INSTRUMENT FOR SOIL SURFACE ANALYSIS AND USE FOR ANALYSING THE WALL OF A WELL IN PARTICULAR AN OIL WELL

摘要

The invention concerns instruments for analysing soil (1) from its surface ( 2) using a probe (3) having a given analysis lobe (4) and a resolution time (T) . The inventive instrument is essentially characterised in that it comprises a driving head (10) driven in a continuous translation motion at a speed (V) relative to the surface (2) and along a direction (11) parallel to the surfa ce (2), a shoe (12), means (13) for associating the probe (3) and the shoe (12) such that the probe can analyse the rocks contained in its lobe (4), and mea ns (14) for coupling the driving head (10) and the shoe (12) such that said two elements can move relative to each other along a direction (11) over a distance (D). The inventive instrument is particularly useful for analysing oil-bearing rocks enclosing the wall (30) of an oil well (31), for example f or determining the distribution of porosity of the rocks and their related permeability.