Nano-pore characteristics and their geological control of the steeply inclined coal reservoir in the Cubey coalfield, the northern Tarim Basin [塔里木盆地北缘库拜煤田陡倾斜煤储层纳米孔隙特征及其地质控制]

作者：He X.; Li X.^*; Wei Y.; Tian J.; Ju Y.; Yang S.; Wang W.; Wu B.; Wang M.

来源：Chinese Journal of Geology(Scientia Geologica Sinica), 2021, 56(3): 740-757.

DOI：10.12017/dzkx.2021.037

• Adsorption pores
• Coal structure
• Coalbed methane
• Pore structure
• The Cubey coalfield

In recent years, the steeply inclined coal reservoir in Cubey coalfield, northern margin of Tarim Basin, Xinjiang, has become a new hot spot for CBM exploration and development in China, and some CBM wells have achieved high production. In this paper, 61 coal samples were collected from different depths and coal structure of steeply inclined coal reservoirs in Cubey coalfield. Through the experiments of coal rock composition and maturity, low temperature liquid nitrogen adsorption and isothermal adsorption, the characteristics of nano-pore structure and geological control of steeply inclined coal reservoirs were analyzed. The results shows that:Controlled by the heterogeneity of shear and compression strength in different parts of the piedmont thrust belt in South Tianshan, the nano-pore volume of steeply inclined reservoir in Cubey coalfield increases first and then decreases with the increase of depth; With the increase of coal failure degree, the nano-pore volume of coal rock increases and the complexity of pore structure tends to be complex; The deformation of coal body at the inversion position of steeply inclined reservoir is relatively enhanced, and the development degree of tectonic coal is relatively high. The nano-pore volume and specific surface area of coal rock increase accordingly, and the methane adsorption ability is strong and the gas content is good. Results of this work can provide instructions on CBM exploration and development of the steep inclined coal reservoir.

• 单位
  中国科学院大学