Detection of 3D formation structures based on electro-magnetic coupling measurements

摘要

The present disclosure relates to a method to determine a characteristic of a subsurface formation using electromagnetic coupling components. A downhole logging tool having one or more transmitters and one or more receivers, and being capable of measuring the electromagnetic coupling components is provided. The electromagnetic coupling components are measured using the downhole logging tool and used to form a 3-D Lateral Indicator and/or a 3-D Longitudinal Indicator. The 3-D Lateral Indicator and/or the 3-D Longitudinal Indicator are used to determine the characteristic of the subsurface formation.

主权项

1. A method to determine a characteristic of a subsurface formation using electromagnetic coupling components, comprising:
providing a downhole logging tool having one or more transmitters and one or more receivers, and being capable of measuring the electromagnetic coupling components; measuring the electromagnetic coupling components using the downhole logging tool; forming a 3-D Lateral Indicator and a 3-D Longitudinal Indicator using the electromagnetic coupling components, wherein the 3-D Longitudinal Indicator indicates whether a change in lateral resistivity remains unchanged when the logging tool is effectively rotated around an axis normal to a longitudinal tool axis by 180 degrees; and using the 3-D Lateral Indicator and/or the 3-D Longitudinal Indicator to determine the characteristic of the subsurface formation.