Review on Mudstone Chemical Compaction(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2017年第06期
- Page:
- 761-772
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Review on Mudstone Chemical Compaction
- Author(s):
- LI Chao; LUO Xiao-rong
- 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China; 3.University of Chinese Academy of Sciences, Beijing 100049, China
- Keywords:
- chemical compaction; clay mineral; smectite-illite transition; structure change; load transfer; compaction curve; logging response
- PACS:
- P584
- DOI:
- -
- Abstract:
- Mudstone chemical compaction plays a very important role in the pore evolution, microstructure and formation of abnormal pressure, but there has been weak research on it so far. Recent research progresses about mudstone chemical compaction were systematically summarized, including action mechanism, mudstone texture changes, well logging interpretation and identification; finally, the key issues in mudstone chemical compaction were discussed. The results show that the chemical compaction mainly refers to smectite-illite transition, which is controlled by chemical kinetics and affected by temperature, time and mineral composition; it may be not obvious that the bulk volume expansion is caused by the conversion of interlayer water into intergranular water in clay mineral, and the chemical compaction may cause skeletal weakening and the effective stress transfer; the siliceous cementation and aligned clay mineral fabric significantly reduce the permeability of mudstone, and may obviously alter the mudstone compaction coefficient during clay diagenesis process; the smectite-illite transition causes the change of the relationship between effective stress and porosity of mudstone, and the logging response shows decreasing acoustic value and increasing density value; in addition, the mudstone chemical compaction shows higher speed ratio of longitudinal and transverse waves(Vp/Vs), and lower wave impedance and shear modulus. Some key problems in mudstone chemical compaction still need to be further studied, including the chemical compaction and the structure of clay mineral, the effect of organic matter on mudstone chemical compaction, the chemical compaction and characteristics of mudstone rheology, the difference between chemical undercompaction and compaction disequilibrium, and the prediction method of mudstone overpressure in the process of chemical diagenesis.
Last Update: 2017-12-15