In very thinly bedded sand-shale sequences, sand counts and sand/total ratios can be determined from high resolution electrical images of the borehole wall. This technique is illustrated here by a case study ~·n turbidites with sand laminae down to 1 em in thickness. The numerical modeling of the tool response and a comparison with fullbore core data help assess the accuracy of bed thicknesses derived from electrical images for this type of formations.
Thla'paper wea aekcted for praaentalion by an SPE Program Committee followingreview of informatkmcontained in en ebatract aubmltted by the author(a).Contente of the paper, aa presented, have not been rwlewed by the society ot Petroleum ErrOwem Ondare autiwt towxmction Wthe aUtfIONO). Thomat.fid M -td * not~k~ã ny poeitiorrof the Sociaty of PetroteumEngineers, Itaofficers,or members. Pepera praeented at SPE meetingsare subject to publicetkonreview by EditorialCommltteea of the &roiaty of PstroteumEnginaara Permieeionto copy is reefriotedto en abstractornotmc+ethen S00 words.Illuetratbnamay motbe copied The abetrecfehoutdcontaincon@cuw acknowMpmt of where and by whom the paper lapraeented. Writs Publications Manager, SPE, P.O. *X -, RichardeorhTX 7~. Telax, 7S09S9 SPEDAL. ABSTRACTIn very thinly bedded sand.abate sequence.r, uand count8 and imnd/total ratioo can be determined from high resolution elec. trical imagea of the borehole wall. Thi6 technique ia ilhdrated here by a caae study in turbiditea with sand laminae down to I cm in thickneaa. The numerical modeling of the tool response and a comparison m"th jullbore core data help asaess the accuracy of bed thicknesses derived from e!ectricrd images for this type of{ormationa.
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