Fluid flow in the Duperow and Winnepegosis Formations,Williston Basin,Canada:Evidence from preliminary magnetic measurements

摘要

The Devonian Winnepegosis and Duperow Formations were examined in well 4-27-11-22W1,located in at the eastern edge of the Williston Basin in Manitoba.The variation in characteristic remanent magnetization(ChRM)direction and magnetic mineral carrier is obvious:the older Winnepegosis Formation has a primary or early post-depositional magnetization held in magnetite or pyrrhotite(n = 15;D=324.1 deg,I=-27.3 deg,alpha_(95)= 10.4 deg,k= 15.7),whereas the younger Duperow Formation magnetizations are carried by hematite and could be as late as Early Jurassic.The variability may be attributable to the intervening Prairie Evaporite acting as an aquitard to fluid migration.