Download Finding Oil and Gas from Well Logs by L.M. Etnyre PDF
By L.M. Etnyre
Several first-class books on weil log interpretation have already been released. besides the fact that, i think that those books don't position adequate emphasis at the inherent uncertainties in device responses or at the comparable and intensely useful problern of choosing appropriate information issues for statistical or quantita tive calculations. hence, i've got written this e-book not just to introduce the newcomer to this very complicated paintings and technological know-how, but additionally to supply her or him with the mandatory instruments to supply higher interpretations. the issues on the finish of every bankruptcy are necessary to a extra whole figuring out of the subject material and contain many functional notes according to difficulties i've got encountered in genuine purposes. This publication emphasizes that you simply enhance your individual innovations and figuring out of the underlying ideas, instead of buying a compendium of information in response to sure principles of thumb. while you're to effectively interpret welllogs, try to be capable of follow your wisdom to new difficulties that won't persist with the preconceived rules and ways you will stick with when you approached weil log research from a cookbook standpoint.
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175 with the weighted average porosity represented in the figure by the ratio of pore volume to total volume. 2) porosity and represents a significant difference from the straight average. Thus, a straight average porosity is erroneous. To correctly average porosity, we must weight the porosity data by their corresponding interval thicknesses. Try it for this simple example but substitute the volumes for the thicknesses in Eq. 2-7. SATURATION Before we discuss hydrocarbon saturation or water saturation, Iet us examine the concept of saturation itself.
Capillary pressure measurements on core samples can be used Problems 47 to gain valuable information about the pore size distribution, hence, quality of a reservoir rock. PROBLEMS 2-1. Is the assumption that hydrocarbon saturation is equal to 1 minus the water saturation (expressed by Eq. 2-10) always valid? Explain your answer. 2-2. 20 (using Eq. 2-10). lf you now calculate a correct average water saturation for these two volumes and substitute this into Eq. 2-10 to find average hydrocarbon saturation, would you finally end up with the correct HIP estimate of 279,288 bbl?
In some equations used in log analysis, however, you must carefully check to see whether porosity is specified as a fraction or as a percentage. POROSITY IN SANDSTONES Most porous reservoir rocks are either sedimentary sandstones or sedimentary carbonate rocks. arger if the grainsareweil sorted. However, sandstones usually have low perrneability if the grains are small. Sandstones are classified as orthoquartzite, arkose, or graywacke, according to their relative percentages of quartz, feldspar, and rock fragments.