鄂尔多斯盆地东部山西组早期古海岸线恢复

Comeback of the Paleo-Coastline in Forepart of Shanxi Formation of Eastern Ordos Basin

鄂尔多斯盆地东部山西组早期石英砂岩的成因有海相、非海相之争，海岸线的位置也存在一定争议。在前人大量研究基础上，根据沉积构造、粒度分布、钍／铀、锶／钡、煤层中硫分含量及测井曲线组合特征，确定了山西组早期古海岸线位于靖边-榆林一线，明确了石英砂岩优质储层分布区，优选了塔湾一高桥地区勘探目标。

There is a dispute of marine or non-marine facies of quartz sandstone genesis of forepart Shanxi Formation of eastern Ordos basin. There are also some controversy about the position of the coastline. According to the sedimentary structure, particle size distribution, thorium/uranium, strontium/barium, sulfur contents in the coal beds and log-curve combination characteristics, it is determined that the paleo-coastline in forepart of Shanxi Formation was located at the line of Jingbian-Yulin, on the basis of the predecessors＇ considerable amount of researches. High-quality quartz sandstone reservoir distributed areas are defined, and the Tawan-Gaoqiao region is selected as exploration targets.