原状地层 meaning in Chinese

undisturbed zone
virgin zone

Apparatus for drawing soil samples in agricultural engineering ; apparatus for soil sampling in undisturbed situation
农业工程用土壤取样器.第1部分:原状地层的土壤取样器
Accordingly , the effective electrolog information and its preprocess become more important in this paper , the dual laterolog data was corrected through the reversion algorithm on the basis of electrolog theory and the minimum mean square principle
通过电测井资料的预处理，可提供原状地层电阻率、冲洗带地层电阻率以及泥浆滤液侵入半径等3个参数。