Geological and hydrological controls on the accumulation of coalbed methane within the No. 3 coal seam of the southern Qinshui Basin

被引:78
作者
Zhang, Junyan [1 ]
Liu, Dameng [1 ]
Cai, Yidong [1 ]
Pan, Zhejun [2 ]
Yao, Yanbin [1 ]
Wang, Yingjin [1 ]
机构
[1] China Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China
[2] CSIRO Earth Sci & Resource Engn, Private Bag 10, Clayton, Vic 3169, Australia
关键词
Coalbed methane; Gas accumulation; Hydrogeology; Qinshui Basin; Zhengzhuang block; POWDER RIVER-BASIN; SOUTHEASTERN ORDOS BASIN; SAN-JUAN BASIN; GAS CONTENT; FRUITLAND FORMATION; NORTH CHINA; NEW-MEXICO; WATERS; RESERVOIR; PRODUCIBILITY;
D O I
10.1016/j.coal.2017.09.008
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Since 2006, the Zhengzhuang (ZZ) block has been part of a commercial coalbed methane (CBM) production area in the southern Qinshui Basin, which has become one of the most productive CBM areas in China. However, hydrogeological study of the migration gas and groundwater of the ZZ block has not been systematically launched. This study focuses on geochemical analysis, including quality analysis and stable isotope analyses for the water from the CBM production wells, discusses the groundwater flow pathways and their influencing factors, and evaluates the geological and hydrological controls on gas accumulation in the study area. The results show that the produced waters produced with total dissolved solids (TDS) values of 152.8-5389.49 mg/L are typically fresh water and brackish water. The water type is primarily bicarbonate and the dissolved ions are effectively devoid of sulfate, calcium and magnesium. With the low desulfurization coefficients of 0.24-5.63, the hydrochemical condition is conductive to CBM preservation. The predominant flow of groundwater originates from the southwestern source, which flows to the north basin center and then shifts to the east deep graben due to the drastic structural variation. Four hydrodynamic zones were distinguished through the differences in hydrodynamic conditions. In the southwest Zone I and the central Zone II, the gas contents are relatively low (13.17-24.53 m(3)/t) despite the high thermal maturity (R-o,R-max = 3.31%-3.97%). However, the stagnant Zone III in the north and the deep stagnant Zone IV in the southeast show comparatively high gas content (16.5-31.44 m(3)/t). The complex geostructures act synergistically with the intense hydrodynamic activities for gas accumulation. Three CBM enrichment modes were distinguished: hydrodynamic trapping at structure lows with high hydrostatic pressure; conventional trap of impermeable boundary; and hydraulic flushing and gas loss through the fault. These investigations may serve for CBM exploration and development in the study area.
引用
收藏
页码:94 / 111
页数:18
相关论文
共 55 条
[1]   Geologic controls on transgressive-regressive cycles in the upper pictured cliffs sandstone and coal geometry in the lower Fruitland Formation, Northern San Juan Basin, New Mexico and Colorado [J].
Ambrose, William A. ;
Ayers, Walter B., Jr. .
AAPG BULLETIN, 2007, 91 (08) :1099-1122
[2]  
[Anonymous], MARK TRENDS COAL EN
[3]  
[Anonymous], US COALB METH PROD
[4]  
[Anonymous], 2001, COAL GEOLOGY EXPLORA
[5]  
Ayers WB, 2002, AAPG BULL, V86, P1853
[6]   Possible controls of hydrogeological and stress regimes on the producibility Of coalbed methane in Upper Cretaceous - Tertiary strata of the Alberta basin, Canada [J].
Bachu, S ;
Michael, K .
AAPG BULLETIN, 2003, 87 (11) :1729-1754
[7]   THE OCCURRENCE AND ORIGIN OF METHANE IN SOME GROUNDWATER-FLOW SYSTEMS [J].
BARKER, JF ;
FRITZ, P .
CANADIAN JOURNAL OF EARTH SCIENCES, 1981, 18 (12) :1802-1816
[8]  
Brinck E.L., 2008, Environmental geosciences, V15, P153, DOI DOI 10.1306/EG.01290807017
[9]   Preliminary evaluation of gas content of the No. 2 coal seam in the Yanchuannan area, southeast Ordos basin, China [J].
Cai, Yidong ;
Liu, Dameng ;
Zhang, Keming ;
Elsworth, Derek ;
Yao, Yanbin ;
Tang, Dazhen .
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING, 2014, 122 :675-689
[10]   Geological controls on prediction of coalbed methane of No. 3 coal seam in Southern Qinshui Basin, North China [J].
Cai, Yidong ;
Liu, Dameng ;
Yao, Yanbin ;
Li, Jungian ;
Qiu, Yongkai .
INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2011, 88 (2-3) :101-112