin is based on sandstone composition, cathodotuminescence, heavy mineral assemblages and palaeocurrents. The types of parent rocks include metamorphic rocks, acidic magmatic rocks and carbonate rocks. The sediments are derived primarily from the northeastern and southwestern parts, and secondly from the northwestern, western and southern parts of the basin. These provenances may have exerted an important effect on the types, compositions of interstitial materials and physical properties of sandstone reservoirs.