Reservoircharacterizationof Pliocene sandusingquantitativeseismictechniques andwell logsatwest offshore Nile Delta, Egypt

Abstract

NileDelta isacomplexanddifficultprovince for hydrocarbon exploration, the Pliocene channel prospectislocated inthe NorthAlexandria BlockBconcessionandisacomplex,elongated,highly sinuous,deeply incised,mature Plioceneturbiditechannelsystemthatextends15Kmacross theWestNileDelta.Thestudyareaisaffectedbythreemainfaulttrendsand themain sand reservoiris KafrElsheik Formation. 3D traditional seismic interpretationwas done foridentification ofthe channeltopandbaseandstudying thelateraldistributionofthechannel.The Pliocenechannelprospectisacomplex,elongated,highly sinuous,deeply incisedthatextendsfromNWtoSEanditissplit into three segments by NE-SW and E-W faults. Then, the channel was evaluated by studying the channel petrophysicalparameterstogetthenetto grossvalue(NTG)ofthereservoir andgetting thevalueoftheGIIPandrecoverableresourcesoftheinterested reservoir. X1Wellconsists of three pay zones from four sand packages while X2 Well that consists of one sand package. The GIIP value equal 2.1462*1010 (SCF), and the Recoverable Resources equal 15.0234*109(SCF). Channelmodelingwasdonetoidentify thechannelanditsinternal geometry byusingdifferenttechniquesofattributessuchasamplitude extraction, coherence,spectral decomposition techniqueandDirect HydrocarbonIndicatorssuch asbright,dimand flatspotareclarified within thechannelbytheanalysiswherethenorthwellisbrighterthanthesouth wellandthetwowells havegaswatercontact(flatspot)andthedimming problem within the channel is solved bythe modeling. Amplitude versus offsettechniquewasusedto evaluate the Pliocene channeltogetthe classtype usingRutherfordand Wiliam’s classificationthatisclass3increasing oftheamplitudewiththeoffsetinthe negativedirectionandby using EEI techniquethatdiscriminate betweenthe lithologyandthefluidwherethefluidangleequal45°andthelithologyis 90°.Theresultsofusing Extended Elastic Impendence (EEI) techniqueshowedthatEEIisworthyeffortto highlightthe differencebetweenreservoir andnon-reservoir toidentify hydrocarbonarea.