Study on site selection of underground gasification in deep coal seam: a case study of J148 area in Dongsheng Gas Field
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摘要: 从地质构造、水文地质、煤层气化适用性等角度，系统研究了东胜气田J148地区中生界侏罗系中下统延安组延9煤层地下气化的可行性，并探讨了利用深部煤层气化燃空区孔隙层、含水层及该区致密气层进行碳封存的前景。研究结果表明，该区延9煤层埋深1 264~1 285 m、倾角小于1°，煤层稳定性好。气化目标选区内地层断层、节理裂隙不发育，偶有裂隙但断面新鲜、闭合，煤层气化后空腔有较好的密闭性，对煤炭地下气化影响小，有利于气化炉的建设和扩展，可满足规模化煤炭地下气化项目实施。延9煤层顶底板存在连续的隔水层，能阻截地下水对煤层直接充水，有利于地下气化炉布置；顶板隔水层厚度小于导水裂隙带高度，存在垮落导通顶板含水层间接充水的风险，但顶板含水层属弱富水含水层，涌水量小，风险可控；底板隔水层厚度大于隔水层的安全厚度，能有效阻截煤层底板含水层对煤层直接充水的风险。总体而言，延9煤层厚度适中、夹矸少，属低灰、低硫、高热值不黏煤，煤焦反应活性高，具有良好开发前景。针对深部煤层规模化气化开采产生大量的CO2排放，初步探讨了利用煤层燃空区、顶底板含水层和下部致密天然气层进行CO2安全封存可行性。分析认为，在延9煤层气化燃空区孔隙层和顶底板含水层中，可封存煤层气化产生的CO2的60.8 % ~88.2 %；若结合东胜气田上古生界致密天然气开发，用煤气化产生CO2进行天然气驱替与封存，有望实现深部煤层气化开采过程近零碳排放。Abstract: The feasibility of underground gasification of Yan 9 coal seam of the middle-lower Jurassic Yan ′an Formation in J148 area of Dongsheng gas field is systematically studied from the perspectives of geological structure, hydrogeology and coal gasification characteristics, and the prospects of carbon sequestration by using the pore layer, aquifer layer and tight gas layer in the deep coal gasification cavity are discussed.The results show that the coal seam of Yan 9 in this area is stable when the buried depth is 1 264~1 285 m and the dip angle is less than 1°.In the interior of the gasification target constituency, the structural faults are not developed, the joint cracks are not developed, there are occasional cracks but the section is fresh and closed, and the cavity of the coal seam after gasification has a good tightness, which has little influence on the construction and expansion of coal gasification furnace, and can meet the implementation of large-scale coal gasification projects.There is a continuous water barrier layer on the top and bottom of Yan 9 coal seam, which can prevent the influence of groundwater on the direct water filling of coal seam, and is conducive to the layout of underground gasifier.The thickness of the roof water-barrier layer is less than the height of the water-conducting fissure zone, there is a risk of indirect water filling through the roof aquifer, but the roof aquifer is a weak water-rich aquifer, and the risk of small water inflow is controllable.The thickness of the floor water barrier layer is greater than the safe thickness of the floor water barrier layer, which can effectively prevent the risk of direct water filling to the coal seam.In general, Yan 9 coal seam has moderate thickness, little waste, low ash, low sulfur, high calorific value non-stick coal, high coke reactivity, and has a good development prospect.In view of the large amount of CO2 emission from large-scale gasification mining of deep coal seam, the feasibility of CO2 safe geological storage by using coal seam burning and caving area, top and bottom aquifer and lower tight natural gas layer was discussed.The analysis shows that 60.8 % ~88.2 % of CO2 produced by coal seam gasification can be stored in the pore layer and the top and bottom aquifer in the gas-burning and air-burning zone of Yan 9 coal seam.Combined with the development of tight natural gas in the Upper Paleozoic of Dongsheng gas field, it is expected to achieve near-zero carbon emissions in the process of deep coal seam gasification mining by using CO2 generated by coal gasification for natural gas displacement and storage.
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Key words:
- deep coal seam /
- underground coal gasification /
- site selection /
- carbon dioxide storage
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图 3 渠S1井延9煤层及顶底板结构
Figure 3. Structure diagram of coal seam and roof and floor in Ququ S1 well Yan 9
图 4 延9煤层顶底板含(隔)水系统分布
Figure 4. Distribution of water-containing system on the top and bottom of Yan9 coal seam
图 5 J148井区可气化煤炭资源分布
Figure 5. Distribution of gasified coal resources in Jin 148 well area
表 1 延9煤层煤质分析数据
取样位置 水分Mad/% 灰分Ad/% 挥发分Vd/% 碳Cd/% 氢Hd/% 硫St.d/% 发热量Qnet，d/(MJ/kg-1) 煤层上部 2.99 9.65 34.19 74.02 4.54 0.29 28.57 煤层下部 4.01 16.61 34.57 65.02 3.54 0.35 24.31 
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