Method for correcting NMR and nuclear logs in formate mud filtrate invaded formations

摘要

A method of calculating a porosity of a geological formation includes determining a bulk pore volume and a movable fluid pore volume in the geological formation in which drilling mud including a mud filtrate is introduced, calculating a porosity of the formation based on a bulk pore volume, and correcting the porosity based on the movable fluid volume in the geological formation.

主权项

1. A method of calculating a porosity of a geological formation, the method comprising:
determining, by a processor of a computing device, a bulk pore volume and a movable fluid pore volume in the geological formation in which drilling mud including a mud filtrate is introduced based on measurements by a data collection device in a borehole of the geological formation; calculating, by the processor of the computing device, a porosity of the geological formation based on the bulk pore volume; and correcting, by the processor of the computing device, the calculated porosity based on the movable fluid pore volume to take into account a difference in characteristics between the movable fluid pore volume and a bound fluid pore volume.