潜山花岗岩裂缝性储层阵列声波测井数值模拟研究

doi:10.11720/wtyht.2024.1252

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Abstract

The buried-hill reservoirs in the Qiongdongnan Basin of the South China Sea exhibit intricate reservoir spaces and numerous fractures, leading to their pronounced heterogeneity. Since granite sediments spread across the study area, it is critical to effectively evaluate the development of fractures in granite reservoirs. Based on the COMSOL Multiphysics software and the finite element method, this study simulated the use of array acoustic logging to detect granite reservoirs with different widths, dip angles, and lengths, summarizing the response characteristics of fractures in different development states. The results are as follows: (1) Shear waves in fractured formations are subjected to non-significant influence of fracture widths, and their attenuation is inversely proportional to fracture dip angles and directly proportional to fracture lengths; (2) Stoneley waves manifest significant response to the changes in fracture widths, dip angles, and lengths, and their attenuation is proportional to both fracture widths and dip angles; (3) The attenuation of Stoneley waves is directly proportional to fracture lengths below 0.1 m but shows subtle response to fracture lengths above 0.1 m. The results of this study provide a basis for determining the development state of fractures in granite reservoirs using the array acoustic log method.

Key words： array acoustic log granite reservoir numerical simulation buried hill fracture

Received: 15 June 2023 Published: 16 April 2024

ZTFLH:

P631

Corresponding Authors: ZHANG Chong E-mail: 1079396023@qq.com;yzlogging@163.com

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	Articles by authors
	Wei-Yi DU
	Chong ZHANG
	Hua-Yang HAN
	Teng-Teng ZHAO
	Wen-Yi ZHANG

Cite this article:

Wei-Yi DU,Chong ZHANG,Hua-Yang HAN, et al. A numerical simulation study on array acoustic logging of fractured granite reservoirs in buried hills[J]. Geophysical and Geochemical Exploration, 2024, 48(2): 514-520.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1252 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I2/514

Schematic diagram of crack-containing model

Material parameters of the model

Waveform diagram of model with cracks

Relationship between crack width and sound pressure attenuation

Relationship between crack inclination and sound pressure

Relationship between crack length and sound pressure attenuation

Relationship between crack width and stoneley wave attenuation

Relationship between crack inclination and transverse and Stoneleigh waves

Relationship between crack length (<0.1m) and transverse and Stoney waves

Relationship between crack length (>0.1m) and transverse wave

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