考虑软矿物纵横比的页岩岩石物理建模及其应用

doi:10.11720/wtyht.2024.2567

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Abstract

Previous petrophysical modeling of shale reservoirs often ignored the influence of pore types and soft-mineral aspect ratios on the elastic modulus.This study built a petrophysical model for transversely isotropic shales considering pore types and shapes,and soft-mineral aspect ratios.In this study,solid minerals were divided into hard and soft minerals,and soft minerals'anisotropic characteristics and shape changes were considered.According to the actual conditions of reservoirs, pores were categorized into intragranular,organic,and intergranular pores,and they were classified into stiff and soft pores based on their shapes.Finally,the input parameters were inverted using the particle swarm optimization algorithm to further calculate compressional and shear wave velocities,anisotropy parameters,and rock mechanical parameters.Combined with the actual data application,the results of this study were compared with the known results of shear wave velocity and isotropic rock mechanical calculation,suggesting that the model in this study is effective.

Key words： soft-mineral aspect ratio pore aspect ratio transverse isotropy petrophysical model shale shear-wave velocity prediction

Received: 25 November 2022 Published: 26 February 2024

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	Articles by authors
	Qi-Yu YANG
	Jing-Ye LI
	Fan WU
	Wen-Jin LI
	Jin-Ming CUI

Cite this article:

Qi-Yu YANG,Jing-Ye LI,Fan WU, et al. A petrophysical model of shales considering soft-mineral aspect ratios and its application[J]. Geophysical and Geochemical Exploration, 2024, 48(1): 98-104.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.2567 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I1/98

Well logging curve

Flow chart of petrophysical modeling

Elastic modulus of each component^[21-22]

Effect of single hole and three kinds of hole on velocity

Influence of different pore ratio on velocity

Influence of soft pore ratio on velocity

Influence of soft pore ratio on Thomsen anisotropy parameters

Influence of soft mineral aspect ratio on velocity

Influence of soft mineral aspect ratio on Thomsen anisotropy parameters

Inversion flow of petrophysical parameters

Inversion curve and velocity curve obtained by the model

Anisotropy parameter and rock mechanics parameter calculation results

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