中国科学院力学研究所林缅的最新研究揭示了致密砂岩油动态运移机理数值模拟以及饱和度预测。该研究于2023年12月15日发表于国际一流学术期刊《中国科学：地球科学》杂志上。

研究人员建立了包含多个基本地质要素的概念模型和致密砂岩油运移成藏的非线性渗流数值模型。研究考虑了滑移效应、超压驱动力、浮力和毛细力对致密油运移和聚集的影响。结果显示：(1)致密储层与常规储层在油气运移和聚集方面的差异体现在含油饱和度的增长方式、油水分布特征和地层倾角是影响程度上；(2)当平均孔喉半径小于150 nm时，滑移效应影响显著，超压驱动力和毛细力是控制致密砂岩油气运移聚集的主要力学机制，而浮力、毛细管力和超压驱动力的耦合作用控制着含油饱和度的上下限。

最后，研究提出了一种快速预测致密砂岩含油饱和度的量纲和无量纲识别图，并结合实测数据进行了验证。该研究为分析致密砂岩油运移聚集机理提供了依据，为预测含油饱和度提供了新途径。此外，该研究组还开发了对油气运移结果进行分析的数字化和可视化分析方法，丰富了油气成藏动态的表达。

据研究人员介绍，致密砂岩油气运移和聚集定量表征是油气勘探领域的一个新兴研究前沿。

附：英文原文

Title: Numerical simulation of the dynamic migration mechanism and prediction of saturation of tight sandstone oil

Author: Gaohui CAO, Mian LIN, Likuan ZHANG, Lili JI, Wenbin JIANG

Issue&Volume: 2023-12-15

Abstract: Quantitative characterization of tight sandstone oil migration and accumulation is an emerging research frontier in the field of oil and gas exploration. In this study, a conceptual model containing multiple basic geological elements is developed, and a nonlinear seepage numerical model for tight sandstone oil migration and accumulation is established. The effects of the slip effect, overpressure driving force, buoyancy, and capillary force on the migration and accumulation of tight oil are examined. The results showed that (1) the differences in oil migration and accumulation between tight and conventional reservoirs are reflected in the growth mode of oil saturation, distribution characteristics of oil and water, and extent of the effect of the formation dip angle; (2) the slip effect has a significant impact when the average pore throat radius is less than 150nm and the overpressure driving force and capillary force are the main mechanical mechanisms controlling oil migration and accumulation in tight sandstone, while the coupling effect of buoyancy, capillary force, and overpressure driving force controls the upper and lower limits of oil saturation. Finally, a dimensional and dimensionless identification chart for rapidly predicting the oil saturation of tight sandstone is proposed and verified using the measured data. This study provides a basis for analyzing the migration and accumulation mechanisms of tight sandstone oil and a new approach for predicting oil saturation. Additionally, we developed digital and visual analysis methods for the migration results, enriching the expression of the dynamics of hydrocarbon accumulation.

DOI: 10.1007/s11430-023-1202-1

Source: https://www.sciengine.com/10.1007/s11430-023-1202-1