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Table 2 Results for shore-based analysis of drilling mud gas samples

From: Real-time drilling mud gas monitoring for qualitative evaluation of hydrocarbon gas composition during deep sea drilling in the Nankai Trough Kumano Basin

Sample ID 338-C0002F-00 Sampling vial Total depth (mBRT) lag depth (mbsf) C 1-QMS(ppm) C 1-GC(ppm) C 2-GC(ppm) C 3-GC(ppm) δD CH4(‰, VSMOW)
244GMW-WR Glass 2817.5 850 NA 2220 8 4 NA
013GMW-WR Glass 2867.5 900 9610 6830 4 BD BD
023GMW-WR Glass 2917.5 950 49800 420 BD BD −164
033GMW-WR Glass 2967.5 1000 25300 96 BD BD −167
033GMW-WR Iso 2967.5 1000 NA 690 BD BD NA
070GMW-WR Glass 3067.5 1100 12600 10350 18 2 −170
079GMW-WR Glass 3167.5 1200 6360 4490 11 1 NA
079GMW-WR Iso 3167.5 1200 5080 3940 10 BD −166
128GMW-WR Glass 3267.5 1300 3800 3120 6 1 −167
129GMW-WR Iso 3367.5 1400 5040 2460 4 BD −167
146GMW-WR Glass 3467.5 1500 1940 1650 7 BD NA
180GMW-WR Glass 3517.5 1550 1380 570 BD BD ND
181GMW-WR Glass 3567.5 1600 2300 440 2 3 NA
181GMW-WR Iso 3567.5 1600 440 2000 5 BD −164
197GMW-WR Iso event 3572.3 1604.8 960 190 BD BD BD
225GMW-WR Glass 3667.5 1700 4340 4140 9 2 −166
226GMW-WR Glass 3717.5 1750 2580 1930 5 BD NA
243GMW-WR Glass 3767.5 1800 1580 2670 6 BD −169
263GMW-WR Iso 3767.5 1800 1890 43 BD BD NA
277GMW-WR Glass 3867.5 1900 4050 1200 4 2 −171
278GMW-WR Glass 3917.5 1950 950 630 3 2 NA
305GMW-WR Iso 3955 1987.5 1360 1060 5 3 −166
391GMW-WR Glass 3965.7 1998.2 2140 184 2 BD NA
  1. Results for shore-based analysis of drilling mud gas samples (iso = Isotube, glass = glass flask, iso event = event gas sampled with Isotube). Total depth is the depth of the borehole when the mud gas was sampled. Lag depth is the sampled depth corrected for the time the drilling mud needs to circulate from the drill bit to the ship. NA denotes “not available”, and was used for samples where the gas concentration in the sample vials was too low for further measurements; BD = below detection limit, mBRT = meter below rotary table; mbsf = meter below seafloor.