地应力预测方法在川南地区大寨页岩气田的应用
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摘要
针对川南大寨地区页岩气储层三维地应力预测的需求,建立基于横向各向同性介质的Suárez-Rivera地应力计算模型,进行三维空间地应力预测。计算结果表明:Suárez-Rivera横向各向同性介质地应力模型计算结果与单井地应力评价结果高度吻合,模型预测的最小水平主应力与压裂施工地层瞬时闭合压力一致,证实了该方法在川南大寨地区页岩地应力预测中的可靠性。该方法的成功应用,为川南地区页岩气地应力评价提供了理论支持,预测结果对后续页岩气的井位部署和压裂参数设计具有一定的指导意义。
In order to predict the 3D shale gas reservoir geo-stress in the Dazhai shale gasfield of Southern Sichuan,the Suárez-Rivera geo-stress calculation model based on lateral isotropy is established to predict 3D geo-stress.Calculation indicates that the calculation from the Suárez-Rivera geo-stress calculation model based on lateral isotropy is perfectly consistent with that of single-well geo-stress evaluation. The minimum horizontal principal stress predicted by this model is consistent with the instantaneous closing pressure during fracturing operation,which verify the reliability of this method in shale geo-stress prediction in the Dazhai shale gas field of Southern Sichuan. The successful application of this method could provider certain theoretical basis for the shale geo-stress evaluation in Southern Sichuan. The geo-stress prediction also can supply certain guidance for the subsequent shale gas well deployment and fracturing design.
In order to predict the 3D shale gas reservoir geo-stress in the Dazhai shale gasfield of Southern Sichuan,the Suárez-Rivera geo-stress calculation model based on lateral isotropy is established to predict 3D geo-stress.Calculation indicates that the calculation from the Suárez-Rivera geo-stress calculation model based on lateral isotropy is perfectly consistent with that of single-well geo-stress evaluation. The minimum horizontal principal stress predicted by this model is consistent with the instantaneous closing pressure during fracturing operation,which verify the reliability of this method in shale geo-stress prediction in the Dazhai shale gas field of Southern Sichuan. The successful application of this method could provider certain theoretical basis for the shale geo-stress evaluation in Southern Sichuan. The geo-stress prediction also can supply certain guidance for the subsequent shale gas well deployment and fracturing design.
引文
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[2]邓继新,王欢,周浩,等.龙马溪组页岩微观结构、地震岩石物理特征与建模[J].地球物理学报,2015,58(6):2123-2136.
[3]THIERCELIN M J,PLUMB R A. A core-based prediction of lithologic stress contrasts in east Texas formations[J].SPE Formation Evaluation,1994,9(4):251-258.
[4]HIGGINS S,GOODWIN S,DONALD A,et al. Anisotropic stress models improve completion design in the Baxter shale[C]. SPE115736,2008:321-329.
[5]戴荣,李仲奎.三维地应力场BP反分析的改进[J].岩石力学与工程学报,2005,24(1):83-87.
[6]侯明勋,葛修润.三维地应力计算模型研究[J].岩土力学,2007,28(10):2017-2021.
[7]赵小龙.基于支持向量机的深层地应力预测模型[J].特种油气藏,2016,23(1):139-141.
[8] EATON B A. The equation for geopressure prediction from well logs[C]. SPE5544,1975:1-11.
[9]樊洪海,张传进.复杂地层地层孔隙压力求取新技术[J].石油钻探技术,2005,33(5):40-43.
[10]刘晓峰,解习农.东营凹陷流体压力系统研究[J].地球科学——中国地质大学学报,2003,28(1):78-86.
[11]翟盼盼,张纪喜,赵洪.异常高压成因机制及其预测方法[J].内蒙古石油化工,2009,19(19):40-41.
[12]王越之,李自俊.横向各向同性地层地应力的研究[J].石油学报,1999,20(1):34-37.
[13]张广智,陈娇娇,陈怀震,等.基于页岩岩石物理等效模型的地应力预测方法研究[J].地球物理学报,2015,58(6):2012-2122.
[14]邓金根,陈峥嵘,耿亚楠,等.页岩储层地应力预测模型的建立和求解[J].中国石油大学学报(自然科学版),2013,37(6):59-64.