摘要
上地幔中广泛存在低速高导层,对这些低速高导层成因的研究可以帮助我们了解上地幔物质的组成、分布以及地幔动力学过程.目前,地球科学家把上地幔低速高导层的主要成因归结为水或熔体的作用.本文主要介绍了水和熔体在上地幔中的赋存状况、对地震波速的衰减作用以及对电导率的影响.最后本文评述了含水模型和含熔体模型,并对电导率研究进行了展望.
The study of qP-wave reflectivity for titled fracture media has directive significance to predict the fractural reservoir.This paper derives PP-wave reflection coefficient in fracture equivalent TTI media referring to Hudson＇s theory.This formula intuitively built the relationship between reflection coefficient and fracture parameters including fracture density,filling and dip.On the basis of this formula,this paper analyzes PP-wave reflection coefficient sensitivities with filling and fracture density and summarizes the change of PP-wave reflection coefficient with fracture dip.Results show that the difference between PP-wave reflection coefficient of dry fracture and that of unfractured reservoir is strong including gradient and intercept of reflection coefficient,and it is inversely proportional to the fracture dip.However,there is little change in reflection coefficient of water-filled fracture.Meanwhile fracture density is also affected by fracture dip.The bigger the fracture density,the more PP-wave reflection coefficient of fracture media versus with the fracture dip will alter.
出处
《地球物理学进展》
CSCD
北大核心
2012年第5期1970-1980,共11页
Progress in Geophysics
基金
中国自然科学基金项目(40874040)
中国科学院创新性方向项目(KZCX2-EW-118)联合资助
关键词
水
熔体
低速高导层
上地幔
anisotropy
TTI media
seismic wave propagation
Zoeppritz equation
reflection characteristics
