Oil & Gas Geology ›› 2024, Vol. 45 ›› Issue (6): 1590-1604.doi: 10.11743/ogg20240607
• Petroleum Geology • Previous Articles Next Articles
Mingrui LI1,2(), Yunhe SHI1,3(), Liyong FAN1,3, Xianduo DAI1,3, Xueyuan JING1,3, Yi ZHANG4
Received:
2024-05-26
Revised:
2024-07-01
Online:
2024-12-30
Published:
2024-12-31
Contact:
Yunhe SHI
E-mail:lmrui_cq@petrochina.com.cn;syhe_cq@petrochina.com.cn
CLC Number:
Mingrui LI, Yunhe SHI, Liyong FAN, Xianduo DAI, Xueyuan JING, Yi ZHANG. Comparison of main reservoir characteristics between deep coal-rock gas of the No. 8 coal seam of the Upper Paleozoic Benxi Formation and tight sand gas reservoirs, Ordos Basin[J]. Oil & Gas Geology, 2024, 45(6): 1590-1604.
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Table 3
Criteria for classifying coal structures"
煤体结构 | 分层特征 | 层理特征 | 破碎程度 | 裂隙发育特征 | 手试硬度 |
---|---|---|---|---|---|
原生 结构煤 | 平行层状, 上、下层整合接触 | 平行层理,带状结构 | 呈棱角状块体, 且无相对位移 | 原生割理发育, 连通性较好 | 硬度较强, 煤块沿割理面断开 |
碎裂煤 | 类似层状的透镜体 | 层理界限清晰, 呈条带状结构 | 块体呈棱角状, 出现块体间的相对位移 | 发育割理和裂隙,且连通性好 | 煤块易沿裂隙面断开 |
碎粒煤 | 透镜体和团块, 与上、下层不整合接触 | 条状结构遭受破坏, 层理界限不清晰 | 块体遭受揉皱破碎, 粒径>1 mm | 割理遭受破坏, 连通性变差 | 硬度较小,易搓成碎粒 |
糜棱煤 | 透镜体和团块,揉皱分状, 与上、下层不整合接触 | 原生条状结构遭受破坏,层理不清晰 | 煤体严重破碎呈粒状或粉状, 粒径<1 mm | 发育揉皱镜面 | 硬度和强度很低, 呈粉末或粉尘状 |
Table 4
Comparison of gas composition between deep coal-rock gas in the No. 8 coal seam of the Benxi Formation and tight-sand gas in the Sulige gas field along the eastern margin of the Ordos Basin"
层位 | 天然气主要组分含量/% | H2S含量/(g/m3) | 天然气相对密度 | |||
---|---|---|---|---|---|---|
CH4 | C2H6 | N2 | CO2 | |||
8#煤岩 | 95.17~98.34 | 0.03~1.72 | 0.05~3.28 | 0.52~1.21 | 0.007~0.013 | 0.603 9~0.631 0 |
(96.92) | (0.61) | (1.47) | (0.85) | (0.010) | (0.613 5) | |
盒8段 | 92.59~98.56 | 0.42~5.50 | 0~2.65 | 0~2.39 | 0 | 0.561 7~0.606 1 |
(95.73) | (2.35) | (0.34) | (0.59) | (0.581 1) | ||
山1段 | 91.93~98.50 | 0.06~6.22 | 0~4.32 | 0~2.56 | 0 | 0.553 0~0.598 3 |
(94.77) | (2.68) | (1.06) | (0.79) | (0.580 7) |
Table 5
Comparison of formation water properties between deep coal-rock gas reservoirs in the No. 8 coal seam of the Benxi Formation and tight-sand gas reservoirs in the Sulige gas field along the eastern margin of the Ordos Basin"
层位 | 取值 | 地层水离子浓度/(mg/L) | 总矿化度 | 水型 | |||||
---|---|---|---|---|---|---|---|---|---|
K++Na+ | Ca2+ | Mg2+ | Cl- | SO42- | HCO3- | ||||
8#煤岩 | 范围值 | 8 964~1 8261 | 3 880~15 407 | 589~905 | 23 642~53 648 | 2 325~4 649 | 234~505 | 41 600~89 800 | CaCl2型 |
平均值 | (12 072) | (10 259) | (652) | (36 031) | (3 272) | (360) | (62 200) | ||
盒8段 | 范围值 | 2 544~9 619 | 2 883~8 946 | 94~2 345 | 11 973~27 452 | 238~8 842 | 114~530 | 21 500~50 300 | CaCl2型 |
平均值 | (6 284) | (5 421) | (565) | (17 123) | (2 102) | (330) | (33 900) | ||
本溪组 砂岩 | 范围值 | 3 452~54 442 | 2 910~63 912 | 196~12 155 | 1 030~199 123 | 143~16 676 | 468~1 230 | 17 900~323 400 | CaCl2型 |
平均值 | (20 361) | (25 936) | (2 591) | (80 029) | (3 914) | (621) | (132 000) |
Table 6
Comparison of production performance of horizontal wells between deep coal-rock gas reservoirs in the No. 8 coal seam of the Benxi Formation and tight-sand gas reservoirs in the Sulige gas field along the eastern margin of the Ordos Basin"
层位 | 试气井口产量/(104 m3/d) | 稳定日产量/(104 m3) | 压降速率/(MPa/d) | 单井EUR/(104 m3) |
---|---|---|---|---|
8#煤岩 | 3.2~24.6 | 1.0~7.5 | 0.003~0.018 | 3 100~7 960 |
(10.0) | (4.3) | (0.009) | (5 580) | |
盒8段 | 2.0~50.0 | 0.8~6.5 | 0.002~0.032 | 2 100~7 420 |
(9.8) | (4.0) | (0.021) | (5 800) |
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