: (2003)

21 2 2003 6 A CTA SED IM EN TOLO G ICA S IN ICA V o l. 21 N o. 2 Jun. 2003 : 100020550 (2003) 0220345205 1 2 1 3 1 ( 730000) 2 ( 730000) 3 ( 730020),, 1969 T E122. 1 A,,,,, 200,,,, (,, ) 1, 2,, ;,,,, ( ),, CH 4 CO 2 CO H 2S g ( ),,,,,, 1. 1,,,,,,,,,,, 1. 5 1. 0 0. 7 3 ( 1),,, 973 : 2002203225 : 2002208222 1

346 21 1 2 ( [ 3 ] ) ( [ 3 ] ) F ig. 1 Gas p roduction of m aceral in coal rock s F ig. 2 Gas p roduction of coal w ith different rank (modified from Ref. 3) in the m ain coal series of Ch ina (modified from Ref. 3) 1. 2,,,, (1000 100! ) (< 100! ),,, ( < 10% ),, ;,,, 80% 5, 6, ( 10 40m 2 g),, 2, 2, 4, ( ),,,, 10m 3 gt 7, ( ( ) ),,, 2 3 6, 8 ( ),,,,,,,,,, 5, 9, 2,, :, 268 393 m 3, > > ;,,,, >, >,, ;, 2,,,,,,,,,

2 : 347 ;,,,,,, 5, 7,, 10, 11,,,,,,,,,,,,, 5, 6, 9,,,,,, ;,,,,,, 1 10-3 Λm 2, 3 M Pa,, ;,, 6 M Pa,,,, 600 800 m 7,, 3,, ;,,, 12, 13, 3. 1,,,,, ;,,, :,,,,,, ;,,,, 3. 2, :,,, 4,, 5,,.., 1997, 8 (2) : 13 17

348 21 14 18 : :, ;, ;,,, : ( ),,, ( 5% ),, ;, 2 19 M Pa,, 10-5 10-6 Λm 2, 14, 15,,,,,,,,,,,,,, 0. 5 10-3 3. 16 10-3 Λm 2, 6,,,,,,,,, (References) 1,,. [M ]. :, 1987. 44 165 [ Pan Zhongxiang, Gao J iqing, Chen Rongshu. Petro leum Geo logy [M ]. Beijing: Geo logical Publish ing House, 1987. 44 165 ] 2. [M ]. :, 1994. 29 48, 189 206 [Xu Yongchang, et al. O rigin of N atural Gas: theo ry and app lication [M ]. Beijing: Science P ress, 1994. 29 48, 189 206 ] 3,. [J ]., 1988, 16 ( 3 ) : 31 37 [ Zhang W uji, L i X iaoyan. A nalysis of the hydrocarbon2p roducing po tential of m ain coal m easures source rock s in Ch ina [J ]. Coal Geo logy & Exp lo ration, 1988, 16 (3) : 31 37 ] 4,,. [M ]. :, 1992. 37 84 [ Fu J iamo, L iu D ehan, Sheng Guoying. Geochem istry of Coal2generated H ydrocarbons [M ]. Beijing: Science P ress, 1992. 37 84 ] 5,,. [M ]. :, 1991. 29 81 [ Zhang X inm ing, Zhang Suian, Zhong L ingw en, et al. Coalbed M ethane in China[M ]. X ian: Science and T echno logy P ress of Shaanxi, 1991, 29 81 ] 6,. [M ]. :, 1998. 8 37 [ Zhao Q ingbo, L iu B ing, et al. D evelopm ent of Coalbed M ethane Industry in the W o rld [M ]. Publish ing House, 1998. 8 37 ] Beijing: Geo logical 7. [J ]., 1996, 17 (1) : 80 84 [ Guan D esh i. Characteristics and enrichm ent of coalbed m ethane[j ]. X injiang Petro leum Geo logy, 1996, 17 (1) : 80 84 ] 8 Kuusk raa V A, B randenburg C F. energy[j ]. Coalbed m ethane spark s a new Industry: O il and Gas Journal, 1989, 87 (41) : 49 56 9. [ J ]., 1995, 15 (5) : 1 5[Q uan Yuke. P rim ary discussion on the facto rs affecting coalbed gas content[j ]. N atural Gas Industry, 1995, 15 (5) : 1 5 ] 10. [J ]., 1998, 10 (4) : 45 48 [ Gao Honglie. Review on coalbed gas and underground w ater [J ]. Coal Geo logy of Ch ina, 1998, 10 (4) : 45 48 ] 11,,. [J ]., 1999, 19 (4) : 23 25 [Zhou Zh icheng, W ang N ianxi, D uan Chunsheng. A ction of coalbed w ater in the exp lo ration and developm ent of coalbed gas [J ]. N atural Gas Industry, 1999, 19 (4) : 23 25 ] 12 L aw B E. T he Relationsh ip betw een coal rank and cleat spacing: Imp lications fo r the p rediction of perm eability in coal [ R ]. P roceedings of the 1993 International Coalbed M ethane Sympo sium, 1993. 435 441 13 C lo se J C. N atural F ractures in Coal. In: L aw B E, R ice D D, eds. H ydrocarbons from Coal: AA PG studies in Geo logy Series # 38. 1993. 119 130 14,. [M ]. :, 1999. 26 51, 81 93[Zhang J ianbo, W ang Hongyan. Favo rable A rea P rediction of Coalbed M ethane in the Q inshui basin, Shanxi P rovince [M ]. Xuzhou J iangsu: P ress of Ch ina U niversity of M ining and T echno logy, 1999. 26 51, 81 93 ]

