番禺4洼古近系储层叠前反演预测技术研究

doi:10.11720/wtyht.2025.1265

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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。

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	张振波
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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

Abstract：

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.

Key words： reservoir prediction Dix inversion modeling accuracy elastic impedance inversion Fatti inversion pre-stack simultaneous inversion

收稿日期: 2024-06-26 修回日期: 2024-11-05 出版日期: 2025-04-20

ZTFLH:

P631.4

基金资助: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)

作者简介: 张振波(1973-),男,正高级工程师,主要从事海上地震采集及资料处理解释工作。

引用本文:

张振波, 刘灵, 刘道理, 杨登锋. 番禺4洼古近系储层叠前反演预测技术研究[J]. 物探与化探, 2025, 49(2): 312-320.
ZHANG Zhen-Bo, LIU Ling, LIU Dao-Li, YANG Deng-Feng. Pre-stack inversion for prediction of the Paleogene reservoirs in the Panyu 4 Sag. Geophysical and Geochemical Exploration, 2025, 49(2): 312-320.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2025.1265 或 https://www.wutanyuhuatan.com/CN/Y2025/V49/I2/312

Fig.1 过P6井基于地质框架插值的纵波阻抗模型

Fig.2 叠前同时反演流程

Fig.3 岩石物理约束下的人工智能储层定量预测技术

Fig.4 过P6井的层约束Dix反演结果

Fig.5 过P6井不同角度弹性阻抗反演剖面

Fig.6 过P6井初始反演剖面

Fig.7 过P6井最终反演剖面

Fig.8 不同方法得到的纵波阻抗反演结果对比

Fig.9 番禺地区密度与纵波阻抗交会图

Fig.10 叠前反演结果与测井曲线对比

Fig.11 文昌组储层总厚度

Fig.12 地层岩性与储层物性反演结果

Fig.13 文昌组优质储层总厚度图与孔隙度反演剖面

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