Rock anisotropy and brittleness from laboratory ultrasonic measurements in the service of hydraulic fracturing

Title:

Rock anisotropy and brittleness from laboratory ultrasonic measurements in the service of hydraulic fracturing

Creator:

Moska, Rafal, Kasza, Piotr, and Maslowski, Mateusz

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:3aad2f6f-80ad-45f5-ad76-b86ee11d69f0
uuid:3aad2f6f-80ad-45f5-ad76-b86ee11d69f0
issn:1214-9705
doi:10.13168/AGG.2018.0005

Subject:

geodynamika, geomechanika, geofyzika, geologie, ultrasonografie, měření, geodynamics, geomechanics, geophysics, geology, index lámavosti, ultrasonic laboratory measurements, elastic anisotropy, brittleness index, 7, and 551

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

Ultrasonic velocity anisotropy in the rock provides information of variability of the dynamic elastic moduli. Young’s modulus and Poisson’s ratio calculated from waves velocities can be used to determine brittleness index, which is usually used to predict rock susceptibility for hydraulic fracturing. This paper describes laboratory ultrasonic measurements carried out in order to improve hydraulic fracturing designing. The research was conducted over two types of rock: shale and limestone. The samples were cut out perpendicularly and parallel to the bedding planes. Next they were tested for effective porosity and mineral composition using XRD method. Directionally depended seismic velocities revealed noticeable anisotropy of laminated shale, caused by orientation of the bedding planes and weak anisotropy of limestone. Based on the velocities, dynamic elastic moduli and its anisotropy coefficients were determined. Calculations of brittleness index based on Young’s modulus to Poisson’s ratio relation and three types of mineral composition brittleness indexes, revealed strong variability in brittleness for both kind of tested formations. These results show, that different types of brittleness indexes should be used complementary, to better describe fracability of the rock. and Moska Rafal, Kasza Piotr, Maslowski Mateusz.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Source:

Acta geodynamica et geomaterialia : | 2018 Volume:15 | Number:1 (189)

Harvested from:

CDK

Metadata only:

false