Warta Geologi, Volume 45, No. 2, June 2019, pp 40-42





Description

Correlation of seismic velocity and mechanical properties of metasandstone from CTW-1 well, Seri Iskandar, Perak, Malaysia

Norsyafiqah Salimun*, Abdul Ghani Rafek, Khairul Arifin Mohd. Noh

Department of Petroleum Geosciences, Universiti Teknologi PETRONAS (UTP),
Bandar Seri Iskandar, 32610, Perak, Malaysia
*Corresponding author email address: norsyafiqahsalimun@gmail.com

Abstract: Laboratory rock testing offers an alternative for estimation of rock mass properties through correlation of P-wave velocity and rock strength parameters for preliminary investigation in engineering geology. However, limited studies have been conducted on sedimentary rocks; e.g., sandstones and limestone in the Peninsular Malaysia. In this study, two laboratory tests using 18 metasandstone core samples obtained from CTW-1 well have been conducted to determine the correlation between P-wave velocities and uniaxial compressive strength (UCS). Measurements were conducted using ultrasonic wave pulse transmission and Schmidt rebound hammer. Rock Quality Designation (RQD) of core samples was also correlated with the P-wave velocity obtained from well log data. Four correlations were established from the results as follows; i) RQD = 99.772 (Q) + 0.2351, ii) RQD = 0.0151(Vp) + 20.353, iii) UCS = 0.0472Vp – 144.12 and iv) UCS = 0.064Vs – 72.31 with regression value of 0.99, 0.87, 0.93 and 0.78 respectively. The findings show good to acceptable correlations between P-wave velocities and UCS, RQD and velocity index, Q of the rock mass. These correlations serve as an alternative for estimating rock materials and rock mass parameters, based on the P-wave velocities and velocity index, Q. Similar correlations can be established for other rock types.

Keywords: Seismic velocity, mechanical properties, metasandstone

DOI : https://doi.org/10.7186/wg452201902