A fast algorithm for three-dimensional interpretations ofsingle-well electromagnetic data

Tseng, Hung-Wen ; Lee, Ki Ha

Lawrence Berkeley National Laboratory

关键词: Oil Fields;    58;    Computers;    Born Approximation;    Induction Logging;   

DOI  :  10.2172/929036
RP-ID  :  LBNL--55549
RP-ID  :  DE-AC02-05CH11231
RP-ID  :  929036

美国|英语

来源: UNT Digital Library

【 摘 要 】

An efficient inversion algorithm has been developed forthree-dimensional (3D) interpretations for single-hole electromagnetic(EM) logging data based on a modified extended Born approximation (MEBA)scheme. The single-hole data was collected at an oil field undergoing CO2injection in southern California using a tool, Geo-BILT, developed byElectromagnetic Instruments, Inc (EMI). The tool is equipped with amulti-component source, and an array of multi-component receivers atdifferent separations. The inversion result provides a reasonableelectrical conductivity image to a distance of 10 m from the well, andillustrates several zones with lateral conductivity variations that couldnot be resolved with traditional induction logging tools. The computercost of the inversion processes can be further reduced using a trivialmulti-grid methodology.