?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=https%3A%2F%2Fepisodesplatform.eu%2Feprints%2F2165%2F&rft.title=Analyses+of+the+Cotton+Valley+Microseismic+Data+for+AsymmetricFracture+Growth&rft.creator=Rutledge%2C+James+T.&rft.subject=Other-additional+study&rft.subject=Cotton+Valley&rft.subject=Unconventional+hydrocarbon+extraction&rft.description=I+have+examined+the+entire+Stage+2+microseismic+data+set+for+source+location%2C+detection+range%2C+andmagnitude+distribution+to+determine+what+information+regarding+fracture+growth+asymmetry+canbe+obtained+from+the+distribution+of+seismicity.A+conservative+estimate+of+wing+lengths+based+on+event+locations+of+higher+quality+data+are925+ft%C2%B120+ft+east+and+845%C2%B125+ft+west+of+the+treatment+well+at+injection+depth%2C+or+12%25longer+to+the+east.Location+uncertainty+for+a+set+of+low-magnitude+events+detected+near+the+eastern+terminusof+the+seismicity+are+actually+larger+than+the+western-most+locations+because+they+occurnear+the+plane+of+the+2+monitor+wells+where+location+errors+are+inherently+large.+Based+onthese+low-magnitude+events%2C+a+more+liberal+estimate+of+the+eastern+extent+of+seismicity+is1065%C2%B1100+ft%2C+or+21%25+longer+to+the+east.An+examination+of+P-+and+S-wave+detection+ranges+indicate+that+the+larger+magnitudeevents+observed+during+the+treatment+could+have+been+detected+and+the+mapped+had+theyalso+occurred+beyond+the+western+terminus+of+mapped+seismicity.+However%2C+the+closest200+ft+of+the+eastern+wing+terminus+is+populated+by+only+small+magnitude+events.+Had+asimilar+set+of+low-magnitude+events+extended+200+ft+beyond+the+western+terminus+ofmapped+seismicity%2C+they+would+have+produced+no+detectable+P-waves+and+only+marginallydetectable+S-waves+on+the+near-treatment-zone+receivers.+Even+if+recognized%2C+such+eventswould+have+been+unmappable+with+the+working+arrays+deployed.+Therefore%2C+symmetricfracture+growth%2C+in+both+length+and+release+of+seismic+energy%2C+would+result+in+the+seismicobservations+obtained.+Although+a+definitive+result+cannot+be+obtained+from+a+lack+ofobservations%2C+I+conclude+that+it+is+most+reasonable+to+assume+symmetric+fracture+growthbased+on+the+source+locations%2C+detection+range%2C+and+magnitude+distribution+observed.&rft.publisher=Gas+Research+Institute&rft.date=1998-07&rft.type=Reports&rft.type=NonPeerReviewed&rft.format=text&rft.language=en&rft.identifier=https%3A%2F%2Fepisodesplatform.eu%2Feprints%2F2165%2F1%2F8.pdf&rft.identifier=++Rutledge%2C+James+T.++(1998)+Analyses+of+the+Cotton+Valley+Microseismic+Data+for+AsymmetricFracture+Growth.++Technical+Report.+Gas+Research+Institute.+++++