GEOG 4891 Lecture Notes - Lecture 11: River Source, Water Content, Unconformity
Document Summary
One of the first use of well logs was correlation of equivalant strata from one well to the next. this is still one of the most important uses. Intervals of logs from different wells are matched for similarity or for characteristic log responses to lithological markers. Well logs have the advantage of providing a continuous record over the entire well. There are no missing sections as can be case with core samples. Most important, because sonde depth is recorded, there is no ambiguity as the depth of various markers. Well to well correlation studies thus permit accurate subsurface mapping and the determination of: The elevations of formations present in the well relative to other wells, outcrops, or geophysical projections. Whether or not the well is within a given major geological structure. Whether well depth has reached a known productive horizon, and if not, approximateley how much remains to be drilled.
