Units 2 and 3 have been grouped since they cannot be distinguished from one another in every borehole.
The accuracy of the stripping model depends on the available borehole, seismic and density data.
The most obvious application of palaeomagnetism to oilfield investigation, namely borehole to borehole correlation, actually proves to be the least efficacious.
Of particular note are the new borehole data from the lowermost part of the formation which does not crop out in the type area.
Although the quality of the available information is uneven, an accurate analysis and filtering of the borehole logs provides a useful database of subsoil geology.
This provides the basis for in situ subsurface analysis of the geology, mineralogy and organic chemistry of the borehole environment.
Short final chapters on radiometric methods and drilling and borehole logging complete the book.
In a typical well with an inclined borehole, the heavy steel casing lies eccentrically towards the lower side of the hole.
