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An inversion method for calculating formation and borehole parameters in X-ray lithology density logging
Hua-Wei Yu1, Qian Zhu2, Hu Wang3
1National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, 266580, China; School of Geosciences, China University of Petroleum (East China), Qingdao, 266580, China.
Summary
This study introduces an inversion method for X-ray lithology density logging, improving formation density and lithology index accuracy by reducing borehole environment effects.
Area of Science:
- Geophysics
- Nuclear Logging
- Petroleum Engineering
Background:
- Traditional lithology density logging uses Cesium-137 sources.
- X-ray sources are emerging as a new trend in nuclear logging.
- Mudcake and drilling fluids significantly affect measurement accuracy.
Purpose of the Study:
- To present an inversion method for X-ray lithology density logging.
- To reduce mudcake effects and enhance measurement accuracy.
- To accurately calculate formation and borehole parameters.
Main Methods:
- Derived a response model for broad-beam attenuation in X-ray logging.
- Utilized Monte Carlo simulations to study detector responses.
- Employed the Levenberg-Marquardt (LM) algorithm for iterative inversion.
Main Results:
- Developed a forward modeling-based inversion method.
- Successfully reduced the influence of the borehole environment.
- Improved accuracy in measuring formation density and lithology index.
Conclusions:
- The proposed inversion method enhances X-ray lithology density logging accuracy.
- It effectively overcomes limitations of traditional data processing techniques.
- This method offers a more reliable approach for formation evaluation.
