"Your familiarity with the subject matter is indeed slight". Ah but unlike you shaw I am quite happy to admit it. And I have spent the last 47 years as a professional geologist practising in several different fields, wearing several different hats. I do not claim papal infallibility, unlike your goodself. I have absolute confidence that I am not perfect and have not the slightest problem with admitting to a lack of detailed knowledge in certain areas of geology and a host of other subjects besides. But when it comes to seismic I have opened the toy box and used the data from some of the tools such as VSP and look ahead seismic, so I have sufficient knowledge to use the data in certain applications. I also do not require lectures on what units to use in scientific reports or papers. It is a case of horses for courses. The US is not fully using SI units yet, a common density unit is pounds per gallon in the oil industry. The most frequent geophysical log run in a well measures gamma rays. The units of measurement are API units running roughly from 0 in coal to 100+ in shales and the calibration is based on a bit of limestone sitting in Houston, I believe. Not an SI unit anywhere in sight. If you have a well control situation you really do not wanting to be having a conversation about why someone feels you should be using SI units. You need to be using the units that the oil company and rig crew are conversant with because when people screw up well control situations can easily escalate from kick to blow out. I have encountered many of the former and worked on relief wells for the latter. It does concentrate the mind and encourage you ensure everyone is singing the same toons on the same page, with the same language and same measurements even if it includes furlongs a fortnight.