Oil & Gas Geology ›› 2024, Vol. 45 ›› Issue (6): 1511-1523.doi: 10.11743/ogg20240601
• Academician Forum • Previous Articles Next Articles
Xusheng GUO1,2,3,4,5(), Peirong ZHAO2,3,4,5, Baojian SHEN2,3,4,5, Zengqin LIU2,3,4,5(), Bing LUO2,3,4,5,6, Shihu ZHAO2,3,4,5, Jiaqi ZHANG2,3,4,5, Jiayuan HE2,3,4,5, Weishu FU2,3,4,5, Haipeng WEI1, Jiong LIU2,3,4,5, Xinjun CHEN2,3,4,5, Jincheng YE2,3,4,5
Received:
2024-05-07
Revised:
2024-10-26
Online:
2024-12-30
Published:
2024-12-31
Contact:
Zengqin LIU
E-mail:guoxs.syky@sinopec.com;liuzengqin.syky@sinopec.com
CLC Number:
Xusheng GUO, Peirong ZHAO, Baojian SHEN, Zengqin LIU, Bing LUO, Shihu ZHAO, Jiaqi ZHANG, Jiayuan HE, Weishu FU, Haipeng WEI, Jiong LIU, Xinjun CHEN, Jincheng YE. Geological features and exploration practices of deep coalbed methane in China[J]. Oil & Gas Geology, 2024, 45(6): 1511-1523.
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Table 1
Current situation of deep CBM production in typical wells in major countries worldwide"
国家 | 盆地 | 主要目的层系 | 典型井生产情况 |
---|---|---|---|
中国 | 鄂尔多斯盆地 | 石炭系-二叠系 | 延川南区块Y3-P11井,埋深1 140 m,峰值日产气量6.7×104 m3 |
大吉区块JS6-7P01井,埋深2 200 m,峰值日产气量10.1×104 m3 | |||
榆林地区NL1H井,埋深3 222 m,峰值日产气量5.4×104 m3 | |||
大牛地区块YM1HF井,埋深2 880 m,峰值日产气量10.4×104 m3 | |||
四川盆地 | 二叠系 | 南川区块Y2井,埋深1 976 m,峰值日产气量1.8×104 m3 | |
准噶尔盆地 | 侏罗系 | 五彩湾地区CT1H井,埋深2 385 m,峰值日产气量5.7×104 m3 | |
美国 | 皮申思盆地 | 白垩系 | 以Williams Fork组煤层为目标的65口单井,埋深约2 560 m,井均日产气量1.1×104 m3 |
澳大利亚 | 库珀盆地 | 二叠系 | Rosewell-1井,埋深3 068 m,峰值日产气量2.8×104 m3 |
Table 2
Comparison of typical exploration areas with moderate to deep CBM in terms of geological and engineering characteristics, Ordos Basin"
样品 来源 | 煤层 | 延川南山西组2#煤层 | 大吉太原组8#煤层[ | 大牛地气田太原组8#煤层 |
---|---|---|---|---|
埋深/m | 800 ~ 1 500 | 1 500~2 500 | 2 500 ~ 3 000 | |
煤岩 煤质 | 煤岩类型 | 半亮煤为主 | 光亮煤-半亮煤为主 | 光亮煤-半亮煤为主 |
演化程度(Ro)/% | 2.45 | 2.70 | 1.50 | |
灰分产率/% | 13.60 | 11.70 | 17.86 | |
镜质组含量/% | 66.70 | 85.50 | 68.05 | |
