Figure 3From: Real-time drilling mud gas monitoring for qualitative evaluation of hydrocarbon gas composition during deep sea drilling in the Nankai Trough Kumano BasinResults of onshore methane analyses and comparison with shipboard data from Geoservices. Methane determined by (A) the QMS (C1-QMS; red dots) and by GC (C1-GC, black triangles) compared with shipboard methane data from Geoservices (C1-Geo; blue squares and line). Please be aware of the different scales of the individual x-axis at the bottom and at the top. B: Lithological column, modified from [23]. “Underreamer depth” denotes the position of borehole widening and potential additional gas release caused by the underreamer. Borehole widening took place around 40 m above the borehole depth. See Methods section.Back to article page