A method and device for removing reflected waves from formation interfaces

Abstract

The embodiment of the present application discloses a method and a device for removing reflected waves from formation interfaces. The method provides dipole shear wave data at a designated drilling position in a purposeful work area; the method includes: determining the dipole shear wave time difference corresponding to the dipole shear wave data; performing vertical median filtering on the dipole shear wave data, Obtaining the dipole shear wave direct wave data at the designated drilling position; determining the initial dipole shear wave reflected wave data at the designated drilling position according to the dipole shear wave direct wave data; based on the dipole shear wave time difference, the The initial dipole shear wave reflected wave data is subjected to tilt median filtering to remove the formation interface reflected wave data at the specified drilling position. The technical solution provided by the application can realize the effective removal of the reflected wave of the formation interface.

Description

technical field [0001] The present application relates to the technical field of oil and gas exploration in complex lithology reservoirs, in particular to a method and device for removing reflection waves from formation interfaces. Background technique [0002] Complex lithology reservoirs have strong heterogeneity and anisotropy. At present, conventional logging series and micro-resistivity imaging logging series can only accurately evaluate the development of reservoirs within two meters around the well. Poor does not necessarily mean that the well-developed reservoir is poor. However, the dipole shear wave remote detection technology can reflect the abnormal acoustic impedance of formations or fractures and caves in the range of 3m-30m beside the well, so that the fractures and caves existing in the periphery of the wellbore can be effectively found, and the shortcomings of the drilling well location design and production plan can be solved. Provide a scientific basis. ...

AI Technical Summary

Problems solved by technology

So far, scholars at home and abroad have mainly focused on suppressing the borehole direct wave for the extraction of shear wave reflections, such as using F-K filtering to filter out the borehole direct wave signal, but less research has been done on the elimination of formation interface reflection waves

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