含裂隙孔隙介质AVF规律研究

Fractures are good reservoirs and major migration pathways of oil and gas, which controls the permeability of d reservoirs and indirectly affect the production of reservoir. Therefore, it is important to identify fractured areas. In recent decades, AVO (Amplitude versus offset) interpretation technology has played a significant role in fracture prediction and fluid identification. With the increasing complexity of exploration targets, the character of amplitude and elastic parameters abnormality is not obvious. Therefore, traditional AVO technology may no longer satisfy the demands of seismic exploration. In fluid saturated porous rocks, dispersion and attenuation usually accompany with the propagation of seismic wave. However, dispersion and attenuation are ignored in traditional AVO theory. Thus, frequency-dependent AVO technology has become the focused and hot point of seismic exploration. Based on Brajanovski model, this project will focus on the study of seismic wave dispersion, attenuation and anisotropy characters caused by wave-induced fluid flow between pores and fractures. Moreover, a theoretic calculation for AVF (Amplitude versus frequency) response and a method for frequency-dependent AVO inversion will be investigated. The frequency-dependent variations could provide insight for frequency-dependent AVO analysis and also would perfect and develop the traditional AVO interpretation techniques.

裂缝是油气的储集空间和运移通道，决定了储层的渗透率，间接影响着储层的产能，有效识别和描述储层裂隙区域对油气藏勘探和开发至关重要。近几十年来，AVO(Amplitude versus offset)解释技术在裂缝预测和流体识别中发挥了重要作用，流体饱和孔隙介质中常常伴随有地震波的频散和衰减特性，而传统AVO理论忽略了这一特性。因此，随着勘探目标体复杂程度的加深，反射振幅以及弹性参数异常特征不明显，传统理论无法满足勘探需求，频变AVO技术逐渐成为地球物理勘探的研究重点和热点。本课题基于Brajanovski模型，研究裂隙和孔隙间波导流体流动引起的地震波的速度频散、衰减及各向异性特性，探索AVF(Amplitude versus frequency)响应的理论计算和频散程度反演方法，期望能丰富并完善频变AVO分析理论，进一步提高储层识别及流体预测的精度，为我国含裂隙储层勘探和开发提供新思路。

裂缝是油气的储集空间和运移通道，决定了储层的渗透率，间接影响着储层的产能，有效识别和描述储层裂隙区域对油气藏勘探和开发至关重要。近几十年来，AVO(Amplitude versus offset)解释技术在裂缝预测和流体识别中发挥了重要作用，流体饱和孔隙介质中常常伴随有地震波的频散和衰减特性，而传统AVO理论忽略了这一特性。因此，随着勘探目标体复杂程度的加深，反射振幅以及弹性参数异常特征不明显，传统理论无法满足勘探需求，频变AVO技术逐渐成为地球物理勘探的研究重点和热点。本课题基于Brajanovski模型，研究裂隙和孔隙间波导流体流动引起的地震波的速度频散、衰减及各向异性特性，探索AVF(Amplitude versus frequency)响应的理论计算和频散程度反演方法，期望能丰富并完善频变AVO分析理论，进一步提高储层识别及流体预测的精度，为我国含裂隙储层勘探和开发提供新思路。