238000004141 dimensional analysis Methods 0.000 description 1.238000007796 conventional method Methods 0.000 description 1.238000004364 calculation method Methods 0.000 description 1.230000005540 biological transmission Effects 0.000 description 1.229910052500 inorganic mineral Inorganic materials 0.000 description 2.150000002430 hydrocarbons Chemical class 0.000 description 2.230000005358 geomagnetic field Effects 0.000 description 2.238000004458 analytical method Methods 0.000 description 4.230000005684 electric field Effects 0.000 abstract description 30.230000005284 excitation Effects 0.000 claims description 2.238000005259 measurement Methods 0.000 claims abstract description 45.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to US06/636,232 priority Critical patent/US4591791A/en Priority to US06/854,147 priority patent/US4757262A/en Application filed by University of Texas System filed Critical University of Texas System Priority to US07/181,973 priority patent/US4835473A/en Application granted granted Critical Publication of US4835473A publication Critical patent/US4835473A/en Anticipated expiration legal-status Critical Status Expired - Fee Related legal-status Critical Current Links Original Assignee University of Texas System Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US07/181,973 Inventor Francis X.
source for determining resistivity distribution of the earth as a function of depthÄownload PDF Info Publication number US4835473A US4835473A US07/181,973 US18197388A US4835473A US 4835473 A US4835473 A US 4835473A US 18197388 A US18197388 A US 18197388A US 4835473 A US4835473 A US 4835473A Authority US United States Prior art keywords earth survey line survey electric source Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. source for determining resistivity distribution of the earth as a function of depth
Google Patents US4835473A - Method using a d.c.