underlying strata

基本解釋

There exists a large-scale transgressive onlap boundary between the Langshan Formation and its underlying strata.
證實郎山組與下伏地層之間存在一大型海侵超覆界面；
It is revealed that the lead in the deposit is mostly derived from the volcanic rocks and partly from the underlying strata.
礦床中的大多數硫由火山熱液提供的，部分來自海水。
The subaerial and subaqueous volcanic rocks have significant differences in lithology, texture and structure, alteration, occurence, contact with underlying strata, pore and fissure development.
在充分考慮火山巖儲層特征和地層非均質性的基礎上，運用常規(guī)測井信息、氣測錄井及測井新技術對火山巖儲層進行綜合評價。