摘要
随着砂岩型铀矿勘查工作的不断深入,到勘探阶段,需要精细刻画目标层砂体,查明砂体连通性。针对砂岩型铀矿目标层沉积具有砂-泥互层、砂体连续性差和规模小等特点,基于松辽盆地HLJ地区高精度三维地震资料,探索形成一套砂体识别关键技术。首先,应用包括叠前噪声压制、组合反褶积和叠前时间偏移等保真保幅高分辨处理技术提高资料的信噪比和分辨率;然后,通过测井资料岩石物理分析确定区分砂-泥岩的岩性敏感参数;最后,基于确定的岩性敏感参数(电阻率),应用多参数岩性反演技术精细刻画目标层砂体,处理解释的各环节共同构成砂体识别的关键技术。实际应用效果证明,对于砂-泥岩薄互层且砂-泥岩波阻抗存在叠置的情况,该方法能够提高砂体识别精度,具有一定的应用前景。
After intensive survey work for sandstone-type uranium deposits,it is necessary to finely characterize target sand body and determine the connectivity of sand body in exploration stage.In this paper,the key techniques were explored and formed for sand body identification based on high-precision 3D seismic data of HLJ region based on the feature of sandstone type uranium deposits of sandstone and mudstone interbedded,poor continuity,and small scale sand body.Firstly,high-resolution processing techniques including prestack noise suppression,combined deconvolution,and prestack time migration were applied to improve signal to noise ratio and resolution of data.Then,sensitive parameters of lithology were determined through rock physics analysis of logging data.Finally,multi-parameter lithology inversion was applied to effectively identify target sand body based on the sensitive lithologic parameters resistivity.The steps of processing and interpretation constitutes the key techniques for sand body identification.The practical application effect proved that established techniques was effective and feasible to identify the thin interbeded sandstone and mudstone in case of the acoustic impedance overlay of sandstone and mudstone,which are quite prospective in future application.
作者
宁媛丽
李金鑫
赵威
王若雯
朱圣伟
杨晓柳
NING Yuanli;LI Jinxin;ZHAO Wei;WANG Ruowen;ZHU Shengwei;YANG Xiaoliu(Aribore Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050002,China;CNNC Key Laboratory for Geophysical Exploration Technology Center of Uranium Resource,Shijiazhuang 050002,China;Hebei Key Laboratory of Airborne Survey and Remote Sensing Technology,Shijiazhuang 050002,China)
出处
《世界核地质科学》
CAS
2024年第6期1156-1167,共12页
World Nuclear Geoscience
基金
中国核工业地质局松辽盆地西南部地震地质建模研究项目(编号:202411-5)资助。
关键词
高精度三维地震勘探
砂岩型铀矿
砂体识别
保真保幅高分辨率处理
多参数岩性反演
high-precision 3D seismic exploration
sandstone-type uranium deposit
sand body identification
high-resolution processing with high fidelity and amplitude preservation
multi-parameter lithology inversion
