珊瑚礁多频超声波传播机理及其复杂多孔隙声学响应特征研究

The shortage of oil and gas resources is a major problem facing all countries in the world. Marine oil and gas resources have gradually becoming a new field of global oil and gas resources. The pore space characteristics of coral reefs, as oil and gas reservoir space, have become the key to oil and gas stratigraphic division and reservoir evaluation. However, the difficulty of recognizing and interpreting the complex pores in the periphery of coral reef boreholes has become the bottleneck of oil and gas stratigraphic division and reservoir evaluation. In this project, the complex pores coral reefs are taken as the research object, and the acoustic propagation mechanism of multi-frequency ultrasound and the acoustic response characteristics of complex pores coral reefs are studied by combining theoretical analysis, numerical simulation and experimental research. Specific contents include: considering the relaxation characteristics of coral reef skeleton, combining with the actual pore space characteristics of coral reefs, the wave equation of complex pores coral reefs is established; considering the pore response characteristics under the combined action of multi-frequency ultrasound, the multi-frequency ultrasonic propagation model is established; through a large number of numerical simulation and laboratory experiments, the acoustic propagation law of multi-frequency ultrasound is revealed; Based on the response characteristics, an inversion method for pore structure of coral reefs is proposed. This project aims to develop and improve the theory and method of acoustic propagation model of coral reefs, and lay a theoretical and technical foundation for acoustic logging and pore structure identification of coral reefs.

油气资源短缺是世界各国面临的重大难题，海洋油气资源逐渐成为全球油气资源开发的新领域，作为油气储集空间的珊瑚礁孔隙空间特征俨然成为了油气地层划分及储层评价的关键所在。然而，珊瑚礁钻孔井壁外围的复杂多孔隙识别和解译困难成为了油气地层划分及储层评价准确性的制约瓶颈。本项目以复杂多孔隙珊瑚礁作为研究对象，采用理论分析、数值模拟和实验研究相结合的方式，开展珊瑚礁多频超声波的声学传播机理及其复杂多孔隙声学响应特征研究。具体内容包括：考虑珊瑚礁礁体骨架的松弛特征，结合珊瑚礁实际孔隙空间特征，建立复杂多孔隙珊瑚礁的波动方程；考虑多种频率超声波共同作用下的孔隙响应特征，建立多频超声波传播模型；通过大量的数值模拟及室内实验，揭示多频超声波的声学传播规律及响应特征，构建基于多频超声波的珊瑚礁孔隙结构反演方法。本项目旨在发展和完善珊瑚礁声学传播模型研究的理论和方法，为珊瑚礁声波测井和孔隙结构识别奠定理论和技术基础

为响应国家“提高海洋资源开发能力，维护国家海洋权益，建设海洋强国”的战略部署，加快岛礁工程建设与海洋资源开发迫在眉睫。珊瑚礁钻孔井壁外围的复杂多孔隙识别和解译困难成为了油气地层划分及储层评价准确性的制约瓶颈。本项目以复杂多孔隙珊瑚礁作为研究对象，采用理论分析、数值模拟和实验研究相结合的方式，在考虑珊瑚礁礁体骨架的松弛特征和结合珊瑚礁实际孔隙空间特征的基础上，建立了复杂多孔隙珊瑚礁的波动方程；在考虑多种频率超声波共同作用下孔隙响应特征的基础上，建立了多频超声波传播模型；通过大量的数值模拟及室内实验，揭示了多频超声波的声学传播规律及响应特征，构建了基于多频超声波的珊瑚礁孔隙结构反演方法。此研究为进一步研究和发展珊瑚礁声波测井和孔隙结构识别提供了理论依据和技术基础。