Electrical imaging logging fractal dimension based volcanic lithological character identification method

Abstract

The invention discloses an electrical imaging logging fractal dimension based volcanic lithological character identification method. The method mainly includes five parts including importing cored interval imaging logging data, performing logging data filtering and signal enhancement, performing threshold segmentation and skeleton information extraction, determining fractal dimension range of different lithological characters and performing fractal dimension calculation of an uncored interval, and importing uncored interval imaging logging data and performing fractal dimension calculation forlithological character identification. According to the invention, through data treatment, fractal dimension calculation and the like of electrical imaging logging, automatic identification of lithological characters of the uncored interval can be realized. Uncertainty caused by a traditional naked eye observation method is eliminated to a certain degree and lithological character identification precision and rate are improved. At the same time, the invention also brings new ideas for logging identification of rocks of other types.

Description

technical field [0001] The invention belongs to the fields of geophysical well logging and geological exploration, and in particular relates to a method for identifying volcanic rock lithology based on the fractal dimension of electrical imaging well logging. Background technique [0002] Lithology identification of volcanic rocks is an important basis for logging evaluation of volcanic rock reservoirs and exploration of oil and gas resources. However, affected by many factors, volcanic rocks have strong heterogeneity, which makes their logging response characteristics very complex and extremely difficult to identify. [0003] Based on the crossplot analysis of conventional well logging data and the calculation of fractal dimension of conventional well logging data, many beneficial explorations have been made on the lithology identification of volcanic rocks, and some results have been obtained. Restricted by the vertical resolution of conventional logging, their identifica...

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Problems solved by technology

[0004] However, the existing methods and ideas are to establish typical electrical imaging logging information databases of different lithologies through simple visual identification methods, and use qualitative methods to judge lithology, which has low precision, strong subjectivity, and is very difficult. time consuming

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