?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=https%3A%2F%2Fepisodesplatform.eu%2Feprints%2F2170%2F&rft.title=Cotton+Valley+Imaging+Project%0D%0APhase+IV%0D%0ACompletion+of+Microseismic+Mapping%0D%0Aof+the%0D%0APhase+I+and+II+Hydraulic+Fractures%0D%0AWells+CGU21-10+and+CGU21-09&rft.creator=Rutledge%2C+James+T.&rft.creator=Urbancic%2C+Ted&rft.subject=Other-additional+study&rft.subject=Cotton+Valley&rft.subject=Unconventional+hydrocarbon+extraction&rft.description=Microseismic+monitoring+was+conducted+for+three+stages+of+hydraulic+fracture+completions+of%0D%0Awells+CGU21-10+(Phase+1)+and+CGU21-09+(Phase+2)+in+May+and+July%2C+1997%2C+respectively.%0D%0AARCO+wrote+two+reports+summarizing+the+acquisition+and+field+analysis+of+the+Phase-1+and+-2%0D%0Amicroseismic+data+(Withers+and+Dart%2C+1997a%3B+Withers+and+Dart%2C+1997b).+The+Phase+1+preliminary%0D%0Amapping+results+of+ARCO+were+also+presented+in+Walker+(1997).%0D%0AARCO+mapped+subsets+of+the+data+collected+in+the+field+using+their+process+of+visually+matching%0D%0Acalculated+wavefront+curves+with+full-array+waveform+displays.+Based+on+an+operator+moving+a%0D%0Agraphical+display+of+a+trial+event+location%2C+a+single+event%E2%80%99s+final+location+is+stored+when+the%0D%0Aoperator+finds+an+acceptable+match+of+the+corresponding+display+of+computed+and+observed%0D%0Aarrival+times.+Los+Alamos%2C+The+Engineering+Seismology+Group+Canada+(ESG)%2C+and+Sandia+each%0D%0Aseparately+mapped+different+subsets+of+the+Phase-1+data+and+presented+preliminary+results+at+the%0D%0ADecember%2C+1997+meeting+of+the+Cotton+Valley+Imaging+Consortia.+The+ESG+analysis+also+include%0D%0Acharacterization+of+the+microearthquake+source+parameters+(Urbancic+and+Zinno%2C+1998).+At+the%0D%0Asame+meeting%2C+ARCO+presented+their+mapping+results+of+the+Phase-2+data.+A+number+of%0D%0Aproblems+or+discrepancy+were+identified+that+warranted+a+more+thorough+investigation+of+the+data%0D%0Aand+the+various+mapping+techniques+employed.+After+two+preliminary+studies+investigating+the%0D%0Aasymmetry+of+fracture+growth+of+the+Phase-1%2C+Stage-2+treatment+(Rutledge%2C+1998)+and+a+reevaluation+of+the+single-well+locations+of+the+Phase-2+data+(Urbancic%2C+1998)%2C+the+Cotton+Valley%0D%0AConsortia%2C+under+GRI+management%2C+funded+both+Los+Alamos+and+ESG+to+complete+the%0D%0Amicroseismic+mapping+and+analysis+of+source+parameters+for+the+entire+Phase-1+and+-2+data+sets.%0D%0AThese+efforts+constitute+Phase+IV+of+the+Cotton+Valley+Imaging+Project+and+include+the+following%0D%0Atasks%3A%0D%0A1.+Calculation+of+event+locations+using+inversion+techniques+for+the+Phase+1+and+2%0D%0Ahydraulic+fractures+(over+and+above+previously+located+events).%0D%0A2.+Determination+of+source+parameters+for+the+above+located+events.%0D%0A3.+Confirmation+of+results+through+joint+analysis+of+data+subsets.%0D%0A4.+Evaluation+of+velocity+and+array+geometry+effects+on+event+location+and+source%0D%0Aparameter+determinations.%0D%0A5.+Visualization+of+results+and+associated+location+errors.%0D%0APart+I+of+this+report+covers+the+microearthquake+location+analysis+and+involves+tasks+1%2C+3%2C+4%2C+and%0D%0A5%3B+Part+II+covers+the+analysis+of+source+parameters+and+involves+tasks+2%2C+3%2C+4+and+5.&rft.publisher=Gas+Research+Institute&rft.date=1999-11&rft.type=Reports&rft.type=NonPeerReviewed&rft.format=text&rft.language=en&rft.identifier=https%3A%2F%2Fepisodesplatform.eu%2Feprints%2F2170%2F1%2F14.pdf&rft.identifier=++Rutledge%2C+James+T.+and+Urbancic%2C+Ted++(1999)+Cotton+Valley+Imaging+Project+Phase+IV+Completion+of+Microseismic+Mapping+of+the+Phase+I+and+II+Hydraulic+Fractures+Wells+CGU21-10+and+CGU21-09.++Technical+Report.+Gas+Research+Institute.+++++