应用三分量地震数据提高Langmuir法计算煤层气含量的精度——以淮南顾桥煤矿为例
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摘要
在实验室解析得出吸附参数的基础上,使用Langmuir方程计算煤层气含量是目前预测煤层中煤层气含量的主要方法之一。此方法需已知地应力和地层容重数据,在钻孔数量有限时,其预测精度有限。在已有钻孔测试数据和测井数据的基础上,通过三分量地震数据与测井资料联合反演获得地层密度和纵、横波速度,直接计算精确的泊松比参数,进一步得到精确的地应力和地层容重,从而提高Langmuir法预测煤层气含量的精度。结合淮南顾桥煤矿三维三分量地震数据和综合地球物理测井资料,计算了该区不同深度煤层的密度、泊松比和金尼克静水压力,提高了煤层气含量的计算精度。
Calculating coal-bed methane by using Langmuir equation on the basis of obtained absorption parameters in the laboratory is one of the mainly used methods to predict coal-bed methane content.This method needs given crustal stress and bulk density,which have lower accuracy with less bore holes.With borehole and logging data,coal-bed density,P-wave and S-wave velocity can be obtained by joint inversion combining three-component seismic data with logging data.Then the Possion's ratio can be directly calculated.Furthermore,the crustal stress and bulk density can be obtained precisely.By this means,we can improve the accuracy of Langmuir method in predicting coal-bed methane content.At Guqiao Coalfield in Huainan by applying this workflow to 3D3C seismic data and logging data,the density,Possion's ratio and hydrostatic pressure of the coal-bed with different depth were calculated.As a result,the computation accuracy of coal-bed methane content is enhanced.
Calculating coal-bed methane by using Langmuir equation on the basis of obtained absorption parameters in the laboratory is one of the mainly used methods to predict coal-bed methane content.This method needs given crustal stress and bulk density,which have lower accuracy with less bore holes.With borehole and logging data,coal-bed density,P-wave and S-wave velocity can be obtained by joint inversion combining three-component seismic data with logging data.Then the Possion's ratio can be directly calculated.Furthermore,the crustal stress and bulk density can be obtained precisely.By this means,we can improve the accuracy of Langmuir method in predicting coal-bed methane content.At Guqiao Coalfield in Huainan by applying this workflow to 3D3C seismic data and logging data,the density,Possion's ratio and hydrostatic pressure of the coal-bed with different depth were calculated.As a result,the computation accuracy of coal-bed methane content is enhanced.
引文
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[17]刘斌,席道瑛,葛宁洁,等.不同围压下岩石中泊松比的各向异性[J].地球物理学报,2002,45(6):880-890Liu B,Xi D Y,Ge N J,et al.Anisotropy of poissonsratio in rock samples under confining pressures[J].Chinese Journal of Geophysics,2002,45(6):880-890
[18]傅雪海,吴桁,权彪,等.淮南潘谢深部煤层含气预测[C]//中国煤炭学会煤层气专业委员会,中国石油学会石油地质专业委员会.2008年煤层气学术研讨会论文集.北京:地质出版社,2008:151-157Fu X H,Wu H,Quan B,et al.Prediction of gas con-tent in deep coalbeds at Panxie area of Huainancoalfield[C]//Coalbed Methane Specialized Com-mittee of the China Coal Society,Petroleum GeologySpecialized Committee of the Chinese Petroleum So-ciety.2008 Coalbed Methane Symposium Proceed-ings.Beijing:Geological Publishing House,2008:151-157
[2]焦作矿业学院瓦斯地质研究室.瓦斯地质概论[M].北京:地质出版社,1990:116-124Gas Geological Research Center of Jiaozuo MiningInstitute.Introduction to Gas Geology[M].Beijing:Geological Publishing House,1990:116-124
[3]鲜学福,辜敏.有关间接法预测煤层气含量的讨论[J].中国工程科学,2006,8(8):16-22Xian X F,Gu M.Discussion on the content of coalbed gas predicted by indirect method[J].Engineer-ing Sciences,2006,8(8):16-22
