山西组指华北平行不整合于奥陶系之上的月门沟群上部地层。由陆相砂岩、页岩、煤构成的旋回层(多个)组成，夹层数不等的含舌形贝及双壳类化石的非正常海相层。下界与太原组整合过渡，上与石盒子组也为整合接触。含腹足类、腕足类、双壳类及植物等化石。
...】: 鄂尔多斯盆地东部；山西组；基准面旋回；层序界面；天然气聚集 [gap=956]Keywords】: east Ordos Basin; Shanxi formation; base level cycle; sequence interface; gas accumulation ..
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Fluvial system is distributed at the north part of the study area, developed during early and late period of Shanxi formation.
河流沉积体系展布于研究区北部，发育于山西组的早期和晚期，以曲流河沉积为主，辫状河沉积不仅分布范围极其局限，而且发育的时限很短。
参考来源 - 鄂尔多斯盆地东北部山西组高分辨层序地层及沉积微相研究特征研究The Shanxi formation is divided into four sections by studying on lithology and gyration.
通过岩性和旋回研究,将山西组地层分为4段。
参考来源 - 平顶山煤田山西组二·2,447,543篇论文数据，部分数据来源于NoteExpress
山西组储层不发育，岩石致密，泥质含量较高。
Shanxi formation reservoir does not grow, the rock compact, the shale content is high.
榆林气田目的层系位于上古生界二叠系山西组底部。
The target strata in Yulin gas field lie in the bottom of Shanxi Formation of Permian, Upper Palaeozoic.
结果显示山西组的古环境以淡水为主，但间或受海水的影响。
And the result shows that the water in paleoenvironment mainly was freshwater, but periodly influenced by seawater.
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