Table 1. Physical and Petrographic Properties of No. 3 Coal Reservoir in the Three CBM Blocks^a.

parameters		Fanzhuang block	Zhengzhuang block	Changzhi block
physical properties	buried depth (m)	425–746/575	626–1260/886	529–1340/917
	thickness (m)	5.89–7.76/6.47	3.97–7.03/5.69	2.9–8.1/5.83
	gas content (cm3/g)	11.15–22.14/19.47	7.65–31.44/21.33	4.55–23.42/14.43
	porosity (%)	4.16–22.09/14.48	3.33–31.44/8.00	1.32–10.06/4.16
	fracture density (strip/cm)	3.39–7.30/4.76	4.43–10.90/6.48	2.30–13.00/5.93
petrographic properties	moisture (%)	0.98–2.25/1.43	0.74–1.91/1.24	0.51–1.60/0.87
	ash (%)	11.42–22.05/14.33	9.79–21.63/12.14	5.73–37.59/16.86
	organic component (%)	90.8–96.6/94.8	86.3–97.4/94.7	58.2–99.1/92.7
	vitrinite (%)	54.2–85.5/72.5	53.6–89.2/70.5	37.4–90.6/72.4
	inertinite (%)	14.5–45.8/27.5	10.8–46.4/29.5	9.4–63.6/27.6
	vitrinite reflectance (%)	3.33–4.08/3.60	2.95–4.44/3.68	1.96–2.62/2.38

^aThe values are presented as “minimum–maximum/average”.