Abstract：For model-based inversion methods, a reasonable initial model can not only compensate for the mis- sing low-frequency seismic information but also improve the accuracy and stability of seismic inversion. Ho- wever, in areas with no or few wells,geophysical inversion is faced with the problem of lack of data and low data quality, which makes it difficult to obtain abundant low-frequency information directly from the well data. Therefore, obtaining a low-frequency model is the key to geophysical inversion and reservoir characterization in the well-free area. In view of this, a complex frequency domain seismic inversion method for a well-free area based on a geological model is explored for the new exploration area. Firstly, by considering the influence of faults and referring to the seismic facies to guide the macro trend qualitatively, the relative change of the low frequency of the trace integral is integrated, and the geological and seismic data of the well-free area are fully used to provide reliable low-frequency information for the inversion of the well-free area. Then, the low-frequency information of seismic data is mined according to the complex frequency domain inversion, and the well-free initial model is used as the low-frequency model for the complex frequency domain inversion. The seismic blind wavelet is extracted according to the blind signal theory, and the well-free low-frequency model in the complex frequency domain can be obtained to supplement the low-frequency information, which can alleviate the problem of missing low-frequency components of the seismic inversion in the well-free area to a certain extent. Finally, the effect of the new method is tested by using the model and actual working area data. The results show that the elastic impedance curves of the well-free inversion in the complex frequency domain are well fitted with the borehole elastic impedance curves. Compared with the sparse pulse inversion results with well, although the local accuracy is slightly lower, the general trend and reservoir distribution characteristics of the well-free inversion results in complex frequency domain are basically consistent with those of the borehole inversion results, which proves the effectiveness of the proposed method in the well-free area.
KROODE F T,BERGLER S,CORSTEN C,et al.Broadband seismic data-The importance of low frequencies[J].Geophysics,2013,78(2):WA3-WA14.
[2]
HAMID H,PIDLISECKY A.Multitrace impedance inversion with lateral constraints[J].Geophysics,2015, 80(6):M101-M111.
[3]
TARANTOLA A.Inverse Problem Theory and Methods for Model Parameter Estimation[M].Society for Industrial and Applied Mathematics,Philadelphia,PA,United States,2005.
[4]
LI Kun,YIN Xingyao,ZONG Zhaoyun.Seismic multi-scale inversion in the frequency domain based on smooth model constraint[J].Oil Geophysical Prospecting,2016,51(4):760-768.李坤,印兴耀,宗兆云.利用平滑模型约束的频率域多尺度地震反演[J].石油地球物理勘探,2016,51(4):760-768.
[5]
ZHANG Jingsi,WANG Mingchen,LI Rui.The pre-stack without well elastic parameter inversion technique and its application[J].Chinses Journal of Engineering Geophysics,2013,10(1):66-70.张京思,王明臣,李瑞.叠前无井弹性参数反演技术及其应用[J].工程地球物理学报,2013,10(1):66-70.
[6]
TANG Zhiyuan,GUO Qingzheng,LIU Guochang.A well-absent seismic inversion method and its application on the early exploration of South Asia Indus basin reservoir[J].Computing Techniques for Geophysical and Geochemical Exploration,2018,40(3):324-329.唐志远,郭清正,刘国昌.一种无井反演方法在印度河盆地储层预测中的应用[J].物探化探计算技术,2018,40(3):324-329.
[7]
XU Yunxia,ZHANG Baojin,WEN Pengfei.The application research of high density velocity analysis inhydrate impedance inversion without log constrain[J].Computing Techniques for Geophysical and Geochemical Exploration,2016,38(4):540-545.徐云霞,张宝金,文鹏飞.高密度速度分析方法在水合物无井约束波阻抗反演中的应用研究[J].物探化探计算技术,2016,38(4):540-545.
[8]
LI Yuanping,YAN Chengzhi,LI Jie,et al.Application of well-free broadband seismic inversion technology on the description of gas hydrate orebody in Shenhu waters,South China Sea[J].China Offshore Oil and Gas,2019,31(1):51-60.李元平,颜承志,李杰,等.宽频地震无井反演技术在神狐海域天然气水合物矿体描述中的应用[J].中国海上油气, 2019,31(1):51-60.
