Abstract
Despite the application of numerous geophysical methods in interpreting lithology, only a few are able to predict the mechanical properties of rocks correctly. It is also difficult to obtain data on mechanical rock properties for laboratory testing because it is expensive and requires full core drilling. Conversely, obtaining data of geophysical log is relatively easier because it is quite abundant due to the exploration in open hole and full core drilling. The mechanical properties will be very helpful for analysis, assuming it is easily determined by the geophysical approach. This research aims to model the relationship between mechanical properties and geophysical log data. Data on short density and gamma-ray were collected from laboratory testing known as ASTM and by measuring the boreholes. The data collected were then analyzed to determine the cohesion and friction angle. Specific analysis was carried out on clastic sedimentary rocks with low mechanical properties. The clastic sedimentary rocks are composed of mostly fine-grained to sand-sized quartz minerals. The analysis method was used to determine the relationship between the variables by performing simple linear regression. The result showed that geophysical log data's prediction model of mechanical properties produced an error of 19.71% to 56.14%. Furthermore, the mechanical properties and geophysical log data did not have a strong correlation. Therefore, it is recommended to conduct laboratory testing on the rock samples to determine their mechanical properties. This is possibly performed by multiplying samples with the same geological characteristics to produce a better distribution of data in statistical analysis.
Article highlights
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1.
The prediction mechanical properties of sedimentary rock can be determined with the geophysical method.
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The mechanical properties will be very helpful for analysis, assuming it is easily determined by the geophysical approach.
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Mechanical properties of fine-grained sedimentary rocks do not strongly correlate with the values of long spaced density (LSD), short spaced density (SSD), and gamma-ray.
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The author would like to thank the management of PT Borneo Indobara for supporting this research.
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Sujatono, S. Determination of cohesion and friction angle on sedimentary rock based on geophysical log. Geomech. Geophys. Geo-energ. Geo-resour. 8, 33 (2022). https://doi.org/10.1007/s40948-022-00343-z
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DOI: https://doi.org/10.1007/s40948-022-00343-z