储集性 | 煤层厚度/m | 3.3 ~ 6.5,平均4.7 | 4.0 ~ 12.0,平均7.8 | 5.0 ~ 16.0,平均9.4 |
裂隙线密度/(条/cm) | 0.8 ~ 5.0(面割理) | 1.2 ~ 2.0(面割理) | 0.6 ~ 1.0(面割理) | |
孔隙度/% | 4.00 | 3.13 | 4.68 | |
渗透率/(10-3 μm2) | 0.010 0 ~ 0.990 0 (注入/压降试井) | 0.053 0 ~ 0.054 0 (注入/压降试井) | 0.000 1 ~ 0.760 0 (气体法) | |
保存性 | 压力系数 | 平均0.790 | 0.902 ~ 0.936 | 平均1.030 |
顶板岩性 | 泥岩 | 灰岩 | 灰岩 | |
构造复杂程度 | 以单斜为主,断裂较发育 | 以单斜为主,断裂较发育 | 以单斜为主,断裂欠发育 | |
地层水矿化度(mg/L) | 3 000 ~ 80 000 | 72 029 ~ 223 378 | 70 258 ~ 153 239 | |
含气性 | 总含气量/(m3/t) | 8.0 ~ 21.0 | 18.0 ~ 26.0 | 16.5 ~ 26.0 |
吸附气饱和度/% | 41.48 ~ 92.19 | 97.99 ~ 100.00 | 100.00 | |
游离气占比/% | — | 平均值20 | 20 ~ 50 | |
可压性 | 煤体结构 | 原生-碎裂结构为主 | 原生结构为主 | 原生结构为主 |
垂向应力差/MPa | 2 ~ 6 | 11 ~ 31 | 7 ~ 16 | |
水平应力差异系数 | 0.10 | 0.13 | 0.15 | |
勘探 实例 | 典型井 | Y3-P11井 | JS6-7P01 井 | YM1HF井 |
钻完井关键参数 | 水平段长度1 453 m,排量18 ~ 22 m3/min,产砂量3 067 m3, 产液量31 596 m3 | 水平段长度1 000 m,排量16 ~ 18 m3/min,产砂量3 823 m3, 产液量31 892 m3 | 水平段长度1 030 m,排量15 ~ 22 m3/min,产砂量6 620 m3, 产液量54 589 m3 | |
生产特征 | 产气量峰值5×104 m3/d,年产气量> 1 000×104 m3,EUR>3 000×104 m3 | 产气量峰值10.1×104 m3/d,年产气量> 1 800×104 m3,EUR>5 500×104 m3 | 产气量峰值10.4×104 m3/d,年产气量> 2 300×104 m3,EUR>6 000×104 m3 |
Table 3
Index system for geology-engineering integrated selection of deep CBM target areas"
选区分类 | Ⅰ类区 | Ⅱ类区 | Ⅲ类区 | |
---|---|---|---|---|
煤岩煤质 | 煤岩类型 | 光亮煤-半亮煤 | 半亮煤-半暗煤 | 半暗煤-暗淡煤 |
演化程度(Ro)/% | ≥0.7 | 0.5 ~ 0.7 | <0.5 | |
灰分产率/% | ≤20 | 20 ~ 40 | >40 | |
镜质组含量/% | ≥60 | 40 ~ 60 | <40 | |
储集性 | 煤层厚度/m | 单层厚度≥4 | 单层厚度2 ~ 4 | 单层厚度<2 |
孔隙度/% | ≥4 | 2 ~ 4 | <2 | |
裂隙线密度/(条/cm) | ≥0.6 | 0.2 ~ 0.6 | <0.2 | |
保存性 | 压力系数/% | ≥0.8 | 0.6 ~ 0.8 | <0.6 |
顶板厚度/m | ≥6(灰岩或泥岩) | 2 ~ 6(灰岩或泥岩) | <2(灰岩或泥岩) | |
构造复杂程度 | 构造稳定区 | 构造较稳定区 | 构造复杂区 | |
水动力条件 | 滞留区 | 弱径流区 | 强径流区 | |
含气性 | 总含气量/(m3/t) | ≥12 | 4 ~ 12 | <4 |
游离气占比/% | ≥20 | 10 ~ 20 | <10 | |
可压性 | 煤体结构 | 原生结构 | 碎裂-碎粒结构 | 糜棱结构 |
地应力/MPa | ≤80 | 80 ~ 100 | >100 | |
垂向应力差/MPa | ≥8 | 4 ~ 8 | <4 | |
水平应力差异系数 | ≤0.2 | 0.2 ~ 0.3 | >0.3 |
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