Research on lithology and mudcake correction method based on X-ray density logging measurement

Area of Science:

• Petroleum Engineering
• Geophysical Well Logging
• Nuclear Logging

Background:

• X-ray density logging is crucial for the petroleum industry.
• X-ray density logging is susceptible to mudcake and lithology variations, unlike traditional methods.

Purpose of the Study:

• To analyze the influence of lithology and mudcake on X-ray density logging.
• To develop correction methods for lithology and mudcake effects in X-ray density logging.

Main Methods:

• Monte Carlo simulation was employed to model the physical processes.
• Analysis of spectral data and development of compensation algorithms were performed.

Main Results:

• Lithology significantly impacts the entire energy spectrum, making single energy window corrections ineffective.
• Combining high and low energy windows effectively minimizes lithology influence for accurate density.
• Mudcake effects differ from traditional logging, requiring zone-specific compensation formulas.

Conclusions:

• Accurate X-ray density logging requires addressing both lithology and mudcake influences.
• The proposed methods offer theoretical guidance for processing X-ray density logging data.
• This research supports the sustainable development of the petroleum industry through improved logging accuracy.