Integrating MDT, NMR log and conventional logs for one-well evaluation

Abstract

This paper presents a case study for one-well evaluation integrating MDT, NMR logs and conventional logs. MDT, NMR logs and conventional logs provide formation permeability in different ways though the parameter can be derived in the three kinds of data. Integrating the three kinds of data and comparing the change trends among the data, the heterogeneity of reservoir and tiger interlayer are analyzed in this research. Furthermore, the characters of heavy oil in MDT data, CMR log and conventional logs are also compared in the research. On the profile of water–oil–water in the well XX-3-4, the characters between oil–water separator and oil–water transition are studied in terms of the data. T 2 cutoff, the key constant to determine permeability, is obtained when the core laboratory data is set to be the ruler. Our research conducted in the paper suggests CMR log can describe reservoir with more details duo to its high resolutions, but bad borehole wall and viscous oil may limit CMR log. Since MDT derived permeability shows good response to fluid flow on the condition of reservoir, the parameter plays an important role in oil and gas development.