页岩气吸附模型的适用性研究

doi:10.3969/j.issn.1672-7703.2018.01.011

摘要/Abstract

摘要： 页岩气吸附特征对于页岩气储量预测、渗流机理分析、产能评价有重要影响，而吸附模型是描述页岩气吸附特征的主要方法之一。目前国内外学者在页岩气吸附模型的选用上存在一定分歧，即对页岩气吸附模型的适用性认识不清。针对此问题，通过吸附模型与页岩对甲烷等温吸附实验数据的拟合，就4种常用吸附模型（Langmuir模型、BET模型、D-R模型、半孔宽模型）对于页岩气的适用性展开了深入研究。结果认为：Langmuir模型、BET模型未考虑到页岩孔隙表面各个活性位吸附能级的差异，当压力较低时，模型拟合误差相对较大；D-R模型考虑低压力区间的超高吸附量，只适用于微孔占孔隙比重较大的页岩；半孔宽模型将吸附势理论与页岩的孔径分布进行了综合考虑，与实验数据的拟合结果较好。4种典型吸附模型与鄂尔多斯盆地富县区页岩对甲烷等温吸附实验数据的拟合误差从小到大排序为：半孔宽模型、Langmuir模型、BET模型、D-R模型。

关键词: 页岩气, 吸附模型, 等温吸附, 适用性

Abstract: The adsorption characteristics of shale gas have great influence on its reserves prediction, seepage mechanism analysis and productivity evaluation. The adsorption model is one of the principal methods to describe shale gas adsorption characteristics. So far, scholars at home and abroad have different opinions on the selection of adsorption models for shale gas. It is revealed that the applicability of adsorption models to shale gas is not understood clearly. To solve this problem, the applicability of four common adsorption models (i.e., Langmuir model, BET model, D-R model and half pore width model) to shale gas was studied thoroughly by fitting the adsorption models to the experimental data of methane isothermal adsorption on shale. And the following research results were obtained. First, neither Langmuir model nor BET model considers the adsorption energy level difference of active sites on the surface of shale pores, so their fitting errors are larger when the pressure is lower. Second, D-R model considers the ultrahigh adsorption in the interval of low pressure, so it is only applicable to the shale possessing more micro pores. Third, half pore width model takes into consideration the adsorption potential theory and the pore diameter distribution of shale comprehensively, and it is well fitted with the experimental data. And fourth, the fitting errors between four common adsorption models and experiment data of methane isothermal adsorption on shale in Fuxian area of the Ordos basin are ranked from the low to the high, i.e., half pore width model, Langmuir model, BET model and D-R model.

Key words: shale gas, adsorption model, isothermal adsorption, applicability

中图分类号:

贺然, 李治平, 赖枫鹏, 唐玄. 页岩气吸附模型的适用性研究[J]. 中国石油勘探, 2018, 23(1): 100-108.

He Ran, Li Zhiping, Lai Fengpeng, Tang Xuan. Study on the applicability of adsorption models to shale Gas[J]. China Petroleum Exploration, 2018, 23(1): 100-108.

