Examples of borehole

• 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.