数字岩心等效弹性参数模拟研究进展

Progress of effective elastic parameter simulation on digital rock

弹性波在含流体岩石中的传播速度和衰减是油气勘探领域的重要研究内容之一.物理实验与经验关系,理论模型,数值模拟是研究速度和衰减的三种重要方法.从20世纪90年代开始,基于数字岩心的等效弹性参数模拟逐渐发展起来,形成了以有限元静力学模拟,透射波模拟,动态应力应变模拟和准静态应力应变模拟为主的4类模拟方法.它们不但可以计算低频和高频速度,也能计算跨频段的频散和衰减曲线,还能分析数字岩心内部的应力(压力)场和应变场.这对完善理论模型、优化岩石物理建模流程具有重要的指导作用.当前,人工智能技术进入快速发展时期,数字岩心等效弹性参数模拟可以与人工智能结合,提高油气勘探与开发的效率.

Velocity and attenuation of elastic waves in fluid saturated rocks are important research contents in oil and gas exploration.Physical experiment and empirical relationship,theoretical model,numerical simulation are three methods to study the velocity and attenuation.Since the 1990s,simulation on digital rock for effective elastic parameters is developed.Finite element static simulation,transmission wave simulation,dynamic stressstrain simulation and quasi-static stress-strain simulation are four main types of simulation.They can not only calculate the low and high frequency velocity,but also compute dispersion and attenuation across broad frequency bands,in addition to analyze the stress(pressure)and strain field inside the digital rocks.Simulations on digital rock play an important role in completing the theoretical model and optimizing the rock physics modeling process.With the fast development of artificial intelligence,the effective elastic parameter simulation on digital rock combined with the artificial intelligence will improve the efficiency of oil and gas exploration and exploration.