Weathered layer absorbs seismic waves greatly. Compensation for the absorption due to weathered layer can improve resolution of seismic data.
There are 4 layers in typical profile of slope disintegration: the red soil layer, the sandy soil layer, the detritus layer and the crack weathered layer(also claimed the globular weathered layer);
Thispaper makes use of surface waves to find Q-Value in weathered layer.
Such low velocities are usually seen only near the surface in a zone called the weathered layer or the low-velocity layer.
Qianceng stone is also called the overburden rock, belongs to Marine facies sedimentary crystalline dolostone, stone is hard and dense, appearance has weathered layer is very thin, soft;
To raise wire-line drilling efficiency need to: 1. Select casing diameter and depth according to drilling depth, diameter, strata drilled and rock integrity, structure features, weathered layer depth;
