Abstract
The low rank coalbed methane (CBM) has great potential for exploration and development in China, but its exploitation level is low at present stage. The pores are the storage space of CBM, so recognizing its structural characteristics has very important practical significance for the development of CBM. The samples of No. 4 and upper No. 4 coalbed in Dafosi were selected to carry out the analysis of mercury injection test, nitrogen adsorption test and scanning electron microscopy to study the different lithotypes of the pore structure, pore throat distribution and fracture character of low rank coal reservoir. The results showed that micropore of low rank coal in Dafosi relatively developed and the pore volume of vitrain was equivalent to durain. The pore throat of durain was larger than vitrain, the connectivity was better and the fissures were more developed. The percolation capacity and reservoir performance of upper No. 4 coal was better than No. 4 coal. Generally, the potential of exploration and development of upper No. 4 coal in the study area was better than that of No. 4, and the developed area of durain was more beneficial for the development of CBM.
Highlights
The coalbed methane (CBM)’s exploration and development degree of low rank coal area is low in China, only achieving preliminary development in the mining of Xinjiang Fukang, Shaanxi Binchang etc. [1] [2]
The samples of No 4 and upper No 4 coalbed in Dafosi were selected to carry out the analysis of mercury injection test, nitrogen adsorption test and scanning electron microscopy to study the different lithotypes of the pore structure, pore throat distribution and fracture character of low rank coal reservoir
The results showed that micropore of low rank coal in Dafosi relatively developed and the pore volume of vitrain was equivalent to durain
Summary
The CBM’s exploration and development degree of low rank coal area is low in China, only achieving preliminary development in the mining of Xinjiang Fukang, Shaanxi Binchang etc. [1] [2]. DFS-C02 in Dafosi mine field has exceeded 3 × 104 m3, which reflects the exploration and development potential of CBM of low rank coal in Jurassic. Scholars have done a lot of researches on the characteristics of coal pore and its influence on characteristics of CBM gas production. Song X.X. et al [9] studied pore characteristics of different types of tectonic coals by using small angle X-ray scattering and low temperature nitrogen adsorption experiments. Ma D.M. et al [10] carried on the contrast research to the powder coal of Shanyang coal field and the original structure coal on pore characteristic. The pore structure, pore type and fracture characteristics of different lithotypes in low rank coal reservoirs were analyzed, which provided the basis for the development of CBM in later stage
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call