摘要
深层致密砂岩孔隙特征复杂,常规的岩石物理模型无法准确地表征其弹性参数的变化,因此基于岩石物理实验数据,利用Zimmerman提出的方法计算连续型孔隙纵横比谱,将Brie模型代入到喷射流模型中,考虑岩石软孔隙中非完全饱和流体的频散情况,通过含有孔隙纵横比谱的喷射流模型计算改进后的“干骨架”模量,采用中观尺度的White模型计算致密砂岩部分饱和流体的弹性参数,建立了一套适用于致密砂岩复杂孔隙结构的双尺度流变岩石物理模型,与常规岩石物理模型相比,预测的弹性参数精度更高,并以此为基础优选敏感弹性参数,建立频变岩石物理量版,结果与测井数据和实验室数据匹配良好,经过频率校正,地震频段量版能为致密储层预测提供地球物理依据。
The pore characteristics of deep tight sandstones are complex,and conventional rock physics models cannot accurately explain the changes in elastic parameters of tight sandstones.Therefore,based on petrophysical experimental data,the method proposed by Zimmerman is used to calculate the continuous pore aspect ratio spectrum.We substituted the Brie model into the jet flow model,taking into account the frequency disperse of not fully saturated fluid,in the soft pores of the rock,calculated the improved“dry skeleton”modulus through the jet flow model containing the pore aspect ratio spectrum,used the meso-scale White model to calculate the elastic parameters of tight sandstone partially saturated fluid,and established a set of two-scale rheological rock physics model suitable for the complex pore structure of tight sandstone.Compared with the conventional rock physics model,the predicted elastic parameters are more accurate.Based on this,the sensitive elastic parameters are optimized to establish frequency dependence rock physics template,the results match well with logging data and experimental data,and after frequency correction,the seismic frequency template can provide a geophysical basis for tight reservoir prediction.
作者
郭淑文
邢兴
国春香
周淑慧
龚艳春
陈泽良
于超
成亚斌
Guo Shuwen;Xing Xing;Guo Chunxiang;Zhou Shuhui;Gong Yanchun;Chen Zeliang;Yu Chao;Cheng Yabin(Research Institute of Exloration and Development,Dagang Oilfield of PetroChina,Tianjin 300280,China;East China Branch,Geophysical Company of Sinopec,Nanjing Jiangsu 210009,China)
出处
《工程地球物理学报》
2022年第3期276-284,共9页
Chinese Journal of Engineering Geophysics
基金
中国石油天然气股份有限公司重大科技专项(编号:2018E-11)。
关键词
岩石物理
双重孔隙
弹性参数
rock physics
dual porosity
elastic parameter
