Experimental Investigating of Compaction Effect on Porosity Measurement for Carbonate Rocks

Abstract

Oil and natural gas may be found in commercial reservoirs, porous and easily permeable rocks. Porosity is an essential characteristic of reservoirs. This research focuses on comparing laboratory-measured porosity to log porosity. A comparison of the porosity values determined in the lab using the liquid saturation technique, density method, an ultrasonic method, and the porosity computed from wireline logs such as sonic, density, and neutron logs. Compaction is the decrease in volume caused by an external force. A discrepancy exists between the laboratory and log porosities because of the rock compaction. It is important to note that porosity may be broken down into two categories: total and effective. After calculating the bulk and grain volumes, the total porosity is determined by averaging the results of several techniques, such as gas density logs, density logs, and neutron logs. The porosity is estimated using ultrasonic equipment in the lab and compared to sonic logs. Sonic tests show a higher porosity in the lab than in the log due to the formation's rocks being compacted. An excellent correlation exists between density log porosity and density porosity from the lab, with a determination coefficient of 0.79.