鄂尔多斯盆地海子塌地区长6油层组测井曲线标准化研究
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摘要
研究区延长组沉积为陆相三角洲沉积,主要含油气层位为长6油层组.受沉积环境及泥岩中有机质含量的影响,该区非渗透层段测井曲线响应差异较大,使得测井曲线标准化效果不佳.针对此情况,在借助自然伽马、井径测井、声波测井、感应测井等曲线构建"视标准层"的基础上,利用ΔlgR方法剔除受有机质影响明显的非渗透层段,进而选取不受井眼条件、岩性、物性、含油气性等因素影响的非渗透层段作为"视标准层",最后采用直方图法对研究区测井曲线进行标准化,并结合孔隙度计算模型进行了检验.研究结果表明,ΔlgR方法可以较为有效地消除非渗透层段有机质含量的影响,提高陆相地层中"视标准层"构建的质量,为后期储层参数的确定奠定基础.
The Yanchang Formation is derived from continental delta facies in Ordos Basin with C-6 oil-bearing formation as the main reservoir. During the normalization of log curves,the log responses of non-permeable layer are quite different due to the influence of sedimentary environment and organic content in mudstone,which eventually leads to the lack of marker layer with stable log responses. Under this situation,on the basis of the construction of virtual marker bed by means of curves like gamma ray,caliper logging,acoustic logging and induction logging,the Δlg R method is used to remove the impact of organic matter in non-permeable layers,and then to select a "virtual marker bed"unaffected by borehole conditions,lithology,physical properties and oil-gas potential. Finally,the histogram translation is applied in normalization of logging curves followed by test with the porosity-calculated model. The results show that the Δlg R method is an effective way to eliminate the effect of organic content in non-permeable layer and to improve the construction quality of the"virtual marker bed"in continental strata,which also lays foundation for later determination of reservoir parameters.
The Yanchang Formation is derived from continental delta facies in Ordos Basin with C-6 oil-bearing formation as the main reservoir. During the normalization of log curves,the log responses of non-permeable layer are quite different due to the influence of sedimentary environment and organic content in mudstone,which eventually leads to the lack of marker layer with stable log responses. Under this situation,on the basis of the construction of virtual marker bed by means of curves like gamma ray,caliper logging,acoustic logging and induction logging,the Δlg R method is used to remove the impact of organic matter in non-permeable layers,and then to select a "virtual marker bed"unaffected by borehole conditions,lithology,physical properties and oil-gas potential. Finally,the histogram translation is applied in normalization of logging curves followed by test with the porosity-calculated model. The results show that the Δlg R method is an effective way to eliminate the effect of organic content in non-permeable layer and to improve the construction quality of the"virtual marker bed"in continental strata,which also lays foundation for later determination of reservoir parameters.
引文
[1]雍世和,张超谟.测井数据处理与综合解释[M].东营:中国石油大学出版社,1996:442-449.
[2]Neinast G S,Knox C C.Normalization of well log data[C]//SPWLA14th Annual Logging Symposium.Society of Petrophysicists and WellLog Analysts,1973.
[3]Patchett J G,Coalson E B.The Determination of porosity in sandstones and shaly sandstones:Part One—Quality Control[C]//SPWLA 20th Annual Logging Symposium.Society of Petrophysicists and Well-Log Analysts,1979.
[4]Bornemann E,Doveton J H.Log normalization by trend surface analysis[J].The Log Analyst,1981,22(4):3-8.
[5]Shier D E.Well log normalization:Methods and guidelines[J].Petrophysics,2004,45(3):268-280.
[6]王志章,熊琦华,宋杰英.测井资料标准化及应用效果[J].测井技术,1993,17(6):453-461,473.
[7]王志章,熊琦华,宋杰英.标准层的构成与测井资料数据标准化[J].石油大学学报:自然科学版,1995,19(1):13-17.
[8]肖佃师,卢双舫,陈海峰,等.基于频谱分解的测井曲线标准化方法[J].石油与天然气地质,2013,34(1):129-136.
[9]宋泽章,姜振学,原园,等.“相控”测井曲线标准化及其应用——以鄂尔多斯盆地下寺湾地区延长组湖相泥页岩TOC评价为例[J].中国矿业大学学报,2016,45(2):310-318.
[10]熊琦华,王志章,曾文冲.牛庄洼陷万全油田测井资料数据标准化[J].石油大学学报:自然科学版,1991,15(3):28-35.
[11]蔡忠,信荃麟.油气田测井数据标准化方法研究[J].地质论评,1993,39(4):371-377.
[12]赖泽武,张一伟,熊琦华,等.具有趋势的克里格方法在测井资料数据标准化中的应用[J].石油勘探与开发,1999,26(6):1-10,91-94.
[13]欧阳健,王贵文,吴继余,等.测井地质分析与油气层定量评价[M].北京:石油工业出版社,1999:66-71.
[2]Neinast G S,Knox C C.Normalization of well log data[C]//SPWLA14th Annual Logging Symposium.Society of Petrophysicists and WellLog Analysts,1973.
[3]Patchett J G,Coalson E B.The Determination of porosity in sandstones and shaly sandstones:Part One—Quality Control[C]//SPWLA 20th Annual Logging Symposium.Society of Petrophysicists and Well-Log Analysts,1979.
[4]Bornemann E,Doveton J H.Log normalization by trend surface analysis[J].The Log Analyst,1981,22(4):3-8.
[5]Shier D E.Well log normalization:Methods and guidelines[J].Petrophysics,2004,45(3):268-280.
[6]王志章,熊琦华,宋杰英.测井资料标准化及应用效果[J].测井技术,1993,17(6):453-461,473.
[7]王志章,熊琦华,宋杰英.标准层的构成与测井资料数据标准化[J].石油大学学报:自然科学版,1995,19(1):13-17.
[8]肖佃师,卢双舫,陈海峰,等.基于频谱分解的测井曲线标准化方法[J].石油与天然气地质,2013,34(1):129-136.
[9]宋泽章,姜振学,原园,等.“相控”测井曲线标准化及其应用——以鄂尔多斯盆地下寺湾地区延长组湖相泥页岩TOC评价为例[J].中国矿业大学学报,2016,45(2):310-318.
[10]熊琦华,王志章,曾文冲.牛庄洼陷万全油田测井资料数据标准化[J].石油大学学报:自然科学版,1991,15(3):28-35.
[11]蔡忠,信荃麟.油气田测井数据标准化方法研究[J].地质论评,1993,39(4):371-377.
[12]赖泽武,张一伟,熊琦华,等.具有趋势的克里格方法在测井资料数据标准化中的应用[J].石油勘探与开发,1999,26(6):1-10,91-94.
[13]欧阳健,王贵文,吴继余,等.测井地质分析与油气层定量评价[M].北京:石油工业出版社,1999:66-71.