| 川南地区龙马溪页岩气体滑脱效应实验研究 |
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| 引用本文： | 胡德高,杨峰,舒志国,郑爱维,郑何,吕斌.川南地区龙马溪页岩气体滑脱效应实验研究[J].地质科技通报,2021,40(2):36-41. |
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| 作者姓名： | 胡德高 杨峰 舒志国 郑爱维 郑何 吕斌 |
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| 作者单位： | 中国石油化工股份有限公司江汉油田分公司;中国地质大学（武汉）构造与油气资源教育部重点实验室 |
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| 基金项目： | 国家科技重大专项“涪陵页岩气开发示范工程”2016ZX05060中国石化页岩气“十条龙”科技攻关项目“涪陵页岩气田焦石坝区块稳产技术”P18052国家自然科学基金项目“富有机质页岩微-纳米孔隙结构及其对页岩气赋存的控制机理”51604249 |
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| 摘 要： | 针对页岩储层气体滑脱效应特征及其影响机制不清问题,选取四川盆地长宁地区志留系龙马溪组页岩样品,开展了低温氮气吸附孔隙结构表征实验,并利用非稳态脉冲衰竭方法测量了不同围压下氦气、氮气在页岩岩心上的气体渗透率,分析了平均孔隙压力、气体类型、围压对滑脱效应的影响,建立了滑脱因子的预测关系式。结果表明:压力低于2.5 MPa时,页岩气体滑脱效应不能忽略。由于“分子筛效应”的影响,页岩克氏渗透率与测试流体介质类型有关,以氦气为流动介质测试得到的克氏渗透率大于以氮气为流动介质的测试结果。滑脱效应与气体类型有关,龙马溪组页岩的氦气滑脱因子约为氮气滑脱因子的1.7倍。利用滑脱因子计算得到围压为10~40 MPa时,氦气在页岩上的有效渗流孔径为113~166 nm,氮气的有效渗流孔径为66~99 nm,均远大于液氮吸附法测试的平均孔径。建立了龙马溪组页岩气体滑脱因子与克氏渗透率的幂函数关系,为页岩气流动模型的建立提供了基础。
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| 关 键 词： | 页岩 滑脱效应 渗透率 渗流孔径 四川盆地 |
| 收稿时间： | 2020-05-05 |
Experimental study about the gas slip flow in Longmaxi shales from the southern Sichuan Basin |
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| Institution: | (Jianghan Oilfield Company,SINOPEC,Qianjiang Hubei 433124,China;Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,China University of Geosciences(Wuhan),Wuhan 430074,China) |
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| Abstract: | In order to clarify the gas slip flow effect and its influencing mechanism of shale gas reservoirs, low-temperature nitrogen adsorption measurements were performed on the Silurian Longmaxi Formation shales from the Sichuan Basin. Pore structure characteristics of shales were described based on nitrogen adsorption-desorption isotherms. Non-steady state gas flow experiments on gas shales were carried out to obtain the apparent permeability coefficients of helium and nitrogen. The effects of pore pressure, gas types, confining pressure on gas slippage were discussed. Results show that gas slippage cannot be neglected when the pore pressure is less than 2.5 MPa. The Klinkenberg corrected permeability coefficients of shales are gas-dependent due to the "molecular sieving effect". The Klinkenberg corrected permeability of helium on shales is larger than that of using nitrogen. Gas slippage factors are also related to gas types. Helium slippage factor of shales is about 1.7 times of nitrogen slippage factor. The effective transport pore diameter of helium on shales with the confining pressure being 10-40 MPa ranges from 113 to 166 nm, while that of nitrogen is between 66 and 99 nm. These values are significantly larger than that derived from low-temperature nitrogen adsorption. A power function is utilized to fit the gas slippage factor and permeability of shales and can be used to predict gas flow in shales. |
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| Keywords: | shale slippage effect permeability transport pore diameter Sichuan Basin |
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