收稿日期: 2011-12-28
修回日期: 2012-04-18
网络出版日期: 2012-08-10
基金资助
国家自然科学基金项目(编号:50874114);国土资源部国家油气专项(编号:2009GYXQ15)联合资助.
A New Model for Shale Adsorptive Gas Amount under a Certain Geological Conditions of Temperature and Pressure
Received date: 2011-12-28
Revised date: 2012-04-18
Online published: 2012-08-10
页岩气在页岩储层中的赋存方式主要以吸附和游离为主,页岩吸附气含量是页岩气资源评价和目标区优选的关键性参数,也是评价页岩是否具有开采价值的一个重要标准。通过室内不同温度下的等温吸附实验,获得页岩等温吸附特征曲线及Langmuir体积和Langmuir压力值,分析温度对页岩吸附气含量的影响程度,利用Langmuir模型计算地层压力条件下的吸附气含量。根据温度、压力、TOC值、RO值与吸附气含量之间的关系,建立考虑地层温度、压力、有机碳含量和成熟度4个因素的页岩吸附气含量计算新模型。新模型可计算任意埋藏深度下的页岩吸附气含量,埋藏深度越大,页岩吸附气含量越小。最后应用某一页岩气藏基础资料进行实例分析,建立得到的温度、压力、TOC值、RO值与页岩吸附气含量的复相关系数可达0.9以上。通过新模型计算未知页岩吸附气含量的页岩,计算结果准确可靠,能正确评价页岩气资源量,可以作为一种计算页岩吸附气含量的新方法。同时采用新的页岩吸附气含量计算模型,弥补了目前普遍采用没有考虑地层温度的等温吸附实验方法所获取吸附气含量的不足,具有重要的现实意义。
关键词: 页岩储层; 温度; 吸附气含量; 新模型; Langmuir模型
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 . DOI: 10.11764/j.issn.1672-1926.2012.04.791
Shale gas mainly occurs as the state of absorption and free in shale reservoirs.The amount of shale adsorbed gas is not only a key parameter of shale gas resource evaluation and target area selection,but also an important standard to evaluate the mining value of shale.We do the isothermal adsorption experiment to obtain the curve of shale adsorption and the parameters of Langmuir volume and Langmuir pressure.We discuss the influence of temperature on shale adsorbed gas and use the Langmuir model to calculate the amount of shale adsorbed gas under formation pressure conditions.According to correlation between temperature,pressure,organic carbon,maturity and gas adsorbed amount,we establish a new model to calculate the amount of shale adsorbed gas as considering formation temperature,pressure,organic carbon,thermal maturity.The new model can calculate the amount of shale adsorbed gas at any burial depth;with the burial depth increases,the amount of shale adsorbed gas decreases.We use the data from one shale gas reservoir to establish the correlation between temperature,pressure,TOC,RO,and gas adsorbed amount,the multiple correlation coefficient is more than 0.95.So,the new model has a potential ability to calculate the amount of the unknown shale adsorbed gas;the calculation result is accurate and reliable and can be used to correctly evaluate the resources yield of shale gas.The new model for calculating the amount of shale adsorbed gas will repair the current method which is generally used without considering the amount of shale adsorbed gas under the isothermal adsorption condition.
Key words: Shale reservoir; Temperature; Gas adsorbed amount; New model; Langmuir model
[1]Yan Cunzhang,Huang Yuzhen,Ge Chunmei,et al.Shale gas:Enormous potential of unconventional natural gas resources[J].Natural Gas Industry,2009,35(5):79-83.[闫存章,黄玉珍,葛春梅,等.页岩气是潜力巨大的非常规天然气资源[J].天然气工业,2009,35(5):79-83.]
[2]Ancell K L,Price H S,Ford W K.An Investigation of the Gas Producing and Storage Mechanism of the Devonian Shale at Cottageville Field[C].SPE7938,1979.
[3]Wang Pengwan,Chen Ziliao,He Xunyun,et al.Accumulation of lower Cambrian Niutitang shale gas and prediction of potential area in Qiannan sag[J].Natural Gas Geoscience,2011,22(3):518-523.[王鹏万,陈子炓,贺训云,等.黔南坳陷下寒武统页岩气成藏条件与有利区带评价[J].天然气地球科学,2011,22(3):518-523.]
[4]Manrique J F,Poe B D,England K.Production Optimization and Practical Reservoir Management of Coal Bed Methane Reservoirs[C].SPE 67315,2001.
