基于相干约束的页岩裂缝OVT地震预测方法研究及应用  

Research and application of OVT seismic prediction method for shale fractures based on coherence constraints

作　　者：程晓艳 胡曦 罗颖[2] 李亚丁 高培丞 谢伟 戴赟 佟恺林 张奎 王群武 CHENG Xiaoyan;HU Xi;LUO Ying;LI Yading;GAO Peicheng;XIE Wei;DAI Yun;TONG Kailin;ZHANG Kui;WANG Qunwu(Sichuan Shale Gas Exploration and Development Co.,Ltd.,Chengdu 610051,China;Geological Exploration and Development Research Institute,Chuanqing Drilling Engineering Co.,Ltd.,Chengdu 610051,China;Beijing Precise Energy Technology Co.,Ltd.,Beijing 100085,China)

机构地区：[1]四川页岩气勘探开发责任有限公司,四川成都610051 [2]川庆钻探工程有限公司地质勘探开发研究院,四川成都610051 [3]北京普瑞斯安能源科技有限公司,北京100085

出　　处：《断块油气田》2023年第6期982-990,共9页Fault-Block Oil & Gas Field

摘　　要：页岩中裂缝发育和分布的准确刻画对页岩地层压裂方案设计及水平井布置具有决定性的作用。文中在研究页岩裂缝特征的基础上,提出了基于相干约束的页岩裂缝OVT地震预测方法,并以此为基础实现了裂缝参数的有效预测。首先,分析地震相干属性和页岩裂缝分布的关系;然后,通过概率化地震相干属性,建立基于相干约束的裂缝参数目标函数;最后,通过求取目标函数,获取相干约束下的裂缝参数反演结果。与常规方法反演结果对比发现,基于相干约束的裂缝参数反演方法,有效提高了反演结果的分辨率和可靠性,裂缝预测结果与井的裂缝发育区更加吻合。这证明了该方法的有效性。The accurate description of fracture development and distribution in shale is of great significance to fracturing design in shale formations and the layout of horizontal wells.On the basis of analyzing the characteristics of shale fractures,an OVT seismic prediction method for shale fractures based on coherence constraints is proposed,and based on this,the effective prediction of fracture parameters is realized.First,the relationship between seismic coherence attributes and shale fractures distribution is analyzed.Then,the objective function of fracture parameters based on coherence constraints is established by probabilistic seismic coherence properties.Finally,by calculating the objective function,the inversion results of fracture parameters under coherence constraints are obtained.By comparing with the inversion results of conventional methods,it is shown that the resolution and reliability of the inversion results are effectively improved by the fracture parameter inversion method based on coherence constraints,and the fracture prediction results are more consistent with the well fracture development area,which demonstrates the effectiveness of the method.

关 键 词：页岩储层 OVT地震 相干属性 裂缝预测 

分 类 号：TE132.1[石油与天然气工程—油气勘探]