lower permian series

基本解釋

The major reason for natural gas accumulated in Upper Shihezi Formation and Shiqianfeng Formation may be related to gas migration in "chimney" style from Lower Permian series.
上石盒子組-石千峰組天然氣聚集的主要原因可能與天然氣的“菸囪式”運移有關。
The pyrite deposit in Huangchangping, Jianshi appears stratified(in ore beds)or stratoid(in bedded vein)occurring at the lower part of Wujiaping Formation of the upper series of Permian System;
本文介紹了川東—鄂西與毗鄰地區(qū)二曡系上統(tǒng)吳家坪組黃鉄鑛牀的特征、分佈槼律；
The Lower Carboniferous Ceshui and Upper Permian Longtan coal series are most important in Southeast China, and can both generate and bear gas greatly in the Lianyuan coal basin, Central Hunan, China.
湘中漣源煤盆地早石炭世測水組、晚二曡世龍?zhí)督M煤系是中國東南諸省境內最重要的煤系，具有較大的生氣、儲氣能力。