Title :
Application of wavelets in estimating dip angles and conductivities of Earth formation
Author :
Goswami, J.C. ; Heliot, D. ; Tabanou, J. ; Morriss, C.
Author_Institution :
Schlumberger Technol. Corp., Sugar Land, TX, USA
Abstract :
Earth formations can be modeled as a layered medium with each layer having its own dip angle and conductivity. In a typical exploration environment, a wellbore (about 15 to 30 cms in diameter) is drilled to a depth that may extend to a few kilometers. Formation properties are measured using a sensor that moves along the wellbore trajectory. The sensor is remotely controlled from the surface. Formation resistivity is an important property, which is measured by a sensor consisting of several transmitters and receivers and operating at a frequency of a few MHz. Estimating dip angles provides valuable information in positioning the wellbore trajectory. We present a novel method for estimating dip angles and formation properties using a wavelet-based processing of well log data in conjunction with an inversion method.
Keywords :
Earth structure; electric sensing devices; electrical conductivity; electrical resistivity; geophysical prospecting; geophysical signal processing; inhomogeneous media; parameter estimation; wavelet transforms; Earth formation properties; conductivity; dip angles; formation resistivity; layered medium; sensor; wavelets; well log data; wellbore trajectory; Collision mitigation; Conductivity; Earth; Electronics packaging; Feature extraction; Filters; Frequency; Geophysical measurements; Image sensors; Mirrors;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2003. IEEE
Conference_Location :
Columbus, OH, USA
Print_ISBN :
0-7803-7846-6
DOI :
10.1109/APS.2003.1217472