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Theoretical and Applicational Study on Numerical Focusing of Array Induction Logging

Author: YangChangPing
Tutor: XiaoJiaQi
School: Tianjin University
Course: Signal and Information Processing
Keywords: Array induction logging Geometric factor Resistivity Signal Focus Simulation
CLC: P631.811
Type: Master's thesis
Year: 2009
Downloads: 100
Quote: 2
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Abstract


As an important array induction logging resistivity logging method , the measured data is rich strata information . Use this information to synthesize a relatively high vertical resolution resistivity curves can be more effectively detect thin oil . Array induction logging instrument has seven sub- array data measured amount of information, how to use these data in this study high-resolution resistivity curve synthesis method . This paper first discusses the basic theory of array induction logging , analyzes the development of domestic and international array induction logging status . In the consolidated basis of previous studies on the application of electromagnetic theory analysis Doll, Gianzero, Moran, Born and other geometric factor theory . Geometric factor used Gianzero devised best focus filter. Focuses on the measurement signal array induction focus problems . In this process , the calculation of data to be processed and pathological slow quite conspicuous . This correlation function obtained using the various sub-array probe cross-correlation function and autocorrelation function, and then repeatedly used the calculated cross-correlation function and autocorrelation function to get the different morbid equations devised different depths really focus filter device , greatly reducing the data processing capacity. The original deal with each calculation requires about 400 trillion floating-point data , using the correlation function just after processing about 10 megabytes of data , greatly improves the operation efficiency . Using the Tikhonov regularization method for solving linear equations morbid , sick equations obtained optimal solution, ie the true initial focus filter. Conditions such as hard constraints by the true focus of the preliminary filter , to give a final true focus filter. Using the resultant filter can be synthesized different depths and different vertical resolution of logs . Also known as the true focus signal processing . In order to verify the effect of the filter , the paper also carried out simulation data . As the simulation model used Oklahoma formation model . Signal processing is complete, the true focus , reuse resolution matched filter synthesize different depths , the same vertical resolution resistivity logs . Simulation results show that the filter can achieve a true focus better results .

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Underground geophysical > Borehole measurements > Electrical logging
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