By W. M. Telford
The content material of this publication is past reproach - solid, certain strong technical details. that is why i purchased it. it is a bit past me as a geologist yet I will not outgrow its content material and that matches me superb. i used to be dissatisfied by way of the e-book caliber although. I knew it used to be a paperback, however it turns out a very flimsy paperboard, and for a e-book of this dimension and density, it quite wishes a hardback or a stiffer, harder paperback disguise. this can be a operating publication which would turn out in a box camp, and for US$70, i'd delight in a hardback. extra importantly, the textual content caliber is bad, as are the photographs. I in comparison it to the unique (which our workplace has a duplicate of) and it sort of feels they've got scanned the unique booklet and digitally revealed it. The textual content has an stressful blur, similar to photocopies, and the photographs (never the simplest within the unique) are furthur degraded and contrasty.
A for content material, C for attempt. B total.
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Extra info for Applied Geophysics
For a gas-only reservoir, the pressure will rise above the GWC on a trend corresponding to a gas gradient (but intersecting the waterline at the FWL). Note that the above considerations have nothing to do with the “transition zone” that relates to the interval between the OWC or GWC and the point at which hydrocarbon values start to approach “irreducible” values. This will be discussed in Chapter 4. In poor-quality rocks, the effect of entry height can be appreciable (up to tens of meters). It may have the effect of causing the OWC/GWC to vary in depth across the field if the reservoir quality is changing.
In n measurements, the plugs will have been flushed with brine, then desaturated (either with air or kerosene) to yield measurements of true resistivity, Rt, vs Sw. By plotting the logarithm of the resistivity index, given by log(I) = log(Rt /Ro), against log(Sw), according to Archie: log( I ) = - n * log( Sw ). 2) Therefore, the gradient of the line gives n. Note that the higher the n value used, the higher the Sw that will be calculated, and vica versa. 5) may be indicative of a mixed or oil-wet system and require further investigation.
The error introduced when two such random devices are compared is much higher than when one such device is used on its own. 2. The neutron is severely influenced by the amount of chlorine atoms in the formation, occurring either in the formation water or in the clay minerals. ). 3. The neutron is also affected in an unpredictable way by gas (unlike the density, for which a correction can be made using the appropriate rhof). 4. I have never had much faith in the overlays presented on standard neutron/density crossplots by the contractors.
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