2 : 349 15,,. [M ]. :, 1998. 74 106 [L iu H uanjie, Q in Yong, Sang Shuxun. Geo logy of Coalbed M ethane in Southern Shanxi, China [M ]. Xuzhou J iangsu: P ress of Ch ina U niversity of M ining and T echno logy, 1998. 74 106 ] 16, [M ]. :, 1999. 13 53 [ Zhao Q ingbo, et a l. Geo logy and Exp lo ration Techno logy of Coalbed M ethane[m ]. Beijing: Petro leum Industry Publish ing House, 1999. 13 53 ] 17,. [ J ]., 2000, 18 (4) : 611 614 [ Zhang J ianbo, Tao M ingxin, Geo logical significances of coalbed m ethane carbon iso tope in coalbed m ethane exp lo ration [ J ]. A cta Sedim ento logica Sinica, 2000, 18 (4) : 611 614 ] 18,,. [J ]., 2002, 30 (3) : 14 17 [ Gao Bo, T ao M ingxin, Zhang J ianbo, et al. D istribution characteristics and contro lling facto rs of 13 C1 value of coalbed m ethane [ J ]. Geo logy & Exp lo ration, 2002, 30 (3) : 14 17 ] Coal M a in Con troll ing Factors Ana lysis of Enr ichm en t Cond ition of Coa lbed M ethane GAO Bo 1 M A Yu2zhen 2 TAO M ing2x in 1 M A Gen2x i 3 1 (State Key laboratory of Gas Geochem istry, Lanzhou In stitute of Geology, Chinese Academy of Sc iences, Lanzhou 730000) 2 (College of Resources and Environment, Key Laboratory of W estern China s Environment System of Education M in istry, Lanzhou Un iversity, Lanzhou 730000) 3 (No. 2 Institute of Geology andm ineral Exploration, Gansu Bureau of Geology and M inerd Exploration and D evelopmen t, Lanzhou 730000) Abstract In th is paper, the au tho rs have analyzed the m ain con tro lling facto rs that affect en richm en t and h igh p roduct ion of coa lbed m ethane ( CBM ), such a s genera t ing and sto ring cap acity of coa l rock, perm eab ility of coal reservo ir and p reservation condition s of CBM. R esearch show s that m aceral and the degree of m etamo rph ism of coal rock are key facto rs that con tro l the generating and sto ring capacity of coal rock. T emperatu re, p ressu re and the con ten t of m ineral sub stance and w ater are also relevan t to the sto ring capacity of coal rock. How ever, the perm eab ility of coalbed is m ain ly con tro lled by fractu re system of coal rock, w h ich is relevan t to the m atu rity of coal and the in ten sity of tectogenesis. T he p reservation of CBM poo l is m ain ly con tro lled by the sealing capacity of roof and floo r p late, tecton ic activity and hydrodynam ic environm en ṫ Becau se of its impo rtan t ro le, w e d better strengthen the research on CBM poo l fo rm ing condition s. Key words coalbed m ethane, h igh p roduction, en richm en t, gas con ten t, perm eab ility, m aceral 2003 1 3, 85!