番禺4洼古近系储层叠前反演预测技术研究  

Pre-stack inversion for prediction of the Paleogene reservoirs in the Panyu 4 Sag

作　　者：张振波 刘灵 刘道理 杨登锋 ZHANG Zhen-Bo;LIU Ling;LIU Dao-Li;YANG Deng-Feng(Shenzhen Branch of CNOOC,Shenzhen 518054,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518054

出　　处：《物探与化探》2025年第2期312-320,共9页Geophysical and Geochemical Exploration

基　　金：中国海油石油有限公司“十四五”重大科技项目“海上深层/超深层油气勘探技术”(KJGG2022-0403)。

摘　　要：针对少井且构造沉积双复杂的古近系地层,为了提高储层反演精度,首先在地震资料处理时,采用稀疏脉冲反演一次波估算和各向异性Q叠前深度偏移两项关键技术,提高了地震道集质量和成像品质,然后采用叠前同时反演方法开展研究工作。方法步骤如下:①使用叠加速度,通过层约束Dix反演获得纵波阻抗低频模型;②使用分角度叠加数据和经过井震标定的子波进行弹性阻抗反演,得到远、中、近道弹性阻抗体;③通过Fatti反演,获得初始纵波阻抗、初始横波阻抗和初始密度;④开展叠前同时反演,获得最终的纵波阻抗、横波阻抗和密度;⑤利用岩性和物性反演结果,预测储层展布范围。该方法基于三维地震数据驱动,且对测井依赖程度低,可为类似地质条件下的储层预测工作提供借鉴。To improve the inversion accuracy of reservoirs in the Paleogene strata with limited wells and sedimentary and structural complexity,two key technologies were used in seismic data processing:sparse pulse inversion for primary wave estimation and anisotropic Q-pre-stack depth migration(PSDM).This contributed to improved quality of seismic gathers and imaging.Then,the pre-stack simultaneous inversion method was applied as follows:(1)Stacking velocity and layer-constrained Dix inversion were employed to obtain a low-frequency model of P-wave impedance;(2)Elastic impedance inversion was performed using angle-stacked data and well-calibrated wavelets,yielding far,medium,and near elastic impedance;(3)Initial P-and S-wave impedance,as well as initial density,were obtained through Fatti inversion;(4)Pre-stack simultaneous inversion was performed to obtain the final P-and S-wave impedance and density;(5)Lithology and physical property inversion results were used to predict the reservoir distribution range.This method,driven by three-dimensional seismic data and exhibiting low dependence on logs,can serve as a reference for reservoir prediction under similar geological settings.

关 键 词：储层预测 Dix反演 建模精度 弹性阻抗反演 Fatti反演 叠前同时反演 

分 类 号：P631.4[天文地球—地质矿产勘探]