Oil & Gas Geology ›› 2024, Vol. 45 ›› Issue (6): 1537-1554.doi: 10.11743/ogg20240603
• Petroleum Geology • Previous Articles Next Articles
Yong LI1,2(), Tao GUO3,4, Xinyan LIU2, Suping PENG1
Received:
2024-06-19
Revised:
2024-10-14
Online:
2024-12-30
Published:
2024-12-31
CLC Number:
Yong LI, Tao GUO, Xinyan LIU, Suping PENG. Resource potential and exploration targets of low-rank coalbed methane in China[J]. Oil & Gas Geology, 2024, 45(6): 1537-1554.
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Table 1
Coal grades and gas contents of main gas-bearing regions in northwestern and northeastern China (some regions bearing middle-rank coal seams)"
聚气带 | 含气区 | 含煤地层 | 煤级 | 含气量/(m3/t) | 甲烷浓度/% | 含气饱和度/% |
---|---|---|---|---|---|---|
准噶尔盆地 | 准南 | J1-2 | CY-FM | 6.20 | 85~90 | 55 |
准东 | J1-2 | HM-QM | 4.00 | 90 | 30 | |
准北 | J1-2 | HM-QM | 6.00 | 92 | 78 | |
白家海 | J1-2 | CY-FM,FM | 14.00 | — | >100 | |
天山 | 伊犁 | J1-2 | CY-QM | 3.80 | <80 | 62~85 |
尤尔都斯 | J1-2 | CY-QM | 6.50 | <93 | 62~85 | |
焉耆 | J1-2 | QM | 6.10 | <80 | 62~85 | |
库米什 | J1-2 | CY-QM | 6.00 | <80 | 62~85 | |
塔里木盆地 | 南缘 | J1-2 | QM-SM | 4.00 | — | — |
北缘 | J1-2 | CY-JM | 4.00 | 70~80 | — | |
吐哈盆地 | 吐哈 | J1-2 | HM,CY,QM | 4.00 | 85~90 | 75 |
三塘湖盆地 | 三塘湖 | J1-2 | CY-QM | 4.32 | 80 | 78 |
柴达木盆地 | 柴北缘 | J2-3 | CY-PM | 3.00 | 85 | 70 |
河西走廊 | 祁连山 | C2,J2 | CY-JM | 5.00 | <80 | 33~62 |
山丹 | C2,J2 | QM-JM | 4.00 | <80 | 37~48 | |
景泰 | C2 | SM | 5.00 | 85 | 41 | |
靖远 | C2,J2 | CY-QM | 6.00 | 85 | 54~75 | |
西宁 | J2 | CY-SM | 8.00 | 90 | 62~69 | |
窑街 | J2 | CY,QM | 5.00 | 85 | 45~53 | |
阿干镇 | J2 | CY | 6.00 | 90 | 62~69 | |
中卫 | C2,J3,P1 | QM-WY | 7.00 | 90 | 50~66 | |
二连盆地 | 吉尔嘎朗图 | J3,K1 | HM | 1.00~4.00 | 75~90 | 74~91 |
霍林河 | J3,K1 | HM | 0.50~6.00 | 91 | >100 | |
海拉尔 | 呼和湖 | K2 | HM,CY | 3.00 | — | 32~80 |
伊敏 | K1 | HM-CY,JM | 0.50~9.00 | — | — | |
鸡西 | 梨树 | K1 | FM,JM | 6.00~10.00 | 90 | 86~99 |
Table 2
Comparison of the enrichment and occurrence characteristics between low-rank and middle-to high-rank CBM in China"
煤阶 | 煤层气成因 | 储层特征 | 富集要素 | 产出要素 | 富集模式 | 高产模式 |
---|---|---|---|---|---|---|
中-高煤阶 | 深成热变质作用成因 | 生气量大、吸附能力强,微小孔发育,连续性好 | 埋深、构造和煤体结构等 | 含气量和渗透率耦合配置 | 向斜富集、褶曲翼部富集、构造高点和水动力控藏等多类型富集模式 | 埋深和构造应力控制渗透率,吸附气与深部游离气共聚 |
低煤阶 | 热成因与生物成因共存,生物成因气占比大 | 相对高孔、高渗,厚层多或多薄层叠置 | 煤厚、埋深和储层封闭性等 | 气源补充与物性匹配性 | 浅部在盆缘斜坡带新成藏、小型断陷古成藏和淡水补给缓流成藏等;深部受构造和保存条件影响 | 气源补给(生物成因气和深部热成因气),厚煤层、多薄层合采 |
Table 3
Assessment parameters and classification criteria for play fairways of low-rank CBM in China"
条件类型 | 条件 权重 | 典型参数 | Ⅰ类区 | Ⅱ类区 | Ⅲ类区 | 典型盆地指标 | |
---|---|---|---|---|---|---|---|
煤岩条件 | 0.05 | Ro/% | ≥0.6 | 0.6 ~ 0.4 | ≤0.4 | 二连盆地整体上小于其他盆地 | |
资源条件 | 0.25 | 煤层 厚度 | 单煤层 | 相对厚度越大越好 | 二连盆地整体上高于其他盆地 | ||
多薄煤层 | 低煤阶多薄煤层发育,累计厚度越大越好 | 累计厚度:吐哈盆地>二连盆地>准噶尔盆地>鄂尔多斯盆地 | |||||
含气量 | 根据具体盆地调整 | 整体上,准噶尔盆地>吐哈盆地与鄂尔多斯盆地>二连盆地 | |||||
气源补给 | 大量生物成因气补给 | 少量生物成因气补给 | 无外源气补给 | 生物成因气补给对二连盆地煤层气控制更显著 | |||
保存条件 | 0.20 | 盖层条件 | 封闭性好 | 封闭性较好 | 封闭性差 | — | |
水文地质条件 | 深部滞留区、浅部弱径流区 | 中、深部 弱径流区 | 径流区 | 水动力对鄂尔多斯盆地和二连盆地影响更为显著 | |||
产出条件 | 0.25 | 渗透率/(10-3 μm2) | ≥1.0 | 1.0 ~ 0.1 | ≤0.1 | — | |
煤层倾角 | 倾角≤15°时,不列为指标参数;倾角≥70°时, 划分为Ⅲ类区 | 准噶尔盆地煤层倾角最大,吐哈盆地次之,鄂尔多斯盆地和二连盆地煤层倾角不列为指标参数 | |||||
可改造性 | 0.25 | 煤体结构 | 原生结构、碎裂煤 | 碎粒煤 | 糜棱煤 | — | |
岩石力学性质 | 高杨氏模量,低泊松比 | 低杨氏模量,高泊松比 | — |
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