Method and device for measuring stratigraphic dip by resistivity device with tilt coil

Abstract

The invention discloses a method and a device for measuring a stratigraphic dip by a resistivity device with a tilt coil. The method comprises the following steps: a first magnetic moment and a second magnetic moment are acquired; a first phase difference P1 and a first amplitude ratio A1 are computed; a second phase difference P2 and a second amplitude ratio A2 are computed; a third phase difference P and a third amplitude ratio A are acquired; resistivity R is computed according to P and A; the corresponding relation between R and an azimuth angle of the resistivity device is acquired; and the current stratigraphic dip corresponding to the azimuth angle is determined according to R and the corresponding relation. According to the method and the device disclosed by the invention, because the corresponding relation between the azimuth angle and the resistivity is acquired, an azimuth angle corresponding to an extremum resistivity can be obtained, and the current stratigraphic dip can be obtained according to the azimuth angle corresponding to the extremum resistivity, i.e. the stratigraphic dip is measured without the need of other devices, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of surveying, in particular to a method and device for measuring formation inclination angles through resistivity equipment with inclined coils. Background technique [0002] The electromagnetic wave propagation resistivity device is one of the most basic and important devices in logging while drilling. The electromagnetic wave propagation resistivity device without inclined coils measures conventional formation information without azimuth. The geosteering of this device The function is realized according to the polarization angle phenomenon of the resistivity response when the device is close to the formation boundary, but because there is no orientation, the polarization angle of the same direction appears when the equipment is close to the upper boundary or the lower boundary of the oil layer, so it can only be judged Whether it is close to the boundary, it is impossible to distinguish whether it is an upper bounda...

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Problems solved by technology

[0004] The present invention provides a method and device for measuring formation dip angle through resistivity equipment with inclined coils, so as to at least solve the problem that the current formation dip angle cannot be measured by electromagnetic wave propagation resistivity devices with inclined coils in the prior art

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