赵峦啸3,4,,,
王一戎3,4
1. 长江大学油气资源与勘探技术教育部重点实验室, 武汉 430100
2. 长江大学地球物理与石油资源学院, 武汉 430100
3. 同济大学海洋地质国家重点实验室, 上海 200092
4. 同济大学海洋与地球科学学院, 上海 200092
基金项目: 国家自然科学基金项目（41704117，41874124），中国科学院战略性先导科技专项（XDA14010203）资助
详细信息
作者简介: 朱伟, 男, 副教授, 主要从事地震勘探与岩石物理方面的教学和科研工作.E-mail: heathzhuwei@126.com
通讯作者: 赵峦啸, 男, 副教授, 主要从事岩石物理和储层地球物理方面的教学和科研工作.E-mail: zhaoluanxiao@tongji.edu.cn
中图分类号: P631收稿日期:2020-08-11
修回日期:2021-03-03
上线日期:2021-06-10
Digital rock-based broadband dynamic stress-strain simulation method and its applications for characterization of dispersion and attenuation signatures of tight cracked rock
ZHU Wei1,2,,ZHAO LuanXiao3,4,,,
WANG YiRong3,4
1. Key Laboratory of Exploration Technologies for Oil and Gas Resources(Ministry of Education), Yangtze University, Wuhan 430100, China
2. College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430100, China
3. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
4. School of Ocean and Earth Science, Tongji University, Shanghai 200092, China
More Information
Corresponding author: ZHAO LuanXiao,E-mail:zhaoluanxiao@tongji.edu.cn
MSC: P631--> Received Date: 11 August 2020
Revised Date: 03 March 2021
Available Online: 10 June 2021
摘要
摘要:利用数字岩石物理技术表征复杂非均质多孔岩石跨频段的频散和衰减特征对于综合利用多尺度的地球物理数据进行地层非均质性的刻画具有重要的意义.现有的描述波致流体流动引起的频散和衰减效应的数字岩心动态应力应变模拟方法主要为单频率模拟方法，需要在不同的频率进行多次模拟才能刻画频散和衰减特征.本文提出了宽频带动态应力应变模拟方法，通过给数字岩心加载一个快速趋于恒定的宏观应变，采用波场正演技术求解数字岩心内部流固耦合的应变场和应力场，模拟数字岩心内部的应力松弛过程，从而通过一次模拟计算目标频段范围内连续的频散和衰减曲线.该方法可以成功地用于刻画含裂隙致密岩石挤喷流效应引起的速度频散和衰减特征，并通过数值模拟较为系统地揭示致密地层中控制挤喷流效应的主控物理因素，这些认识也与现有挤喷流效应的理论模型有较好的吻合.
关键词: 数字岩心/
宽频带动态应力应变模拟/
频散/
衰减/
挤喷流
Abstract:Using digital rock physics technology to simulate and understand the dispersion and attenuation signautres of complex heterogeneous porous rocks at a broad frequency band is of great significance for reconciling multi-scale geophysical data for geological heterogeneities characterization. The existing dynamic stress-strain simulation method to simulate the dispersion and attenuation effect due to wave-induced fluid flow is mainly based on the single-frequency simulation method, which requires multiple simulations at different frequencies to fully obtain the dispersion and attenuation characteristics. Therefore, we propose the broadband dynamic stress-strain simulation method. By loading the digital rock with a macroscopic strain that quickly tends to be constant, and using the wave filed forward modeling technology to solve the strain-stress field of the coupled fluid-solid in the digital rock, mimicking the stress-relaxation process. Then, the dispersion and attenuation in a continuous frequency band are computed. We demonstrate that this developed method can successfully characterize the velocity dispersion and attenuation signature due to the effect of squirt flow in tight cracked rocks. The numerical results also reveal the main controlling factor of the squirt flow effect, which is consistent with the existing theoretical models for squirt flow in cracked porous rocks.
Key words:Digital rock/
Broadband dynamic stress-strain simulation/
Dispersion/
Attenuation/
Squirt flow
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