By Prof. Dr. Stefan M. Luthi (auth.)
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12 is a proposed interpretation according to which a fault was crossed 49 o 1000 2000 \ Fauh ~. 3000 ~ '1\ 4000 sooo 'f. [\.. -- 9000 C- '>---- -'- Il-r--t-- , . 11. An early dipmeter survey illustrates the fundamental task of the dipmeter interpreter: To infer the near-wellbore geological structure (redrawn from unpublished internal documents, Schlumberger, c. 1940). just below 3000 feet, and the salt overhang was narrowly missed at about 8000 feet. 13). e. there are more than one possible solutions.
When compared with porosities measured on cores, there are generally only minor differences that are attributed to decompaction of the cores, the different types of measurement, or an incomplete correction of the lithological effects on the logs. Very often, a combination of neutron, density, and acoustic logs is used to calculate the formation porosity, since this allows correcting for lithological effects. 6). The uninvaded resistivity R t is more difficult to obtain because all resistivity measurements are influenced by the resistivity of nearby layers and by the resistivity of the invaded zone in the immediate vicinity of the borehole wall.
Wells at other locations may show significantly different dip patterns. f: Angular unconformity. Sedimentation immediately above the unconformity is often coarse with poor layering, resulting in scattered dips. Downlaps may be similar but with much gentler dips. 53 shown. All sections are east-west and at a right angle to the strike direction of the structures. 14. 3, together with those structural features ("measurable elements") that can be quantified. For the latter, recourse to the stereonet is often needed.