参考文献

[1] 张金川,林腊梅,李玉喜,姜生玲,刘锦霞,姜文利,等. 页岩气资源评价方法与技术:概率体积法[J].地学前缘,2012,19(2):184-191. Zhang Jinchuan, Lin Lamei, Li Yuxi, Jiang Shengling, Liu Jinxia, Jiang Wenli, et al. The method of shale gas assessment:probability volume method[J]. Earth Science Frontiers,2012,19(2):184-191.
[2] 杨振恒,李志明,沈宝剑,韩志艳.页岩气成藏条件及我国黔南坳陷页岩气勘探前景浅析[J]. 中国石油勘探,2009,14(3):24-28. Yang Zhenheng, Li Zhiming, Shen Baojian, Han Zhiyan. Shale gas accumulation conditions and exploration prospect in southern Guizhou depression[J]. China Petroleum Exploration,2009,14(3):24-28.
[3] 邹才能,董大忠,王社教,李建忠,李新景,王玉满,等.中国页岩气形成机理、地质特征及资源潜力[J].石油勘探与开发,2010,37(6):641-653. Zou Caineng, Dong Dazhong, Wang Shejiao, Li Jianzhong, Li Xinjing, Wang Yuman, et al. Geological characteristics,formation mechanism and resource potential of shale gas in China[J]. Petroleum Exploration and Development,2010,37(6):641-653.
[4] 冯建辉,牟泽辉.涪陵焦石坝五峰组-龙马溪组页岩气富集主控因素分析[J]. 中国石油勘探,2017,22(3):32-39. Feng Jianhui, Mou Zehui. Main factors controlling the enrichment of shale gas in Wufeng Formation-Longmaxi Formation in Jiaoshiba area, Fuling shale gas field[J]. China Petroleum Exploration, 2017,22(3):32-39.
[5] Curtis J B. Fractured shale-gas systems[J]. AAPG Bulletin,2002,86(11):1921-1938.
[6] 王德龙,郭平,陈恒,付微风,汪忠德,丁洪坤.新吸附气藏物质平衡方程推导及储量计算[J]. 岩性油气藏,2012,24(2):83-86. Wang Delong, Guo Ping, Chen Heng, Fu Weifeng, Wang Zhongde, Ding Hongkun. Derivation of new material balance equation for adsorbed gas reservoir and reserve estimation[J]. Lithology Reservoirs,2012,24(2):83-86.
[7] 邓佳,朱维耀,刘锦霞,张贞,马千,张萌,等.考虑应力敏感性的页岩气产能预测模型[J].天然气地球科学,2013,24(3):456-460. Deng Jia, Zhu Weiyao, Liu Jinxia, Zhang Zhen, Ma Qian, Zhang Meng, et al. Productivity prediction model of shale gas considering stress sensitivity[J]. Natural Gas Geoscience,2013,24(3):456-460.
[8] 杨明清,刘杰,任收麦,黄子舰,孟凡洋,吴非,等.岩石解吸气测定仪在页岩气勘探中的应用[J]. 中国石油勘探, 2016,21(6):120-124. Yang Mingqing, Liu Jie, Ren Shoumai, Huang Zijian, Meng Fanyang, Wu Fei, et al. Application of rock desorbed gas determinator in shale gas exploration[J]. China Petroleum Exploration, 2016,21(6):120-124.
[9] 郭肖,任影,吴红琴.考虑应力敏感和吸附的页岩表观渗透率模型[J]. 岩性油气藏,2015,27(4):109-112. Guo Xiao, Ren Ying, Wu Hongqin. Apparent permeability model of shale gas considering stress sensitivity and adsorption[J]. Lithology Reservoirs,2015,27(4):109-112.
[10] 李武广,杨胜来,徐晶,董谦.考虑地层温度和压力的页岩吸附气含量计算新模型[J]. 天然气地球科学,2012,23(4):791-796. Li Wuguang, Yang Shenglai, Xu Jing, Dong Qian. A new model for shale adsorptive gas amount under a certain geological conditions of temperature and pressure[J]. Natural Gas Geoscience,2012,23(4):791-796.
[11] 张键.鄂尔多斯盆地富县区陆相页岩气吸附与解吸附研究[D].成都:西南石油大学,2013:70-73. Zhang Jian. Study on adsorption and desorption of continental shale gas in Ordos Basin Fu Xian area[D]. Chengdu:Southwest Petroleum University, 2013:70-73.
[12] 赵天逸,宁正福,何斌,张廉.页岩等温吸附理论模型对比分析[J]. 重庆科技学院学报:自然科学版,2014,16(6):55-58. Zhao Tianyi, Ning Zhengfu, He Bin, Zhang Lian. Comparative analysis of theoretical models of shale[J]. Journal of Chongqing University of Science and Technology:Natural Sciences Edition,2014,16(6):55-58.
[13] 梁彬,姜汉桥,李俊键,糜利栋,王磊.考虑多因素的页岩气吸附能力计算模型[J].特种油气藏,2015,22(1):121-123. Liang Bin, Jiang Hanqiao, Li Junjian, Mi Lidong, Wang Lei.Calculation model of multi-factor shale gas adsorption capacity[J]. Special Oil & Gas Reservoirs, 2015,22(1):121-123.
[14] 向祖平,李志军,陈朝刚,刘林清,黄小亮,肖前华,等.页岩气容量法等温吸附实验气体状态方程优选[J].天然气工业,2016,36(8):73-78. Xiang Zuping, Li Zhijun, Chen Zhaogang, Liu Linqing,Huang Xiaoliang, Xiao Qianhua, et al. Selection of shale gas state equation for volumetric isothermal adsorption experiment[J].Natural Gas Industry, 2016,36(8):73-78.
[15] 周正武,刘新凯,王延忠,林中月,马俯波,于鹏,等.保靖地区龙马溪组高成熟海相页岩吸附气量及其影响因素[J].中国石油勘探, 2017,22(4):73-83. Zhou Zhengwu, Liu Xinkai, Wang Yanzhong, Lin Zhongyue, Ma Fubo, Yu Peng, et al. Gas adsorption capacity of Longmaxi Formation high-maturity marine shale in Baojing area and its influential factors[J]. China Petroleum Exploration, 2017,22(4):73-83.
