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物源分析对砂岩储层的展布与分析预测具有重要的意义。通过对鄂尔多斯盆地西南缘庆阳-合水地区上三叠统延长组长8油层组的砂岩重矿物组合、轻矿物组合及砂岩岩屑组分的平面分布特征分析,判断了庆阳-合水地区的沉积物源方向。研究表明,庆阳-合水地区存在两大物源和古流沉积体系,即西南方向的庆阳沉积古流体系和南部方向的合水沉积古流体系;长82亚组沉积期以南部的沉积古流体系为主,而长81亚组沉积期以西南部的沉积古流体系为主;重矿物组合特征分析显示长81亚组沉积期合水区带混源现象明显。
The provenance analysis is of great significance to the distribution and analysis of sandstone reservoirs. Based on the analysis of the distribution of sandstone heavy minerals assemblages, light mineral assemblages and sandstone lithofacies components in Chang 8 reservoir of Yanchang-Hethui area in the southwestern margin of Ordos Basin, Area of sediment source direction. The results show that there are two provenances and paleocurrent depositional systems in the Qingyang-Hethui area: the Qingyang sedimentary paleocurrent system in the southwest direction and the synsedimentary paleocurrent system in the south direction; the sedimentary paleocurrent system in the Chang-82 sub-sedimentary period is While the sedimentary period of the Chang 81 sub-group was dominated by the sedimentary paleocurrent system in the southwestern part. The analysis of the heavy mineral assemblages showed that the mixed sources of the Chang 81 sub-group during the sedimentary period were obvious.