基于压缩子波的碳酸盐岩薄储层孔隙度反演方法应用——以M油田为例  

Application of Porosity Inversion Method in Thin Carbonate Reservoirs with Compression Wavelet:A Case Study of M Oilfield

作　　者：饶溯 曹树春 陈培元 李春鹏 张树林 曹向阳 RAO Su;CAO Shu-chun;CHEN Pei-yuan;LI Chun-peng;ZHANG Shu-lin;CAO Xiang-yang(CNOOC International Energy Services(Beijing)Co.LTD,Beijing 100028,China)

机构地区：[1]中海石油国际能源服务(北京)有限公司,北京100028

出　　处：《科学技术与工程》2023年第15期6385-6392,共8页Science Technology and Engineering

基　　金：国家科技重大专项(2017ZX05032-003,2017ZX05032-004)。

摘　　要：由于油田开发程度的不断加深及地震资料分辨率偏低的限制,常规波阻抗反演方法很难满足油田精细开发对储层描述的要求。M油田为碳酸盐岩礁滩相储层,上覆巨厚膏盐层广泛发育,深层目的层地震主频衰减较快、频带较窄,部分储层段较薄也低于地震分辨率,且井壁垮塌现象普遍存在。针对上述难题,应用压缩地震子波方法提高地震分辨率,引入神经网络方法修正井垮塌段密度曲线。最终,综合井点及地震波阻抗信息,采用“井-震”波形类比方法实现了对薄储层孔隙度的预测。相比常规方法,该方法首次应用于礁滩相碳酸盐岩薄储层的预测,显著改善薄储层段的地震分辨率,并充分结合了地震和测井的波形信息,提高了孔隙度反演精度,揭示了储层纵横向展布规律,指导了M油田储量复算及薄储层段的新井部署实施。Due to the continuous deepening of oilfield development degree and the limitation of low resolution of seismic data,general elastic impedance inversion method has been unable to meet the needs of reservoir description for oilfield fine development.The M oilfield is a carbonate reef-shoal reservoir with the extensive development of the overlying anhydrite salt layer,the fast attenuation of seismic main frequency and narrow seismic frequency band in deep target layer,part of the reservoirs are thin and lower than seismic resolution,and the phenomenon of hole sloughing is common.According to those problems,the compression seismic wavelet technology was innovatively used to improve seismic resolution and the neural network technology was introduced to correct the density curve of hole sloughing section in the paper.Finally,the waveform analogy technology of wells and seismic was used to realization of the thin reservoir porosity prediction.Compared with general methods,this method was first applied to the prediction of thin carbonate reef-shoal reservoir,which significantly improved the seismic resolution of the thin reservoir and maken full use of seismic and logging information,that could improve the accuracy of porosity inversion,revealed the regularity of vertical and horizontal distribution of reservoir,and guided the reserve calculation of M oilfield and the implementation of new well deployment in the thin reservoir.

关 键 词：碳酸盐 薄储层 压缩地震子波 神经网络 “井-震”波形类比 

分 类 号：P631[天文地球—地质矿产勘探] TE19[天文地球—地质学]