[4]刘保县,鲜学福,徐龙君,等.地球物理场对煤吸附瓦斯特性的影响[J].重庆大学学报,2000,23(5):78-81Liu B X,Xian X F,Xu L J,et al.Study on adsorptioncharacteristics of coal to gas in geophysical field[J].Journal of Chongqing University,2000,23(5):78-81
[5]Brunauer S,Emmett P H,Teuer E.Adsorption ofgases in multimolecular layers[J].Journal of Ameri-can Chemical Society,1938,60(2):309-319
[6]Gregg S J,Sing K S W.Adsorption,Surface Areaand Porosity[M].2nd ed.London and New York:Academic Press,1982:42-56
[7]中华人民共和国国家标准.GB/T19559-2004煤层气含量测定方法[S].国家质量监督检验检疫总局,国家标准化管理委员会.北京:中国标准出版社,2004:1-6Natioinal Standards of The Peoples Republic of Chi-na.GB/T 19559-2004 Method of determining coal-bed methane content[S].General Administration ofQuality Supervision,Inspection and Quarantine ofThe Peoples Republic of China,Standardization Ad-ministration of The Peoples Republic of China.Bei-jing:Standards Press of China,2004:1-6
[8]叶晓斌.煤层气常规测井方法探讨[J].云南地质,2000,19(4):371-375Ye X B.A discussion about the common loggingmethods of coalbed methane[J].Yunnan Geology,2000,19(4):371-375
[9]陈大力,陈洋.对我国煤层瓦斯含量测定方法的评述[J].煤矿安全,2008,39(12):79-82Chen D L,Chen Y.Discussion on coal seam gas con-tent determination methods in china[J].Safety inCoal Mines,2008,39(12):79-82
[10]潘一山,唐巨鹏,李成全.煤层中气水两相运移的NMRI试验研究[J].地球物理学报,2008,51(5):1620-1626Pan Y S,Tang J P,Li C Q.NMRI test on two-phasetransport of gas-water in coal seam[J].ChineseJournal of Geophysics,2008,51(5):1620-1626
[11]周世宁,林柏泉.煤层瓦斯赋存与流动理论[M].北京:煤炭工业出版社,1999:137-139Zhou S N,Lin B Q.The theory of gas flow and stor-age in coal seams[M].Beijing:China Coal IndustryPublishing House,1999:137-139
[12]田靖安,王亮,程远平,等.煤层瓦斯压力分布规律及预测方法[J].采矿与安全工程学报,2008,25(4):481-485Tian J A,Wang L,Cheng Y P,et al.Research ondistribution rule and forecase method of gas pressurein coal seam[J].Journal of Mining&Safety Engi-neering,2008,25(4):481-485
[13]芦俊,王赟,石瑛.利用多波地震与测井数据联合反演预测煤岩的坚固性[J].地球物理学报,2011,54(11):2967-2972Lu J,Wang Y,Shi Y.Coal hardness prediction usingjoint inversion of multi-wave seismic data and log-ging[J].Chinese Journal of Geophysics,2011,54(11):2967-2972
[14]孟召平,苏永华.沉积岩体力学理论与方法[M].北京:科学出版社,2006:162-165Meng Z P,Su Y H.Sedimentary rock mechanics the-ory and methods[M].Beijing:Science Press,2006:162-165
[15]石瑛,王赟,芦俊.煤田地震多属性分析技术的应用[J].煤炭学报,2008,33(12):1397-1402Shi Y,Wang Y,Lu J.Application of seismic multi-attribute analysis technique in coal field[J].Journalof China Coal Society,2008,33(12):1397-1402
[16]赵群,郝守玲.煤样的超声速度和衰减各向异性测试实例[J].地球物理学进展,2006,21(2):531-534Zhao Q,Hao S L.Anisotropy test instance of ultra-sonic velocity and attenuation of coal sample[J].Progress in Geophysics,2006,21(2):531-534
[17]刘斌,席道瑛,葛宁洁,等.不同围压下岩石中泊松比的各向异性[J].地球物理学报,2002,45(6):880-890Liu B,Xi D Y,Ge N J,et al.Anisotropy of poissonsratio in rock samples under confining pressures[J].Chinese Journal of Geophysics,2002,45(6):880-890
[18]傅雪海,吴桁,权彪,等.淮南潘谢深部煤层含气预测[C]//中国煤炭学会煤层气专业委员会,中国石油学会石油地质专业委员会.2008年煤层气学术研讨会论文集.北京:地质出版社,2008:151-157Fu X H,Wu H,Quan B,et al.Prediction of gas con-tent in deep coalbeds at Panxie area of Huainancoalfield[C]//Coalbed Methane Specialized Com-mittee of the China Coal Society,Petroleum GeologySpecialized Committee of the Chinese Petroleum So-ciety.2008 Coalbed Methane Symposium Proceed-ings.Beijing:Geological Publishing House,2008:151-157
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