n. underlayer
证实郎山组与下伏地层之间存在一大型海侵超覆界面；
There exists a large-scale transgressive onlap boundary between the Langshan Formation and its underlying strata.
结果表明，研究区须家河组的天然气主要来源于下伏地层。
The results indicate that the natural gas of the Xujiahe Formation mainly derived form the lower strata.
松辽盆地火山岩埋藏较深，下伏地层成像精度极低，对构造解释造成了一定的影响。
The deeply buried volcanics in Songliao basin leads to very low imaging accuracy for underlying formation, which has some negative effect on the structure interpretation.
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