[16] 刘圣鑫,钟建华,马寅生,尹成明,刘成林,李宗星,等.柴东石炭系页岩微观孔隙结构与页岩气等温吸附研究[J].中国石油大学学报:自然科学版,2015,39(1):33-42. Liu Shengxin,Zhong Jianhua,Ma Yinsheng,Yin Chengming,Liu Chenglin,Li Zongxing,et al. Study of microscopic pore structure and adsorption isothermal of carboniferous shale,eastern Qaidam Basin[J]. Journal of China University of Petroleum:Edition of Natural Science,2015,39(1):33-42.
[17] Yu W, Sepehrnoori K, Patzek T W. Evaluation of gas adsorption in Marcellus Shale[C]//SPE Annual Technical Conference and Exhibition. SPE-170801-MS. Amsterdam:Society of Petroleum Engineers,2014:27-29.
[18] Zhao T, Li X, Zhao H, Dou X. Micro-storage state and adsorption behavior of shale gas[C]//SPE Nigeria Annual International Conference and Exhibition. SPE-178386-MS. Lagos:Society of Petroleum Engineers,2015:4-6.
[19] 欧成华.高温高压下烃类气体在储层孔隙介质表面吸附的实验与理论研究[D].成都:西南石油大学,2000. Ou Chenghua. Study on experiment and theory on adsorption and desorption of light paraffinic hydrocarbons in real reservoir cores at high temperature and high pressure[D]. Chengdu:Southwest Petroleum University,2000.
[20] 王亮,陈云燕,刘玉霞.川东南彭水地区龙马溪组页岩孔隙结构特征[J].中国石油勘探,2014,19(5):80-88. Wang Liang, Chen Yunyan, Liu Yuxia. Shale porous structural characteristics of Longmaxi Formation in Pengshui area of Southeast Sichuan Basin[J]. China Petroleum Exploration, 2014,19(5):80-88.
[21] 尉鹏飞,张金川,隆帅,彭建龙,邓恩德,吕艳南,等.四川盆地及周缘地区龙马溪组页岩微观孔隙结构及其发育主控因素[J].中国石油勘探,2016,21(5):42-51. Wei Pengfei,Zhang Jinchuan,Long Shuai,Peng Jianlong,Deng Ende,Lü Yannan,et al. Characteristics and controlling factors of microscopic pore structure of Longmaxi Formation in Sichuan Basin and its periphery[J]. China Petroleum Exploration,2016,21(5):42-51.
[22] 杨峰,宁正福,孔德涛,彭攀,赵华伟.页岩甲烷吸附等温线拟合模型对比分析[J]. 煤炭科学技术,2013,41(11):86-89. Yang Feng, Ning Zhengfu, Kong Detao, Peng Pan, Zhao Huawei. Comparison analysis on model of methane adsorption isotherms in shale gas[J]. Coal Science and Technology,2013,41(11):86-89.
[23] 唐洪明,王俊杰,张烈辉,郭晶晶,刘佳,庞铭.页岩比表面积测试方法与控制因素研究[J].天然气地球科学,2015,26(11):2009-2016. Tang Hongming,Wang Junjie,Zhang Liehui,Guo Jingjing,Liu Jia,Pang Ming. Testing method and controlling factors of specific surface area of shale gas[J]. Natural Gas Geoscience,2015,26(11):2009-2016.
[24] Ross D J K,Bustin R M. Characterizing the shale gas resource potential of Devonian-Mississippian strata in the Western Canada sedimentary basin:application of an integrated formation evaluation[J]. American Association of Petroleum Geologists,2008,92(1):87-125.
[25] 熊健,罗丹序,刘向君,梁利喜.鄂尔多斯盆地延长组页岩孔隙结构特征及其控制因素[J]. 岩性油气藏,2016,28(2):16-23. Xiong Jian, Luo Danxu, Liu Xiangjun, Liang Lixi. Characteristics and controlling factors of shale pore structure of Yanchang Formation in Ordos Basin[J]. Lithologic Reservoirs,2016,28(2):16-23.
[26] 龚小平,唐洪明,赵峰,王俊杰,熊浩. 四川盆地龙马溪组页岩储层孔隙结构的定量表征[J].岩性油气藏,2016,28(3):48-57. Gong Xiaoping, Tang Hongming, Zhao Feng, Wang Junjie, Xiong Hao. Quantitative characterization of pore structure in shale reservoir of Longmaxi Formation in Sichuan Basin[J]. Lithologic Reservoirs,2016,28(3):48-57.
[27] Ross D J K,Bustin R M. The importance of shale composition and pore structure upon gas storage potential of shale gas reservoirs[J]. Marine & Petroleum Geology,2009,26(6):916-927.
[28] 李卫兵,姜振学,李卓,陈磊,王朋飞.渝东南页岩微观孔隙结构特征及其控制因素[J].特种油气藏,2016,23(2):50-54. Li Weibing, Jiang Zhenxue, Li Zhuo, Chen Lei, Wang Pengfei.Micro-pore structure characteristics of shale in southeast Chongqing and the controlling factors[J]. Special Oil & Gas Reservoirs, 2016,23(2):50-54.
[29] Grieser W,Shelley R,Soliman M. Predicting production outcome from multistage,horizontal Barnett completions[C]//SPE Production and Operations Symposium. SPE-120271-MS. Oklahoma:Society of Petroleum Engineers,2009:4-8.