下石盒子组是二叠系华北煤系地层，由灰色、绿色、黄色泥质岩和单色砂岩等组成，夹煤层。含植物化石，属中期华夏植物群 Alethopteris norinii-Emplectopteris triangulari s-Tingia carbonica- Cathaysiopteris whitei组合。
下石盒子组储集层 reservoir of Lower Formation
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研究结果表明，下石盒子组主要为一套近源网状河流沉积。
Research results show that Lower Shihezi Formation is mainly a set of proximal braided river deposits.
鄂尔多斯盆地塔巴庙工区下石盒子组砂岩体主要属平原分流河道沉积，具有低孔、低渗和高阻抗特征。
The sand body at Shihezi formation of Tabamiao area in Erdos basin is mainly plain and fluvial deposits with characteristics of low porosity, low permeability and high impedance.
大牛地气田位于鄂尔多斯盆地伊陕斜坡北部，主要含气层位为上古生界石炭系太原组、二叠系山本组和下石盒子组。
Daniudi gas Field lies in the north of Yishan Slope in Ordos Basin. Its mainly gassy formations are Carboniferous Taiyuan formation, Permian Shanxi formation and Lower Shihezi formation.
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