[5]Zou Caineng,Dong Dazhong,Wang Shejiao,et al.Geological characteristics,formation mechanism and resource potential of shale gas in China[J].Petroleum Exploration and Development,2010,37(6):641-653.[邹才能,董大忠,王社教,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.]
[6]Dong Dazhong,Cheng Keming,Wang Shiqian,et al.An evaluation method of shale gas resource and its application in the Sichuan basin[J].Natural Gas Industry,2009,29(5):33-40.[董大忠,程克明,王世谦,等.页岩气资源评价方法及其在四川盆地的应用[J].天然气工业,2009,29(5):33-40.]
[7]Nie Haikuan,Tang Xuan,Bian Ruikang.Controlling factors for shale gas accumulation and prediction of potential development area in shale gas reservoir of south China[J].Acta Petrolei Sinica,2009,30(4):484-491.[聂海宽,唐玄,边瑞康.页岩气成藏控制因素及中国南方页岩气发育有利区预测[J].石油学报,2009,30(4):484-491.]
[8]Xiong Wei,Guo Wei,Liu Honglin,et al.Shale reservoir characteristics and isothermal adsorption properties[J].Natural Gas Industry,2010,32(1):1-4.[熊伟,郭为,刘洪林,等.页岩的储层特征以及等温吸附特征[J].天然气工业,2010,32(1):1-4.]
[9]Li Wuguang,Yang Shenglai,Yin Dandan,et al.Development technology and strategy of shale gas[J].Natural Gas and Oil,2011,29(1):34-37.[李武广,杨胜来,殷丹丹,等.页岩气开发技术与策略综述[J].天然气与石油,2011,29(1):34-37.]
[10]Chen Shangbin,Zhu Yanming,Wang Hongyan,et al.Research status and trends of shale gas in China[J].Acta Petrolei Sinica,2010,31(4):659-664.[陈尚斌,朱炎铭,王红岩,等.中国页岩气研究现状与发展趋势[J].石油学报,2010,31(4):659-664.]
[11]Wang Feiyu,He Zhiyong,Meng Xiaohui,et al.Occurrence of shale gas and prediction of original gas in-place(OGIP)[J].Natural Gas Geoscience,2011,22(3):501-510.[王飞宇,贺志勇,孟晓辉,等.页岩气赋存形式和初始原地气量(OGIP)预测技术[J].天然气地球科学,2011,22(3):501-510.]
[12]Zhang Jinchuan,Jin Zhijun,Yuan Mingsheng.Reservoiring mechanism of shale gas and its distribution[J].Natural Gas Industry,2004,24(7):15-18.[张金川,金之钧,袁明生.页岩气成藏机理和分布[J].天然气工业,2004,24(7):15-18.]
[13]Sigal R F,Qin B.Examination of the importance of self diffusion in the transportation of gas in shale gas reservoirs[J].Petrophysics,2008,49(3):301-305.
[14]Li Wuguang,Yang Shenglai.Research on shale gas development target area of optimization system and evaluation[J].Natural Gas Industry,2011,31(4):59-62.[李武广,杨胜来.页岩气开发目标区优选体系与评价方法[J].天然气工业,2011,31(4):59-62.]
[15]Javadpour F,Fisher D,Unsworth M.Nanoscale gas flow in shale gas sediments[J].Journal of Canadian Petroleum Technology,2007,46(10):55-61.
[16]Long Pengyu,Zhang Jinchuan,Tang Xuan,et al.Feature of muddy shale fissure and its effect for shale gas exploration and development[J].Natural Gas Geoscience,2011,22(3):525-531.[龙鹏宇,张金川,唐玄,等.泥页岩裂缝发育特征及其对页岩气勘探和开发的影响[J].天然气地球科学,2011,22(3):525-531.]
[17]Sun Yukai,Li Xinning,He Renzhong,et al.Favorable targets for shale gas exploration in Tuba basin[J].Xinjiang Petroleum Geology,2011,32(1):4-6.[孙玉凯,李新宁,何仁忠,等.吐哈盆地页岩气有利勘探方向[J].新疆石油地质,2011,32(1):4-6.]
[18]Scott L,Daniel M,Kent A,et al.Mississippian Barnett shale,Fort Worth basin,north-central Texas:Gas-shale play with multi-trillion cubic foot potential[J].AAPG Bulletin,2005,89(2):155-175.
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