Tectonic evolution and reservoir formation of coalbed methane in Zhengzhuang block of Qinshui basin
Abstract：Based on the structural characteristics of Zhengzhuang area in Qinshui basin, this ar- ticle studies the tectonic stress field evolution of Zhengzhuang area and analyzes its role in con- trolling coal bed methane （CBM） reservoir including tectonic-burial history, late accumulation evolution and formation control factors. The research shows that Zhengzhuang area went through four periods of tectonic stress field including Indo-Chinese, Yanshan, Early Himalayan and Late Himalayan period. Under structure control, Permian coals twice went through hydro- carbon generation in the Indo-Chinese and Middle-late Yanshan periods, Middle-late Yanshan period was the main CBM reservoir evolution period with a huge amount of CBM. Since then, with continued crust uplifting and erosion, the burial depth of coal seams gradually shoaled and several groups joined to form good sealing properties. The CBM reservoir in Permian coals is the most shallow with coal seams depth of 600--1 200 m since it was controlled by Sitou fault. Although the Permian CBM reservoir is the earlier, the CBM content is abundant, and the coal reservoir is thick with appropriate burial depth.
Keywords：structural featureevolution of tectonic stress fieldcoal-bed methanePermian
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 425-431 )