叠前弹性参数反演在龙马溪组页岩脆性预测中的应用  

Application of pre-stack elastic parameter inversion in the prediction of Longmaxi formation shale's brittleness

作　　者：韩向义 阎建国[1] 朱斗星 姚佳芮 王弘扬 HAN Xiangyi;YAN Jianguo;ZHU Douxing;YAO Jiarui;WANG Hongyang(Chengdu University of Technology State Key Laboratory of Geology and Exploitation,Oil and Gas Reservoir Chengdu,610059,China;BGP Research Institute,Zhuozhou 072751,China)

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059 [2]东方地球物理公司研究院,涿州072751

出　　处：《物探化探计算技术》2018年第3期337-344,共8页Computing Techniques For Geophysical and Geochemical Exploration

摘　　要：页岩气储层的可压裂性对其研究开发影响很大,脆性是评价可压裂性的重要指标,进行页岩气储层脆性预测,可以为水平井设计和压裂工艺提供技术方案。目前页岩气储层脆性评价的主要方法是取心矿物分析法、测井解释脆性评价法、叠前地震资料反演法等方法。前两种方法只能够根据测井解释资料获取纵向上的脆性信息,而横向展布规律难以评价,叠前地震资料反演技术可以获得页岩气储层横向上的脆性展布规律,有利于设计良好的水平井。这里以川南地区龙马溪组页岩气储层为载体,通过分析测井取心脆性矿物含量和岩石物理参数优选,确定了脆性的评价标准及地震评价参数,通过叠前弹性参数反演获得龙马溪组页岩储层的弹性参数体,按照评价标准和评价参数得到龙马溪组页岩脆性的空间分布特征,从而为水平钻井提供技术保障,有助于页岩气储层的"甜点"评价。通过与已知区的对比,说明预测效果较好,所提出的方法和流程具有较强的应用价值和推广价值。The fracturing of shale gas reservoir has a great influence on its research and development,while brittleness is an important index to evaluate fracturing,therefore,the prediction of shale gas reservoir＇s brittleness can provide technical solutions for horizontal well＇s design and fracturing technology.At present,the main methods to evaluate the brittleness of shale gas reservoir are：coring mineral analysis,logging interpretation brittleness evaluation,pre-stack seismic data inversion and so on.The first two methods can be used to obtain the longitudinal brittle information according to the logging interpretation data,and it is difficult to evaluate the horizontal distribution law of shale gas reservoir,but which can be shown by pre-stack seismic data inversion.They are helpful to design good horizontal well.Taking Longmaxi formation in south Sichuan as the research object,the evaluation criteria of brittleness and seismic evaluation parameters were determined,through the analysis of the content of logging coring brittle minerals and the optimization of petrophysical parameters;the elastic parameters of Longmaxi formation shale reservoir were obtained through pre-stack elastic parameter evaluation parameters,which can provide technical support for horizontal drilling and help to evaluate high quality shale reservoir.Compared with the known area,the prediction effect was better.The proposed method and process have strong application value and promotion value.

关 键 词：叠前反演 页岩气储层 脆性预测 水平井 

分 类 号：P631.4[天文地球—地质矿产勘探]