DMR technique improves tight gas porosity estimate

An empirical method, designated as DMR (density-magnetic resonance) porosity, combines density and nuclear magnetic resonance porosities to improve the estimate of tight gas sand porosity.The DMR porosity method is an easy and robust tool for gas-corrected porosity because it depends on a mathematical derivation. It combines two tools’ responses in one simple transform.DMR porosities match core porosities better because unknowns such as fluid density (RHOF) and hydrogen index for gas (HIg) are both eliminated in the DMRP transform.NMR porosity in combination with density is a good tool for gas-corrected total porosity calculations and is independent of facies.Formation evaluationThe...

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