One important observation from this table is that the column containing the group in parenthesis in Equation 3.14, ( 2 ∑ z MW ), is approximately 1.0. Table 3.04: Properties for Density Log Interpretation Compound Table 3.04 contains the term in the parenthesis for common substances related to oil and gas production.
#TECHLOG ROCK CLASSES TAB SERIES#
The logging tool consists of one or more transmitters and a series of receivers. The Sonic Log measures the acoustic transit time, Δt, of a compressional sound wave traveling through the porous formation. The log evaluations are also calibrated against core porosity in wells where both core and logs are available. Since many variables may impact the log readings, corrections need to be applied to the log interpretations and the three logs are typically evaluated together to determine the best estimate of the porosity of rock formations.
![techlog rock classes tab techlog rock classes tab](https://www.software.slb.com/-/media/software-v2/software/images/page-thumbnails_308x181/techlog/techlog-petrophysics.jpg)
Due to the expense of obtaining core samples, typically only a few wells are cored. Well logs are tools sent down the wellbore during the drilling process which measure different reservoir properties of interest to geologists and engineers.
![techlog rock classes tab techlog rock classes tab](http://publications.iodp.org/proceedings/372B_375/102/figures/372B375_102_F05.png)
The most common method of determining porosity is with Well Logs.