METHOD OF DETERMINING CHANGE IN SUBSURFACE STRUCTURE DUE TO APPLICATION OF FLUID PRESSURE TO THE EARTH

摘要

ABSTRACT OF THE DISCLOSUREThis invention relates to a method of determinationof the change in subsurface structure of the earthresulting from the application of fluid pressure at aselected point, at a selected depth, in the earth, bymeasuring at least one physical paramemter of thecontour of the subsurface of the earth above the pointof application of fluid pressure. The method involvespositioning a plurality of tiltmeters on the earth abovethe point of application of fluid pressure arranged ina known array, and measuring the change in angle oftilt of the earth's surface at the point of placementof each sensor while varying the pressure and flowrate of fluid into the earth at the selected point.