Chemical and Noble Gas Isotope Compositions of Formation Gases from a 3 km Deep Scientific Borehole in the Koyna Seismogenic Zone, Western India

Figure 3

Schematic diagram showing (from left to right) replacement of drilling mud by water after each coring run, and the water in the borehole is then progressively flushed out from top to bottom of the pilot borehole KFD1 in ~100 m intervals.