裂隙连通性对含流体介质剪切波分裂特征的影响

doi:10.11720/wtyht.2019.1417

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Abstract

The underground medium is affected by multi-stage tectonic movement,the phenomenon that the crack exists in multiple groups is common,and the connectivity between multiple sets of fractures will affect the elastic parameters of the medium.When the elastic modulus of a saturated rock with two sets of staggered fractures are calculated,in the case where the fracture is connected,the elastic parameters of the dry rock are calculated first,and then the elastic parameters of the fluid-containing fracture medium are obtained by anisotropic fluid replacement.In the case of non-intersecting fractures,first the saturated crack toughness is calculated for the two sets of fractures,and then the overall elastic parameters of the saturated fractured rock are calculated.Some conclusions have been reached:①Under oil-water saturation conditions,when the fractures are connected,the shear-wave splitting parameters change less with the increase of oil saturation;when the fracture is not connected,the shear wave splitting parameter changes greatly with the increase of oil saturation.②As the crack inclination angle θ increases,the shear wave splitting parameter decreases.③Under oil saturation conditions,shear wave splitting parameters increase slightly with increasing porosity when the fractures are connected;when the fracture is not connected,the shear wave splitting parameter decreases with the increase of porosity,and the degree of reduction is relatively large.

Key words： fracture media fluid substitution anisotropy fracture connectivity shear-wave splitting

Received: 28 November 2018 Published: 15 August 2019

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	Articles by authors
	Jie TANG
	Cong LI
	Lei WEN
	Rui-Xuan QI

Cite this article:

Jie TANG,Cong LI,Lei WEN, et al. A study of influence of fracture connectivity on wave propagation characteristics[J]. Geophysical and Geochemical Exploration, 2019, 43(4): 859-865.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1417 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I4/859

Diagram of the model
a—connected fractures;b—disconnected fractures

Oil saturation condition
a—P-wave velocity in connected fracture media;b—P-wave velocity in disconnected fracture media;c—shear wave splitting parameters in connected fracture media;d—shear wave splitting parameters in disconnected fracture media

The variation of shear wave splitting parameters with oil saturation and θ under oil-water saturation
a、c—connected fractures;b、d—disconnected fractures

The variation of shear wave splitting parameters with gas saturation and θ under gas-water saturation
a、c—connected fractures;b、d—disconnected fractures

The variation of shear wave splitting parameters with porosity and θ under oil saturation
a—connected fractures;b—disconnected fractures

The variation of shear wave splitting parameters with oil saturation and the relationship between fracture parameters Z_N and Z_T under oil-water saturation
a—connected fracture media;b—disconnected fracture media

The variation of shear wave splitting parameters with porosity and fracture parameters Z_N and Z_T under oil saturation
a—connected fracture media;b—disconnected fracture media

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