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HISTORY OF LOGGING -- FIRST LOGS ON LUNA and MARS
LOGS FROM OUTER SPACE
A log is a record of some observation versus time or distance, presented on an X-Y coordinate graph, a written narrative, or an audio or video report. Pilots, truckers. taxi-drivers, and tourists all keep logs. So do oil well drillers and other intrepid explorers who walk the Moon or operate robots on or near other planets. We even have logs from interstellar space. The Voyager 1 spacecraft, launched in Sept 1977, has recorded logs over the longest distances yet measured.
The documented geological record of the Earth is the longest time-based record so far, unless you want to count the less-well documented history of the Universe beginning before the Big Bang.
To celebrate the 40th Anniversary of the Apollo 11 moon-walk by Buzz Aldrin in July 1969, let's look at the Lunar logs run 2 years after that famous "Giant Leap for Mankind".
Lord Kelvin's temperature / heat flow experiments in 1846 (and onward) were duplicated by Apollo 15 astronauts on the lunar surface in June 1971. The holes were only 1.5 to 3.2 meters deep and the logging tool was stationary, but the results were recorded versus depth, so these surveys are the first petrophysical logs recorded off planet Earth.
<== Dave Scott of Apollo 15 running the first logs on the Moon in 1971
Apollo 17 astronauts repeated these temperature surveys and Apollo 16 and 17 crews also ran surface resistivity (EM style) surveys, similar to Conrad Schlumberger's early work in France.
The lunar results: "The Moon is very dry". Golly, who would have guessed that? But don't despair. The moon has been mapped for neutron absorption and some areas absorb neutrons better than others. Hydrogen, hydrocarbon, or water? Or some other absorber (like iron for example)? Who knows.
Schmidt deploying the Surface Electrical
Below are samples of the temperature logs taken during Apollo 15 in 1971.
Shallow cores were taken during Apollo 15, 16, and 17 missions. Rocks were also analyzed in-situ with X-Ray fluorescence and photography. Samples of rocks were returned to Earth and subjected to myriad tests, much as we have done for many years on Earth in the oil and mineral business. Sample lunar cores are illustrated below.
FIRST LOGS ON MARS
Phoenix was equipped with a miniature back-hoe (called the Robotic Arm or RA for short) to dig trenches and deliver soil samples to other experiments inside the space craft. The TECP probe was mounted on the pivot at the RA scoop so it could be pressed into the surface soil or the wall of a trench.
TECP is the 4-pin
device above the Robotic Arm scoop near
The TECP is adapted from the commercial KD-2 multi-purpose probe made by Decagon Devices. The four-pin probe determines electrical conductivity by a two-pin LC (dielectric constant) approach and a redundant four-pin van der Pauw technique. The 4 pin EC method is similar to the Schlumberger four electrode AMNB surface resistivity electrode arrangement from the early 1900's.
Thermal conductivity is measured by a pulse-decay method using a heater and a thermocouple pair embedded in the pins.
<== Commercial version of the TECP device
The primary purpose of the TECP was to measure the concentration and nature of water in Martian soils in solid, “non-frozen,” liquid, and vapor states. Other objectives were to determine changes in the reservoirs of water when soil is freshly exposed and to characterize the movement of water in and out of the soil by measuring atmospheric humidity, temperature, and wind speed above the surface. Sounds a lot like reservoir evaluation and monitoring.
There are hundreds of ASCII data files available with the results of the TECP measurements, recorded versus time and day of acquisition. None appear to have been plotted versus depth in the trenches that were dug by the robotic arm. However there are lots of images that are strikingly similar to resistivity microscanner images.
Phoenix was purposely placed on the Martian Arctic Plain. It is cold there, but not impossibly so - a mere 70 C colder than the Canadian Arctic Islands, where we have found more than 17 Tcf of natural gas. So who is ready to drill on Mars?
<== A log of minimum daily temperature for 120 Martian days (Sols) recorded by the Canadian built Phoenix MET station. (a Mars day is 24.65 Earth hours and a Mars year is 685.8 Earth days , so winter is nearly twice as loooooong as here at home).
The meteorological station on Phoenix was designed to monitor changes in water abundance, dust, temperature, and other variables in the Martian atmosphere. The Canadian Space Agency, York University, University of Alberta, Dalhousie University, Optech, and the Geological Survey of Canada designed and monitored the science operations of the station, which was built by Canadarm maker MacDonald Dettwiler and Associates Ltd. of Richmond, B.C.
Prototype robotic drilling rig for Mars ==>
The prototype robot drilling/coring/logging machine reached 10 meters. Plans for 100 meter capability are in the works. The objective is to advance the search for life on Mars, but where there is life, there is a possibility of hydrocarbons. There is methane in the Martian atmosphere and spectroscopy mapping indicates the presence of clay and carbonate rocks, as well as the more obvious lava, dust, and other sediments. Interested parties can apply HERE for drilling concessions.
MARTE can drill, core, and run neutron and fluorescence logs. Neutron logs see water and ice; fluorescence logs see bacteria. The Ames tool is so sensitive, it can see a single bacterium. The core samples can be analyzed on the drilling platform, then stacked for future examination. The remote sensing core analyzer can face or saw core samples, run spectrography, and prepare powder samples.
The borehole inspection system (BHIS) runs the neutron probe, a panoramic microscopic imager, and spectrometer. The borehole neutron log (BneuP) measures both thermal and epithermal neutron count rates. A surface version of the tool, to be carried on a Mars rover, is called (you guessed it) SneuP. It is intended as a dowsing machine, looking for hidden near surface water or ice deposits.
It's all real and working (almost). We just have to get it there and get to work.
All image credits: NASA/JPL