SY/T 6994-2020 in English

Core changes in the standard revision

Key technology implementation points

1. Optimization of mineral component calculation

The standard recommends three calculation methods: optimization method (6.1.2.1), element logging method (6.1.2.2) and regression fitting method (6.1.2.4). Element capture logging can accurately invert the content of siliceous minerals. Please note:

• The conversion coefficient between silicon content and quartz minerals needs to be calibrated by X-ray diffractometer
• Density correction is required when the pyrite content is ＞5%

2. Innovation in gas content calculation

The new standard introduces temperature-organic carbon dual correction (Formula 14-18) in the calculation of adsorbed gas. Key technical parameters:

Field application suggestions

Logging project combination strategy

According to Appendix A/B recommendations:

• Exploration wells: must include element capture logging + nuclear magnetic resonance
• Horizontal wells: azimuthal resistivity imaging is preferred instead of conventional resistivity

Quality verification process

Establish a three-level verification mechanism according to the requirements of Chapter 7:

1. Core analysis data comparison (error＞10% requires reprocessing)
2. Regional parameter regularity check
3. Geological model matching verification