[9]
YANG Ruizhao,LI Songnan,Wang Yuanyuan,et al.Application of inversion without well constraint to hydrate forecasting in Shenhu area[J].Natural Gas Geoscience,2012,23(4):784-790.杨瑞召,李松楠,王媛媛,等.无井约束反演在神狐海域水合物预测中的应用[J].天然气地球科学,2012, 23(4):784-790.
CAO Shuhong,CHEN Jingbo.Studies on complex frequencies in frequency domain full waveform inversion[J].Chinese Journal of Geophysics,2014,57(7):2302-2313.曹书红,陈景波.频率域全波形反演中关于复频率的研究[J].地球物理学报,2014,57(7):2302-2313.
[12]
LI Huaiyi,WANG Xin,JIANG Jianhong,et al.Research on the method of well-free cascade inversion[J].Computing Techniques for Geophysical and Geochemical Exploration,2021,43(2):147-153.李怀懿,王新,江建虹,等.无井地震梯次反演方法研究[J]. 物探化探计算技术,2021,43(2):147-153.
LIU Libin,ZHOU Xiaoping,WEI Qing,et al.Techno-logy and application of seismic signal harmonic prediction extension processing for small scale geological target body[J].Computing Techniques for Geophysical and Geochemical Exploration,2020,42(4):460-467.刘立彬,周小平,魏庆,等.面向小尺度地质目标体的地震信号谐波预测拓频技术及应用[J].物探化探计算技术,2020,42(4):460-467.
JI Huancheng,WANG Jiang,LIU Hechong,et al.Application of bidirectional extension frequency high-resolution seismic technique in Wuxia fault zone[J].Progress in Geophysics,2022,37(1):201-212.季焕成,王江,刘荷冲,等.双向拓频高分辨率地震技术在乌夏断裂带的应用[J].地球物理学进展,2022,37(1):201-212.
[18]
HU Ying,ZHANG Dong,YUAN Jianzheng,et al.An efficient multi-scale waveform inversion method in Laplace-Fourier domain[J].Petroleum Exploration and Development,2015,42(3):338-346.胡英,张东,袁建征,等.Laplace-Fourier域多尺度高效全波形反演方法[J].石油勘探与开发,2015,42(3):338-346.
[19]
SHIN C, KOO N H, CHA Y H, et al. Sequentially ordered single-frequency 2-D acoustic waveform inversion in the Laplace-Fourier domain[J].Geophysical Journal International, 2010,181(2):935-950.
[20]
LI K,YIN X,ZONG Z.Bayesian seismic multi-scale inversion in complex Laplace mixed domains[J].Petroleum Science,2017,14(4):694-710.
[21]
ZONG Z, LI K,YIN X, et al.Broadband seismic amplitude variation with offset inversion[J].Geophysics,2017,82(3):M43-M53.
[22]
ZONG Z,WANG Y,LI K,et al.Broadband seismic inversion for low-frequency component of the model parameter[J].IEEE Transactions on Geoscience and Remote Sensing,2018, 56(9):5177-5184.
[23]
陆基孟.地震勘探原理(上册)[M].山东东营:石油大学出版社, 1996.
[24]
ZHANG Junhua,HOU Jing,XIN Xing,et al.Theory annotation and application of trace integration attribute in the prediction of thin channel sand body[J].Progress in Geophysics,2018,33(1):326-333.张军华,侯静,辛星,等.道积分属性理论诠释及其在薄河道砂体预测中的应用[J].地球物理学进展,2018,33(1):326-333.
[25]
GONG Ting,WANG Zhaolei,GU Xiaodi,et al.Broadband seismic data matching processing[J].Oil Geophysical Prospecting,2016,51(3):457-466.公亭,王兆磊,顾小弟,等.宽频地震资料处理配套技术[J].石油地球物理勘探,2016,51(3):457-466.
[26]
ZHANG Baojin,PENG Ke,CHENG Gu,et al.Optimization of broadband seismic wavelets from the perspective of octaves[J].Oil Geophysical Prospecting,2022,57(2):297-302.张宝金,彭科,成谷,等.倍频视角的宽频地震子波优化[J].石油地球物理勘探,2022,57(2):297-302.
LI K,YIN X,ZONG Z.Resolution enhancement of Robust Bayesian pre-stack inversion in the frequency domain[C].Extended Abstracts of 78th EAGE Confe-rence & Exhibition,2016,DOI:https://doi.org/10.3997/2214-4609.201601430.
