Methodology to feasibility and 4D interpretation support in a pre-salt carbonate reservoir

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Applied Geophysics Pub Date : 2026-02-01 Epub Date: 2025-11-21 DOI:10.1016/j.jappgeo.2025.106035

Evângela P.A. da Silva , Alessandra Davólio , Marcos Sebastião dos Santos , Denis José Schiozer

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引用次数: 0

Abstract

Discovered in 2006 and with a current production of almost 70 % of hydrocarbons produced in Brazil, pre-salt carbonates are of great interest for 4D seismic analysis. 4D feasibility studies help to understand how production influences the 4D seismic response. We developed a workflow to obtain seismic amplitude data from a simulation model and then access estimated 4D attributes through a fast-track inversion procedure. Our aim was to understand the effect of dynamic changes (pressure and saturation) in 4D seismic attributes considering the challenges regarding carbonate reservoirs under a water alternation gas (WAG) production strategy, using a pre-salt like case. We also compared inverted 4D attributes with those obtained by petro-elastic modeling and with simulator data to evaluate the reliability of a fast-track inversion procedure.

The study showed that 4D positive amplitude anomalies are observed in the water alternation gas injectors regions, due to water replacing oil. These anomalies were also observed after 4D inversion, with the best results presented by ΔAI and ΔS_w. The application of the fast-track inversion method for 4D data is a viable alternative for those looking to perform a first qualitative analysis of 4D data quickly, but your limitations must be considered to avoid misinterpretations.

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盐下碳酸盐岩储层可行性及四维解释支持方法

该油藏发现于2006年，目前产量占巴西油气产量的近70%，盐下碳酸盐岩对四维地震分析具有重要意义。四维可行性研究有助于了解生产如何影响四维地震反应。我们开发了一套工作流程，从模拟模型中获取地震振幅数据，然后通过快速反演程序获得估计的四维属性。我们的目标是了解动态变化（压力和饱和度）对四维地震属性的影响，考虑到在水交替气（WAG）生产策略下碳酸盐岩储层的挑战，使用盐下样例。我们还将反演的四维属性与石油弹性建模和模拟器数据进行了比较，以评估快速通道反演程序的可靠性。研究表明，在水交替注气区，由于水置换油，出现了四维正幅异常。这些异常在4D反演后也能观测到，以ΔAI和ΔSw的结果最好。对于那些希望快速对四维数据进行第一次定性分析的人来说，应用快速通道反演方法是一种可行的选择，但必须考虑到您的局限性，以避免误解。

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来源期刊

Journal of Applied Geophysics 地学-地球科学综合

CiteScore

3.60

自引率

10.00%

发文量

274

审稿时长

4 months

期刊介绍： The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.